[ { "sku": "31316", "brand": "SKF", "manufacturer_designation": "SKF 31316", "series": "31300-series", "type": "tapered_roller", "d_mm": 80, "D_mm": 170, "B_mm": 42.5, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 276, "static_load_kN": 265, "fatigue_load_limit_kN": 30.5, "max_rpm": 4000, "reference_speed_rpm": 3000, "limiting_speed_rpm": 4000, "weight_g": 4050, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 31316 appears as SKF 31316: an open, single-row tapered roller bearing in the steep-angle heavy section of the 31300 dimension series, supplied with a pressed-steel cage as standard.The code breaks down as type prefix 3 (tapered roller), series 13 (the steep-angle heavy section), and bore code 16 = 80 mm; dimensions 80×170×42.5 mm therefore match the ISO 355 envelope. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. The 45.0 mm radial section height ((170−80)/2) and 4050 g catalogue mass frame a 80 mm bore bearing rated at 276 kN C — roughly 3.45 kN of dynamic capacity per millimetre of bore before application factors. Because the contact line is tapered, one 31316 reacts thrust in a single direction; bidirectional shafts need an O or X pair, and a rotating cone on a 80 mm shaft typically takes a k5 seat with an H7 housing bore.", "applications": [ "rolling-mill auxiliary drives", "crane sheave and hoist gearboxes", "paper-machine and printing rolls", "construction machinery drives" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting", "uneven load sharing in a pair when spacer faces are not parallel to the bore", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "hard-particle indentation of the tapered raceway in unfiltered oil" ], "pitfalls": [ "Mount the 80 mm bore 31316 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 313 series at 80 mm bore (170×42.5 mm) has a steeper contact angle than the 302/303 families — higher axial capacity per radial load but more induced thrust and heat; do not interchange with a 30316 without re-running the pair calculation.", "When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 31316 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.", "The tapered contact angle creates an induced axial load under pure radial force; include it in the 31316 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.", "The 4050 g mass and 42.5 mm width mean spacer and abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the contact angle and concentrates load on one rib of 31316.", "The 276/265 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 31316 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 31316 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 31316?", "a": "The SKF 31316 is a single-row tapered roller bearing with 80 mm bore, 170 mm outer diameter and 42.5 mm width (3.15 × 6.693 × 1.673 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 276 kN, C0 265 kN, fatigue load limit Pu 30.5 kN, reference speed 3,000 r/min, limiting speed 4,000 r/min, mass about 4050 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 31316 bore code work?", "a": "The last two digits of 31316 are bore code 16, so 16 × 5 = 80 mm bore. The 170 mm OD and 42.5 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 31316 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 13 is the ISO 355 series (steep-angle heavy section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 31316 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 31316 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 31316 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "31316", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "31316" ], "locale_variants": {} }, { "sku": "31317", "brand": "SKF", "manufacturer_designation": "SKF 31317", "series": "31300-series", "type": "tapered_roller", "d_mm": 85, "D_mm": 180, "B_mm": 44.5, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 297, "static_load_kN": 285, "fatigue_load_limit_kN": 32, "max_rpm": 3800, "reference_speed_rpm": 2800, "limiting_speed_rpm": 3800, "weight_g": 4600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "SKF 31317 belongs to the SKF single-row tapered roller range — the 85 mm bore entry in the 31300 series, dimensioned 180 mm OD and 44.5 mm wide to the ISO 355 boundary plan.Reading the designation: the leading 3 marks a single-row tapered roller bearing, the 13 is the ISO 355 diameter/width series (steep-angle heavy section), and the last two digits encode the 85 mm bore; the 180 mm OD and 44.5 mm width follow the ISO 355 general plan. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. Catalogue mass 4600 g for the 85×180×44.5 mm open execution covers the pressed-steel cage and standard roller complement; sealed or special-clearance variants differ slightly in mass and carry their own order numbers. For a 85 mm shaft the usual cone seat is k5 with an H7 housing when the inner ring rotates; arrange two 31317 bearings as a set for two-direction location and set clearance from the load diagram, never from assembly feel.", "applications": [ "paper-machine and printing rolls", "construction machinery drives", "marine deck machinery shafts", "heavy industrial gearboxes and speed reducers" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "false brinelling on idle paired sets exposed to machine vibration", "roller large-end smearing against the cone rib after EP lubricant film failure", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Mount the 85 mm bore 31317 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 313 series at 85 mm bore (180×44.5 mm) has a steeper contact angle than the 302/303 families — higher axial capacity per radial load but more induced thrust and heat; do not interchange with a 30317 without re-running the pair calculation.", "Do not mix brands or executions inside one 31317 pair — matched sets are ground for a specific setting, and pairing a SKF basic unit with a different suffix variant will not share the setting evenly.", "Setting is a design value, not an assembly feel: excessive preload in the 31317 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.", "Open 31317 units need application-supplied sealing and a defined EP lubricant supply; the roller-rib contact is the first to fail when the additive film breaks down.", "The 297/285 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 31317 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 31317 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 31317?", "a": "The SKF 31317 is a single-row tapered roller bearing with 85 mm bore, 180 mm outer diameter and 44.5 mm width (3.346 × 7.087 × 1.752 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 297 kN, C0 285 kN, fatigue load limit Pu 32 kN, reference speed 2,800 r/min, limiting speed 3,800 r/min, mass about 4600 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 31317 bore code work?", "a": "The last two digits of 31317 are bore code 17, so 17 × 5 = 85 mm bore. The 180 mm OD and 44.5 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 31317 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 13 is the ISO 355 series (steep-angle heavy section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 31317 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 31317 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 31317 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "31317", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "31317" ], "locale_variants": {} }, { "sku": "31318", "brand": "SKF", "manufacturer_designation": "SKF 31318", "series": "31300-series", "type": "tapered_roller", "d_mm": 90, "D_mm": 190, "B_mm": 46.5, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 283, "static_load_kN": 315, "fatigue_load_limit_kN": 35.5, "max_rpm": 3400, "reference_speed_rpm": 2400, "limiting_speed_rpm": 3400, "weight_g": 5400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "For a 90 mm shaft carrying combined load, SKF lists 31318 under catalogue execution SKF 31318: one open single-row tapered roller bearing in the steep-angle heavy section of the 31300 family.Digit by digit, 31318 reads as bearing type 3 (single-row tapered roller), steep-angle heavy section series 13, and bore reference 18 resolving to 90 mm; 190 mm OD and 46.5 mm width are the matching ISO 355 boundary values. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. At 2,400 r/min reference speed the 50.0 mm-section 31318 is governed thermally by preload and lubricant flow; grease or oil selection should be made against that value, with 3,400 r/min as the mechanical ceiling. Mounting practice for 31318: the rotating cone takes the interference fit (k5 on a 90 mm shaft), the cup slides for axial location, and reversing-thrust duty demands a paired O/X set rather than one bearing.", "applications": [ "marine deck machinery shafts", "heavy industrial gearboxes and speed reducers", "large process pump and compressor shafts", "rolling-mill auxiliary drives" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "axial overload spalling at the roller-rib contact beyond the single-row thrust rating", "preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount the 90 mm bore 31318 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 313 series at 90 mm bore (190×46.5 mm) has a steeper contact angle than the 302/303 families — higher axial capacity per radial load but more induced thrust and heat; do not interchange with a 30318 without re-running the pair calculation.", "O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 31318 mounting error.", "A single 31318 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use an O or X matched pair for bidirectional location.", "Shaft and housing fillets must clear the bearing chamfer so the 46.5 mm-wide cup seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 283/315 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 31318 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 31318 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 31318?", "a": "The SKF 31318 is a single-row tapered roller bearing with 90 mm bore, 190 mm outer diameter and 46.5 mm width (3.543 × 7.48 × 1.831 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 283 kN, C0 315 kN, fatigue load limit Pu 35.5 kN, reference speed 2,400 r/min, limiting speed 3,400 r/min, mass about 5400 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 31318 bore code work?", "a": "The last two digits of 31318 are bore code 18, so 18 × 5 = 90 mm bore. The 190 mm OD and 46.5 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 31318 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 13 is the ISO 355 series (steep-angle heavy section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 31318 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 31318 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 31318 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "31318", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "31318" ], "locale_variants": {} }, { "sku": "31319", "brand": "SKF", "manufacturer_designation": "SKF 31319", "series": "31300-series", "type": "tapered_roller", "d_mm": 95, "D_mm": 200, "B_mm": 49.5, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 314, "static_load_kN": 355, "fatigue_load_limit_kN": 39, "max_rpm": 3400, "reference_speed_rpm": 2400, "limiting_speed_rpm": 3400, "weight_g": 6300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "SKF 31319 (SKF 31319) is the steep-angle heavy section tapered roller choice for a 95 mm shaft — one row of tapered rollers on an asymmetric raceway inside the 200×49.5 mm ISO 355 envelope.Numbering ties the bearing to its envelope: 31319 means tapered-roller type 3, steep-angle heavy section series 13, 95 mm bore — which is why the 200×49.5 mm outline swaps dimensionally with other ISO 355 bearings of the same code. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. Speed planning uses two different ceilings: 2,400 r/min thermal reference and 3,400 r/min mechanical limiting speed. Fit selection follows the rotating ring — interference on a rotating cone — and two 31319 units are required to take reversing thrust; keep the induced axial load inside the rated capacity when calculating the pair.", "applications": [ "large process pump and compressor shafts", "rolling-mill auxiliary drives", "crane sheave and hoist gearboxes", "paper-machine and printing rolls" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "uneven load sharing in a pair when spacer faces are not parallel to the bore", "thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Mount the 95 mm bore 31319 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 313 series at 95 mm bore (200×49.5 mm) has a steeper contact angle than the 302/303 families — higher axial capacity per radial load but more induced thrust and heat; do not interchange with a 30319 without re-running the pair calculation.", "The tapered contact angle creates an induced axial load under pure radial force; include it in the 31319 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.", "At the 314 kN rating of 31319, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 3,400 r/min speed end and heavier preload only where moment stiffness dominates.", "Catalogue reference speed and limiting speed are different limits: the 2,400 r/min reference is a thermal criterion under load, while the 3,400 r/min limiting value is the mechanical ceiling — observe both.", "The 314/355 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 31319 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 31319 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 31319?", "a": "The SKF 31319 is a single-row tapered roller bearing with 95 mm bore, 200 mm outer diameter and 49.5 mm width (3.74 × 7.874 × 1.949 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 314 kN, C0 355 kN, fatigue load limit Pu 39 kN, reference speed 2,400 r/min, limiting speed 3,400 r/min, mass about 6300 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 31319 bore code work?", "a": "The last two digits of 31319 are bore code 19, so 19 × 5 = 95 mm bore. The 200 mm OD and 49.5 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 31319 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 13 is the ISO 355 series (steep-angle heavy section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 31319 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 31319 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 31319 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "31319", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "31319" ], "locale_variants": {} }, { "sku": "33010", "brand": "SKF", "manufacturer_designation": "SKF 33010", "series": "33000-series", "type": "tapered_roller", "d_mm": 50, "D_mm": 80, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 84.8, "static_load_kN": 102, "fatigue_load_limit_kN": 11.4, "max_rpm": 8000, "reference_speed_rpm": 6300, "limiting_speed_rpm": 8000, "weight_g": 450, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "33010 is a single-row tapered roller bearing in the ISO 33000 dimension series: a separable cone-and-cup design for combined radial and one-direction axial load, listed by SKF in SKF catalogue PUB BU/P1 17000.The code breaks down as type prefix 3 (tapered roller), series 30 (the slim light section), and bore code 10 = 50 mm; dimensions 50×80×24 mm therefore match the ISO 355 envelope. The SKF catalogue adds the ISO 355 dimension-series code after the bare number (e.g. 2CE); it is the dimensional series, not a separate part number. Speed planning uses two different ceilings: 6,300 r/min thermal reference and 8,000 r/min mechanical limiting speed. For a 50 mm shaft the usual cone seat is k5 with an H7 housing when the inner ring rotates; arrange two 33010 bearings as a set for two-direction location and set clearance from the load diagram, never from assembly feel.", "applications": [ "industrial gearbox shafts and reducers", "differential and pinion drives", "pump and compressor shafts", "machine-tool spindles" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways", "axial overload spalling at the roller-rib contact beyond the single-row thrust rating", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "grease degradation after long shelf storage without rotation or re-greasing" ], "pitfalls": [ "On this 50 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 33010 pair heats, loses setting control and smears the roller-rib contact.", "The 330 series at 50 mm bore (80×24 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 30210 of the same bore — confirm the L10 margin before downsizing into it.", "The tapered contact angle creates an induced axial load under pure radial force; include it in the 33010 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.", "At the 84.8 kN rating of 33010, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 8,000 r/min speed end and heavier preload only where moment stiffness dominates.", "The 450 g mass and 24 mm width mean spacer and abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the contact angle and concentrates load on one rib of 33010.", "The 84.8/102 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 33010 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 33010 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 33010?", "a": "The SKF 33010 is a single-row tapered roller bearing with 50 mm bore, 80 mm outer diameter and 24 mm width (1.969 × 3.15 × 0.945 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 84.8 kN, C0 102 kN, fatigue load limit Pu 11.4 kN, reference speed 6,300 r/min, limiting speed 8,000 r/min, mass about 450 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 33010 bore code work?", "a": "The last two digits of 33010 are bore code 10, so 10 × 5 = 50 mm bore. The 80 mm OD and 24 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 33010 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 30 is the ISO 355 series (slim light section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 33010 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 33010 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 33010 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "33010-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "33010", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "33010" ], "locale_variants": {} }, { "sku": "33011", "brand": "SKF", "manufacturer_designation": "SKF 33011", "series": "33000-series", "type": "tapered_roller", "d_mm": 55, "D_mm": 90, "B_mm": 27, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 111, "static_load_kN": 137, "fatigue_load_limit_kN": 15.3, "max_rpm": 7000, "reference_speed_rpm": 5600, "limiting_speed_rpm": 7000, "weight_g": 660, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "The SKF 33011 is a 55×90×27 mm single-row tapered roller bearing — the slim light section entry in the 33000 series, with an asymmetric raceway cut for thrust capacity and separable mounting.Reading the designation: the leading 3 marks a single-row tapered roller bearing, the 30 is the ISO 355 diameter/width series (slim light section), and the last two digits encode the 55 mm bore; the 90 mm OD and 27 mm width follow the ISO 355 general plan. The SKF catalogue adds the ISO 355 dimension-series code after the bare number (e.g. 2CE); it is the dimensional series, not a separate part number. With C 111 kN and C0 137 kN, the 33011 pair-sizing check is dominated by the axial share: keep the equivalent load P below the rating at the required L10, remembering one bearing alone cannot cover reversing thrust at 7,000 r/min. Mounting practice for 33011: the rotating cone takes the interference fit (k5 on a 55 mm shaft), the cup slides for axial location, and reversing-thrust duty demands a paired O/X set rather than one bearing.", "applications": [ "pump and compressor shafts", "machine-tool spindles", "belt-driven fan and blower shafts", "axle-boxes in material-handling equipment" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting", "uneven load sharing in a pair when spacer faces are not parallel to the bore", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "mounting score marks when the cone is cocked over the shaft keyway or a burr" ], "pitfalls": [ "On this 55 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 33011 pair heats, loses setting control and smears the roller-rib contact.", "The 330 series at 55 mm bore (90×27 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 30211 of the same bore — confirm the L10 margin before downsizing into it.", "Setting is a design value, not an assembly feel: excessive preload in the 33011 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.", "When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 33011 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.", "Open 33011 units need application-supplied sealing and a defined EP lubricant supply; the roller-rib contact is the first to fail when the additive film breaks down.", "The 111/137 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 33011 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 33011 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 33011?", "a": "The SKF 33011 is a single-row tapered roller bearing with 55 mm bore, 90 mm outer diameter and 27 mm width (2.165 × 3.543 × 1.063 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 111 kN, C0 137 kN, fatigue load limit Pu 15.3 kN, reference speed 5,600 r/min, limiting speed 7,000 r/min, mass about 660 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 33011 bore code work?", "a": "The last two digits of 33011 are bore code 11, so 11 × 5 = 55 mm bore. The 90 mm OD and 27 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 33011 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 30 is the ISO 355 series (slim light section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 33011 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 33011 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 33011 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "33011-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "33011", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "33011" ], "locale_variants": {} }, { "sku": "33012", "brand": "SKF", "manufacturer_designation": "SKF 33012", "series": "33000-series", "type": "tapered_roller", "d_mm": 60, "D_mm": 95, "B_mm": 27, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 113, "static_load_kN": 143, "fatigue_load_limit_kN": 16, "max_rpm": 6700, "reference_speed_rpm": 5300, "limiting_speed_rpm": 6700, "weight_g": 700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 33012 appears as SKF 33012: an open, single-row tapered roller bearing in the slim light section of the 33000 dimension series, supplied with a pressed-steel cage as standard.Digit by digit, 33012 reads as bearing type 3 (single-row tapered roller), slim light section series 30, and bore reference 12 resolving to 60 mm; 95 mm OD and 27 mm width are the matching ISO 355 boundary values. The SKF catalogue adds the ISO 355 dimension-series code after the bare number (e.g. 2CE); it is the dimensional series, not a separate part number. The 16 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.27 C0/C balance shows this execution is tuned to thrust-heavy combined loads rather than pure radial running. Fit selection follows the rotating ring — interference on a rotating cone — and two 33012 units are required to take reversing thrust; keep the induced axial load inside the rated capacity when calculating the pair.", "applications": [ "construction machinery drives", "marine deck machinery shafts", "heavy industrial gearboxes and speed reducers", "large process pump and compressor shafts" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "false brinelling on idle paired sets exposed to machine vibration", "roller large-end smearing against the cone rib after EP lubricant film failure", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "rib-roller contact scoring from loss of the EP additive film" ], "pitfalls": [ "Mount the 60 mm bore 33012 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 330 series at 60 mm bore (95×27 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 30212 of the same bore — confirm the L10 margin before downsizing into it.", "A single 33012 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use an O or X matched pair for bidirectional location.", "Do not mix brands or executions inside one 33012 pair — matched sets are ground for a specific setting, and pairing a SKF basic unit with a different suffix variant will not share the setting evenly.", "Shaft and housing fillets must clear the bearing chamfer so the 27 mm-wide cup seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 113/143 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 33012 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 33012 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 33012?", "a": "The SKF 33012 is a single-row tapered roller bearing with 60 mm bore, 95 mm outer diameter and 27 mm width (2.362 × 3.74 × 1.063 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 113 kN, C0 143 kN, fatigue load limit Pu 16 kN, reference speed 5,300 r/min, limiting speed 6,700 r/min, mass about 700 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 33012 bore code work?", "a": "The last two digits of 33012 are bore code 12, so 12 × 5 = 60 mm bore. The 95 mm OD and 27 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 33012 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 30 is the ISO 355 series (slim light section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 33012 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 33012 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 33012 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "33012-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "33012", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "33012" ], "locale_variants": {} }, { "sku": "33013", "brand": "SKF", "manufacturer_designation": "SKF 33013", "series": "33000-series", "type": "tapered_roller", "d_mm": 65, "D_mm": 100, "B_mm": 27, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 119, "static_load_kN": 153, "fatigue_load_limit_kN": 17.3, "max_rpm": 6300, "reference_speed_rpm": 5000, "limiting_speed_rpm": 6300, "weight_g": 750, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "SKF 33013 belongs to the SKF single-row tapered roller range — the 65 mm bore entry in the 33000 series, dimensioned 100 mm OD and 27 mm wide to the ISO 355 boundary plan.Numbering ties the bearing to its envelope: 33013 means tapered-roller type 3, slim light section series 30, 65 mm bore — which is why the 100×27 mm outline swaps dimensionally with other ISO 355 bearings of the same code. The SKF catalogue adds the ISO 355 dimension-series code after the bare number (e.g. 2CE); it is the dimensional series, not a separate part number. Selection arithmetic: the C0/C ratio is about 1.29 (static 153 kN against dynamic 119 kN), typical of a tapered roller sized for axial capacity, and the 17.3 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. A single 33013 locates the shaft in one axial direction only; mount it against a second bearing in O (back-to-back) or X (face-to-face) arrangement, and set the running clearance by the mounting procedure — not by feel.", "applications": [ "heavy industrial gearboxes and speed reducers", "large process pump and compressor shafts", "rolling-mill auxiliary drives", "crane sheave and hoist gearboxes" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "axial overload spalling at the roller-rib contact beyond the single-row thrust rating", "preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "hard-particle indentation of the tapered raceway in unfiltered oil" ], "pitfalls": [ "Mount the 65 mm bore 33013 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 330 series at 65 mm bore (100×27 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 30213 of the same bore — confirm the L10 margin before downsizing into it.", "At the 119 kN rating of 33013, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 6,300 r/min speed end and heavier preload only where moment stiffness dominates.", "O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 33013 mounting error.", "Catalogue reference speed and limiting speed are different limits: the 5,000 r/min reference is a thermal criterion under load, while the 6,300 r/min limiting value is the mechanical ceiling — observe both.", "The 119/153 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 33013 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 33013 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 33013?", "a": "The SKF 33013 is a single-row tapered roller bearing with 65 mm bore, 100 mm outer diameter and 27 mm width (2.559 × 3.937 × 1.063 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 119 kN, C0 153 kN, fatigue load limit Pu 17.3 kN, reference speed 5,000 r/min, limiting speed 6,300 r/min, mass about 750 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 33013 bore code work?", "a": "The last two digits of 33013 are bore code 13, so 13 × 5 = 65 mm bore. The 100 mm OD and 27 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 33013 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 30 is the ISO 355 series (slim light section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 33013 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 33013 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 33013 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "33013-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×100×27 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "33013", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "33013" ], "locale_variants": {} }, { "sku": "33014", "brand": "SKF", "manufacturer_designation": "SKF 33014", "series": "33000-series", "type": "tapered_roller", "d_mm": 70, "D_mm": 110, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 159, "static_load_kN": 196, "fatigue_load_limit_kN": 22.8, "max_rpm": 5600, "reference_speed_rpm": 4800, "limiting_speed_rpm": 5600, "weight_g": 1050, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "For a 70 mm shaft carrying combined load, SKF lists 33014 under catalogue execution SKF 33014: one open single-row tapered roller bearing in the slim light section of the 33000 family.On the SKF nameplate, 33014 follows the ISO 355 convention: 3 for the tapered-roller type, 30 for the slim light section, final digits 14 for the 70 mm bore. The SKF catalogue adds the ISO 355 dimension-series code after the bare number (e.g. 2CE); it is the dimensional series, not a separate part number. The 20.0 mm radial section height ((110−70)/2) and 1050 g catalogue mass frame a 70 mm bore bearing rated at 159 kN C — roughly 2.27 kN of dynamic capacity per millimetre of bore before application factors. Note the minimum-axial-load requirement: at light radial load and high speed the rollers of 33014 must still be held into the rib contact, which is another reason the catalogue recommends paired mounting with controlled setting.", "applications": [ "rolling-mill auxiliary drives", "crane sheave and hoist gearboxes", "paper-machine and printing rolls", "construction machinery drives" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "uneven load sharing in a pair when spacer faces are not parallel to the bore", "thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Mount the 70 mm bore 33014 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 330 series at 70 mm bore (110×31 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 30214 of the same bore — confirm the L10 margin before downsizing into it.", "When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 33014 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.", "The tapered contact angle creates an induced axial load under pure radial force; include it in the 33014 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.", "The 33014 shares its ISO 355 envelope with other tapered bearings of the same code but is not a drop-in replacement for a ball bearing: it cannot run effectively under pure radial load without a minimum axial load, and a deep-groove bearing cannot replace its combined-load duty.", "The 159/196 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 33014 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 33014 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 33014?", "a": "The SKF 33014 is a single-row tapered roller bearing with 70 mm bore, 110 mm outer diameter and 31 mm width (2.756 × 4.331 × 1.22 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 159 kN, C0 196 kN, fatigue load limit Pu 22.8 kN, reference speed 4,800 r/min, limiting speed 5,600 r/min, mass about 1050 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 33014 bore code work?", "a": "The last two digits of 33014 are bore code 14, so 14 × 5 = 70 mm bore. The 110 mm OD and 31 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 33014 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 30 is the ISO 355 series (slim light section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 33014 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 33014 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 33014 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "33014-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×110×31 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "33014", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "33014" ], "locale_variants": {} }, { "sku": "33015", "brand": "SKF", "manufacturer_designation": "SKF 33015", "series": "33000-series", "type": "tapered_roller", "d_mm": 75, "D_mm": 115, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 167, "static_load_kN": 228, "fatigue_load_limit_kN": 26, "max_rpm": 5300, "reference_speed_rpm": 4300, "limiting_speed_rpm": 5300, "weight_g": 1200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "SKF 33015 (SKF 33015) is the slim light section tapered roller choice for a 75 mm shaft — one row of tapered rollers on an asymmetric raceway inside the 115×31 mm ISO 355 envelope.The code breaks down as type prefix 3 (tapered roller), series 30 (the slim light section), and bore code 15 = 75 mm; dimensions 75×115×31 mm therefore match the ISO 355 envelope. The SKF catalogue adds the ISO 355 dimension-series code after the bare number (e.g. 2CE); it is the dimensional series, not a separate part number. Catalogue mass 1200 g for the 75×115×31 mm open execution covers the pressed-steel cage and standard roller complement; sealed or special-clearance variants differ slightly in mass and carry their own order numbers. Specify pairs rather than single units wherever thrust reverses: the tapered contact of 33015 generates an induced axial load under radial force, and an unpaired bearing on a reversing shaft will run slack and fret its seat.", "applications": [ "paper-machine and printing rolls", "construction machinery drives", "marine deck machinery shafts", "heavy industrial gearboxes and speed reducers" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "roller large-end smearing against the cone rib after EP lubricant film failure", "false brinelling on idle paired sets exposed to machine vibration", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount the 75 mm bore 33015 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 330 series at 75 mm bore (115×31 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 30215 of the same bore — confirm the L10 margin before downsizing into it.", "Do not mix brands or executions inside one 33015 pair — matched sets are ground for a specific setting, and pairing a SKF basic unit with a different suffix variant will not share the setting evenly.", "Setting is a design value, not an assembly feel: excessive preload in the 33015 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.", "Never press both rings through the wrong element during fitting: force for an interference shaft seat goes through the cone only, or brinell marks on the 115 mm cup race release as noise within the first running hours.", "The 167/228 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 33015 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 33015 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 33015?", "a": "The SKF 33015 is a single-row tapered roller bearing with 75 mm bore, 115 mm outer diameter and 31 mm width (2.953 × 4.528 × 1.22 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 167 kN, C0 228 kN, fatigue load limit Pu 26 kN, reference speed 4,300 r/min, limiting speed 5,300 r/min, mass about 1200 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 33015 bore code work?", "a": "The last two digits of 33015 are bore code 15, so 15 × 5 = 75 mm bore. The 115 mm OD and 31 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 33015 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 30 is the ISO 355 series (slim light section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 33015 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 33015 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 33015 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "33015", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "33015" ], "locale_variants": {} }, { "sku": "33016", "brand": "SKF", "manufacturer_designation": "SKF 33016", "series": "33000-series", "type": "tapered_roller", "d_mm": 80, "D_mm": 125, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 207, "static_load_kN": 285, "fatigue_load_limit_kN": 32, "max_rpm": 5000, "reference_speed_rpm": 4000, "limiting_speed_rpm": 5000, "weight_g": 1650, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "Ordering number SKF 33016 in SKF catalogue PUB BU/P1 17000 denotes a single-row tapered roller bearing for a 80 mm shaft, slim light section, with an open pressed-steel-cage execution and one-direction axial capacity.Reading the designation: the leading 3 marks a single-row tapered roller bearing, the 30 is the ISO 355 diameter/width series (slim light section), and the last two digits encode the 80 mm bore; the 125 mm OD and 36 mm width follow the ISO 355 general plan. The SKF catalogue adds the ISO 355 dimension-series code after the bare number (e.g. 2CE); it is the dimensional series, not a separate part number. At 4,000 r/min reference speed the 22.5 mm-section 33016 is governed thermally by preload and lubricant flow; grease or oil selection should be made against that value, with 5,000 r/min as the mechanical ceiling. Because the contact line is tapered, one 33016 reacts thrust in a single direction; bidirectional shafts need an O or X pair, and a rotating cone on a 80 mm shaft typically takes a k5 seat with an H7 housing bore.", "applications": [ "marine deck machinery shafts", "heavy industrial gearboxes and speed reducers", "large process pump and compressor shafts", "rolling-mill auxiliary drives" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways", "axial overload spalling at the roller-rib contact beyond the single-row thrust rating", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Mount the 80 mm bore 33016 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 330 series at 80 mm bore (125×36 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 30216 of the same bore — confirm the L10 margin before downsizing into it.", "O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 33016 mounting error.", "A single 33016 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use an O or X matched pair for bidirectional location.", "The pressed-steel cage is rated for standard industrial service; sustained running above the limiting speed or with degraded lubricant wears the cage pockets — inspect the cage at every relubrication interval.", "The 207/285 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 33016 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 33016 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 33016?", "a": "The SKF 33016 is a single-row tapered roller bearing with 80 mm bore, 125 mm outer diameter and 36 mm width (3.15 × 4.921 × 1.417 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 207 kN, C0 285 kN, fatigue load limit Pu 32 kN, reference speed 4,000 r/min, limiting speed 5,000 r/min, mass about 1650 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 33016 bore code work?", "a": "The last two digits of 33016 are bore code 16, so 16 × 5 = 80 mm bore. The 125 mm OD and 36 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 33016 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 30 is the ISO 355 series (slim light section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 33016 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 33016 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 33016 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "33016", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "33016" ], "locale_variants": {} }, { "sku": "33017", "brand": "SKF", "manufacturer_designation": "SKF 33017", "series": "33000-series", "type": "tapered_roller", "d_mm": 85, "D_mm": 130, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 223, "static_load_kN": 310, "fatigue_load_limit_kN": 34.5, "max_rpm": 4800, "reference_speed_rpm": 3800, "limiting_speed_rpm": 4800, "weight_g": 1750, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "33017 is a single-row tapered roller bearing in the ISO 33000 dimension series: a separable cone-and-cup design for combined radial and one-direction axial load, listed by SKF in SKF catalogue PUB BU/P1 17000.Digit by digit, 33017 reads as bearing type 3 (single-row tapered roller), slim light section series 30, and bore reference 17 resolving to 85 mm; 130 mm OD and 36 mm width are the matching ISO 355 boundary values. The SKF catalogue adds the ISO 355 dimension-series code after the bare number (e.g. 2CE); it is the dimensional series, not a separate part number. Speed planning uses two different ceilings: 3,800 r/min thermal reference and 4,800 r/min mechanical limiting speed. For a 85 mm shaft the usual cone seat is k5 with an H7 housing when the inner ring rotates; arrange two 33017 bearings as a set for two-direction location and set clearance from the load diagram, never from assembly feel.", "applications": [ "large process pump and compressor shafts", "rolling-mill auxiliary drives", "crane sheave and hoist gearboxes", "paper-machine and printing rolls" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting", "uneven load sharing in a pair when spacer faces are not parallel to the bore", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "brinelling from pressing the cone or cup home through the rollers" ], "pitfalls": [ "Mount the 85 mm bore 33017 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 330 series at 85 mm bore (130×36 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 30217 of the same bore — confirm the L10 margin before downsizing into it.", "The tapered contact angle creates an induced axial load under pure radial force; include it in the 33017 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.", "At the 223 kN rating of 33017, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 4,800 r/min speed end and heavier preload only where moment stiffness dominates.", "The 1750 g mass and 36 mm width mean spacer and abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the contact angle and concentrates load on one rib of 33017.", "The 223/310 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 33017 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 33017 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 33017?", "a": "The SKF 33017 is a single-row tapered roller bearing with 85 mm bore, 130 mm outer diameter and 36 mm width (3.346 × 5.118 × 1.417 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 223 kN, C0 310 kN, fatigue load limit Pu 34.5 kN, reference speed 3,800 r/min, limiting speed 4,800 r/min, mass about 1750 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 33017 bore code work?", "a": "The last two digits of 33017 are bore code 17, so 17 × 5 = 85 mm bore. The 130 mm OD and 36 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 33017 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 30 is the ISO 355 series (slim light section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 33017 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 33017 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 33017 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "33017", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "33017" ], "locale_variants": {} }, { "sku": "33018", "brand": "SKF", "manufacturer_designation": "SKF 33018", "series": "33000-series", "type": "tapered_roller", "d_mm": 90, "D_mm": 140, "B_mm": 39, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 266, "static_load_kN": 355, "fatigue_load_limit_kN": 39, "max_rpm": 4500, "reference_speed_rpm": 3600, "limiting_speed_rpm": 4500, "weight_g": 2200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "The SKF 33018 is a 90×140×39 mm single-row tapered roller bearing — the slim light section entry in the 33000 series, with an asymmetric raceway cut for thrust capacity and separable mounting.Numbering ties the bearing to its envelope: 33018 means tapered-roller type 3, slim light section series 30, 90 mm bore — which is why the 140×39 mm outline swaps dimensionally with other ISO 355 bearings of the same code. The SKF catalogue adds the ISO 355 dimension-series code after the bare number (e.g. 2CE); it is the dimensional series, not a separate part number. With C 266 kN and C0 355 kN, the 33018 pair-sizing check is dominated by the axial share: keep the equivalent load P below the rating at the required L10, remembering one bearing alone cannot cover reversing thrust at 4,500 r/min. Mounting practice for 33018: the rotating cone takes the interference fit (k5 on a 90 mm shaft), the cup slides for axial location, and reversing-thrust duty demands a paired O/X set rather than one bearing.", "applications": [ "crane sheave and hoist gearboxes", "paper-machine and printing rolls", "construction machinery drives", "marine deck machinery shafts" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "false brinelling on idle paired sets exposed to machine vibration", "roller large-end smearing against the cone rib after EP lubricant film failure", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount the 90 mm bore 33018 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 330 series at 90 mm bore (140×39 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 30218 of the same bore — confirm the L10 margin before downsizing into it.", "Setting is a design value, not an assembly feel: excessive preload in the 33018 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.", "When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 33018 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.", "Open 33018 units need application-supplied sealing and a defined EP lubricant supply; the roller-rib contact is the first to fail when the additive film breaks down.", "The 266/355 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 33018 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 33018 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 33018?", "a": "The SKF 33018 is a single-row tapered roller bearing with 90 mm bore, 140 mm outer diameter and 39 mm width (3.543 × 5.512 × 1.535 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 266 kN, C0 355 kN, fatigue load limit Pu 39 kN, reference speed 3,600 r/min, limiting speed 4,500 r/min, mass about 2200 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 33018 bore code work?", "a": "The last two digits of 33018 are bore code 18, so 18 × 5 = 90 mm bore. The 140 mm OD and 39 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 33018 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 30 is the ISO 355 series (slim light section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 33018 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 33018 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 33018 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "33018", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "33018" ], "locale_variants": {} }, { "sku": "33019", "brand": "SKF", "manufacturer_designation": "SKF 33019", "series": "33000-series", "type": "tapered_roller", "d_mm": 95, "D_mm": 145, "B_mm": 39, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 272, "static_load_kN": 375, "fatigue_load_limit_kN": 40.5, "max_rpm": 4300, "reference_speed_rpm": 3400, "limiting_speed_rpm": 4300, "weight_g": 2300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 33019 appears as SKF 33019: an open, single-row tapered roller bearing in the slim light section of the 33000 dimension series, supplied with a pressed-steel cage as standard.On the SKF nameplate, 33019 follows the ISO 355 convention: 3 for the tapered-roller type, 30 for the slim light section, final digits 19 for the 95 mm bore. The SKF catalogue adds the ISO 355 dimension-series code after the bare number (e.g. 2CE); it is the dimensional series, not a separate part number. The 40.5 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.38 C0/C balance shows this execution is tuned to thrust-heavy combined loads rather than pure radial running. Fit selection follows the rotating ring — interference on a rotating cone — and two 33019 units are required to take reversing thrust; keep the induced axial load inside the rated capacity when calculating the pair.", "applications": [ "construction machinery drives", "marine deck machinery shafts", "heavy industrial gearboxes and speed reducers", "large process pump and compressor shafts" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "axial overload spalling at the roller-rib contact beyond the single-row thrust rating", "preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "grease degradation after long shelf storage without rotation or re-greasing" ], "pitfalls": [ "Mount the 95 mm bore 33019 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 330 series at 95 mm bore (145×39 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 30219 of the same bore — confirm the L10 margin before downsizing into it.", "A single 33019 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use an O or X matched pair for bidirectional location.", "Do not mix brands or executions inside one 33019 pair — matched sets are ground for a specific setting, and pairing a SKF basic unit with a different suffix variant will not share the setting evenly.", "Shaft and housing fillets must clear the bearing chamfer so the 39 mm-wide cup seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 272/375 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 33019 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 33019 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 33019?", "a": "The SKF 33019 is a single-row tapered roller bearing with 95 mm bore, 145 mm outer diameter and 39 mm width (3.74 × 5.709 × 1.535 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 272 kN, C0 375 kN, fatigue load limit Pu 40.5 kN, reference speed 3,400 r/min, limiting speed 4,300 r/min, mass about 2300 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 33019 bore code work?", "a": "The last two digits of 33019 are bore code 19, so 19 × 5 = 95 mm bore. The 145 mm OD and 39 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 33019 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 30 is the ISO 355 series (slim light section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 33019 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 33019 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 33019 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "33019", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "33019" ], "locale_variants": {} }, { "sku": "33020", "brand": "SKF", "manufacturer_designation": "SKF 33020", "series": "33000-series", "type": "tapered_roller", "d_mm": 100, "D_mm": 150, "B_mm": 39, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 278, "static_load_kN": 390, "fatigue_load_limit_kN": 41.5, "max_rpm": 4000, "reference_speed_rpm": 3400, "limiting_speed_rpm": 4000, "weight_g": 2400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "SKF 33020 belongs to the SKF single-row tapered roller range — the 100 mm bore entry in the 33000 series, dimensioned 150 mm OD and 39 mm wide to the ISO 355 boundary plan.Digit by digit, 33020 reads as bearing type 3 (single-row tapered roller), slim light section series 30, and bore reference 20 resolving to 100 mm; 150 mm OD and 39 mm width are the matching ISO 355 boundary values. The SKF catalogue adds the ISO 355 dimension-series code after the bare number (e.g. 2CE); it is the dimensional series, not a separate part number. The 25.0 mm radial section height ((150−100)/2) and 2400 g catalogue mass frame a 100 mm bore bearing rated at 278 kN C — roughly 2.78 kN of dynamic capacity per millimetre of bore before application factors. Because the contact line is tapered, one 33020 reacts thrust in a single direction; bidirectional shafts need an O or X pair, and a rotating cone on a 100 mm shaft typically takes a k5 seat with an H7 housing bore.", "applications": [ "rolling-mill auxiliary drives", "crane sheave and hoist gearboxes", "paper-machine and printing rolls", "construction machinery drives" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting", "uneven load sharing in a pair when spacer faces are not parallel to the bore", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "brinelling from pressing the cone or cup home through the rollers" ], "pitfalls": [ "Mount the 100 mm bore 33020 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 330 series at 100 mm bore (150×39 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 30220 of the same bore — confirm the L10 margin before downsizing into it.", "A single 33020 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use an O or X matched pair for bidirectional location.", "When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 33020 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.", "Never press both rings through the wrong element during fitting: force for an interference shaft seat goes through the cone only, or brinell marks on the 150 mm cup race release as noise within the first running hours.", "The 278/390 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 33020 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 33020 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 33020?", "a": "The SKF 33020 is a single-row tapered roller bearing with 100 mm bore, 150 mm outer diameter and 39 mm width (3.937 × 5.906 × 1.535 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 278 kN, C0 390 kN, fatigue load limit Pu 41.5 kN, reference speed 3,400 r/min, limiting speed 4,000 r/min, mass about 2400 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 33020 bore code work?", "a": "The last two digits of 33020 are bore code 20, so 20 × 5 = 100 mm bore. The 150 mm OD and 39 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 33020 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 30 is the ISO 355 series (slim light section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 33020 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 33020 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 33020 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "33020", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "33020" ], "locale_variants": {} }, { "sku": "33021", "brand": "SKF", "manufacturer_designation": "SKF 33021", "series": "33000-series", "type": "tapered_roller", "d_mm": 105, "D_mm": 160, "B_mm": 43, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 303, "static_load_kN": 430, "fatigue_load_limit_kN": 45.5, "max_rpm": 3800, "reference_speed_rpm": 3200, "limiting_speed_rpm": 3800, "weight_g": 3000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "For a 105 mm shaft carrying combined load, SKF lists 33021 under catalogue execution SKF 33021: one open single-row tapered roller bearing in the slim light section of the 33000 family.Numbering ties the bearing to its envelope: 33021 means tapered-roller type 3, slim light section series 30, 105 mm bore — which is why the 160×43 mm outline swaps dimensionally with other ISO 355 bearings of the same code. The SKF catalogue adds the ISO 355 dimension-series code after the bare number (e.g. 2DE); it is the dimensional series, not a separate part number. Catalogue mass 3000 g for the 105×160×43 mm open execution covers the pressed-steel cage and standard roller complement; sealed or special-clearance variants differ slightly in mass and carry their own order numbers. For a 105 mm shaft the usual cone seat is m6 with an H7 housing when the inner ring rotates; arrange two 33021 bearings as a set for two-direction location and set clearance from the load diagram, never from assembly feel.", "applications": [ "paper-machine and printing rolls", "construction machinery drives", "marine deck machinery shafts", "heavy industrial gearboxes and speed reducers" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "false brinelling on idle paired sets exposed to machine vibration", "roller large-end smearing against the cone rib after EP lubricant film failure", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount the 105 mm bore 33021 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 330 series at 105 mm bore (160×43 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 30221 of the same bore — confirm the L10 margin before downsizing into it.", "At the 303 kN rating of 33021, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 3,800 r/min speed end and heavier preload only where moment stiffness dominates.", "Do not mix brands or executions inside one 33021 pair — matched sets are ground for a specific setting, and pairing a SKF basic unit with a different suffix variant will not share the setting evenly.", "The pressed-steel cage is rated for standard industrial service; sustained running above the limiting speed or with degraded lubricant wears the cage pockets — inspect the cage at every relubrication interval.", "The 303/430 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 33021 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 33021 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 33021?", "a": "The SKF 33021 is a single-row tapered roller bearing with 105 mm bore, 160 mm outer diameter and 43 mm width (4.134 × 6.299 × 1.693 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 303 kN, C0 430 kN, fatigue load limit Pu 45.5 kN, reference speed 3,200 r/min, limiting speed 3,800 r/min, mass about 3000 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 33021 bore code work?", "a": "The last two digits of 33021 are bore code 21, so 21 × 5 = 105 mm bore. The 160 mm OD and 43 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 33021 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 30 is the ISO 355 series (slim light section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 33021 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 33021 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 33021 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "33021", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "33021" ], "locale_variants": {} }, { "sku": "33022", "brand": "SKF", "manufacturer_designation": "SKF 33022", "series": "33000-series", "type": "tapered_roller", "d_mm": 110, "D_mm": 170, "B_mm": 47, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 343, "static_load_kN": 500, "fatigue_load_limit_kN": 53, "max_rpm": 3600, "reference_speed_rpm": 3000, "limiting_speed_rpm": 3600, "weight_g": 3850, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "SKF 33022 (SKF 33022) is the slim light section tapered roller choice for a 110 mm shaft — one row of tapered rollers on an asymmetric raceway inside the 170×47 mm ISO 355 envelope.On the SKF nameplate, 33022 follows the ISO 355 convention: 3 for the tapered-roller type, 30 for the slim light section, final digits 22 for the 110 mm bore. The SKF catalogue adds the ISO 355 dimension-series code after the bare number (e.g. 2DE); it is the dimensional series, not a separate part number. At 3,000 r/min reference speed the 30.0 mm-section 33022 is governed thermally by preload and lubricant flow; grease or oil selection should be made against that value, with 3,600 r/min as the mechanical ceiling. Mounting practice for 33022: the rotating cone takes the interference fit (m6 on a 110 mm shaft), the cup slides for axial location, and reversing-thrust duty demands a paired O/X set rather than one bearing.", "applications": [ "marine deck machinery shafts", "heavy industrial gearboxes and speed reducers", "large process pump and compressor shafts", "rolling-mill auxiliary drives" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "axial overload spalling at the roller-rib contact beyond the single-row thrust rating", "preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "grease degradation after long shelf storage without rotation or re-greasing" ], "pitfalls": [ "Mount the 110 mm bore 33022 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 330 series at 110 mm bore (170×47 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 30222 of the same bore — confirm the L10 margin before downsizing into it.", "When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 33022 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.", "O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 33022 mounting error.", "The 3850 g mass and 47 mm width mean spacer and abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the contact angle and concentrates load on one rib of 33022.", "The 343/500 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 33022 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 33022 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 33022?", "a": "The SKF 33022 is a single-row tapered roller bearing with 110 mm bore, 170 mm outer diameter and 47 mm width (4.331 × 6.693 × 1.85 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 343 kN, C0 500 kN, fatigue load limit Pu 53 kN, reference speed 3,000 r/min, limiting speed 3,600 r/min, mass about 3850 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 33022 bore code work?", "a": "The last two digits of 33022 are bore code 22, so 22 × 5 = 110 mm bore. The 170 mm OD and 47 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 33022 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 30 is the ISO 355 series (slim light section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 33022 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 33022 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 33022 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "33022", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "33022" ], "locale_variants": {} }, { "sku": "33024", "brand": "SKF", "manufacturer_designation": "SKF 33024", "series": "33000-series", "type": "tapered_roller", "d_mm": 120, "D_mm": 180, "B_mm": 48, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 356, "static_load_kN": 540, "fatigue_load_limit_kN": 56, "max_rpm": 3400, "reference_speed_rpm": 2800, "limiting_speed_rpm": 3400, "weight_g": 4200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "33024 is a single-row tapered roller bearing in the ISO 33000 dimension series: a separable cone-and-cup design for combined radial and one-direction axial load, listed by SKF in SKF catalogue PUB BU/P1 17000.Reading the designation: the leading 3 marks a single-row tapered roller bearing, the 30 is the ISO 355 diameter/width series (slim light section), and the last two digits encode the 120 mm bore; the 180 mm OD and 48 mm width follow the ISO 355 general plan. The SKF catalogue adds the ISO 355 dimension-series code after the bare number (e.g. 2DE); it is the dimensional series, not a separate part number. With C 356 kN and C0 540 kN, the 33024 pair-sizing check is dominated by the axial share: keep the equivalent load P below the rating at the required L10, remembering one bearing alone cannot cover reversing thrust at 3,400 r/min. A single 33024 locates the shaft in one axial direction only; mount it against a second bearing in O (back-to-back) or X (face-to-face) arrangement, and set the running clearance by the mounting procedure — not by feel.", "applications": [ "marine propulsion gearboxes", "large industrial mixer shafts", "offshore winch and drawworks drums", "rolling-mill roll-neck bearings" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "roller large-end smearing against the cone rib after EP lubricant film failure", "false brinelling on idle paired sets exposed to machine vibration", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "rib-roller contact scoring from loss of the EP additive film" ], "pitfalls": [ "At 120 mm bore the cone mass is high enough that cocking during mounting damages the cage and rib; guide the ring square, confirm seat contact around the full circumference, and re-check setting after the first thermal cycle of the paired set.", "The 330 series at 120 mm bore (180×48 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 30224 of the same bore — confirm the L10 margin before downsizing into it.", "O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 33024 mounting error.", "Setting is a design value, not an assembly feel: excessive preload in the 33024 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.", "Shaft and housing fillets must clear the bearing chamfer so the 48 mm-wide cup seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 356/540 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 33024 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 33024 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 33024?", "a": "The SKF 33024 is a single-row tapered roller bearing with 120 mm bore, 180 mm outer diameter and 48 mm width (4.724 × 7.087 × 1.89 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 356 kN, C0 540 kN, fatigue load limit Pu 56 kN, reference speed 2,800 r/min, limiting speed 3,400 r/min, mass about 4200 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 33024 bore code work?", "a": "The last two digits of 33024 are bore code 24, so 24 × 5 = 120 mm bore. The 180 mm OD and 48 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 33024 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 30 is the ISO 355 series (slim light section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 33024 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 33024 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 33024 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "33024", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "33024" ], "locale_variants": {} }, { "sku": "33026", "brand": "SKF", "manufacturer_designation": "SKF 33026", "series": "33000-series", "type": "tapered_roller", "d_mm": 130, "D_mm": 200, "B_mm": 55, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 470, "static_load_kN": 680, "fatigue_load_limit_kN": 69.5, "max_rpm": 3000, "reference_speed_rpm": 2400, "limiting_speed_rpm": 3000, "weight_g": 6150, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 33026 appears as SKF 33026: an open, single-row tapered roller bearing in the slim light section of the 33000 dimension series, supplied with a pressed-steel cage as standard.Numbering ties the bearing to its envelope: 33026 means tapered-roller type 3, slim light section series 30, 130 mm bore — which is why the 200×55 mm outline swaps dimensionally with other ISO 355 bearings of the same code. The SKF catalogue adds the ISO 355 dimension-series code after the bare number (e.g. 2EE); it is the dimensional series, not a separate part number. Selection arithmetic: the C0/C ratio is about 1.45 (static 680 kN against dynamic 470 kN), typical of a tapered roller sized for axial capacity, and the 69.5 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Specify pairs rather than single units wherever thrust reverses: the tapered contact of 33026 generates an induced axial load under radial force, and an unpaired bearing on a reversing shaft will run slack and fret its seat.", "applications": [ "heavy-duty rolling-mill gearboxes", "large crusher and mineral-processing drives", "wind-turbine main shafts", "marine propulsion gearboxes" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting", "uneven load sharing in a pair when spacer faces are not parallel to the bore", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "At 130 mm bore the cone mass is high enough that cocking during mounting damages the cage and rib; guide the ring square, confirm seat contact around the full circumference, and re-check setting after the first thermal cycle of the paired set.", "The 330 series at 130 mm bore (200×55 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 30226 of the same bore — confirm the L10 margin before downsizing into it.", "Setting is a design value, not an assembly feel: excessive preload in the 33026 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.", "At the 470 kN rating of 33026, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 3,000 r/min speed end and heavier preload only where moment stiffness dominates.", "The 33026 shares its ISO 355 envelope with other tapered bearings of the same code but is not a drop-in replacement for a ball bearing: it cannot run effectively under pure radial load without a minimum axial load, and a deep-groove bearing cannot replace its combined-load duty.", "The 470/680 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 33026 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 33026 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 33026?", "a": "The SKF 33026 is a single-row tapered roller bearing with 130 mm bore, 200 mm outer diameter and 55 mm width (5.118 × 7.874 × 2.165 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 470 kN, C0 680 kN, fatigue load limit Pu 69.5 kN, reference speed 2,400 r/min, limiting speed 3,000 r/min, mass about 6150 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 33026 bore code work?", "a": "The last two digits of 33026 are bore code 26, so 26 × 5 = 130 mm bore. The 200 mm OD and 55 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 33026 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 30 is the ISO 355 series (slim light section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 33026 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 33026 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 33026 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "33026", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "33026" ], "locale_variants": {} }, { "sku": "33030", "brand": "SKF", "manufacturer_designation": "SKF 33030", "series": "33000-series", "type": "tapered_roller", "d_mm": 150, "D_mm": 225, "B_mm": 59, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 487, "static_load_kN": 865, "fatigue_load_limit_kN": 85, "max_rpm": 2600, "reference_speed_rpm": 2200, "limiting_speed_rpm": 2600, "weight_g": 8050, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "Ordering number SKF 33030 in SKF catalogue PUB BU/P1 17000 denotes a single-row tapered roller bearing for a 150 mm shaft, slim light section, with an open pressed-steel-cage execution and one-direction axial capacity.On the SKF nameplate, 33030 follows the ISO 355 convention: 3 for the tapered-roller type, 30 for the slim light section, final digits 30 for the 150 mm bore. The SKF catalogue adds the ISO 355 dimension-series code after the bare number (e.g. 2EE); it is the dimensional series, not a separate part number. With C 487 kN and C0 865 kN, the 33030 pair-sizing check is dominated by the axial share: keep the equivalent load P below the rating at the required L10, remembering one bearing alone cannot cover reversing thrust at 2,600 r/min. Specify pairs rather than single units wherever thrust reverses: the tapered contact of 33030 generates an induced axial load under radial force, and an unpaired bearing on a reversing shaft will run slack and fret its seat.", "applications": [ "marine propulsion gearboxes", "large industrial mixer shafts", "offshore winch and drawworks drums", "rolling-mill roll-neck bearings" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "false brinelling on idle paired sets exposed to machine vibration", "roller large-end smearing against the cone rib after EP lubricant film failure", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "At 150 mm bore the cone mass is high enough that cocking during mounting damages the cage and rib; guide the ring square, confirm seat contact around the full circumference, and re-check setting after the first thermal cycle of the paired set.", "The 330 series at 150 mm bore (225×59 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 30230 of the same bore — confirm the L10 margin before downsizing into it.", "When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 33030 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.", "Do not mix brands or executions inside one 33030 pair — matched sets are ground for a specific setting, and pairing a SKF basic unit with a different suffix variant will not share the setting evenly.", "Catalogue reference speed and limiting speed are different limits: the 2,200 r/min reference is a thermal criterion under load, while the 2,600 r/min limiting value is the mechanical ceiling — observe both.", "The 487/865 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 33030 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 33030 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 33030?", "a": "The SKF 33030 is a single-row tapered roller bearing with 150 mm bore, 225 mm outer diameter and 59 mm width (5.906 × 8.858 × 2.323 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 487 kN, C0 865 kN, fatigue load limit Pu 85 kN, reference speed 2,200 r/min, limiting speed 2,600 r/min, mass about 8050 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 33030 bore code work?", "a": "The last two digits of 33030 are bore code 30, so 30 × 5 = 150 mm bore. The 225 mm OD and 59 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 33030 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 30 is the ISO 355 series (slim light section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 33030 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 33030 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 33030 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "33030", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "33030" ], "locale_variants": {} }, { "sku": "33108", "brand": "SKF", "manufacturer_designation": "SKF 33108", "series": "33100-series", "type": "tapered_roller", "d_mm": 40, "D_mm": 75, "B_mm": 26, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 97.5, "static_load_kN": 104, "fatigue_load_limit_kN": 11.4, "max_rpm": 9000, "reference_speed_rpm": 7000, "limiting_speed_rpm": 9000, "weight_g": 500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "33108 is a single-row tapered roller bearing in the ISO 33100 dimension series: a separable cone-and-cup design for combined radial and one-direction axial load, listed by SKF in SKF catalogue PUB BU/P1 17000.The code breaks down as type prefix 3 (tapered roller), series 31 (the light wide section), and bore code 08 = 40 mm; dimensions 40×75×26 mm therefore match the ISO 355 envelope. In SKF suffix language a bare 33108 is the standard execution; B marks a larger contact angle and Q or J2 mark clearance/cage variants, all quoted separately. Selection arithmetic: the C0/C ratio is about 1.07 (static 104 kN against dynamic 97.5 kN), typical of a tapered roller sized for axial capacity, and the 11.4 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Because the contact line is tapered, one 33108 reacts thrust in a single direction; bidirectional shafts need an O or X pair, and a rotating cone on a 40 mm shaft typically takes a k5 seat with an H7 housing bore.", "applications": [ "automotive and light-truck wheel hubs", "industrial gearbox shafts and reducers", "differential and pinion drives", "pump and compressor shafts" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "false brinelling on idle paired sets exposed to machine vibration", "roller large-end smearing against the cone rib after EP lubricant film failure", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "On this 40 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 33108 pair heats, loses setting control and smears the roller-rib contact.", "The 331 series at 40 mm bore (75×26 mm) pairs a small OD with a wide section — a compact way to add capacity where radial space is tight; abutment and spacer widths differ from the 330/302 families, so it is not a drop-in swap.", "At the 97.5 kN rating of 33108, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 9,000 r/min speed end and heavier preload only where moment stiffness dominates.", "O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 33108 mounting error.", "The 33108 shares its ISO 355 envelope with other tapered bearings of the same code but is not a drop-in replacement for a ball bearing: it cannot run effectively under pure radial load without a minimum axial load, and a deep-groove bearing cannot replace its combined-load duty.", "The 97.5/104 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 33108 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 33108 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 33108?", "a": "The SKF 33108 is a single-row tapered roller bearing with 40 mm bore, 75 mm outer diameter and 26 mm width (1.575 × 2.953 × 1.024 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 97.5 kN, C0 104 kN, fatigue load limit Pu 11.4 kN, reference speed 7,000 r/min, limiting speed 9,000 r/min, mass about 500 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 33108 bore code work?", "a": "The last two digits of 33108 are bore code 08, so 08 × 5 = 40 mm bore. The 75 mm OD and 26 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 33108 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 31 is the ISO 355 series (light wide section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 33108 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 33108 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 33108 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "33108-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×75×26 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "33108", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "33108" ], "locale_variants": {} }, { "sku": "33109", "brand": "SKF", "manufacturer_designation": "SKF 33109", "series": "33100-series", "type": "tapered_roller", "d_mm": 45, "D_mm": 80, "B_mm": 26, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 104, "static_load_kN": 114, "fatigue_load_limit_kN": 12.9, "max_rpm": 8000, "reference_speed_rpm": 6700, "limiting_speed_rpm": 8000, "weight_g": 550, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "The SKF 33109 is a 45×80×26 mm single-row tapered roller bearing — the light wide section entry in the 33100 series, with an asymmetric raceway cut for thrust capacity and separable mounting.Reading the designation: the leading 3 marks a single-row tapered roller bearing, the 31 is the ISO 355 diameter/width series (light wide section), and the last two digits encode the 45 mm bore; the 80 mm OD and 26 mm width follow the ISO 355 general plan. In SKF suffix language a bare 33109 is the standard execution; B marks a larger contact angle and Q or J2 mark clearance/cage variants, all quoted separately. The 17.5 mm radial section height ((80−45)/2) and 550 g catalogue mass frame a 45 mm bore bearing rated at 104 kN C — roughly 2.31 kN of dynamic capacity per millimetre of bore before application factors. For a 45 mm shaft the usual cone seat is k5 with an H7 housing when the inner ring rotates; arrange two 33109 bearings as a set for two-direction location and set clearance from the load diagram, never from assembly feel.", "applications": [ "differential and pinion drives", "pump and compressor shafts", "machine-tool spindles", "belt-driven fan and blower shafts" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "axial overload spalling at the roller-rib contact beyond the single-row thrust rating", "preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "brinelling from pressing the cone or cup home through the rollers" ], "pitfalls": [ "On this 45 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 33109 pair heats, loses setting control and smears the roller-rib contact.", "The 331 series at 45 mm bore (80×26 mm) pairs a small OD with a wide section — a compact way to add capacity where radial space is tight; abutment and spacer widths differ from the 330/302 families, so it is not a drop-in swap.", "When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 33109 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.", "The tapered contact angle creates an induced axial load under pure radial force; include it in the 33109 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.", "Never press both rings through the wrong element during fitting: force for an interference shaft seat goes through the cone only, or brinell marks on the 80 mm cup race release as noise within the first running hours.", "The 104/114 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 33109 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 33109 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 33109?", "a": "The SKF 33109 is a single-row tapered roller bearing with 45 mm bore, 80 mm outer diameter and 26 mm width (1.772 × 3.15 × 1.024 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 104 kN, C0 114 kN, fatigue load limit Pu 12.9 kN, reference speed 6,700 r/min, limiting speed 8,000 r/min, mass about 550 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 33109 bore code work?", "a": "The last two digits of 33109 are bore code 09, so 09 × 5 = 45 mm bore. The 80 mm OD and 26 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 33109 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 31 is the ISO 355 series (light wide section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 33109 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 33109 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 33109 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "33109-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×80×26 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "33109", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "33109" ], "locale_variants": {} }, { "sku": "33110", "brand": "SKF", "manufacturer_designation": "SKF 33110", "series": "33100-series", "type": "tapered_roller", "d_mm": 50, "D_mm": 85, "B_mm": 26, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 106, "static_load_kN": 122, "fatigue_load_limit_kN": 13.4, "max_rpm": 7500, "reference_speed_rpm": 6000, "limiting_speed_rpm": 7500, "weight_g": 580, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 33110 appears as SKF 33110: an open, single-row tapered roller bearing in the light wide section of the 33100 dimension series, supplied with a pressed-steel cage as standard.On the SKF nameplate, 33110 follows the ISO 355 convention: 3 for the tapered-roller type, 31 for the light wide section, final digits 10 for the 50 mm bore. In SKF suffix language a bare 33110 is the standard execution; B marks a larger contact angle and Q or J2 mark clearance/cage variants, all quoted separately. At 6,000 r/min reference speed the 17.5 mm-section 33110 is governed thermally by preload and lubricant flow; grease or oil selection should be made against that value, with 7,500 r/min as the mechanical ceiling. Note the minimum-axial-load requirement: at light radial load and high speed the rollers of 33110 must still be held into the rib contact, which is another reason the catalogue recommends paired mounting with controlled setting.", "applications": [ "axle-boxes in material-handling equipment", "automotive and light-truck wheel hubs", "industrial gearbox shafts and reducers", "differential and pinion drives" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting", "uneven load sharing in a pair when spacer faces are not parallel to the bore", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "On this 50 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 33110 pair heats, loses setting control and smears the roller-rib contact.", "The 331 series at 50 mm bore (85×26 mm) pairs a small OD with a wide section — a compact way to add capacity where radial space is tight; abutment and spacer widths differ from the 330/302 families, so it is not a drop-in swap.", "When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 33110 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.", "O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 33110 mounting error.", "Open 33110 units need application-supplied sealing and a defined EP lubricant supply; the roller-rib contact is the first to fail when the additive film breaks down.", "The 106/122 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 33110 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 33110 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 33110?", "a": "The SKF 33110 is a single-row tapered roller bearing with 50 mm bore, 85 mm outer diameter and 26 mm width (1.969 × 3.346 × 1.024 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 106 kN, C0 122 kN, fatigue load limit Pu 13.4 kN, reference speed 6,000 r/min, limiting speed 7,500 r/min, mass about 580 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 33110 bore code work?", "a": "The last two digits of 33110 are bore code 10, so 10 × 5 = 50 mm bore. The 85 mm OD and 26 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 33110 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 31 is the ISO 355 series (light wide section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 33110 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 33110 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 33110 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "33110-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×85×26 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "33110", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "33110" ], "locale_variants": {} }, { "sku": "33111", "brand": "SKF", "manufacturer_designation": "SKF 33111", "series": "33100-series", "type": "tapered_roller", "d_mm": 55, "D_mm": 95, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 136, "static_load_kN": 156, "fatigue_load_limit_kN": 17.6, "max_rpm": 6700, "reference_speed_rpm": 5600, "limiting_speed_rpm": 6700, "weight_g": 850, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "SKF 33111 belongs to the SKF single-row tapered roller range — the 55 mm bore entry in the 33100 series, dimensioned 95 mm OD and 30 mm wide to the ISO 355 boundary plan.The code breaks down as type prefix 3 (tapered roller), series 31 (the light wide section), and bore code 11 = 55 mm; dimensions 55×95×30 mm therefore match the ISO 355 envelope. In SKF suffix language a bare 33111 is the standard execution; B marks a larger contact angle and Q or J2 mark clearance/cage variants, all quoted separately. Speed planning uses two different ceilings: 5,600 r/min thermal reference and 6,700 r/min mechanical limiting speed. Specify pairs rather than single units wherever thrust reverses: the tapered contact of 33111 generates an induced axial load under radial force, and an unpaired bearing on a reversing shaft will run slack and fret its seat.", "applications": [ "industrial gearbox shafts and reducers", "differential and pinion drives", "pump and compressor shafts", "machine-tool spindles" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "false brinelling on idle paired sets exposed to machine vibration", "roller large-end smearing against the cone rib after EP lubricant film failure", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "On this 55 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 33111 pair heats, loses setting control and smears the roller-rib contact.", "The 331 series at 55 mm bore (95×30 mm) pairs a small OD with a wide section — a compact way to add capacity where radial space is tight; abutment and spacer widths differ from the 330/302 families, so it is not a drop-in swap.", "Do not mix brands or executions inside one 33111 pair — matched sets are ground for a specific setting, and pairing a SKF basic unit with a different suffix variant will not share the setting evenly.", "The tapered contact angle creates an induced axial load under pure radial force; include it in the 33111 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.", "Shaft and housing fillets must clear the bearing chamfer so the 30 mm-wide cup seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 136/156 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 33111 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 33111 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 33111?", "a": "The SKF 33111 is a single-row tapered roller bearing with 55 mm bore, 95 mm outer diameter and 30 mm width (2.165 × 3.74 × 1.181 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 136 kN, C0 156 kN, fatigue load limit Pu 17.6 kN, reference speed 5,600 r/min, limiting speed 6,700 r/min, mass about 850 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 33111 bore code work?", "a": "The last two digits of 33111 are bore code 11, so 11 × 5 = 55 mm bore. The 95 mm OD and 30 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 33111 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 31 is the ISO 355 series (light wide section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 33111 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 33111 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 33111 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "33111-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×95×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "33111", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "33111" ], "locale_variants": {} }, { "sku": "33112", "brand": "SKF", "manufacturer_designation": "SKF 33112", "series": "33100-series", "type": "tapered_roller", "d_mm": 60, "D_mm": 100, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 144, "static_load_kN": 170, "fatigue_load_limit_kN": 19.6, "max_rpm": 6300, "reference_speed_rpm": 5300, "limiting_speed_rpm": 6300, "weight_g": 920, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "For a 60 mm shaft carrying combined load, SKF lists 33112 under catalogue execution SKF 33112: one open single-row tapered roller bearing in the light wide section of the 33100 family.Reading the designation: the leading 3 marks a single-row tapered roller bearing, the 31 is the ISO 355 diameter/width series (light wide section), and the last two digits encode the 60 mm bore; the 100 mm OD and 30 mm width follow the ISO 355 general plan. In SKF suffix language a bare 33112 is the standard execution; B marks a larger contact angle and Q or J2 mark clearance/cage variants, all quoted separately. With C 144 kN and C0 170 kN, the 33112 pair-sizing check is dominated by the axial share: keep the equivalent load P below the rating at the required L10, remembering one bearing alone cannot cover reversing thrust at 6,300 r/min. Because the contact line is tapered, one 33112 reacts thrust in a single direction; bidirectional shafts need an O or X pair, and a rotating cone on a 60 mm shaft typically takes a k5 seat with an H7 housing bore.", "applications": [ "crane sheave and hoist gearboxes", "paper-machine and printing rolls", "construction machinery drives", "marine deck machinery shafts" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "axial overload spalling at the roller-rib contact beyond the single-row thrust rating", "preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "brinelling from pressing the cone or cup home through the rollers" ], "pitfalls": [ "Mount the 60 mm bore 33112 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 331 series at 60 mm bore (100×30 mm) pairs a small OD with a wide section — a compact way to add capacity where radial space is tight; abutment and spacer widths differ from the 330/302 families, so it is not a drop-in swap.", "O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 33112 mounting error.", "Setting is a design value, not an assembly feel: excessive preload in the 33112 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.", "Catalogue reference speed and limiting speed are different limits: the 5,300 r/min reference is a thermal criterion under load, while the 6,300 r/min limiting value is the mechanical ceiling — observe both.", "The 144/170 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 33112 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 33112 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 33112?", "a": "The SKF 33112 is a single-row tapered roller bearing with 60 mm bore, 100 mm outer diameter and 30 mm width (2.362 × 3.937 × 1.181 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 144 kN, C0 170 kN, fatigue load limit Pu 19.6 kN, reference speed 5,300 r/min, limiting speed 6,300 r/min, mass about 920 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 33112 bore code work?", "a": "The last two digits of 33112 are bore code 12, so 12 × 5 = 60 mm bore. The 100 mm OD and 30 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 33112 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 31 is the ISO 355 series (light wide section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 33112 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 33112 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 33112 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "33112-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×100×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "33112", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "33112" ], "locale_variants": {} }, { "sku": "33113", "brand": "SKF", "manufacturer_designation": "SKF 33113", "series": "33100-series", "type": "tapered_roller", "d_mm": 65, "D_mm": 110, "B_mm": 34, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 175, "static_load_kN": 208, "fatigue_load_limit_kN": 24, "max_rpm": 5600, "reference_speed_rpm": 4800, "limiting_speed_rpm": 5600, "weight_g": 1300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "SKF 33113 (SKF 33113) is the light wide section tapered roller choice for a 65 mm shaft — one row of tapered rollers on an asymmetric raceway inside the 110×34 mm ISO 355 envelope.Digit by digit, 33113 reads as bearing type 3 (single-row tapered roller), light wide section series 31, and bore reference 13 resolving to 65 mm; 110 mm OD and 34 mm width are the matching ISO 355 boundary values. In SKF suffix language a bare 33113 is the standard execution; B marks a larger contact angle and Q or J2 mark clearance/cage variants, all quoted separately. The 24 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.19 C0/C balance shows this execution is tuned to thrust-heavy combined loads rather than pure radial running. For a 65 mm shaft the usual cone seat is k5 with an H7 housing when the inner ring rotates; arrange two 33113 bearings as a set for two-direction location and set clearance from the load diagram, never from assembly feel.", "applications": [ "construction machinery drives", "marine deck machinery shafts", "heavy industrial gearboxes and speed reducers", "large process pump and compressor shafts" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "uneven load sharing in a pair when spacer faces are not parallel to the bore", "thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount the 65 mm bore 33113 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 331 series at 65 mm bore (110×34 mm) pairs a small OD with a wide section — a compact way to add capacity where radial space is tight; abutment and spacer widths differ from the 330/302 families, so it is not a drop-in swap.", "The tapered contact angle creates an induced axial load under pure radial force; include it in the 33113 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.", "A single 33113 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use an O or X matched pair for bidirectional location.", "The 33113 shares its ISO 355 envelope with other tapered bearings of the same code but is not a drop-in replacement for a ball bearing: it cannot run effectively under pure radial load without a minimum axial load, and a deep-groove bearing cannot replace its combined-load duty.", "The 175/208 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 33113 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 33113 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 33113?", "a": "The SKF 33113 is a single-row tapered roller bearing with 65 mm bore, 110 mm outer diameter and 34 mm width (2.559 × 4.331 × 1.339 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 175 kN, C0 208 kN, fatigue load limit Pu 24 kN, reference speed 4,800 r/min, limiting speed 5,600 r/min, mass about 1300 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 33113 bore code work?", "a": "The last two digits of 33113 are bore code 13, so 13 × 5 = 65 mm bore. The 110 mm OD and 34 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 33113 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 31 is the ISO 355 series (light wide section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 33113 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 33113 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 33113 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "33113-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "33113", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "33113R", "equiv_brand": "SKF", "level": "partial", "note": "Flanged-cup variant of this base bearing: same d/D/T boundary, different housing location concept — not a drop-in substitute where the flange is the axial register." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "33113" ], "locale_variants": {} }, { "sku": "33114", "brand": "SKF", "manufacturer_designation": "SKF 33114", "series": "33100-series", "type": "tapered_roller", "d_mm": 70, "D_mm": 120, "B_mm": 37, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 211, "static_load_kN": 250, "fatigue_load_limit_kN": 28.5, "max_rpm": 5300, "reference_speed_rpm": 4300, "limiting_speed_rpm": 5300, "weight_g": 1700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "Ordering number SKF 33114 in SKF catalogue PUB BU/P1 17000 denotes a single-row tapered roller bearing for a 70 mm shaft, light wide section, with an open pressed-steel-cage execution and one-direction axial capacity.Numbering ties the bearing to its envelope: 33114 means tapered-roller type 3, light wide section series 31, 70 mm bore — which is why the 120×37 mm outline swaps dimensionally with other ISO 355 bearings of the same code. In SKF suffix language a bare 33114 is the standard execution; B marks a larger contact angle and Q or J2 mark clearance/cage variants, all quoted separately. Selection arithmetic: the C0/C ratio is about 1.18 (static 250 kN against dynamic 211 kN), typical of a tapered roller sized for axial capacity, and the 28.5 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Mounting practice for 33114: the rotating cone takes the interference fit (k5 on a 70 mm shaft), the cup slides for axial location, and reversing-thrust duty demands a paired O/X set rather than one bearing.", "applications": [ "heavy industrial gearboxes and speed reducers", "large process pump and compressor shafts", "rolling-mill auxiliary drives", "crane sheave and hoist gearboxes" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "roller large-end smearing against the cone rib after EP lubricant film failure", "false brinelling on idle paired sets exposed to machine vibration", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "grease degradation after long shelf storage without rotation or re-greasing" ], "pitfalls": [ "Mount the 70 mm bore 33114 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 331 series at 70 mm bore (120×37 mm) pairs a small OD with a wide section — a compact way to add capacity where radial space is tight; abutment and spacer widths differ from the 330/302 families, so it is not a drop-in swap.", "Setting is a design value, not an assembly feel: excessive preload in the 33114 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.", "At the 211 kN rating of 33114, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 5,300 r/min speed end and heavier preload only where moment stiffness dominates.", "Never press both rings through the wrong element during fitting: force for an interference shaft seat goes through the cone only, or brinell marks on the 120 mm cup race release as noise within the first running hours.", "The 211/250 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 33114 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 33114 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 33114?", "a": "The SKF 33114 is a single-row tapered roller bearing with 70 mm bore, 120 mm outer diameter and 37 mm width (2.756 × 4.724 × 1.457 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 211 kN, C0 250 kN, fatigue load limit Pu 28.5 kN, reference speed 4,300 r/min, limiting speed 5,300 r/min, mass about 1700 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 33114 bore code work?", "a": "The last two digits of 33114 are bore code 14, so 14 × 5 = 70 mm bore. The 120 mm OD and 37 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 33114 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 31 is the ISO 355 series (light wide section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 33114 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 33114 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 33114 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "33114", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "33114" ], "locale_variants": {} }, { "sku": "33115", "brand": "SKF", "manufacturer_designation": "SKF 33115", "series": "33100-series", "type": "tapered_roller", "d_mm": 75, "D_mm": 125, "B_mm": 37, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 216, "static_load_kN": 265, "fatigue_load_limit_kN": 30, "max_rpm": 5000, "reference_speed_rpm": 4000, "limiting_speed_rpm": 5000, "weight_g": 1800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "33115 is a single-row tapered roller bearing in the ISO 33100 dimension series: a separable cone-and-cup design for combined radial and one-direction axial load, listed by SKF in SKF catalogue PUB BU/P1 17000.On the SKF nameplate, 33115 follows the ISO 355 convention: 3 for the tapered-roller type, 31 for the light wide section, final digits 15 for the 75 mm bore. In SKF suffix language a bare 33115 is the standard execution; B marks a larger contact angle and Q or J2 mark clearance/cage variants, all quoted separately. The 25.0 mm radial section height ((125−75)/2) and 1800 g catalogue mass frame a 75 mm bore bearing rated at 216 kN C — roughly 2.88 kN of dynamic capacity per millimetre of bore before application factors. Fit selection follows the rotating ring — interference on a rotating cone — and two 33115 units are required to take reversing thrust; keep the induced axial load inside the rated capacity when calculating the pair.", "applications": [ "rolling-mill auxiliary drives", "crane sheave and hoist gearboxes", "paper-machine and printing rolls", "construction machinery drives" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways", "axial overload spalling at the roller-rib contact beyond the single-row thrust rating", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "mounting score marks when the cone is cocked over the shaft keyway or a burr" ], "pitfalls": [ "Mount the 75 mm bore 33115 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 331 series at 75 mm bore (125×37 mm) pairs a small OD with a wide section — a compact way to add capacity where radial space is tight; abutment and spacer widths differ from the 330/302 families, so it is not a drop-in swap.", "A single 33115 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use an O or X matched pair for bidirectional location.", "When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 33115 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.", "The pressed-steel cage is rated for standard industrial service; sustained running above the limiting speed or with degraded lubricant wears the cage pockets — inspect the cage at every relubrication interval.", "The 216/265 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 33115 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 33115 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 33115?", "a": "The SKF 33115 is a single-row tapered roller bearing with 75 mm bore, 125 mm outer diameter and 37 mm width (2.953 × 4.921 × 1.457 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 216 kN, C0 265 kN, fatigue load limit Pu 30 kN, reference speed 4,000 r/min, limiting speed 5,000 r/min, mass about 1800 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 33115 bore code work?", "a": "The last two digits of 33115 are bore code 15, so 15 × 5 = 75 mm bore. The 125 mm OD and 37 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 33115 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 31 is the ISO 355 series (light wide section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 33115 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 33115 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 33115 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "33115", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "33115" ], "locale_variants": {} }, { "sku": "33116", "brand": "SKF", "manufacturer_designation": "SKF 33116", "series": "33100-series", "type": "tapered_roller", "d_mm": 80, "D_mm": 130, "B_mm": 37, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 221, "static_load_kN": 280, "fatigue_load_limit_kN": 31, "max_rpm": 4800, "reference_speed_rpm": 4000, "limiting_speed_rpm": 4800, "weight_g": 1850, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "The SKF 33116 is a 80×130×37 mm single-row tapered roller bearing — the light wide section entry in the 33100 series, with an asymmetric raceway cut for thrust capacity and separable mounting.The code breaks down as type prefix 3 (tapered roller), series 31 (the light wide section), and bore code 16 = 80 mm; dimensions 80×130×37 mm therefore match the ISO 355 envelope. In SKF suffix language a bare 33116 is the standard execution; B marks a larger contact angle and Q or J2 mark clearance/cage variants, all quoted separately. Catalogue mass 1850 g for the 80×130×37 mm open execution covers the pressed-steel cage and standard roller complement; sealed or special-clearance variants differ slightly in mass and carry their own order numbers. A single 33116 locates the shaft in one axial direction only; mount it against a second bearing in O (back-to-back) or X (face-to-face) arrangement, and set the running clearance by the mounting procedure — not by feel.", "applications": [ "paper-machine and printing rolls", "construction machinery drives", "marine deck machinery shafts", "heavy industrial gearboxes and speed reducers" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting", "uneven load sharing in a pair when spacer faces are not parallel to the bore", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "rib-roller contact scoring from loss of the EP additive film" ], "pitfalls": [ "Mount the 80 mm bore 33116 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 331 series at 80 mm bore (130×37 mm) pairs a small OD with a wide section — a compact way to add capacity where radial space is tight; abutment and spacer widths differ from the 330/302 families, so it is not a drop-in swap.", "At the 221 kN rating of 33116, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 4,800 r/min speed end and heavier preload only where moment stiffness dominates.", "Do not mix brands or executions inside one 33116 pair — matched sets are ground for a specific setting, and pairing a SKF basic unit with a different suffix variant will not share the setting evenly.", "The 1850 g mass and 37 mm width mean spacer and abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the contact angle and concentrates load on one rib of 33116.", "The 221/280 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 33116 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 33116 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 33116?", "a": "The SKF 33116 is a single-row tapered roller bearing with 80 mm bore, 130 mm outer diameter and 37 mm width (3.15 × 5.118 × 1.457 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 221 kN, C0 280 kN, fatigue load limit Pu 31 kN, reference speed 4,000 r/min, limiting speed 4,800 r/min, mass about 1850 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 33116 bore code work?", "a": "The last two digits of 33116 are bore code 16, so 16 × 5 = 80 mm bore. The 130 mm OD and 37 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 33116 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 31 is the ISO 355 series (light wide section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 33116 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 33116 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 33116 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "33116", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "33116" ], "locale_variants": {} }, { "sku": "33117", "brand": "SKF", "manufacturer_designation": "SKF 33117", "series": "33100-series", "type": "tapered_roller", "d_mm": 85, "D_mm": 140, "B_mm": 41, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 268, "static_load_kN": 340, "fatigue_load_limit_kN": 38, "max_rpm": 4500, "reference_speed_rpm": 3600, "limiting_speed_rpm": 4500, "weight_g": 2450, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 33117 appears as SKF 33117: an open, single-row tapered roller bearing in the light wide section of the 33100 dimension series, supplied with a pressed-steel cage as standard.Reading the designation: the leading 3 marks a single-row tapered roller bearing, the 31 is the ISO 355 diameter/width series (light wide section), and the last two digits encode the 85 mm bore; the 140 mm OD and 41 mm width follow the ISO 355 general plan. In SKF suffix language a bare 33117 is the standard execution; B marks a larger contact angle and Q or J2 mark clearance/cage variants, all quoted separately. At 3,600 r/min reference speed the 27.5 mm-section 33117 is governed thermally by preload and lubricant flow; grease or oil selection should be made against that value, with 4,500 r/min as the mechanical ceiling. Note the minimum-axial-load requirement: at light radial load and high speed the rollers of 33117 must still be held into the rib contact, which is another reason the catalogue recommends paired mounting with controlled setting.", "applications": [ "marine deck machinery shafts", "heavy industrial gearboxes and speed reducers", "large process pump and compressor shafts", "rolling-mill auxiliary drives" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "false brinelling on idle paired sets exposed to machine vibration", "roller large-end smearing against the cone rib after EP lubricant film failure", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "hard-particle indentation of the tapered raceway in unfiltered oil" ], "pitfalls": [ "Mount the 85 mm bore 33117 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 331 series at 85 mm bore (140×41 mm) pairs a small OD with a wide section — a compact way to add capacity where radial space is tight; abutment and spacer widths differ from the 330/302 families, so it is not a drop-in swap.", "When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 33117 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.", "O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 33117 mounting error.", "Open 33117 units need application-supplied sealing and a defined EP lubricant supply; the roller-rib contact is the first to fail when the additive film breaks down.", "The 268/340 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 33117 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 33117 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 33117?", "a": "The SKF 33117 is a single-row tapered roller bearing with 85 mm bore, 140 mm outer diameter and 41 mm width (3.346 × 5.512 × 1.614 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 268 kN, C0 340 kN, fatigue load limit Pu 38 kN, reference speed 3,600 r/min, limiting speed 4,500 r/min, mass about 2450 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 33117 bore code work?", "a": "The last two digits of 33117 are bore code 17, so 17 × 5 = 85 mm bore. The 140 mm OD and 41 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 33117 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 31 is the ISO 355 series (light wide section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 33117 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 33117 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 33117 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "33117", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "33117" ], "locale_variants": {} }, { "sku": "33118", "brand": "SKF", "manufacturer_designation": "SKF 33118", "series": "33100-series", "type": "tapered_roller", "d_mm": 90, "D_mm": 150, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 310, "static_load_kN": 390, "fatigue_load_limit_kN": 43, "max_rpm": 4300, "reference_speed_rpm": 3400, "limiting_speed_rpm": 4300, "weight_g": 3100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "SKF 33118 belongs to the SKF single-row tapered roller range — the 90 mm bore entry in the 33100 series, dimensioned 150 mm OD and 45 mm wide to the ISO 355 boundary plan.Digit by digit, 33118 reads as bearing type 3 (single-row tapered roller), light wide section series 31, and bore reference 18 resolving to 90 mm; 150 mm OD and 45 mm width are the matching ISO 355 boundary values. In SKF suffix language a bare 33118 is the standard execution; B marks a larger contact angle and Q or J2 mark clearance/cage variants, all quoted separately. Speed planning uses two different ceilings: 3,400 r/min thermal reference and 4,300 r/min mechanical limiting speed. Specify pairs rather than single units wherever thrust reverses: the tapered contact of 33118 generates an induced axial load under radial force, and an unpaired bearing on a reversing shaft will run slack and fret its seat.", "applications": [ "large process pump and compressor shafts", "rolling-mill auxiliary drives", "crane sheave and hoist gearboxes", "paper-machine and printing rolls" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "axial overload spalling at the roller-rib contact beyond the single-row thrust rating", "preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Mount the 90 mm bore 33118 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 331 series at 90 mm bore (150×45 mm) pairs a small OD with a wide section — a compact way to add capacity where radial space is tight; abutment and spacer widths differ from the 330/302 families, so it is not a drop-in swap.", "Do not mix brands or executions inside one 33118 pair — matched sets are ground for a specific setting, and pairing a SKF basic unit with a different suffix variant will not share the setting evenly.", "The tapered contact angle creates an induced axial load under pure radial force; include it in the 33118 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.", "Shaft and housing fillets must clear the bearing chamfer so the 45 mm-wide cup seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 310/390 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 33118 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 33118 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 33118?", "a": "The SKF 33118 is a single-row tapered roller bearing with 90 mm bore, 150 mm outer diameter and 45 mm width (3.543 × 5.906 × 1.772 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 310 kN, C0 390 kN, fatigue load limit Pu 43 kN, reference speed 3,400 r/min, limiting speed 4,300 r/min, mass about 3100 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 33118 bore code work?", "a": "The last two digits of 33118 are bore code 18, so 18 × 5 = 90 mm bore. The 150 mm OD and 45 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 33118 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 31 is the ISO 355 series (light wide section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 33118 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 33118 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 33118 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "33118", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "33118" ], "locale_variants": {} }, { "sku": "33122", "brand": "SKF", "manufacturer_designation": "SKF 33122", "series": "33100-series", "type": "tapered_roller", "d_mm": 110, "D_mm": 180, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 455, "static_load_kN": 630, "fatigue_load_limit_kN": 65.5, "max_rpm": 3400, "reference_speed_rpm": 2800, "limiting_speed_rpm": 3400, "weight_g": 5500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "33122 is a single-row tapered roller bearing in the ISO 33100 dimension series: a separable cone-and-cup design for combined radial and one-direction axial load, listed by SKF in SKF catalogue PUB BU/P1 17000.Numbering ties the bearing to its envelope: 33122 means tapered-roller type 3, light wide section series 31, 110 mm bore — which is why the 180×56 mm outline swaps dimensionally with other ISO 355 bearings of the same code. In SKF suffix language a bare 33122 is the standard execution; B marks a larger contact angle and Q or J2 mark clearance/cage variants, all quoted separately. Catalogue mass 5500 g for the 110×180×56 mm open execution covers the pressed-steel cage and standard roller complement; sealed or special-clearance variants differ slightly in mass and carry their own order numbers. Specify pairs rather than single units wherever thrust reverses: the tapered contact of 33122 generates an induced axial load under radial force, and an unpaired bearing on a reversing shaft will run slack and fret its seat.", "applications": [ "paper-machine and printing rolls", "construction machinery drives", "marine deck machinery shafts", "heavy industrial gearboxes and speed reducers" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "uneven load sharing in a pair when spacer faces are not parallel to the bore", "thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount the 110 mm bore 33122 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 331 series at 110 mm bore (180×56 mm) pairs a small OD with a wide section — a compact way to add capacity where radial space is tight; abutment and spacer widths differ from the 330/302 families, so it is not a drop-in swap.", "Setting is a design value, not an assembly feel: excessive preload in the 33122 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.", "A single 33122 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use an O or X matched pair for bidirectional location.", "Open 33122 units need application-supplied sealing and a defined EP lubricant supply; the roller-rib contact is the first to fail when the additive film breaks down.", "The 455/630 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 33122 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 33122 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 33122?", "a": "The SKF 33122 is a single-row tapered roller bearing with 110 mm bore, 180 mm outer diameter and 56 mm width (4.331 × 7.087 × 2.205 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 455 kN, C0 630 kN, fatigue load limit Pu 65.5 kN, reference speed 2,800 r/min, limiting speed 3,400 r/min, mass about 5500 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 33122 bore code work?", "a": "The last two digits of 33122 are bore code 22, so 22 × 5 = 110 mm bore. The 180 mm OD and 56 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 33122 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 31 is the ISO 355 series (light wide section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 33122 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 33122 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 33122 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "33122", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "33122" ], "locale_variants": {} }, { "sku": "33205", "brand": "SKF", "manufacturer_designation": "SKF 33205", "series": "33200-series", "type": "tapered_roller", "d_mm": 25, "D_mm": 52, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 57.9, "static_load_kN": 56, "fatigue_load_limit_kN": 6, "max_rpm": 13000, "reference_speed_rpm": 10000, "limiting_speed_rpm": 13000, "weight_g": 220, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "Ordering number SKF 33205 in SKF catalogue PUB BU/P1 17000 denotes a single-row tapered roller bearing for a 25 mm shaft, medium wide section, with an open pressed-steel-cage execution and one-direction axial capacity.Reading the designation: the leading 3 marks a single-row tapered roller bearing, the 32 is the ISO 355 diameter/width series (medium wide section), and the last two digits encode the 25 mm bore; the 52 mm OD and 22 mm width follow the ISO 355 general plan. In SKF suffix language a bare 33205 is the standard execution; B marks a larger contact angle and Q or J2 mark clearance/cage variants, all quoted separately. Selection arithmetic: the C0/C ratio is about 0.97 (static 56 kN against dynamic 57.9 kN), typical of a tapered roller sized for axial capacity, and the 6 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. A single 33205 locates the shaft in one axial direction only; mount it against a second bearing in O (back-to-back) or X (face-to-face) arrangement, and set the running clearance by the mounting procedure — not by feel.", "applications": [ "small automotive wheel hubs and trailer axles", "light-duty gearbox input/output shafts", "electric-motor pinion shafts", "steering knuckles and small differentials" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways", "axial overload spalling at the roller-rib contact beyond the single-row thrust rating", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "brinelling from pressing the cone or cup home through the rollers" ], "pitfalls": [ "At a 25 mm bore the thin cone and cup are easily distorted by an over-tight shaft nut; check seat runout (target Ra ≤ 0.8 µm) and torque the locknut progressively — a pinched 33205 shows up as gearbox vibration long before it fails.", "The 332 series at 25 mm bore (52×22 mm) is the wide medium-section choice — more capacity than 30205 in the same OD class but a wider footprint; re-check housing width and pair setting before substituting.", "When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 33205 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.", "When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 33205 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.", "The 33205 shares its ISO 355 envelope with other tapered bearings of the same code but is not a drop-in replacement for a ball bearing: it cannot run effectively under pure radial load without a minimum axial load, and a deep-groove bearing cannot replace its combined-load duty.", "The 57.9/56 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 33205 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 33205 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 33205?", "a": "The SKF 33205 is a single-row tapered roller bearing with 25 mm bore, 52 mm outer diameter and 22 mm width (0.984 × 2.047 × 0.866 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 57.9 kN, C0 56 kN, fatigue load limit Pu 6 kN, reference speed 10,000 r/min, limiting speed 13,000 r/min, mass about 220 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 33205 bore code work?", "a": "The last two digits of 33205 are bore code 05, so 05 × 5 = 25 mm bore. The 52 mm OD and 22 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 33205 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 32 is the ISO 355 series (medium wide section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 33205 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 33205 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 33205 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "33205-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×52×22 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "33205", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "33205" ], "locale_variants": {} }, { "sku": "33206", "brand": "SKF", "manufacturer_designation": "SKF 33206", "series": "33200-series", "type": "tapered_roller", "d_mm": 30, "D_mm": 62, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 79.7, "static_load_kN": 76.5, "fatigue_load_limit_kN": 8.5, "max_rpm": 11000, "reference_speed_rpm": 8500, "limiting_speed_rpm": 11000, "weight_g": 350, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "33206 is a single-row tapered roller bearing in the ISO 33200 dimension series: a separable cone-and-cup design for combined radial and one-direction axial load, listed by SKF in SKF catalogue PUB BU/P1 17000.Digit by digit, 33206 reads as bearing type 3 (single-row tapered roller), medium wide section series 32, and bore reference 06 resolving to 30 mm; 62 mm OD and 25 mm width are the matching ISO 355 boundary values. In SKF suffix language a bare 33206 is the standard execution; B marks a larger contact angle and Q or J2 mark clearance/cage variants, all quoted separately. The 16.0 mm radial section height ((62−30)/2) and 350 g catalogue mass frame a 30 mm bore bearing rated at 79.7 kN C — roughly 2.66 kN of dynamic capacity per millimetre of bore before application factors. Note the minimum-axial-load requirement: at light radial load and high speed the rollers of 33206 must still be held into the rib contact, which is another reason the catalogue recommends paired mounting with controlled setting.", "applications": [ "differential and pinion drives", "pump and compressor shafts", "machine-tool spindles", "belt-driven fan and blower shafts" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting", "uneven load sharing in a pair when spacer faces are not parallel to the bore", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "On this 30 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 33206 pair heats, loses setting control and smears the roller-rib contact.", "The 332 series at 30 mm bore (62×25 mm) is the wide medium-section choice — more capacity than 30206 in the same OD class but a wider footprint; re-check housing width and pair setting before substituting.", "Do not mix brands or executions inside one 33206 pair — matched sets are ground for a specific setting, and pairing a SKF basic unit with a different suffix variant will not share the setting evenly.", "Do not mix brands or executions inside one 33206 pair — matched sets are ground for a specific setting, and pairing a SKF basic unit with a different suffix variant will not share the setting evenly.", "Never press both rings through the wrong element during fitting: force for an interference shaft seat goes through the cone only, or brinell marks on the 62 mm cup race release as noise within the first running hours.", "The 79.7/76.5 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 33206 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 33206 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 33206?", "a": "The SKF 33206 is a single-row tapered roller bearing with 30 mm bore, 62 mm outer diameter and 25 mm width (1.181 × 2.441 × 0.984 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 79.7 kN, C0 76.5 kN, fatigue load limit Pu 8.5 kN, reference speed 8,500 r/min, limiting speed 11,000 r/min, mass about 350 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 33206 bore code work?", "a": "The last two digits of 33206 are bore code 06, so 06 × 5 = 30 mm bore. The 62 mm OD and 25 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 33206 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 32 is the ISO 355 series (medium wide section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 33206 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 33206 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 33206 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "33206-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×62×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "33206", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "33206" ], "locale_variants": {} }, { "sku": "33207", "brand": "SKF", "manufacturer_designation": "SKF 33207", "series": "33200-series", "type": "tapered_roller", "d_mm": 35, "D_mm": 72, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 104, "static_load_kN": 106, "fatigue_load_limit_kN": 11.8, "max_rpm": 9500, "reference_speed_rpm": 7000, "limiting_speed_rpm": 9500, "weight_g": 530, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "The SKF 33207 is a 35×72×28 mm single-row tapered roller bearing — the medium wide section entry in the 33200 series, with an asymmetric raceway cut for thrust capacity and separable mounting.Numbering ties the bearing to its envelope: 33207 means tapered-roller type 3, medium wide section series 32, 35 mm bore — which is why the 72×28 mm outline swaps dimensionally with other ISO 355 bearings of the same code. In SKF suffix language a bare 33207 is the standard execution; B marks a larger contact angle and Q or J2 mark clearance/cage variants, all quoted separately. Catalogue mass 530 g for the 35×72×28 mm open execution covers the pressed-steel cage and standard roller complement; sealed or special-clearance variants differ slightly in mass and carry their own order numbers. Specify pairs rather than single units wherever thrust reverses: the tapered contact of 33207 generates an induced axial load under radial force, and an unpaired bearing on a reversing shaft will run slack and fret its seat.", "applications": [ "machine-tool spindles", "belt-driven fan and blower shafts", "axle-boxes in material-handling equipment", "automotive and light-truck wheel hubs" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "false brinelling on idle paired sets exposed to machine vibration", "roller large-end smearing against the cone rib after EP lubricant film failure", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "grease degradation after long shelf storage without rotation or re-greasing" ], "pitfalls": [ "On this 35 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 33207 pair heats, loses setting control and smears the roller-rib contact.", "The 332 series at 35 mm bore (72×28 mm) is the wide medium-section choice — more capacity than 30207 in the same OD class but a wider footprint; re-check housing width and pair setting before substituting.", "O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 33207 mounting error.", "O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 33207 mounting error.", "The pressed-steel cage is rated for standard industrial service; sustained running above the limiting speed or with degraded lubricant wears the cage pockets — inspect the cage at every relubrication interval.", "The 104/106 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 33207 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 33207 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 33207?", "a": "The SKF 33207 is a single-row tapered roller bearing with 35 mm bore, 72 mm outer diameter and 28 mm width (1.378 × 2.835 × 1.102 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 104 kN, C0 106 kN, fatigue load limit Pu 11.8 kN, reference speed 7,000 r/min, limiting speed 9,500 r/min, mass about 530 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 33207 bore code work?", "a": "The last two digits of 33207 are bore code 07, so 07 × 5 = 35 mm bore. The 72 mm OD and 28 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 33207 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 32 is the ISO 355 series (medium wide section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 33207 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 33207 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 33207 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "33207-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "33207", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "33207" ], "locale_variants": {} }, { "sku": "33208", "brand": "SKF", "manufacturer_designation": "SKF 33208", "series": "33200-series", "type": "tapered_roller", "d_mm": 40, "D_mm": 80, "B_mm": 32, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 128, "static_load_kN": 132, "fatigue_load_limit_kN": 15, "max_rpm": 8500, "reference_speed_rpm": 6300, "limiting_speed_rpm": 8500, "weight_g": 730, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 33208 appears as SKF 33208: an open, single-row tapered roller bearing in the medium wide section of the 33200 dimension series, supplied with a pressed-steel cage as standard.On the SKF nameplate, 33208 follows the ISO 355 convention: 3 for the tapered-roller type, 32 for the medium wide section, final digits 08 for the 40 mm bore. In SKF suffix language a bare 33208 is the standard execution; B marks a larger contact angle and Q or J2 mark clearance/cage variants, all quoted separately. At 6,300 r/min reference speed the 20.0 mm-section 33208 is governed thermally by preload and lubricant flow; grease or oil selection should be made against that value, with 8,500 r/min as the mechanical ceiling. Because the contact line is tapered, one 33208 reacts thrust in a single direction; bidirectional shafts need an O or X pair, and a rotating cone on a 40 mm shaft typically takes a k5 seat with an H7 housing bore.", "applications": [ "axle-boxes in material-handling equipment", "automotive and light-truck wheel hubs", "industrial gearbox shafts and reducers", "differential and pinion drives" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "axial overload spalling at the roller-rib contact beyond the single-row thrust rating", "preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "mounting score marks when the cone is cocked over the shaft keyway or a burr" ], "pitfalls": [ "On this 40 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 33208 pair heats, loses setting control and smears the roller-rib contact.", "The 332 series at 40 mm bore (80×32 mm) is the wide medium-section choice — more capacity than 30208 in the same OD class but a wider footprint; re-check housing width and pair setting before substituting.", "The tapered contact angle creates an induced axial load under pure radial force; include it in the 33208 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.", "The tapered contact angle creates an induced axial load under pure radial force; include it in the 33208 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.", "The 730 g mass and 32 mm width mean spacer and abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the contact angle and concentrates load on one rib of 33208.", "The 128/132 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 33208 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 33208 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 33208?", "a": "The SKF 33208 is a single-row tapered roller bearing with 40 mm bore, 80 mm outer diameter and 32 mm width (1.575 × 3.15 × 1.26 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 128 kN, C0 132 kN, fatigue load limit Pu 15 kN, reference speed 6,300 r/min, limiting speed 8,500 r/min, mass about 730 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 33208 bore code work?", "a": "The last two digits of 33208 are bore code 08, so 08 × 5 = 40 mm bore. The 80 mm OD and 32 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 33208 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 32 is the ISO 355 series (medium wide section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 33208 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 33208 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 33208 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "33208-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×80×32 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "33208", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "33208" ], "locale_variants": {} }, { "sku": "33209", "brand": "SKF", "manufacturer_designation": "SKF 33209", "series": "33200-series", "type": "tapered_roller", "d_mm": 45, "D_mm": 85, "B_mm": 32, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 132, "static_load_kN": 143, "fatigue_load_limit_kN": 16.3, "max_rpm": 7500, "reference_speed_rpm": 6000, "limiting_speed_rpm": 7500, "weight_g": 790, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "SKF 33209 belongs to the SKF single-row tapered roller range — the 45 mm bore entry in the 33200 series, dimensioned 85 mm OD and 32 mm wide to the ISO 355 boundary plan.The code breaks down as type prefix 3 (tapered roller), series 32 (the medium wide section), and bore code 09 = 45 mm; dimensions 45×85×32 mm therefore match the ISO 355 envelope. In SKF suffix language a bare 33209 is the standard execution; B marks a larger contact angle and Q or J2 mark clearance/cage variants, all quoted separately. Speed planning uses two different ceilings: 6,000 r/min thermal reference and 7,500 r/min mechanical limiting speed. For a 45 mm shaft the usual cone seat is k5 with an H7 housing when the inner ring rotates; arrange two 33209 bearings as a set for two-direction location and set clearance from the load diagram, never from assembly feel.", "applications": [ "industrial gearbox shafts and reducers", "differential and pinion drives", "pump and compressor shafts", "machine-tool spindles" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "uneven load sharing in a pair when spacer faces are not parallel to the bore", "thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "rib-roller contact scoring from loss of the EP additive film" ], "pitfalls": [ "On this 45 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 33209 pair heats, loses setting control and smears the roller-rib contact.", "The 332 series at 45 mm bore (85×32 mm) is the wide medium-section choice — more capacity than 30209 in the same OD class but a wider footprint; re-check housing width and pair setting before substituting.", "Setting is a design value, not an assembly feel: excessive preload in the 33209 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.", "Setting is a design value, not an assembly feel: excessive preload in the 33209 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.", "Open 33209 units need application-supplied sealing and a defined EP lubricant supply; the roller-rib contact is the first to fail when the additive film breaks down.", "The 132/143 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 33209 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 33209 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 33209?", "a": "The SKF 33209 is a single-row tapered roller bearing with 45 mm bore, 85 mm outer diameter and 32 mm width (1.772 × 3.346 × 1.26 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 132 kN, C0 143 kN, fatigue load limit Pu 16.3 kN, reference speed 6,000 r/min, limiting speed 7,500 r/min, mass about 790 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 33209 bore code work?", "a": "The last two digits of 33209 are bore code 09, so 09 × 5 = 45 mm bore. The 85 mm OD and 32 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 33209 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 32 is the ISO 355 series (medium wide section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 33209 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 33209 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 33209 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "33209-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×85×32 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "33209", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "33209" ], "locale_variants": {} }, { "sku": "33210", "brand": "SKF", "manufacturer_designation": "SKF 33210", "series": "33200-series", "type": "tapered_roller", "d_mm": 50, "D_mm": 90, "B_mm": 32, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 142, "static_load_kN": 160, "fatigue_load_limit_kN": 18.3, "max_rpm": 7000, "reference_speed_rpm": 5300, "limiting_speed_rpm": 7000, "weight_g": 860, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "For a 50 mm shaft carrying combined load, SKF lists 33210 under catalogue execution SKF 33210: one open single-row tapered roller bearing in the medium wide section of the 33200 family.Numbering ties the bearing to its envelope: 33210 means tapered-roller type 3, medium wide section series 32, 50 mm bore — which is why the 90×32 mm outline swaps dimensionally with other ISO 355 bearings of the same code. In SKF suffix language a bare 33210 is the standard execution; B marks a larger contact angle and Q or J2 mark clearance/cage variants, all quoted separately. The 18.3 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.13 C0/C balance shows this execution is tuned to thrust-heavy combined loads rather than pure radial running. Note the minimum-axial-load requirement: at light radial load and high speed the rollers of 33210 must still be held into the rib contact, which is another reason the catalogue recommends paired mounting with controlled setting.", "applications": [ "belt-driven fan and blower shafts", "axle-boxes in material-handling equipment", "automotive and light-truck wheel hubs", "industrial gearbox shafts and reducers" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "false brinelling on idle paired sets exposed to machine vibration", "roller large-end smearing against the cone rib after EP lubricant film failure", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "grease degradation after long shelf storage without rotation or re-greasing" ], "pitfalls": [ "On this 50 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 33210 pair heats, loses setting control and smears the roller-rib contact.", "The 332 series at 50 mm bore (90×32 mm) is the wide medium-section choice — more capacity than 30210 in the same OD class but a wider footprint; re-check housing width and pair setting before substituting.", "Setting is a design value, not an assembly feel: excessive preload in the 33210 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.", "The tapered contact angle creates an induced axial load under pure radial force; include it in the 33210 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.", "The 33210 shares its ISO 355 envelope with other tapered bearings of the same code but is not a drop-in replacement for a ball bearing: it cannot run effectively under pure radial load without a minimum axial load, and a deep-groove bearing cannot replace its combined-load duty.", "The 142/160 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 33210 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 33210 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 33210?", "a": "The SKF 33210 is a single-row tapered roller bearing with 50 mm bore, 90 mm outer diameter and 32 mm width (1.969 × 3.543 × 1.26 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 142 kN, C0 160 kN, fatigue load limit Pu 18.3 kN, reference speed 5,300 r/min, limiting speed 7,000 r/min, mass about 860 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 33210 bore code work?", "a": "The last two digits of 33210 are bore code 10, so 10 × 5 = 50 mm bore. The 90 mm OD and 32 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 33210 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 32 is the ISO 355 series (medium wide section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 33210 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 33210 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 33210 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "33210-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×90×32 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "33210", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "33210" ], "locale_variants": {} }, { "sku": "33211", "brand": "SKF", "manufacturer_designation": "SKF 33211", "series": "33200-series", "type": "tapered_roller", "d_mm": 55, "D_mm": 100, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 170, "static_load_kN": 190, "fatigue_load_limit_kN": 21.6, "max_rpm": 6300, "reference_speed_rpm": 4800, "limiting_speed_rpm": 6300, "weight_g": 1150, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "SKF 33211 (SKF 33211) is the medium wide section tapered roller choice for a 55 mm shaft — one row of tapered rollers on an asymmetric raceway inside the 100×35 mm ISO 355 envelope.On the SKF nameplate, 33211 follows the ISO 355 convention: 3 for the tapered-roller type, 32 for the medium wide section, final digits 11 for the 55 mm bore. In SKF suffix language a bare 33211 is the standard execution; B marks a larger contact angle and Q or J2 mark clearance/cage variants, all quoted separately. Selection arithmetic: the C0/C ratio is about 1.12 (static 190 kN against dynamic 170 kN), typical of a tapered roller sized for axial capacity, and the 21.6 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Specify pairs rather than single units wherever thrust reverses: the tapered contact of 33211 generates an induced axial load under radial force, and an unpaired bearing on a reversing shaft will run slack and fret its seat.", "applications": [ "automotive and light-truck wheel hubs", "industrial gearbox shafts and reducers", "differential and pinion drives", "pump and compressor shafts" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "axial overload spalling at the roller-rib contact beyond the single-row thrust rating", "preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "mounting score marks when the cone is cocked over the shaft keyway or a burr" ], "pitfalls": [ "On this 55 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 33211 pair heats, loses setting control and smears the roller-rib contact.", "The 332 series at 55 mm bore (100×35 mm) is the wide medium-section choice — more capacity than 30211 in the same OD class but a wider footprint; re-check housing width and pair setting before substituting.", "A single 33211 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use an O or X matched pair for bidirectional location.", "Setting is a design value, not an assembly feel: excessive preload in the 33211 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.", "Never press both rings through the wrong element during fitting: force for an interference shaft seat goes through the cone only, or brinell marks on the 100 mm cup race release as noise within the first running hours.", "The 170/190 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 33211 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 33211 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 33211?", "a": "The SKF 33211 is a single-row tapered roller bearing with 55 mm bore, 100 mm outer diameter and 35 mm width (2.165 × 3.937 × 1.378 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 170 kN, C0 190 kN, fatigue load limit Pu 21.6 kN, reference speed 4,800 r/min, limiting speed 6,300 r/min, mass about 1150 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 33211 bore code work?", "a": "The last two digits of 33211 are bore code 11, so 11 × 5 = 55 mm bore. The 100 mm OD and 35 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 33211 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 32 is the ISO 355 series (medium wide section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 33211 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 33211 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 33211 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "33211-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×100×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "33211", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "33211" ], "locale_variants": {} }, { "sku": "33212", "brand": "SKF", "manufacturer_designation": "SKF 33212", "series": "33200-series", "type": "tapered_roller", "d_mm": 60, "D_mm": 110, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 207, "static_load_kN": 236, "fatigue_load_limit_kN": 26.5, "max_rpm": 6000, "reference_speed_rpm": 4500, "limiting_speed_rpm": 6000, "weight_g": 1550, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "Ordering number SKF 33212 in SKF catalogue PUB BU/P1 17000 denotes a single-row tapered roller bearing for a 60 mm shaft, medium wide section, with an open pressed-steel-cage execution and one-direction axial capacity.The code breaks down as type prefix 3 (tapered roller), series 32 (the medium wide section), and bore code 12 = 60 mm; dimensions 60×110×38 mm therefore match the ISO 355 envelope. In SKF suffix language a bare 33212 is the standard execution; B marks a larger contact angle and Q or J2 mark clearance/cage variants, all quoted separately. The 25.0 mm radial section height ((110−60)/2) and 1550 g catalogue mass frame a 60 mm bore bearing rated at 207 kN C — roughly 3.45 kN of dynamic capacity per millimetre of bore before application factors. Because the contact line is tapered, one 33212 reacts thrust in a single direction; bidirectional shafts need an O or X pair, and a rotating cone on a 60 mm shaft typically takes a k5 seat with an H7 housing bore.", "applications": [ "rolling-mill auxiliary drives", "crane sheave and hoist gearboxes", "paper-machine and printing rolls", "construction machinery drives" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "uneven load sharing in a pair when spacer faces are not parallel to the bore", "thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "rib-roller contact scoring from loss of the EP additive film" ], "pitfalls": [ "Mount the 60 mm bore 33212 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 332 series at 60 mm bore (110×38 mm) is the wide medium-section choice — more capacity than 30212 in the same OD class but a wider footprint; re-check housing width and pair setting before substituting.", "At the 207 kN rating of 33212, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 6,000 r/min speed end and heavier preload only where moment stiffness dominates.", "A single 33212 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use an O or X matched pair for bidirectional location.", "The pressed-steel cage is rated for standard industrial service; sustained running above the limiting speed or with degraded lubricant wears the cage pockets — inspect the cage at every relubrication interval.", "The 207/236 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 33212 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 33212 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 33212?", "a": "The SKF 33212 is a single-row tapered roller bearing with 60 mm bore, 110 mm outer diameter and 38 mm width (2.362 × 4.331 × 1.496 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 207 kN, C0 236 kN, fatigue load limit Pu 26.5 kN, reference speed 4,500 r/min, limiting speed 6,000 r/min, mass about 1550 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 33212 bore code work?", "a": "The last two digits of 33212 are bore code 12, so 12 × 5 = 60 mm bore. The 110 mm OD and 38 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 33212 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 32 is the ISO 355 series (medium wide section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 33212 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 33212 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 33212 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "33212", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "33212" ], "locale_variants": {} }, { "sku": "33213", "brand": "SKF", "manufacturer_designation": "SKF 33213", "series": "33200-series", "type": "tapered_roller", "d_mm": 65, "D_mm": 120, "B_mm": 41, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 239, "static_load_kN": 270, "fatigue_load_limit_kN": 30.5, "max_rpm": 5300, "reference_speed_rpm": 4000, "limiting_speed_rpm": 5300, "weight_g": 2000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "33213 is a single-row tapered roller bearing in the ISO 33200 dimension series: a separable cone-and-cup design for combined radial and one-direction axial load, listed by SKF in SKF catalogue PUB BU/P1 17000.Reading the designation: the leading 3 marks a single-row tapered roller bearing, the 32 is the ISO 355 diameter/width series (medium wide section), and the last two digits encode the 65 mm bore; the 120 mm OD and 41 mm width follow the ISO 355 general plan. In SKF suffix language a bare 33213 is the standard execution; B marks a larger contact angle and Q or J2 mark clearance/cage variants, all quoted separately. Catalogue mass 2000 g for the 65×120×41 mm open execution covers the pressed-steel cage and standard roller complement; sealed or special-clearance variants differ slightly in mass and carry their own order numbers. For a 65 mm shaft the usual cone seat is k5 with an H7 housing when the inner ring rotates; arrange two 33213 bearings as a set for two-direction location and set clearance from the load diagram, never from assembly feel.", "applications": [ "paper-machine and printing rolls", "construction machinery drives", "marine deck machinery shafts", "heavy industrial gearboxes and speed reducers" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "roller large-end smearing against the cone rib after EP lubricant film failure", "false brinelling on idle paired sets exposed to machine vibration", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "hard-particle indentation of the tapered raceway in unfiltered oil" ], "pitfalls": [ "Mount the 65 mm bore 33213 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 332 series at 65 mm bore (120×41 mm) is the wide medium-section choice — more capacity than 30213 in the same OD class but a wider footprint; re-check housing width and pair setting before substituting.", "When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 33213 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.", "At the 239 kN rating of 33213, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 5,300 r/min speed end and heavier preload only where moment stiffness dominates.", "The 2000 g mass and 41 mm width mean spacer and abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the contact angle and concentrates load on one rib of 33213.", "The 239/270 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 33213 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 33213 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 33213?", "a": "The SKF 33213 is a single-row tapered roller bearing with 65 mm bore, 120 mm outer diameter and 41 mm width (2.559 × 4.724 × 1.614 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 239 kN, C0 270 kN, fatigue load limit Pu 30.5 kN, reference speed 4,000 r/min, limiting speed 5,300 r/min, mass about 2000 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 33213 bore code work?", "a": "The last two digits of 33213 are bore code 13, so 13 × 5 = 65 mm bore. The 120 mm OD and 41 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 33213 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 32 is the ISO 355 series (medium wide section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 33213 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 33213 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 33213 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "33213", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "33213" ], "locale_variants": {} }, { "sku": "33214", "brand": "SKF", "manufacturer_designation": "SKF 33214", "series": "33200-series", "type": "tapered_roller", "d_mm": 70, "D_mm": 125, "B_mm": 41, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 247, "static_load_kN": 285, "fatigue_load_limit_kN": 32.5, "max_rpm": 5000, "reference_speed_rpm": 3800, "limiting_speed_rpm": 5000, "weight_g": 2100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "The SKF 33214 is a 70×125×41 mm single-row tapered roller bearing — the medium wide section entry in the 33200 series, with an asymmetric raceway cut for thrust capacity and separable mounting.Digit by digit, 33214 reads as bearing type 3 (single-row tapered roller), medium wide section series 32, and bore reference 14 resolving to 70 mm; 125 mm OD and 41 mm width are the matching ISO 355 boundary values. In SKF suffix language a bare 33214 is the standard execution; B marks a larger contact angle and Q or J2 mark clearance/cage variants, all quoted separately. At 3,800 r/min reference speed the 27.5 mm-section 33214 is governed thermally by preload and lubricant flow; grease or oil selection should be made against that value, with 5,000 r/min as the mechanical ceiling. Mounting practice for 33214: the rotating cone takes the interference fit (k5 on a 70 mm shaft), the cup slides for axial location, and reversing-thrust duty demands a paired O/X set rather than one bearing.", "applications": [ "marine deck machinery shafts", "heavy industrial gearboxes and speed reducers", "large process pump and compressor shafts", "rolling-mill auxiliary drives" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways", "axial overload spalling at the roller-rib contact beyond the single-row thrust rating", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Mount the 70 mm bore 33214 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 332 series at 70 mm bore (125×41 mm) is the wide medium-section choice — more capacity than 30214 in the same OD class but a wider footprint; re-check housing width and pair setting before substituting.", "Do not mix brands or executions inside one 33214 pair — matched sets are ground for a specific setting, and pairing a SKF basic unit with a different suffix variant will not share the setting evenly.", "When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 33214 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.", "Open 33214 units need application-supplied sealing and a defined EP lubricant supply; the roller-rib contact is the first to fail when the additive film breaks down.", "The 247/285 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 33214 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 33214 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 33214?", "a": "The SKF 33214 is a single-row tapered roller bearing with 70 mm bore, 125 mm outer diameter and 41 mm width (2.756 × 4.921 × 1.614 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 247 kN, C0 285 kN, fatigue load limit Pu 32.5 kN, reference speed 3,800 r/min, limiting speed 5,000 r/min, mass about 2100 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 33214 bore code work?", "a": "The last two digits of 33214 are bore code 14, so 14 × 5 = 70 mm bore. The 125 mm OD and 41 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 33214 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 32 is the ISO 355 series (medium wide section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 33214 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 33214 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 33214 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "33214", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "33214" ], "locale_variants": {} }, { "sku": "33215", "brand": "SKF", "manufacturer_designation": "SKF 33215", "series": "33200-series", "type": "tapered_roller", "d_mm": 75, "D_mm": 130, "B_mm": 41, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 255, "static_load_kN": 300, "fatigue_load_limit_kN": 34, "max_rpm": 4800, "reference_speed_rpm": 3600, "limiting_speed_rpm": 4800, "weight_g": 2200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 33215 appears as SKF 33215: an open, single-row tapered roller bearing in the medium wide section of the 33200 dimension series, supplied with a pressed-steel cage as standard.Numbering ties the bearing to its envelope: 33215 means tapered-roller type 3, medium wide section series 32, 75 mm bore — which is why the 130×41 mm outline swaps dimensionally with other ISO 355 bearings of the same code. In SKF suffix language a bare 33215 is the standard execution; B marks a larger contact angle and Q or J2 mark clearance/cage variants, all quoted separately. Speed planning uses two different ceilings: 3,600 r/min thermal reference and 4,800 r/min mechanical limiting speed. Fit selection follows the rotating ring — interference on a rotating cone — and two 33215 units are required to take reversing thrust; keep the induced axial load inside the rated capacity when calculating the pair.", "applications": [ "large process pump and compressor shafts", "rolling-mill auxiliary drives", "crane sheave and hoist gearboxes", "paper-machine and printing rolls" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting", "uneven load sharing in a pair when spacer faces are not parallel to the bore", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "edge loading from shaft deflection or housing misalignment" ], "pitfalls": [ "Mount the 75 mm bore 33215 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 332 series at 75 mm bore (130×41 mm) is the wide medium-section choice — more capacity than 30215 in the same OD class but a wider footprint; re-check housing width and pair setting before substituting.", "O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 33215 mounting error.", "Do not mix brands or executions inside one 33215 pair — matched sets are ground for a specific setting, and pairing a SKF basic unit with a different suffix variant will not share the setting evenly.", "Shaft and housing fillets must clear the bearing chamfer so the 41 mm-wide cup seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 255/300 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 33215 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 33215 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 33215?", "a": "The SKF 33215 is a single-row tapered roller bearing with 75 mm bore, 130 mm outer diameter and 41 mm width (2.953 × 5.118 × 1.614 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 255 kN, C0 300 kN, fatigue load limit Pu 34 kN, reference speed 3,600 r/min, limiting speed 4,800 r/min, mass about 2200 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 33215 bore code work?", "a": "The last two digits of 33215 are bore code 15, so 15 × 5 = 75 mm bore. The 130 mm OD and 41 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 33215 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 32 is the ISO 355 series (medium wide section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 33215 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 33215 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 33215 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "33215", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "33215" ], "locale_variants": {} }, { "sku": "33216", "brand": "SKF", "manufacturer_designation": "SKF 33216", "series": "33200-series", "type": "tapered_roller", "d_mm": 80, "D_mm": 140, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 308, "static_load_kN": 375, "fatigue_load_limit_kN": 41.5, "max_rpm": 4500, "reference_speed_rpm": 3400, "limiting_speed_rpm": 4500, "weight_g": 2900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "SKF 33216 belongs to the SKF single-row tapered roller range — the 80 mm bore entry in the 33200 series, dimensioned 140 mm OD and 46 mm wide to the ISO 355 boundary plan.On the SKF nameplate, 33216 follows the ISO 355 convention: 3 for the tapered-roller type, 32 for the medium wide section, final digits 16 for the 80 mm bore. In SKF suffix language a bare 33216 is the standard execution; B marks a larger contact angle and Q or J2 mark clearance/cage variants, all quoted separately. With C 308 kN and C0 375 kN, the 33216 pair-sizing check is dominated by the axial share: keep the equivalent load P below the rating at the required L10, remembering one bearing alone cannot cover reversing thrust at 4,500 r/min. A single 33216 locates the shaft in one axial direction only; mount it against a second bearing in O (back-to-back) or X (face-to-face) arrangement, and set the running clearance by the mounting procedure — not by feel.", "applications": [ "crane sheave and hoist gearboxes", "paper-machine and printing rolls", "construction machinery drives", "marine deck machinery shafts" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "false brinelling on idle paired sets exposed to machine vibration", "roller large-end smearing against the cone rib after EP lubricant film failure", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "fretting corrosion on a loose rotating shaft seat" ], "pitfalls": [ "Mount the 80 mm bore 33216 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 332 series at 80 mm bore (140×46 mm) is the wide medium-section choice — more capacity than 30216 in the same OD class but a wider footprint; re-check housing width and pair setting before substituting.", "The tapered contact angle creates an induced axial load under pure radial force; include it in the 33216 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.", "O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 33216 mounting error.", "Catalogue reference speed and limiting speed are different limits: the 3,400 r/min reference is a thermal criterion under load, while the 4,500 r/min limiting value is the mechanical ceiling — observe both.", "The 308/375 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 33216 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 33216 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 33216?", "a": "The SKF 33216 is a single-row tapered roller bearing with 80 mm bore, 140 mm outer diameter and 46 mm width (3.15 × 5.512 × 1.811 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 308 kN, C0 375 kN, fatigue load limit Pu 41.5 kN, reference speed 3,400 r/min, limiting speed 4,500 r/min, mass about 2900 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 33216 bore code work?", "a": "The last two digits of 33216 are bore code 16, so 16 × 5 = 80 mm bore. The 140 mm OD and 46 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 33216 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 32 is the ISO 355 series (medium wide section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 33216 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 33216 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 33216 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "33216", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "33216" ], "locale_variants": {} }, { "sku": "33217", "brand": "SKF", "manufacturer_designation": "SKF 33217", "series": "33200-series", "type": "tapered_roller", "d_mm": 85, "D_mm": 150, "B_mm": 49, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 353, "static_load_kN": 430, "fatigue_load_limit_kN": 48, "max_rpm": 4300, "reference_speed_rpm": 3200, "limiting_speed_rpm": 4300, "weight_g": 3550, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "For a 85 mm shaft carrying combined load, SKF lists 33217 under catalogue execution SKF 33217: one open single-row tapered roller bearing in the medium wide section of the 33200 family.The code breaks down as type prefix 3 (tapered roller), series 32 (the medium wide section), and bore code 17 = 85 mm; dimensions 85×150×49 mm therefore match the ISO 355 envelope. In SKF suffix language a bare 33217 is the standard execution; B marks a larger contact angle and Q or J2 mark clearance/cage variants, all quoted separately. The 48 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.22 C0/C balance shows this execution is tuned to thrust-heavy combined loads rather than pure radial running. Note the minimum-axial-load requirement: at light radial load and high speed the rollers of 33217 must still be held into the rib contact, which is another reason the catalogue recommends paired mounting with controlled setting.", "applications": [ "construction machinery drives", "marine deck machinery shafts", "heavy industrial gearboxes and speed reducers", "large process pump and compressor shafts" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "axial overload spalling at the roller-rib contact beyond the single-row thrust rating", "preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "brinelling from pressing the cone or cup home through the rollers" ], "pitfalls": [ "Mount the 85 mm bore 33217 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 332 series at 85 mm bore (150×49 mm) is the wide medium-section choice — more capacity than 30217 in the same OD class but a wider footprint; re-check housing width and pair setting before substituting.", "Setting is a design value, not an assembly feel: excessive preload in the 33217 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.", "The tapered contact angle creates an induced axial load under pure radial force; include it in the 33217 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.", "The 33217 shares its ISO 355 envelope with other tapered bearings of the same code but is not a drop-in replacement for a ball bearing: it cannot run effectively under pure radial load without a minimum axial load, and a deep-groove bearing cannot replace its combined-load duty.", "The 353/430 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 33217 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 33217 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 33217?", "a": "The SKF 33217 is a single-row tapered roller bearing with 85 mm bore, 150 mm outer diameter and 49 mm width (3.346 × 5.906 × 1.929 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 353 kN, C0 430 kN, fatigue load limit Pu 48 kN, reference speed 3,200 r/min, limiting speed 4,300 r/min, mass about 3550 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 33217 bore code work?", "a": "The last two digits of 33217 are bore code 17, so 17 × 5 = 85 mm bore. The 150 mm OD and 49 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 33217 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 32 is the ISO 355 series (medium wide section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 33217 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 33217 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 33217 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "33217", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "33217" ], "locale_variants": {} }, { "sku": "33218", "brand": "SKF", "manufacturer_designation": "SKF 33218", "series": "33200-series", "type": "tapered_roller", "d_mm": 90, "D_mm": 160, "B_mm": 55, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 415, "static_load_kN": 520, "fatigue_load_limit_kN": 57, "max_rpm": 4000, "reference_speed_rpm": 3000, "limiting_speed_rpm": 4000, "weight_g": 4600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "SKF 33218 (SKF 33218) is the medium wide section tapered roller choice for a 90 mm shaft — one row of tapered rollers on an asymmetric raceway inside the 160×55 mm ISO 355 envelope.Reading the designation: the leading 3 marks a single-row tapered roller bearing, the 32 is the ISO 355 diameter/width series (medium wide section), and the last two digits encode the 90 mm bore; the 160 mm OD and 55 mm width follow the ISO 355 general plan. In SKF suffix language a bare 33218 is the standard execution; B marks a larger contact angle and Q or J2 mark clearance/cage variants, all quoted separately. Selection arithmetic: the C0/C ratio is about 1.25 (static 520 kN against dynamic 415 kN), typical of a tapered roller sized for axial capacity, and the 57 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Specify pairs rather than single units wherever thrust reverses: the tapered contact of 33218 generates an induced axial load under radial force, and an unpaired bearing on a reversing shaft will run slack and fret its seat.", "applications": [ "heavy industrial gearboxes and speed reducers", "large process pump and compressor shafts", "rolling-mill auxiliary drives", "crane sheave and hoist gearboxes" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "uneven load sharing in a pair when spacer faces are not parallel to the bore", "thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting", "pressed-steel cage wear or fracture after prolonged running above the limiting speed", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount the 90 mm bore 33218 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 332 series at 90 mm bore (160×55 mm) is the wide medium-section choice — more capacity than 30218 in the same OD class but a wider footprint; re-check housing width and pair setting before substituting.", "A single 33218 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use an O or X matched pair for bidirectional location.", "Setting is a design value, not an assembly feel: excessive preload in the 33218 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.", "Never press both rings through the wrong element during fitting: force for an interference shaft seat goes through the cone only, or brinell marks on the 160 mm cup race release as noise within the first running hours.", "The 415/520 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 33218 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 33218 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 33218?", "a": "The SKF 33218 is a single-row tapered roller bearing with 90 mm bore, 160 mm outer diameter and 55 mm width (3.543 × 6.299 × 2.165 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 415 kN, C0 520 kN, fatigue load limit Pu 57 kN, reference speed 3,000 r/min, limiting speed 4,000 r/min, mass about 4600 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 33218 bore code work?", "a": "The last two digits of 33218 are bore code 18, so 18 × 5 = 90 mm bore. The 160 mm OD and 55 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 33218 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 32 is the ISO 355 series (medium wide section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 33218 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 33218 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 33218 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "33218", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "33218" ], "locale_variants": {} }, { "sku": "33219", "brand": "SKF", "manufacturer_designation": "SKF 33219", "series": "33200-series", "type": "tapered_roller", "d_mm": 95, "D_mm": 170, "B_mm": 58, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 460, "static_load_kN": 560, "fatigue_load_limit_kN": 62, "max_rpm": 3800, "reference_speed_rpm": 2800, "limiting_speed_rpm": 3800, "weight_g": 5450, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "Ordering number SKF 33219 in SKF catalogue PUB BU/P1 17000 denotes a single-row tapered roller bearing for a 95 mm shaft, medium wide section, with an open pressed-steel-cage execution and one-direction axial capacity.Digit by digit, 33219 reads as bearing type 3 (single-row tapered roller), medium wide section series 32, and bore reference 19 resolving to 95 mm; 170 mm OD and 58 mm width are the matching ISO 355 boundary values. In SKF suffix language a bare 33219 is the standard execution; B marks a larger contact angle and Q or J2 mark clearance/cage variants, all quoted separately. The 37.5 mm radial section height ((170−95)/2) and 5450 g catalogue mass frame a 95 mm bore bearing rated at 460 kN C — roughly 4.84 kN of dynamic capacity per millimetre of bore before application factors. Because the contact line is tapered, one 33219 reacts thrust in a single direction; bidirectional shafts need an O or X pair, and a rotating cone on a 95 mm shaft typically takes a k5 seat with an H7 housing bore.", "applications": [ "rolling-mill auxiliary drives", "crane sheave and hoist gearboxes", "paper-machine and printing rolls", "construction machinery drives" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "roller large-end smearing against the cone rib after EP lubricant film failure", "false brinelling on idle paired sets exposed to machine vibration", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "grease degradation after long shelf storage without rotation or re-greasing" ], "pitfalls": [ "Mount the 95 mm bore 33219 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 332 series at 95 mm bore (170×58 mm) is the wide medium-section choice — more capacity than 30219 in the same OD class but a wider footprint; re-check housing width and pair setting before substituting.", "At the 460 kN rating of 33219, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 3,800 r/min speed end and heavier preload only where moment stiffness dominates.", "A single 33219 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use an O or X matched pair for bidirectional location.", "The pressed-steel cage is rated for standard industrial service; sustained running above the limiting speed or with degraded lubricant wears the cage pockets — inspect the cage at every relubrication interval.", "The 460/560 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 33219 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 33219 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 33219?", "a": "The SKF 33219 is a single-row tapered roller bearing with 95 mm bore, 170 mm outer diameter and 58 mm width (3.74 × 6.693 × 2.283 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 460 kN, C0 560 kN, fatigue load limit Pu 62 kN, reference speed 2,800 r/min, limiting speed 3,800 r/min, mass about 5450 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 33219 bore code work?", "a": "The last two digits of 33219 are bore code 19, so 19 × 5 = 95 mm bore. The 170 mm OD and 58 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 33219 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 32 is the ISO 355 series (medium wide section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 33219 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 33219 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 33219 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "33219", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "33219" ], "locale_variants": {} }, { "sku": "33220", "brand": "SKF", "manufacturer_designation": "SKF 33220", "series": "33200-series", "type": "tapered_roller", "d_mm": 100, "D_mm": 180, "B_mm": 63, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 532, "static_load_kN": 655, "fatigue_load_limit_kN": 71, "max_rpm": 3600, "reference_speed_rpm": 2600, "limiting_speed_rpm": 3600, "weight_g": 6750, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 355", "naming_rule_text": "33220 is a single-row tapered roller bearing in the ISO 33200 dimension series: a separable cone-and-cup design for combined radial and one-direction axial load, listed by SKF in SKF catalogue PUB BU/P1 17000.The code breaks down as type prefix 3 (tapered roller), series 32 (the medium wide section), and bore code 20 = 100 mm; dimensions 100×180×63 mm therefore match the ISO 355 envelope. In SKF suffix language a bare 33220 is the standard execution; B marks a larger contact angle and Q or J2 mark clearance/cage variants, all quoted separately. At 2,600 r/min reference speed the 40.0 mm-section 33220 is governed thermally by preload and lubricant flow; grease or oil selection should be made against that value, with 3,600 r/min as the mechanical ceiling. A single 33220 locates the shaft in one axial direction only; mount it against a second bearing in O (back-to-back) or X (face-to-face) arrangement, and set the running clearance by the mounting procedure — not by feel.", "applications": [ "marine deck machinery shafts", "heavy industrial gearboxes and speed reducers", "large process pump and compressor shafts", "rolling-mill auxiliary drives" ], "failure_modes": [ "cup or cone misalignment when the separable rings are not seated square during mounting", "loose cup rotation in the housing when the specified press fit is not achieved", "axial overload spalling at the roller-rib contact beyond the single-row thrust rating", "preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways", "cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity", "brinelling from pressing the cone or cup home through the rollers" ], "pitfalls": [ "Mount the 100 mm bore 33220 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.", "The 332 series at 100 mm bore (180×63 mm) is the wide medium-section choice — more capacity than 30220 in the same OD class but a wider footprint; re-check housing width and pair setting before substituting.", "At the 532 kN rating of 33220, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 3,600 r/min speed end and heavier preload only where moment stiffness dominates.", "Setting is a design value, not an assembly feel: excessive preload in the 33220 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.", "Shaft and housing fillets must clear the bearing chamfer so the 63 mm-wide cup seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 532/655 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.", "SKF lists several executions of 33220 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 33220 designation when purchasing and match the execution to the mounting arrangement." ], "faq": [ { "q": "What are the dimensions and catalogue data of 33220?", "a": "The SKF 33220 is a single-row tapered roller bearing with 100 mm bore, 180 mm outer diameter and 63 mm width (3.937 × 7.087 × 2.48 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 532 kN, C0 655 kN, fatigue load limit Pu 71 kN, reference speed 2,600 r/min, limiting speed 3,600 r/min, mass about 6750 g. It is an open, separable bearing with a pressed-steel cage." }, { "q": "How does the 33220 bore code work?", "a": "The last two digits of 33220 are bore code 20, so 20 × 5 = 100 mm bore. The 180 mm OD and 63 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code." }, { "q": "What do the 33220 series and basic execution designations mean?", "a": "The leading 3 marks a single-row tapered roller bearing; the second digit 32 is the ISO 355 series (medium wide section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution." }, { "q": "Can a single 33220 take axial load in both directions?", "a": "No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared." }, { "q": "How does 33220 compare with a ball bearing of the same bore?", "a": "A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 33220 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting." } ], "cross_ref": [ { "equiv_sku": "33220", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 355 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://cdn.skfmediahub.skf.com/api/public/0901d196802809de/pdf_preview_medium/0901d196802809de_pdf_preview_medium.pdf", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "33220" ], "locale_variants": {} }, { "sku": "23120", "brand": "SKF", "manufacturer_designation": "SKF 23120 CC/W33", "series": "23100-series", "type": "spherical_roller", "d_mm": 100, "D_mm": 165, "B_mm": 52, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 385, "static_load_kN": 490, "fatigue_load_limit_kN": 53, "max_rpm": 4000, "reference_speed_rpm": 3000, "limiting_speed_rpm": 4000, "weight_g": 4550, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 100 mm shaft carrying heavy radial load with misalignment or deflection, SKF lists 23120 under catalogue execution 23120 CC/W33: two barrel-roller rows on a sphered outer raceway. On the SKF nameplate, 23120 follows the ISO 15 convention: 2 for the spherical roller type, 31 for the dimension series 31 (medium OD, wide), final digits 20 for the 100 mm bore. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. The 53 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.27 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. Mount with the spherical bearing's self-alignment in mind: it compensates ≈ 0.5–2.5° of misalignment depending on series, but the shaft and housing seats still set the datum — a rotating inner ring on a 100 mm shaft typically takes a k5 seat with an H7 housing bore.", "applications": [ "cement-mill trunnion and drive shafts", "heavy conveyor head shafts in mining", "jaw and cone crusher main shafts", "paper-machine press and dryer rolls" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Mount the 100 mm bore 23120 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 23100-series series at 100 mm bore (165×52 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.", "The 4550 g mass and 52 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23120.", "The 4550 g mass and 52 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23120.", "The 385/490 kN ratings are SKF catalogue values for this exact execution (23120 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23120 (cylindrical bore as listed, tapered-bore 23120 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23120 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23120?", "a": "The 23120 CC/W33 is a double-row spherical roller bearing with 100 mm bore, 165 mm outer diameter and 52 mm width (3.937 × 6.496 × 2.047 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 385 kN, C0 490 kN, fatigue load limit Pu 53 kN, reference speed 3,000 r/min, limiting speed 4,000 r/min, mass about 4550 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23120 bore code work?", "a": "The last two digits of 23120 are bore code 20, so 20 × 5 = 100 mm bore. The 165 mm OD and 52 mm width come from the ISO 15 dimension-series plan (dimension series 31 (medium OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23120?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23120 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23120K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23120 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23120", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23120-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H3120 adapter sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C3120-V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 3120 V shares the 100×165×52 mm envelope but catalogue C/C0 differ (475/655 kN vs 385/490 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23120", "23120 CC/W33" ], "locale_variants": {} }, { "sku": "23122", "brand": "SKF", "manufacturer_designation": "SKF 23122 CC/W33", "series": "23100-series", "type": "spherical_roller", "d_mm": 110, "D_mm": 180, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 450, "static_load_kN": 585, "fatigue_load_limit_kN": 61, "max_rpm": 3600, "reference_speed_rpm": 2800, "limiting_speed_rpm": 3600, "weight_g": 5750, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number 23122 CC/W33 in SKF catalogue PUB BU/P1 17000 denotes a double-row spherical roller bearing for a 110 mm shaft, dimension series 31 (medium OD, wide), with open execution and two pressed-steel cages with a floating guide ring. Reading the designation: the leading 2 marks a spherical roller bearing, the 31 is the ISO 15 dimension series (dimension series 31 (medium OD, wide)), and the last two digits encode the 110 mm bore; the 180 mm OD and 56 mm width follow the ISO 15 general plan. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. The 35.0 mm radial section height ((180−110)/2) and 5750 g catalogue mass frame a 110 mm bore bearing rated at 450 kN C — roughly 4.09 kN of dynamic capacity per millimetre of bore before application factors. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.", "applications": [ "rolling-mill pinion and back-up shafts", "large vibrating screens and feeders", "marine propulsion and thruster shafts", "cement-mill trunnion and drive shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals" ], "pitfalls": [ "Mount the 110 mm bore 23122 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 23100-series series at 110 mm bore (180×56 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 450/585 kN ratings are SKF catalogue values for this exact execution (23122 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23122 (cylindrical bore as listed, tapered-bore 23122 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23122 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23122?", "a": "The 23122 CC/W33 is a double-row spherical roller bearing with 110 mm bore, 180 mm outer diameter and 56 mm width (4.331 × 7.087 × 2.205 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 450 kN, C0 585 kN, fatigue load limit Pu 61 kN, reference speed 2,800 r/min, limiting speed 3,600 r/min, mass about 5750 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23122 bore code work?", "a": "The last two digits of 23122 are bore code 22, so 22 × 5 = 110 mm bore. The 180 mm OD and 56 mm width come from the ISO 15 dimension-series plan (dimension series 31 (medium OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23122?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23122 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23122K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23122 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23122", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23122-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H3122 adapter sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23122", "23122 CC/W33" ], "locale_variants": {} }, { "sku": "23124", "brand": "SKF", "manufacturer_designation": "SKF 23124 CC/W33", "series": "23100-series", "type": "spherical_roller", "d_mm": 120, "D_mm": 200, "B_mm": 62, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 534, "static_load_kN": 695, "fatigue_load_limit_kN": 71, "max_rpm": 3400, "reference_speed_rpm": 2600, "limiting_speed_rpm": 3400, "weight_g": 8000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 23124 CC/W33 is a 120×200×62 mm spherical roller bearing — the dimension series 31 (medium OD, wide) entry for a 120 mm shaft, with two rows of symmetrical barrel rollers for combined radial and axial load. Numbering ties the bearing to its envelope: 23124 means spherical-roller type, dimension series 31, 120 mm bore — which is why the 200×62 mm outline swaps dimensionally with other ISO 15 bearings of the same code. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. At 2,600 r/min reference speed the 40.0 mm-section 23124 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 3,400 r/min as the mechanical ceiling. A 120 mm rotating inner ring usually runs m6 on the shaft with H7 in the housing; for vibrating-screen duty the outer ring is instead held tight and the shaft seat loosened — follow the screen builder's fit schedule.", "applications": [ "large induced-draft fan rotors", "SAG and ball-mill drive shafts", "large mining crusher main shafts", "wind-turbine main shaft support" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "At 120 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23100-series series at 120 mm bore (200×62 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23124 pits long before its L10 life.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23124 pits long before its L10 life.", "The 534/695 kN ratings are SKF catalogue values for this exact execution (23124 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23124 (cylindrical bore as listed, tapered-bore 23124 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23124 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23124?", "a": "The 23124 CC/W33 is a double-row spherical roller bearing with 120 mm bore, 200 mm outer diameter and 62 mm width (4.724 × 7.874 × 2.441 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 534 kN, C0 695 kN, fatigue load limit Pu 71 kN, reference speed 2,600 r/min, limiting speed 3,400 r/min, mass about 8000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23124 bore code work?", "a": "The last two digits of 23124 are bore code 24, so 24 × 5 = 120 mm bore. The 200 mm OD and 62 mm width come from the ISO 15 dimension-series plan (dimension series 31 (medium OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23124?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23124 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23124K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23124 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23124", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23124-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on AHX3124 withdrawal sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23124", "23124 CC/W33" ], "locale_variants": {} }, { "sku": "23126", "brand": "SKF", "manufacturer_designation": "SKF 23126 CC/W33", "series": "23100-series", "type": "spherical_roller", "d_mm": 130, "D_mm": 210, "B_mm": 64, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 586, "static_load_kN": 780, "fatigue_load_limit_kN": 78, "max_rpm": 3200, "reference_speed_rpm": 2400, "limiting_speed_rpm": 3200, "weight_g": 8800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "23126 CC/W33 belongs to the SKF spherical roller range — the 130 mm bore entry in the 23100-series series (dimension series 31 (medium OD, wide)), dimensioned 210 mm OD and 64 mm wide. The code breaks down as type digit 2 (double-row spherical roller), dimension series 31 (dimension series 31 (medium OD, wide)), and bore code 26 = 130 mm; dimensions 130×210×64 mm therefore match the ISO 15 envelope. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. With C 586 kN and C0 780 kN, the 23126 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 23126 CCK/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.", "applications": [ "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "steel-plant continuous-caster segments", "large induced-draft fan rotors" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals" ], "pitfalls": [ "At 130 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23100-series series at 130 mm bore (210×64 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.", "Shaft and housing fillets must clear the bearing chamfer so the 64 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "Shaft and housing fillets must clear the bearing chamfer so the 64 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 586/780 kN ratings are SKF catalogue values for this exact execution (23126 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23126 (cylindrical bore as listed, tapered-bore 23126 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23126 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23126?", "a": "The 23126 CC/W33 is a double-row spherical roller bearing with 130 mm bore, 210 mm outer diameter and 64 mm width (5.118 × 8.268 × 2.52 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 586 kN, C0 780 kN, fatigue load limit Pu 78 kN, reference speed 2,400 r/min, limiting speed 3,200 r/min, mass about 8800 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23126 bore code work?", "a": "The last two digits of 23126 are bore code 26, so 26 × 5 = 130 mm bore. The 210 mm OD and 64 mm width come from the ISO 15 dimension-series plan (dimension series 31 (medium OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23126?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23126 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23126K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23126 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23126", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23126-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on AHX3126 withdrawal sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23126", "23126 CC/W33" ], "locale_variants": {} }, { "sku": "23128", "brand": "SKF", "manufacturer_designation": "SKF 23128 CC/W33", "series": "23100-series", "type": "spherical_roller", "d_mm": 140, "D_mm": 225, "B_mm": 68, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 659, "static_load_kN": 900, "fatigue_load_limit_kN": 88, "max_rpm": 2800, "reference_speed_rpm": 2200, "limiting_speed_rpm": 2800, "weight_g": 10500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF 23128 (23128 CC/W33) is the spherical-roller choice for a 140 mm shaft — barrel rollers between an inner ring with two raceways and a common sphered outer raceway inside the 225×68 mm ISO 15 envelope. Digit by digit, 23128 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 31, and bore reference 28 resolving to 140 mm; 225 mm OD and 68 mm width are the matching ISO 15 boundary values. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. Selection arithmetic: the C0/C ratio is about 1.37 (static 900 kN against dynamic 659 kN), typical of a spherical roller sized for heavy combined loads, and the 88 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. For relubrication, route the grease duct to the outer-ring W33 groove position where fitted, and purge until fresh grease appears at the seal — the 68 mm width across two roller rows needs the full charge.", "applications": [ "SAG and ball-mill drive shafts", "large mining crusher main shafts", "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "At 140 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23100-series series at 140 mm bore (225×68 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.", "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23128; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23128; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 659/900 kN ratings are SKF catalogue values for this exact execution (23128 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23128 (cylindrical bore as listed, tapered-bore 23128 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23128 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23128?", "a": "The 23128 CC/W33 is a double-row spherical roller bearing with 140 mm bore, 225 mm outer diameter and 68 mm width (5.512 × 8.858 × 2.677 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 659 kN, C0 900 kN, fatigue load limit Pu 88 kN, reference speed 2,200 r/min, limiting speed 2,800 r/min, mass about 10500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23128 bore code work?", "a": "The last two digits of 23128 are bore code 28, so 28 × 5 = 140 mm bore. The 225 mm OD and 68 mm width come from the ISO 15 dimension-series plan (dimension series 31 (medium OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23128?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23128 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23128K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23128 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23128", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23128-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on AHX3128 withdrawal sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23128", "23128 CC/W33" ], "locale_variants": {} }, { "sku": "23130", "brand": "SKF", "manufacturer_designation": "SKF 23130 CC/W33", "series": "23100-series", "type": "spherical_roller", "d_mm": 150, "D_mm": 250, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 883, "static_load_kN": 1200, "fatigue_load_limit_kN": 114, "max_rpm": 2600, "reference_speed_rpm": 2000, "limiting_speed_rpm": 2600, "weight_g": 16000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "23130 is a double-row spherical roller bearing in the 23100-series family: two rows of barrel rollers on a common sphered outer raceway, self-aligning under shaft deflection, listed by SKF in SKF catalogue PUB BU/P1 17000. Reading the designation: the leading 2 marks a spherical roller bearing, the 31 is the ISO 15 dimension series (dimension series 31 (medium OD, wide)), and the last two digits encode the 150 mm bore; the 250 mm OD and 80 mm width follow the ISO 15 general plan. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. At 2,000 r/min reference speed the 50.0 mm-section 23130 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 2,600 r/min as the mechanical ceiling. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 23130 CCK/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.", "applications": [ "large induced-draft fan rotors", "SAG and ball-mill drive shafts", "large mining crusher main shafts", "wind-turbine main shaft support" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "smearing on the roller-raceway contact during skid starts below the minimum load" ], "pitfalls": [ "At 150 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23100-series series at 150 mm bore (250×80 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23130; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 883/1200 kN ratings are SKF catalogue values for this exact execution (23130 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23130 (cylindrical bore as listed, tapered-bore 23130 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23130 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23130?", "a": "The 23130 CC/W33 is a double-row spherical roller bearing with 150 mm bore, 250 mm outer diameter and 80 mm width (5.906 × 9.843 × 3.15 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 883 kN, C0 1200 kN, fatigue load limit Pu 114 kN, reference speed 2,000 r/min, limiting speed 2,600 r/min, mass about 16000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23130 bore code work?", "a": "The last two digits of 23130 are bore code 30, so 30 × 5 = 150 mm bore. The 250 mm OD and 80 mm width come from the ISO 15 dimension-series plan (dimension series 31 (medium OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23130?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23130 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23130K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23130 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23130", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23130-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H3130 adapter sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C3130", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3130 shares the 150×250×80 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C3130-K", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3130 K shares the 150×250×80 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23130", "23130 CC/W33" ], "locale_variants": {} }, { "sku": "23132", "brand": "SKF", "manufacturer_designation": "SKF 23132 CC/W33", "series": "23100-series", "type": "spherical_roller", "d_mm": 160, "D_mm": 270, "B_mm": 86, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1029, "static_load_kN": 1370, "fatigue_load_limit_kN": 129, "max_rpm": 2400, "reference_speed_rpm": 1900, "limiting_speed_rpm": 2400, "weight_g": 20500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 23132 appears as 23132 CC/W33: an open, double-row spherical roller bearing, self-aligning by virtue of the sphered outer raceway, sized 160×270×86 mm to the ISO 15 boundary plan. Numbering ties the bearing to its envelope: 23132 means spherical-roller type, dimension series 31, 160 mm bore — which is why the 270×86 mm outline swaps dimensionally with other ISO 15 bearings of the same code. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. With C 1029 kN and C0 1370 kN, the 23132 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. For relubrication, route the grease duct to the outer-ring W33 groove position where fitted, and purge until fresh grease appears at the seal — the 86 mm width across two roller rows needs the full charge.", "applications": [ "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "steel-plant continuous-caster segments", "large induced-draft fan rotors" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "At 160 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23100-series series at 160 mm bore (270×86 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23132 pits long before its L10 life.", "Catalogue reference speed and limiting speed are different limits: the 1,900 r/min reference is a thermal criterion under load, while the 2,400 r/min limiting value is the mechanical ceiling — observe both.", "The 1029/1370 kN ratings are SKF catalogue values for this exact execution (23132 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23132 (cylindrical bore as listed, tapered-bore 23132 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23132 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23132?", "a": "The 23132 CC/W33 is a double-row spherical roller bearing with 160 mm bore, 270 mm outer diameter and 86 mm width (6.299 × 10.63 × 3.386 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1029 kN, C0 1370 kN, fatigue load limit Pu 129 kN, reference speed 1,900 r/min, limiting speed 2,400 r/min, mass about 20500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23132 bore code work?", "a": "The last two digits of 23132 are bore code 32, so 32 × 5 = 160 mm bore. The 270 mm OD and 86 mm width come from the ISO 15 dimension-series plan (dimension series 31 (medium OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23132?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23132 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23132K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23132 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23132", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23132-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H3132 adapter sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C3132", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3132 shares the 160×270×86 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C3132-K", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3132 K shares the 160×270×86 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23132", "23132 CC/W33" ], "locale_variants": {} }, { "sku": "23134", "brand": "SKF", "manufacturer_designation": "SKF 23134 CC/W33", "series": "23100-series", "type": "spherical_roller", "d_mm": 170, "D_mm": 280, "B_mm": 88, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1086, "static_load_kN": 1500, "fatigue_load_limit_kN": 137, "max_rpm": 2400, "reference_speed_rpm": 1800, "limiting_speed_rpm": 2400, "weight_g": 22000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 170 mm shaft carrying heavy radial load with misalignment or deflection, SKF lists 23134 under catalogue execution 23134 CC/W33: two barrel-roller rows on a sphered outer raceway. The code breaks down as type digit 2 (double-row spherical roller), dimension series 31 (dimension series 31 (medium OD, wide)), and bore code 34 = 170 mm; dimensions 170×280×88 mm therefore match the ISO 15 envelope. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. Selection arithmetic: the C0/C ratio is about 1.38 (static 1500 kN against dynamic 1086 kN), typical of a spherical roller sized for heavy combined loads, and the 137 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Drive-on force must go through the ring being fitted: press or induction-heat the inner ring onto the 170 mm shaft (max 120 °C) and never transmit mounting force through the roller complement, or the raceways brinell.", "applications": [ "SAG and ball-mill drive shafts", "large mining crusher main shafts", "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "smearing on the roller-raceway contact during skid starts below the minimum load" ], "pitfalls": [ "At 170 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23100-series series at 170 mm bore (280×88 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.", "Shaft and housing fillets must clear the bearing chamfer so the 88 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 23134 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 1086/1500 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The 1086/1500 kN ratings are SKF catalogue values for this exact execution (23134 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23134 (cylindrical bore as listed, tapered-bore 23134 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23134 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23134?", "a": "The 23134 CC/W33 is a double-row spherical roller bearing with 170 mm bore, 280 mm outer diameter and 88 mm width (6.693 × 11.024 × 3.465 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1086 kN, C0 1500 kN, fatigue load limit Pu 137 kN, reference speed 1,800 r/min, limiting speed 2,400 r/min, mass about 22000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23134 bore code work?", "a": "The last two digits of 23134 are bore code 34, so 34 × 5 = 170 mm bore. The 280 mm OD and 88 mm width come from the ISO 15 dimension-series plan (dimension series 31 (medium OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23134?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23134 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23134K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23134 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23134", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23134-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H3134 adapter sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23134", "23134 CC/W33" ], "locale_variants": {} }, { "sku": "23136", "brand": "SKF", "manufacturer_designation": "SKF 23136 CC/W33", "series": "23100-series", "type": "spherical_roller", "d_mm": 180, "D_mm": 300, "B_mm": 96, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1263, "static_load_kN": 1760, "fatigue_load_limit_kN": 160, "max_rpm": 2200, "reference_speed_rpm": 1700, "limiting_speed_rpm": 2200, "weight_g": 28000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number 23136 CC/W33 in SKF catalogue PUB BU/P1 17000 denotes a double-row spherical roller bearing for a 180 mm shaft, dimension series 31 (medium OD, wide), with open execution and two pressed-steel cages with a floating guide ring. Digit by digit, 23136 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 31, and bore reference 36 resolving to 180 mm; 300 mm OD and 96 mm width are the matching ISO 15 boundary values. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. Catalogue mass 28000 g for the 180×300×96 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. After mounting, swing the outer ring to confirm free self-alignment: the 23136 should tilt through its full catalogue misalignment range without binding; a stiff joint signals a cocked seat or shoulder interference.", "applications": [ "large dredger and marine winch drums", "steel-plant continuous-caster segments", "large induced-draft fan rotors", "SAG and ball-mill drive shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "At 180 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23100-series series at 180 mm bore (300×96 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.", "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23136; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 28000 g mass and 96 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23136.", "The 1263/1760 kN ratings are SKF catalogue values for this exact execution (23136 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23136 (cylindrical bore as listed, tapered-bore 23136 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23136 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23136?", "a": "The 23136 CC/W33 is a double-row spherical roller bearing with 180 mm bore, 300 mm outer diameter and 96 mm width (7.087 × 11.811 × 3.78 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1263 kN, C0 1760 kN, fatigue load limit Pu 160 kN, reference speed 1,700 r/min, limiting speed 2,200 r/min, mass about 28000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23136 bore code work?", "a": "The last two digits of 23136 are bore code 36, so 36 × 5 = 180 mm bore. The 300 mm OD and 96 mm width come from the ISO 15 dimension-series plan (dimension series 31 (medium OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23136?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23136 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23136K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23136 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23136", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23136-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H3136 adapter sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C3136", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3136 shares the 180×300×96 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C3136-K", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3136 K shares the 180×300×96 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23136", "23136 CC/W33" ], "locale_variants": {} }, { "sku": "23138", "brand": "SKF", "manufacturer_designation": "SKF 23138 CC/W33", "series": "23100-series", "type": "spherical_roller", "d_mm": 190, "D_mm": 320, "B_mm": 104, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1456, "static_load_kN": 2080, "fatigue_load_limit_kN": 183, "max_rpm": 2000, "reference_speed_rpm": 1500, "limiting_speed_rpm": 2000, "weight_g": 35000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 23138 CC/W33 is a 190×320×104 mm spherical roller bearing — the dimension series 31 (medium OD, wide) entry for a 190 mm shaft, with two rows of symmetrical barrel rollers for combined radial and axial load. On the SKF nameplate, 23138 follows the ISO 15 convention: 2 for the spherical roller type, 31 for the dimension series 31 (medium OD, wide), final digits 38 for the 190 mm bore. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. Speed planning uses two different ceilings: 1,500 r/min thermal reference and 2,000 r/min mechanical limiting speed. Mount with the spherical bearing's self-alignment in mind: it compensates ≈ 0.5–2.5° of misalignment depending on series, but the shaft and housing seats still set the datum — a rotating inner ring on a 190 mm shaft typically takes a m6 seat with an H7 housing bore.", "applications": [ "large mining crusher main shafts", "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "smearing on the roller-raceway contact during skid starts below the minimum load" ], "pitfalls": [ "At 190 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23100-series series at 190 mm bore (320×104 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.", "Catalogue reference speed and limiting speed are different limits: the 1,500 r/min reference is a thermal criterion under load, while the 2,000 r/min limiting value is the mechanical ceiling — observe both.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 1456/2080 kN ratings are SKF catalogue values for this exact execution (23138 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23138 (cylindrical bore as listed, tapered-bore 23138 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23138 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23138?", "a": "The 23138 CC/W33 is a double-row spherical roller bearing with 190 mm bore, 320 mm outer diameter and 104 mm width (7.48 × 12.598 × 4.094 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1456 kN, C0 2080 kN, fatigue load limit Pu 183 kN, reference speed 1,500 r/min, limiting speed 2,000 r/min, mass about 35000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23138 bore code work?", "a": "The last two digits of 23138 are bore code 38, so 38 × 5 = 190 mm bore. The 320 mm OD and 104 mm width come from the ISO 15 dimension-series plan (dimension series 31 (medium OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23138?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23138 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23138K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23138 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23138", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23138-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H3138 adapter sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C3138-V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 3138 V shares the 190×320×104 mm envelope but catalogue C/C0 differ (1700/2550 kN vs 1456/2080 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C3138-KV", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 3138 KV shares the 190×320×104 mm envelope but catalogue C/C0 differ (1700/2550 kN vs 1456/2080 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23138", "23138 CC/W33" ], "locale_variants": {} }, { "sku": "23140", "brand": "SKF", "manufacturer_designation": "SKF 23140 CC/W33", "series": "23100-series", "type": "spherical_roller", "d_mm": 200, "D_mm": 340, "B_mm": 112, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1665, "static_load_kN": 2360, "fatigue_load_limit_kN": 204, "max_rpm": 1900, "reference_speed_rpm": 1500, "limiting_speed_rpm": 1900, "weight_g": 43000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "23140 CC/W33 belongs to the SKF spherical roller range — the 200 mm bore entry in the 23100-series series (dimension series 31 (medium OD, wide)), dimensioned 340 mm OD and 112 mm wide. Numbering ties the bearing to its envelope: 23140 means spherical-roller type, dimension series 31, 200 mm bore — which is why the 340×112 mm outline swaps dimensionally with other ISO 15 bearings of the same code. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. Selection arithmetic: the C0/C ratio is about 1.42 (static 2360 kN against dynamic 1665 kN), typical of a spherical roller sized for heavy combined loads, and the 204 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. After mounting, swing the outer ring to confirm free self-alignment: the 23140 should tilt through its full catalogue misalignment range without binding; a stiff joint signals a cocked seat or shoulder interference.", "applications": [ "SAG and ball-mill drive shafts", "large mining crusher main shafts", "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals" ], "pitfalls": [ "At 200 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23100-series series at 200 mm bore (340×112 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23140 pits long before its L10 life.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 1665/2360 kN ratings are SKF catalogue values for this exact execution (23140 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23140 (cylindrical bore as listed, tapered-bore 23140 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23140 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23140?", "a": "The 23140 CC/W33 is a double-row spherical roller bearing with 200 mm bore, 340 mm outer diameter and 112 mm width (7.874 × 13.386 × 4.409 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1665 kN, C0 2360 kN, fatigue load limit Pu 204 kN, reference speed 1,500 r/min, limiting speed 1,900 r/min, mass about 43000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23140 bore code work?", "a": "The last two digits of 23140 are bore code 40, so 40 × 5 = 200 mm bore. The 340 mm OD and 112 mm width come from the ISO 15 dimension-series plan (dimension series 31 (medium OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23140?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23140 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23140K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23140 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23140", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23140-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on AH3140 withdrawal sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C3140", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3140 shares the 200×340×112 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C3140-K", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3140 K shares the 200×340×112 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23140", "23140 CC/W33" ], "locale_variants": {} }, { "sku": "23144", "brand": "SKF", "manufacturer_designation": "SKF 23144 CC/W33", "series": "23100-series", "type": "spherical_roller", "d_mm": 220, "D_mm": 370, "B_mm": 120, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1888, "static_load_kN": 2750, "fatigue_load_limit_kN": 232, "max_rpm": 1700, "reference_speed_rpm": 1300, "limiting_speed_rpm": 1700, "weight_g": 53500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "23144 is a double-row spherical roller bearing in the 23100-series family: two rows of barrel rollers on a common sphered outer raceway, self-aligning under shaft deflection, listed by SKF in SKF catalogue PUB BU/P1 17000. Digit by digit, 23144 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 31, and bore reference 44 resolving to 220 mm; 370 mm OD and 120 mm width are the matching ISO 15 boundary values. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. Speed planning uses two different ceilings: 1,300 r/min thermal reference and 1,700 r/min mechanical limiting speed. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.", "applications": [ "large mining crusher main shafts", "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals" ], "pitfalls": [ "At 220 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23100-series series at 220 mm bore (370×120 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.", "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23144; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "Shaft and housing fillets must clear the bearing chamfer so the 120 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 1888/2750 kN ratings are SKF catalogue values for this exact execution (23144 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23144 (cylindrical bore as listed, tapered-bore 23144 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23144 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23144?", "a": "The 23144 CC/W33 is a double-row spherical roller bearing with 220 mm bore, 370 mm outer diameter and 120 mm width (8.661 × 14.567 × 4.724 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1888 kN, C0 2750 kN, fatigue load limit Pu 232 kN, reference speed 1,300 r/min, limiting speed 1,700 r/min, mass about 53500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23144 bore code work?", "a": "The last two digits of 23144 are bore code 44, so 44 × 5 = 220 mm bore. The 370 mm OD and 120 mm width come from the ISO 15 dimension-series plan (dimension series 31 (medium OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23144?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23144 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23144K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23144 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23144", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23144-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on AOH3144 withdrawal sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C3144", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3144 shares the 220×370×120 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C3144-K", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3144 K shares the 220×370×120 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23144", "23144 CC/W33" ], "locale_variants": {} }, { "sku": "23148", "brand": "SKF", "manufacturer_designation": "SKF 23148 CC/W33", "series": "23100-series", "type": "spherical_roller", "d_mm": 240, "D_mm": 400, "B_mm": 128, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2187, "static_load_kN": 3200, "fatigue_load_limit_kN": 255, "max_rpm": 1600, "reference_speed_rpm": 1200, "limiting_speed_rpm": 1600, "weight_g": 66500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 240 mm shaft carrying heavy radial load with misalignment or deflection, SKF lists 23148 under catalogue execution 23148 CC/W33: two barrel-roller rows on a sphered outer raceway. Reading the designation: the leading 2 marks a spherical roller bearing, the 31 is the ISO 15 dimension series (dimension series 31 (medium OD, wide)), and the last two digits encode the 240 mm bore; the 400 mm OD and 128 mm width follow the ISO 15 general plan. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. The 80.0 mm radial section height ((400−240)/2) and 66500 g catalogue mass frame a 240 mm bore bearing rated at 2187 kN C — roughly 9.11 kN of dynamic capacity per millimetre of bore before application factors. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 23148 CCK/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.", "applications": [ "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "steel-plant continuous-caster segments" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals" ], "pitfalls": [ "At 240 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23100-series series at 240 mm bore (400×128 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.", "The 23148 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 2187/3200 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "Catalogue reference speed and limiting speed are different limits: the 1,200 r/min reference is a thermal criterion under load, while the 1,600 r/min limiting value is the mechanical ceiling — observe both.", "The 2187/3200 kN ratings are SKF catalogue values for this exact execution (23148 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23148 (cylindrical bore as listed, tapered-bore 23148 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23148 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23148?", "a": "The 23148 CC/W33 is a double-row spherical roller bearing with 240 mm bore, 400 mm outer diameter and 128 mm width (9.449 × 15.748 × 5.039 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 2187 kN, C0 3200 kN, fatigue load limit Pu 255 kN, reference speed 1,200 r/min, limiting speed 1,600 r/min, mass about 66500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23148 bore code work?", "a": "The last two digits of 23148 are bore code 48, so 48 × 5 = 240 mm bore. The 400 mm OD and 128 mm width come from the ISO 15 dimension-series plan (dimension series 31 (medium OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23148?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23148 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23148K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23148 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23148", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23148-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on AOH3148 withdrawal sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C3148", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3148 shares the 240×400×128 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C3148-K", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3148 K shares the 240×400×128 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23148", "23148 CC/W33" ], "locale_variants": {} }, { "sku": "23152", "brand": "SKF", "manufacturer_designation": "SKF 23152 CC/W33", "series": "23100-series", "type": "spherical_roller", "d_mm": 260, "D_mm": 440, "B_mm": 144, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2664, "static_load_kN": 3900, "fatigue_load_limit_kN": 290, "max_rpm": 1400, "reference_speed_rpm": 1100, "limiting_speed_rpm": 1400, "weight_g": 90500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 23152 CC/W33 is a 260×440×144 mm spherical roller bearing — the dimension series 31 (medium OD, wide) entry for a 260 mm shaft, with two rows of symmetrical barrel rollers for combined radial and axial load. Digit by digit, 23152 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 31, and bore reference 52 resolving to 260 mm; 440 mm OD and 144 mm width are the matching ISO 15 boundary values. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. The 290 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.46 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 23152 CCK/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.", "applications": [ "steel-plant continuous-caster segments", "large induced-draft fan rotors", "SAG and ball-mill drive shafts", "large mining crusher main shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "smearing on the roller-raceway contact during skid starts below the minimum load" ], "pitfalls": [ "At 260 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23100-series series at 260 mm bore (440×144 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.", "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23152; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 23152 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 2664/3900 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The 2664/3900 kN ratings are SKF catalogue values for this exact execution (23152 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23152 (cylindrical bore as listed, tapered-bore 23152 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23152 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23152?", "a": "The 23152 CC/W33 is a double-row spherical roller bearing with 260 mm bore, 440 mm outer diameter and 144 mm width (10.236 × 17.323 × 5.669 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 2664 kN, C0 3900 kN, fatigue load limit Pu 290 kN, reference speed 1,100 r/min, limiting speed 1,400 r/min, mass about 90500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23152 bore code work?", "a": "The last two digits of 23152 are bore code 52, so 52 × 5 = 260 mm bore. The 440 mm OD and 144 mm width come from the ISO 15 dimension-series plan (dimension series 31 (medium OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23152?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23152 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23152K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23152 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23152", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23152-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on OH3152 adapter sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C3152", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3152 shares the 260×440×144 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C3152-K", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3152 K shares the 260×440×144 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23152", "23152 CC/W33" ], "locale_variants": {} }, { "sku": "23156", "brand": "SKF", "manufacturer_designation": "SKF 23156 CC/W33", "series": "23100-series", "type": "spherical_roller", "d_mm": 280, "D_mm": 460, "B_mm": 146, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2784, "static_load_kN": 4250, "fatigue_load_limit_kN": 335, "max_rpm": 1300, "reference_speed_rpm": 1000, "limiting_speed_rpm": 1300, "weight_g": 97000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF 23156 (23156 CC/W33) is the spherical-roller choice for a 280 mm shaft — barrel rollers between an inner ring with two raceways and a common sphered outer raceway inside the 460×146 mm ISO 15 envelope. Reading the designation: the leading 2 marks a spherical roller bearing, the 31 is the ISO 15 dimension series (dimension series 31 (medium OD, wide)), and the last two digits encode the 280 mm bore; the 460 mm OD and 146 mm width follow the ISO 15 general plan. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. At 1,000 r/min reference speed the 90.0 mm-section 23156 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 1,300 r/min as the mechanical ceiling. Drive-on force must go through the ring being fitted: press or induction-heat the inner ring onto the 280 mm shaft (max 120 °C) and never transmit mounting force through the roller complement, or the raceways brinell.", "applications": [ "large induced-draft fan rotors", "SAG and ball-mill drive shafts", "large mining crusher main shafts", "wind-turbine main shaft support" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "smearing on the roller-raceway contact during skid starts below the minimum load" ], "pitfalls": [ "At 280 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23100-series series at 280 mm bore (460×146 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.", "The 23156 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 2784/4250 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 2784/4250 kN ratings are SKF catalogue values for this exact execution (23156 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23156 (cylindrical bore as listed, tapered-bore 23156 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23156 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23156?", "a": "The 23156 CC/W33 is a double-row spherical roller bearing with 280 mm bore, 460 mm outer diameter and 146 mm width (11.024 × 18.11 × 5.748 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 2784 kN, C0 4250 kN, fatigue load limit Pu 335 kN, reference speed 1,000 r/min, limiting speed 1,300 r/min, mass about 97000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23156 bore code work?", "a": "The last two digits of 23156 are bore code 56, so 56 × 5 = 280 mm bore. The 460 mm OD and 146 mm width come from the ISO 15 dimension-series plan (dimension series 31 (medium OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23156?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23156 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23156K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23156 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23156", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23156-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on OH3156 adapter sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C3156", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3156 shares the 280×460×146 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C3156-K", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3156 K shares the 280×460×146 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23156", "23156 CC/W33" ], "locale_variants": {} }, { "sku": "23160", "brand": "SKF", "manufacturer_designation": "SKF 23160 CC/W33", "series": "23100-series", "type": "spherical_roller", "d_mm": 300, "D_mm": 500, "B_mm": 160, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 3368, "static_load_kN": 5100, "fatigue_load_limit_kN": 380, "max_rpm": 1200, "reference_speed_rpm": 950, "limiting_speed_rpm": 1200, "weight_g": 125000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 23160 appears as 23160 CC/W33: an open, double-row spherical roller bearing, self-aligning by virtue of the sphered outer raceway, sized 300×500×160 mm to the ISO 15 boundary plan. Digit by digit, 23160 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 31, and bore reference 60 resolving to 300 mm; 500 mm OD and 160 mm width are the matching ISO 15 boundary values. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. The 100.0 mm radial section height ((500−300)/2) and 125000 g catalogue mass frame a 300 mm bore bearing rated at 3368 kN C — roughly 11.23 kN of dynamic capacity per millimetre of bore before application factors. Drive-on force must go through the ring being fitted: press or induction-heat the inner ring onto the 300 mm shaft (max 120 °C) and never transmit mounting force through the roller complement, or the raceways brinell.", "applications": [ "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "steel-plant continuous-caster segments" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "At 300 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23100-series series at 300 mm bore (500×160 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.", "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23160; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23160 pits long before its L10 life.", "The 3368/5100 kN ratings are SKF catalogue values for this exact execution (23160 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23160 (cylindrical bore as listed, tapered-bore 23160 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23160 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23160?", "a": "The 23160 CC/W33 is a double-row spherical roller bearing with 300 mm bore, 500 mm outer diameter and 160 mm width (11.811 × 19.685 × 6.299 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 3368 kN, C0 5100 kN, fatigue load limit Pu 380 kN, reference speed 950 r/min, limiting speed 1,200 r/min, mass about 125000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23160 bore code work?", "a": "The last two digits of 23160 are bore code 60, so 60 × 5 = 300 mm bore. The 500 mm OD and 160 mm width come from the ISO 15 dimension-series plan (dimension series 31 (medium OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23160?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23160 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23160K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23160 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23160", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23160-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on OH3160 adapter sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C3160", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3160 shares the 300×500×160 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C3160-K", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3160 K shares the 300×500×160 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23160", "23160 CC/W33" ], "locale_variants": {} }, { "sku": "23164", "brand": "SKF", "manufacturer_designation": "SKF 23164 CC/W33", "series": "23100-series", "type": "spherical_roller", "d_mm": 320, "D_mm": 540, "B_mm": 176, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 3923, "static_load_kN": 6000, "fatigue_load_limit_kN": 440, "max_rpm": 1100, "reference_speed_rpm": 850, "limiting_speed_rpm": 1100, "weight_g": 165000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number 23164 CC/W33 in SKF catalogue PUB BU/P1 17000 denotes a double-row spherical roller bearing for a 320 mm shaft, dimension series 31 (medium OD, wide), with open execution and two pressed-steel cages with a floating guide ring. Reading the designation: the leading 2 marks a spherical roller bearing, the 31 is the ISO 15 dimension series (dimension series 31 (medium OD, wide)), and the last two digits encode the 320 mm bore; the 540 mm OD and 176 mm width follow the ISO 15 general plan. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. With C 3923 kN and C0 6000 kN, the 23164 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. Mount with the spherical bearing's self-alignment in mind: it compensates ≈ 0.5–2.5° of misalignment depending on series, but the shaft and housing seats still set the datum — a rotating inner ring on a 320 mm shaft typically takes a m6 seat with an H7 housing bore.", "applications": [ "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "steel-plant continuous-caster segments", "large induced-draft fan rotors" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "At 320 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23100-series series at 320 mm bore (540×176 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.", "The 23164 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 3923/6000 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23164; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 3923/6000 kN ratings are SKF catalogue values for this exact execution (23164 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23164 (cylindrical bore as listed, tapered-bore 23164 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23164 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23164?", "a": "The 23164 CC/W33 is a double-row spherical roller bearing with 320 mm bore, 540 mm outer diameter and 176 mm width (12.598 × 21.26 × 6.929 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 3923 kN, C0 6000 kN, fatigue load limit Pu 440 kN, reference speed 850 r/min, limiting speed 1,100 r/min, mass about 165000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23164 bore code work?", "a": "The last two digits of 23164 are bore code 64, so 64 × 5 = 320 mm bore. The 540 mm OD and 176 mm width come from the ISO 15 dimension-series plan (dimension series 31 (medium OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23164?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23164 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23164K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23164 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23164", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23164-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on OH3164 adapter sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C3164-M", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3164 M shares the 320×540×176 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C3164-KM", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3164 KM shares the 320×540×176 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23164", "23164 CC/W33" ], "locale_variants": {} }, { "sku": "23168", "brand": "SKF", "manufacturer_designation": "SKF 23168 CC/W33", "series": "23100-series", "type": "spherical_roller", "d_mm": 340, "D_mm": 580, "B_mm": 190, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4445, "static_load_kN": 6800, "fatigue_load_limit_kN": 480, "max_rpm": 1000, "reference_speed_rpm": 800, "limiting_speed_rpm": 1000, "weight_g": 210000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "23168 CC/W33 belongs to the SKF spherical roller range — the 340 mm bore entry in the 23100-series series (dimension series 31 (medium OD, wide)), dimensioned 580 mm OD and 190 mm wide. The code breaks down as type digit 2 (double-row spherical roller), dimension series 31 (dimension series 31 (medium OD, wide)), and bore code 68 = 340 mm; dimensions 340×580×190 mm therefore match the ISO 15 envelope. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. Catalogue mass 210000 g for the 340×580×190 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. A 340 mm rotating inner ring usually runs m6 on the shaft with H7 in the housing; for vibrating-screen duty the outer ring is instead held tight and the shaft seat loosened — follow the screen builder's fit schedule.", "applications": [ "large dredger and marine winch drums", "steel-plant continuous-caster segments", "large induced-draft fan rotors", "SAG and ball-mill drive shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "At 340 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23100-series series at 340 mm bore (580×190 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 23168 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 4445/6800 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The 4445/6800 kN ratings are SKF catalogue values for this exact execution (23168 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23168 (cylindrical bore as listed, tapered-bore 23168 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23168 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23168?", "a": "The 23168 CC/W33 is a double-row spherical roller bearing with 340 mm bore, 580 mm outer diameter and 190 mm width (13.386 × 22.835 × 7.48 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 4445 kN, C0 6800 kN, fatigue load limit Pu 480 kN, reference speed 800 r/min, limiting speed 1,000 r/min, mass about 210000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23168 bore code work?", "a": "The last two digits of 23168 are bore code 68, so 68 × 5 = 340 mm bore. The 580 mm OD and 190 mm width come from the ISO 15 dimension-series plan (dimension series 31 (medium OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23168?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23168 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23168K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23168 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23168", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23168-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on OH3168 adapter sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C3168-M", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 3168 M shares the 340×580×190 mm envelope but catalogue C/C0 differ (4900/7500 kN vs 4445/6800 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C3168-KM", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 3168 KM shares the 340×580×190 mm envelope but catalogue C/C0 differ (4900/7500 kN vs 4445/6800 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23168", "23168 CC/W33" ], "locale_variants": {} }, { "sku": "23172", "brand": "SKF", "manufacturer_designation": "SKF 23172 CC/W33", "series": "23100-series", "type": "spherical_roller", "d_mm": 360, "D_mm": 600, "B_mm": 192, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4515, "static_load_kN": 6950, "fatigue_load_limit_kN": 490, "max_rpm": 1000, "reference_speed_rpm": 750, "limiting_speed_rpm": 1000, "weight_g": 220000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "23172 is a double-row spherical roller bearing in the 23100-series family: two rows of barrel rollers on a common sphered outer raceway, self-aligning under shaft deflection, listed by SKF in SKF catalogue PUB BU/P1 17000. Reading the designation: the leading 2 marks a spherical roller bearing, the 31 is the ISO 15 dimension series (dimension series 31 (medium OD, wide)), and the last two digits encode the 360 mm bore; the 600 mm OD and 192 mm width follow the ISO 15 general plan. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. Selection arithmetic: the C0/C ratio is about 1.54 (static 6950 kN against dynamic 4515 kN), typical of a spherical roller sized for heavy combined loads, and the 490 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. A 360 mm rotating inner ring usually runs m6 on the shaft with H7 in the housing; for vibrating-screen duty the outer ring is instead held tight and the shaft seat loosened — follow the screen builder's fit schedule.", "applications": [ "SAG and ball-mill drive shafts", "large mining crusher main shafts", "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "At 360 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23100-series series at 360 mm bore (600×192 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.", "The 23172 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 4515/6950 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The 220000 g mass and 192 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23172.", "The 4515/6950 kN ratings are SKF catalogue values for this exact execution (23172 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23172 (cylindrical bore as listed, tapered-bore 23172 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23172 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23172?", "a": "The 23172 CC/W33 is a double-row spherical roller bearing with 360 mm bore, 600 mm outer diameter and 192 mm width (14.173 × 23.622 × 7.559 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 4515 kN, C0 6950 kN, fatigue load limit Pu 490 kN, reference speed 750 r/min, limiting speed 1,000 r/min, mass about 220000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23172 bore code work?", "a": "The last two digits of 23172 are bore code 72, so 72 × 5 = 360 mm bore. The 600 mm OD and 192 mm width come from the ISO 15 dimension-series plan (dimension series 31 (medium OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23172?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23172 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23172K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23172 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23172", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23172-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on OH3172 adapter sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C3172-M", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 3172 M shares the 360×600×192 mm envelope but catalogue C/C0 differ (5000/8000 kN vs 4515/6950 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C3172-KM", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 3172 KM shares the 360×600×192 mm envelope but catalogue C/C0 differ (5000/8000 kN vs 4515/6950 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23172", "23172 CC/W33" ], "locale_variants": {} }, { "sku": "23176", "brand": "SKF", "manufacturer_designation": "SKF 23176 CA/W33", "series": "23100-series", "type": "spherical_roller", "d_mm": 380, "D_mm": 620, "B_mm": 194, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass_machined_M1", "dynamic_load_kN": 4561, "static_load_kN": 7100, "fatigue_load_limit_kN": 500, "max_rpm": 1000, "reference_speed_rpm": 560, "limiting_speed_rpm": 1000, "weight_g": 230000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 380 mm shaft carrying heavy radial load with misalignment or deflection, SKF lists 23176 under catalogue execution 23176 CA/W33: two barrel-roller rows on a sphered outer raceway. The code breaks down as type digit 2 (double-row spherical roller), dimension series 31 (dimension series 31 (medium OD, wide)), and bore code 76 = 380 mm; dimensions 380×620×194 mm therefore match the ISO 15 envelope. In SKF suffix language, CA/W33 means the brass-cage CA execution — often preferred for the largest bores and for shock/vibration duty where a rigid machined cage matters; W33 adds the relubrication groove. The sealed 2CS5 and vibrating-screen VA405 are separate executions. Speed planning uses two different ceilings: 560 r/min thermal reference and 1,000 r/min mechanical limiting speed. For relubrication, route the grease duct to the outer-ring W33 groove position where fitted, and purge until fresh grease appears at the seal — the 194 mm width across two roller rows needs the full charge.", "applications": [ "large mining crusher main shafts", "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "At 380 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23100-series series at 380 mm bore (620×194 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23176 pits long before its L10 life.", "The 4561/7100 kN ratings are SKF catalogue values for this exact execution (23176 CA/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23176 (cylindrical bore as listed, tapered-bore 23176 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23176 CA/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23176?", "a": "The 23176 CA/W33 is a double-row spherical roller bearing with 380 mm bore, 620 mm outer diameter and 194 mm width (14.961 × 24.409 × 7.638 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 4561 kN, C0 7100 kN, fatigue load limit Pu 500 kN, reference speed 560 r/min, limiting speed 1,000 r/min, mass about 230000 g. It is an open, self-aligning bearing with a one-piece machined brass cage guided on the inner ring (CA design)." }, { "q": "How does the 23176 bore code work?", "a": "The last two digits of 23176 are bore code 76, so 76 × 5 = 380 mm bore. The 620 mm OD and 194 mm width come from the ISO 15 dimension-series plan (dimension series 31 (medium OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CA/W33 suffix mean on 23176?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23176 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23176K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23176 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23176", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23176-CAK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on OH3176 adapter sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C3176-MB", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3176 MB shares the 380×620×194 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C3176-KMB", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3176 KMB shares the 380×620×194 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23176", "23176 CA/W33" ], "locale_variants": {} }, { "sku": "23180", "brand": "SKF", "manufacturer_designation": "SKF 23180 CA/W33", "series": "23100-series", "type": "spherical_roller", "d_mm": 400, "D_mm": 650, "B_mm": 200, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass_machined_M1", "dynamic_load_kN": 4864, "static_load_kN": 7650, "fatigue_load_limit_kN": 530, "max_rpm": 950, "reference_speed_rpm": 530, "limiting_speed_rpm": 950, "weight_g": 265000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 23180 CA/W33 is a 400×650×200 mm spherical roller bearing — the dimension series 31 (medium OD, wide) entry for a 400 mm shaft, with two rows of symmetrical barrel rollers for combined radial and axial load. Reading the designation: the leading 2 marks a spherical roller bearing, the 31 is the ISO 15 dimension series (dimension series 31 (medium OD, wide)), and the last two digits encode the 400 mm bore; the 650 mm OD and 200 mm width follow the ISO 15 general plan. In SKF suffix language, CA/W33 means the brass-cage CA execution — often preferred for the largest bores and for shock/vibration duty where a rigid machined cage matters; W33 adds the relubrication groove. The sealed 2CS5 and vibrating-screen VA405 are separate executions. Catalogue mass 265000 g for the 400×650×200 mm open execution covers the a one-piece machined brass cage guided on the inner ring (CA design); tapered-bore and sealed variants differ in mass and carry their own order numbers. For relubrication, route the grease duct to the outer-ring W33 groove position where fitted, and purge until fresh grease appears at the seal — the 200 mm width across two roller rows needs the full charge.", "applications": [ "large dredger and marine winch drums", "steel-plant continuous-caster segments", "large induced-draft fan rotors", "SAG and ball-mill drive shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals" ], "pitfalls": [ "At 400 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23100-series series at 400 mm bore (650×200 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.", "The 23180 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 4864/7650 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "Shaft and housing fillets must clear the bearing chamfer so the 200 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 4864/7650 kN ratings are SKF catalogue values for this exact execution (23180 CA/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23180 (cylindrical bore as listed, tapered-bore 23180 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23180 CA/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23180?", "a": "The 23180 CA/W33 is a double-row spherical roller bearing with 400 mm bore, 650 mm outer diameter and 200 mm width (15.748 × 25.591 × 7.874 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 4864 kN, C0 7650 kN, fatigue load limit Pu 530 kN, reference speed 530 r/min, limiting speed 950 r/min, mass about 265000 g. It is an open, self-aligning bearing with a one-piece machined brass cage guided on the inner ring (CA design)." }, { "q": "How does the 23180 bore code work?", "a": "The last two digits of 23180 are bore code 80, so 80 × 5 = 400 mm bore. The 650 mm OD and 200 mm width come from the ISO 15 dimension-series plan (dimension series 31 (medium OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CA/W33 suffix mean on 23180?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23180 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23180K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23180 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23180", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23180-CAK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on OH3180 adapter sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C3180-M", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3180 M shares the 400×650×200 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C3180-KM", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3180 KM shares the 400×650×200 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23180", "23180 CA/W33" ], "locale_variants": {} }, { "sku": "23184", "brand": "SKF", "manufacturer_designation": "SKF 23184 CJ/W33", "series": "23100-series", "type": "spherical_roller", "d_mm": 420, "D_mm": 700, "B_mm": 224, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5919, "static_load_kN": 9300, "fatigue_load_limit_kN": 620, "max_rpm": 900, "reference_speed_rpm": 480, "limiting_speed_rpm": 900, "weight_g": 350000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF 23184 (23184 CJ/W33) is the spherical-roller choice for a 420 mm shaft — barrel rollers between an inner ring with two raceways and a common sphered outer raceway inside the 700×224 mm ISO 15 envelope. The code breaks down as type digit 2 (double-row spherical roller), dimension series 31 (dimension series 31 (medium OD, wide)), and bore code 84 = 420 mm; dimensions 420×700×224 mm therefore match the ISO 15 envelope. In SKF suffix language, CJ/W33 is the newer stamped-window-steel-cage execution; it replaces many CC applications with lower friction, while the sealed 2CS5 and vibrating-screen VA405 remain separate order numbers. The 620 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.57 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. After mounting, swing the outer ring to confirm free self-alignment: the 23184 should tilt through its full catalogue misalignment range without binding; a stiff joint signals a cocked seat or shoulder interference.", "applications": [ "steel-plant continuous-caster segments", "large induced-draft fan rotors", "SAG and ball-mill drive shafts", "large mining crusher main shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals" ], "pitfalls": [ "At 420 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23100-series series at 420 mm bore (700×224 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "Catalogue reference speed and limiting speed are different limits: the 480 r/min reference is a thermal criterion under load, while the 900 r/min limiting value is the mechanical ceiling — observe both.", "The 5919/9300 kN ratings are SKF catalogue values for this exact execution (23184 CJ/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23184 (cylindrical bore as listed, tapered-bore 23184 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23184 CJ/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23184?", "a": "The 23184 CJ/W33 is a double-row spherical roller bearing with 420 mm bore, 700 mm outer diameter and 224 mm width (16.535 × 27.559 × 8.819 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 5919 kN, C0 9300 kN, fatigue load limit Pu 620 kN, reference speed 480 r/min, limiting speed 900 r/min, mass about 350000 g. It is an open, self-aligning bearing with a stamped sheet-steel window-type cage with low-friction guidance (CJ design)." }, { "q": "How does the 23184 bore code work?", "a": "The last two digits of 23184 are bore code 84, so 84 × 5 = 420 mm bore. The 700 mm OD and 224 mm width come from the ISO 15 dimension-series plan (dimension series 31 (medium OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CJ/W33 suffix mean on 23184?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23184 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23184K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23184 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23184", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23184-CKJ-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on OH3184 adapter sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C3184-M", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 3184 M shares the 420×700×224 mm envelope but catalogue C/C0 differ (6000/10400 kN vs 5919/9300 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C3184-KM", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 3184 KM shares the 420×700×224 mm envelope but catalogue C/C0 differ (6000/10400 kN vs 5919/9300 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23184", "23184 CJ/W33" ], "locale_variants": {} }, { "sku": "23188", "brand": "SKF", "manufacturer_designation": "SKF 23188 CA/W33", "series": "23100-series", "type": "spherical_roller", "d_mm": 440, "D_mm": 720, "B_mm": 226, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass_machined_M1", "dynamic_load_kN": 6215, "static_load_kN": 10000, "fatigue_load_limit_kN": 670, "max_rpm": 850, "reference_speed_rpm": 450, "limiting_speed_rpm": 850, "weight_g": 360000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 23188 appears as 23188 CA/W33: an open, double-row spherical roller bearing, self-aligning by virtue of the sphered outer raceway, sized 440×720×226 mm to the ISO 15 boundary plan. On the SKF nameplate, 23188 follows the ISO 15 convention: 2 for the spherical roller type, 31 for the dimension series 31 (medium OD, wide), final digits 88 for the 440 mm bore. In SKF suffix language, CA/W33 means the brass-cage CA execution — often preferred for the largest bores and for shock/vibration duty where a rigid machined cage matters; W33 adds the relubrication groove. The sealed 2CS5 and vibrating-screen VA405 are separate executions. At 450 r/min reference speed the 140.0 mm-section 23188 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 850 r/min as the mechanical ceiling. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.", "applications": [ "large induced-draft fan rotors", "SAG and ball-mill drive shafts", "large mining crusher main shafts", "wind-turbine main shaft support" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals" ], "pitfalls": [ "At 440 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23100-series series at 440 mm bore (720×226 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.", "Shaft and housing fillets must clear the bearing chamfer so the 226 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 360000 g mass and 226 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23188.", "The 6215/10000 kN ratings are SKF catalogue values for this exact execution (23188 CA/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23188 (cylindrical bore as listed, tapered-bore 23188 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23188 CA/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23188?", "a": "The 23188 CA/W33 is a double-row spherical roller bearing with 440 mm bore, 720 mm outer diameter and 226 mm width (17.323 × 28.346 × 8.898 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 6215 kN, C0 10000 kN, fatigue load limit Pu 670 kN, reference speed 450 r/min, limiting speed 850 r/min, mass about 360000 g. It is an open, self-aligning bearing with a one-piece machined brass cage guided on the inner ring (CA design)." }, { "q": "How does the 23188 bore code work?", "a": "The last two digits of 23188 are bore code 88, so 88 × 5 = 440 mm bore. The 720 mm OD and 226 mm width come from the ISO 15 dimension-series plan (dimension series 31 (medium OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CA/W33 suffix mean on 23188?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23188 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23188K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23188 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23188", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23188-CAK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on OH3188 adapter sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C3188-MB", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 3188 MB shares the 440×720×226 mm envelope but catalogue C/C0 differ (6700/11400 kN vs 6215/10000 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C3188-KMB", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 3188 KMB shares the 440×720×226 mm envelope but catalogue C/C0 differ (6700/11400 kN vs 6215/10000 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23188", "23188 CA/W33" ], "locale_variants": {} }, { "sku": "23192", "brand": "SKF", "manufacturer_designation": "SKF 23192 CA/W33", "series": "23100-series", "type": "spherical_roller", "d_mm": 460, "D_mm": 760, "B_mm": 240, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass_machined_M1", "dynamic_load_kN": 6760, "static_load_kN": 10800, "fatigue_load_limit_kN": 680, "max_rpm": 800, "reference_speed_rpm": 430, "limiting_speed_rpm": 800, "weight_g": 440000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number 23192 CA/W33 in SKF catalogue PUB BU/P1 17000 denotes a double-row spherical roller bearing for a 460 mm shaft, dimension series 31 (medium OD, wide), with open execution and a one-piece machined brass cage guided on the inner ring (CA design). The code breaks down as type digit 2 (double-row spherical roller), dimension series 31 (dimension series 31 (medium OD, wide)), and bore code 92 = 460 mm; dimensions 460×760×240 mm therefore match the ISO 15 envelope. In SKF suffix language, CA/W33 means the brass-cage CA execution — often preferred for the largest bores and for shock/vibration duty where a rigid machined cage matters; W33 adds the relubrication groove. The sealed 2CS5 and vibrating-screen VA405 are separate executions. The 150.0 mm radial section height ((760−460)/2) and 440000 g catalogue mass frame a 460 mm bore bearing rated at 6760 kN C — roughly 14.70 kN of dynamic capacity per millimetre of bore before application factors. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.", "applications": [ "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "steel-plant continuous-caster segments" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "smearing on the roller-raceway contact during skid starts below the minimum load" ], "pitfalls": [ "At 460 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23100-series series at 460 mm bore (760×240 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 6760/10800 kN ratings are SKF catalogue values for this exact execution (23192 CA/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23192 (cylindrical bore as listed, tapered-bore 23192 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23192 CA/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23192?", "a": "The 23192 CA/W33 is a double-row spherical roller bearing with 460 mm bore, 760 mm outer diameter and 240 mm width (18.11 × 29.921 × 9.449 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 6760 kN, C0 10800 kN, fatigue load limit Pu 680 kN, reference speed 430 r/min, limiting speed 800 r/min, mass about 440000 g. It is an open, self-aligning bearing with a one-piece machined brass cage guided on the inner ring (CA design)." }, { "q": "How does the 23192 bore code work?", "a": "The last two digits of 23192 are bore code 92, so 92 × 5 = 460 mm bore. The 760 mm OD and 240 mm width come from the ISO 15 dimension-series plan (dimension series 31 (medium OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CA/W33 suffix mean on 23192?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23192 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23192K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23192 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23192", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23192-CAK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on AOHX3192 withdrawal sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C3192-M", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 3192 M shares the 460×760×240 mm envelope but catalogue C/C0 differ (6800/12000 kN vs 6760/10800 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C3192-KM", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 3192 KM shares the 460×760×240 mm envelope but catalogue C/C0 differ (6800/12000 kN vs 6760/10800 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23192", "23192 CA/W33" ], "locale_variants": {} }, { "sku": "23196", "brand": "SKF", "manufacturer_designation": "SKF 23196 CA/W33", "series": "23100-series", "type": "spherical_roller", "d_mm": 480, "D_mm": 790, "B_mm": 248, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass_machined_M1", "dynamic_load_kN": 7362, "static_load_kN": 12000, "fatigue_load_limit_kN": 780, "max_rpm": 750, "reference_speed_rpm": 400, "limiting_speed_rpm": 750, "weight_g": 485000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "23196 CA/W33 belongs to the SKF spherical roller range — the 480 mm bore entry in the 23100-series series (dimension series 31 (medium OD, wide)), dimensioned 790 mm OD and 248 mm wide. On the SKF nameplate, 23196 follows the ISO 15 convention: 2 for the spherical roller type, 31 for the dimension series 31 (medium OD, wide), final digits 96 for the 480 mm bore. In SKF suffix language, CA/W33 means the brass-cage CA execution — often preferred for the largest bores and for shock/vibration duty where a rigid machined cage matters; W33 adds the relubrication groove. The sealed 2CS5 and vibrating-screen VA405 are separate executions. With C 7362 kN and C0 12000 kN, the 23196 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 23196 CCK/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.", "applications": [ "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "steel-plant continuous-caster segments", "large induced-draft fan rotors" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "smearing on the roller-raceway contact during skid starts below the minimum load" ], "pitfalls": [ "At 480 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23100-series series at 480 mm bore (790×248 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.", "Shaft and housing fillets must clear the bearing chamfer so the 248 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "Shaft and housing fillets must clear the bearing chamfer so the 248 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 7362/12000 kN ratings are SKF catalogue values for this exact execution (23196 CA/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23196 (cylindrical bore as listed, tapered-bore 23196 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23196 CA/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23196?", "a": "The 23196 CA/W33 is a double-row spherical roller bearing with 480 mm bore, 790 mm outer diameter and 248 mm width (18.898 × 31.102 × 9.764 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 7362 kN, C0 12000 kN, fatigue load limit Pu 780 kN, reference speed 400 r/min, limiting speed 750 r/min, mass about 485000 g. It is an open, self-aligning bearing with a one-piece machined brass cage guided on the inner ring (CA design)." }, { "q": "How does the 23196 bore code work?", "a": "The last two digits of 23196 are bore code 96, so 96 × 5 = 480 mm bore. The 790 mm OD and 248 mm width come from the ISO 15 dimension-series plan (dimension series 31 (medium OD, wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CA/W33 suffix mean on 23196?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23196 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23196K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23196 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23196", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23196-CAK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on AOHX3196 withdrawal sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C3196-MB", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3196 MB shares the 480×790×248 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C3196-KMB", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3196 KMB shares the 480×790×248 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23196", "23196 CA/W33" ], "locale_variants": {} }, { "sku": "23218", "brand": "SKF", "manufacturer_designation": "SKF 23218 CC/W33", "series": "23200-series", "type": "spherical_roller", "d_mm": 90, "D_mm": 160, "B_mm": 52.4, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 372, "static_load_kN": 440, "fatigue_load_limit_kN": 48, "max_rpm": 3800, "reference_speed_rpm": 2800, "limiting_speed_rpm": 3800, "weight_g": 4650, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 90 mm shaft carrying heavy radial load with misalignment or deflection, SKF lists 23218 under catalogue execution 23218 CC/W33: two barrel-roller rows on a sphered outer raceway. Digit by digit, 23218 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 32, and bore reference 18 resolving to 90 mm; 160 mm OD and 52.4 mm width are the matching ISO 15 boundary values. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. Catalogue mass 4650 g for the 90×160×52.4 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.", "applications": [ "marine propulsion and thruster shafts", "cement-mill trunnion and drive shafts", "heavy conveyor head shafts in mining", "jaw and cone crusher main shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Mount the 90 mm bore 23218 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 23200-series series at 90 mm bore (160×52.4 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 52.4 mm width changes abutment spacing, even though the 160 mm OD matches.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23218 pits long before its L10 life.", "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23218; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 372/440 kN ratings are SKF catalogue values for this exact execution (23218 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23218 (cylindrical bore as listed, tapered-bore 23218 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23218 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23218?", "a": "The 23218 CC/W33 is a double-row spherical roller bearing with 90 mm bore, 160 mm outer diameter and 52.4 mm width (3.543 × 6.299 × 2.063 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 372 kN, C0 440 kN, fatigue load limit Pu 48 kN, reference speed 2,800 r/min, limiting speed 3,800 r/min, mass about 4650 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23218 bore code work?", "a": "The last two digits of 23218 are bore code 18, so 18 × 5 = 90 mm bore. The 160 mm OD and 52.4 mm width come from the ISO 15 dimension-series plan (dimension series 32 (medium OD, extra wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23218?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23218 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23218K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23218 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23218", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23218-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H2318 adapter sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23218", "23218 CC/W33" ], "locale_variants": {} }, { "sku": "23220", "brand": "SKF", "manufacturer_designation": "SKF 23220 CC/W33", "series": "23200-series", "type": "spherical_roller", "d_mm": 100, "D_mm": 180, "B_mm": 60.3, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 498, "static_load_kN": 600, "fatigue_load_limit_kN": 63, "max_rpm": 3400, "reference_speed_rpm": 2400, "limiting_speed_rpm": 3400, "weight_g": 6850, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number 23220 CC/W33 in SKF catalogue PUB BU/P1 17000 denotes a double-row spherical roller bearing for a 100 mm shaft, dimension series 32 (medium OD, extra wide), with open execution and two pressed-steel cages with a floating guide ring. Reading the designation: the leading 2 marks a spherical roller bearing, the 32 is the ISO 15 dimension series (dimension series 32 (medium OD, extra wide)), and the last two digits encode the 100 mm bore; the 180 mm OD and 60.3 mm width follow the ISO 15 general plan. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. With C 498 kN and C0 600 kN, the 23220 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. Mount with the spherical bearing's self-alignment in mind: it compensates ≈ 0.5–2.5° of misalignment depending on series, but the shaft and housing seats still set the datum — a rotating inner ring on a 100 mm shaft typically takes a k5 seat with an H7 housing bore.", "applications": [ "large vibrating screens and feeders", "marine propulsion and thruster shafts", "cement-mill trunnion and drive shafts", "heavy conveyor head shafts in mining" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "smearing on the roller-raceway contact during skid starts below the minimum load" ], "pitfalls": [ "Mount the 100 mm bore 23220 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 23200-series series at 100 mm bore (180×60.3 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 60.3 mm width changes abutment spacing, even though the 180 mm OD matches.", "The 23220 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 498/600 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23220; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 498/600 kN ratings are SKF catalogue values for this exact execution (23220 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23220 (cylindrical bore as listed, tapered-bore 23220 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23220 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23220?", "a": "The 23220 CC/W33 is a double-row spherical roller bearing with 100 mm bore, 180 mm outer diameter and 60.3 mm width (3.937 × 7.087 × 2.374 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 498 kN, C0 600 kN, fatigue load limit Pu 63 kN, reference speed 2,400 r/min, limiting speed 3,400 r/min, mass about 6850 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23220 bore code work?", "a": "The last two digits of 23220 are bore code 20, so 20 × 5 = 100 mm bore. The 180 mm OD and 60.3 mm width come from the ISO 15 dimension-series plan (dimension series 32 (medium OD, extra wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23220?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23220 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23220K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23220 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23220", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23220-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H2320 adapter sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23220", "23220 CC/W33" ], "locale_variants": {} }, { "sku": "23222", "brand": "SKF", "manufacturer_designation": "SKF 23222 CC/W33", "series": "23200-series", "type": "spherical_roller", "d_mm": 110, "D_mm": 200, "B_mm": 69.8, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 626, "static_load_kN": 765, "fatigue_load_limit_kN": 76.5, "max_rpm": 3200, "reference_speed_rpm": 2200, "limiting_speed_rpm": 3200, "weight_g": 9850, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 23222 CC/W33 is a 110×200×69.8 mm spherical roller bearing — the dimension series 32 (medium OD, extra wide) entry for a 110 mm shaft, with two rows of symmetrical barrel rollers for combined radial and axial load. Numbering ties the bearing to its envelope: 23222 means spherical-roller type, dimension series 32, 110 mm bore — which is why the 200×69.8 mm outline swaps dimensionally with other ISO 15 bearings of the same code. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. Selection arithmetic: the C0/C ratio is about 1.22 (static 765 kN against dynamic 626 kN), typical of a spherical roller sized for heavy combined loads, and the 76.5 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.", "applications": [ "jaw and cone crusher main shafts", "paper-machine press and dryer rolls", "rolling-mill pinion and back-up shafts", "large vibrating screens and feeders" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Mount the 110 mm bore 23222 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 23200-series series at 110 mm bore (200×69.8 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 69.8 mm width changes abutment spacing, even though the 200 mm OD matches.", "The 9850 g mass and 69.8 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23222.", "Catalogue reference speed and limiting speed are different limits: the 2,200 r/min reference is a thermal criterion under load, while the 3,200 r/min limiting value is the mechanical ceiling — observe both.", "The 626/765 kN ratings are SKF catalogue values for this exact execution (23222 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23222 (cylindrical bore as listed, tapered-bore 23222 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23222 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23222?", "a": "The 23222 CC/W33 is a double-row spherical roller bearing with 110 mm bore, 200 mm outer diameter and 69.8 mm width (4.331 × 7.874 × 2.748 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 626 kN, C0 765 kN, fatigue load limit Pu 76.5 kN, reference speed 2,200 r/min, limiting speed 3,200 r/min, mass about 9850 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23222 bore code work?", "a": "The last two digits of 23222 are bore code 22, so 22 × 5 = 110 mm bore. The 200 mm OD and 69.8 mm width come from the ISO 15 dimension-series plan (dimension series 32 (medium OD, extra wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23222?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23222 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23222K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23222 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23222", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23222-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H2322 adapter sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23222", "23222 CC/W33" ], "locale_variants": {} }, { "sku": "23224", "brand": "SKF", "manufacturer_designation": "SKF 23224 CC/W33", "series": "23200-series", "type": "spherical_roller", "d_mm": 120, "D_mm": 215, "B_mm": 76, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 732, "static_load_kN": 930, "fatigue_load_limit_kN": 93, "max_rpm": 2800, "reference_speed_rpm": 2000, "limiting_speed_rpm": 2800, "weight_g": 12000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "23224 CC/W33 belongs to the SKF spherical roller range — the 120 mm bore entry in the 23200-series series (dimension series 32 (medium OD, extra wide)), dimensioned 215 mm OD and 76 mm wide. The code breaks down as type digit 2 (double-row spherical roller), dimension series 32 (dimension series 32 (medium OD, extra wide)), and bore code 24 = 120 mm; dimensions 120×215×76 mm therefore match the ISO 15 envelope. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. Catalogue mass 12000 g for the 120×215×76 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. A 120 mm rotating inner ring usually runs m6 on the shaft with H7 in the housing; for vibrating-screen duty the outer ring is instead held tight and the shaft seat loosened — follow the screen builder's fit schedule.", "applications": [ "large dredger and marine winch drums", "steel-plant continuous-caster segments", "large induced-draft fan rotors", "SAG and ball-mill drive shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "smearing on the roller-raceway contact during skid starts below the minimum load" ], "pitfalls": [ "At 120 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23200-series series at 120 mm bore (215×76 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 76 mm width changes abutment spacing, even though the 215 mm OD matches.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 23224 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 732/930 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The 732/930 kN ratings are SKF catalogue values for this exact execution (23224 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23224 (cylindrical bore as listed, tapered-bore 23224 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23224 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23224?", "a": "The 23224 CC/W33 is a double-row spherical roller bearing with 120 mm bore, 215 mm outer diameter and 76 mm width (4.724 × 8.465 × 2.992 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 732 kN, C0 930 kN, fatigue load limit Pu 93 kN, reference speed 2,000 r/min, limiting speed 2,800 r/min, mass about 12000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23224 bore code work?", "a": "The last two digits of 23224 are bore code 24, so 24 × 5 = 120 mm bore. The 215 mm OD and 76 mm width come from the ISO 15 dimension-series plan (dimension series 32 (medium OD, extra wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23224?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23224 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23224K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23224 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23224", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23224-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on AHX3224 withdrawal sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C3224", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3224 shares the 120×215×76 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C3224-K", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3224 K shares the 120×215×76 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23224", "23224 CC/W33" ], "locale_variants": {} }, { "sku": "23226", "brand": "SKF", "manufacturer_designation": "SKF 23226 CC/W33", "series": "23200-series", "type": "spherical_roller", "d_mm": 130, "D_mm": 230, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 826, "static_load_kN": 1060, "fatigue_load_limit_kN": 104, "max_rpm": 2600, "reference_speed_rpm": 1900, "limiting_speed_rpm": 2600, "weight_g": 14500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF 23226 (23226 CC/W33) is the spherical-roller choice for a 130 mm shaft — barrel rollers between an inner ring with two raceways and a common sphered outer raceway inside the 230×80 mm ISO 15 envelope. Digit by digit, 23226 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 32, and bore reference 26 resolving to 130 mm; 230 mm OD and 80 mm width are the matching ISO 15 boundary values. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. Speed planning uses two different ceilings: 1,900 r/min thermal reference and 2,600 r/min mechanical limiting speed. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 23226 CCK/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.", "applications": [ "large mining crusher main shafts", "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "At 130 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23200-series series at 130 mm bore (230×80 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 80 mm width changes abutment spacing, even though the 230 mm OD matches.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23226 pits long before its L10 life.", "The 14500 g mass and 80 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23226.", "The 826/1060 kN ratings are SKF catalogue values for this exact execution (23226 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23226 (cylindrical bore as listed, tapered-bore 23226 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23226 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23226?", "a": "The 23226 CC/W33 is a double-row spherical roller bearing with 130 mm bore, 230 mm outer diameter and 80 mm width (5.118 × 9.055 × 3.15 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 826 kN, C0 1060 kN, fatigue load limit Pu 104 kN, reference speed 1,900 r/min, limiting speed 2,600 r/min, mass about 14500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23226 bore code work?", "a": "The last two digits of 23226 are bore code 26, so 26 × 5 = 130 mm bore. The 230 mm OD and 80 mm width come from the ISO 15 dimension-series plan (dimension series 32 (medium OD, extra wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23226?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23226 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23226K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23226 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23226", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23226-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on AHX3226 withdrawal sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23226", "23226 CC/W33" ], "locale_variants": {} }, { "sku": "23228", "brand": "SKF", "manufacturer_designation": "SKF 23228 CC/W33", "series": "23200-series", "type": "spherical_roller", "d_mm": 140, "D_mm": 250, "B_mm": 88, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 962, "static_load_kN": 1250, "fatigue_load_limit_kN": 120, "max_rpm": 2400, "reference_speed_rpm": 1700, "limiting_speed_rpm": 2400, "weight_g": 19000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "23228 is a double-row spherical roller bearing in the 23200-series family: two rows of barrel rollers on a common sphered outer raceway, self-aligning under shaft deflection, listed by SKF in SKF catalogue PUB BU/P1 17000. On the SKF nameplate, 23228 follows the ISO 15 convention: 2 for the spherical roller type, 32 for the dimension series 32 (medium OD, extra wide), final digits 28 for the 140 mm bore. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. The 120 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.30 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. For relubrication, route the grease duct to the outer-ring W33 groove position where fitted, and purge until fresh grease appears at the seal — the 88 mm width across two roller rows needs the full charge.", "applications": [ "steel-plant continuous-caster segments", "large induced-draft fan rotors", "SAG and ball-mill drive shafts", "large mining crusher main shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "smearing on the roller-raceway contact during skid starts below the minimum load" ], "pitfalls": [ "At 140 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23200-series series at 140 mm bore (250×88 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 88 mm width changes abutment spacing, even though the 250 mm OD matches.", "Shaft and housing fillets must clear the bearing chamfer so the 88 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 962/1250 kN ratings are SKF catalogue values for this exact execution (23228 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23228 (cylindrical bore as listed, tapered-bore 23228 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23228 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23228?", "a": "The 23228 CC/W33 is a double-row spherical roller bearing with 140 mm bore, 250 mm outer diameter and 88 mm width (5.512 × 9.843 × 3.465 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 962 kN, C0 1250 kN, fatigue load limit Pu 120 kN, reference speed 1,700 r/min, limiting speed 2,400 r/min, mass about 19000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23228 bore code work?", "a": "The last two digits of 23228 are bore code 28, so 28 × 5 = 140 mm bore. The 250 mm OD and 88 mm width come from the ISO 15 dimension-series plan (dimension series 32 (medium OD, extra wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23228?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23228 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23228K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23228 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23228", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23228-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on AHX3228 withdrawal sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23228", "23228 CC/W33" ], "locale_variants": {} }, { "sku": "23230", "brand": "SKF", "manufacturer_designation": "SKF 23230 CC/W33", "series": "23200-series", "type": "spherical_roller", "d_mm": 150, "D_mm": 270, "B_mm": 96, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1129, "static_load_kN": 1460, "fatigue_load_limit_kN": 137, "max_rpm": 2200, "reference_speed_rpm": 1600, "limiting_speed_rpm": 2200, "weight_g": 24500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 23230 appears as 23230 CC/W33: an open, double-row spherical roller bearing, self-aligning by virtue of the sphered outer raceway, sized 150×270×96 mm to the ISO 15 boundary plan. Numbering ties the bearing to its envelope: 23230 means spherical-roller type, dimension series 32, 150 mm bore — which is why the 270×96 mm outline swaps dimensionally with other ISO 15 bearings of the same code. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. Catalogue mass 24500 g for the 150×270×96 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 23230 CCK/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.", "applications": [ "large dredger and marine winch drums", "steel-plant continuous-caster segments", "large induced-draft fan rotors", "SAG and ball-mill drive shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals" ], "pitfalls": [ "At 150 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23200-series series at 150 mm bore (270×96 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 96 mm width changes abutment spacing, even though the 270 mm OD matches.", "The 24500 g mass and 96 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23230.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 1129/1460 kN ratings are SKF catalogue values for this exact execution (23230 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23230 (cylindrical bore as listed, tapered-bore 23230 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23230 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23230?", "a": "The 23230 CC/W33 is a double-row spherical roller bearing with 150 mm bore, 270 mm outer diameter and 96 mm width (5.906 × 10.63 × 3.78 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1129 kN, C0 1460 kN, fatigue load limit Pu 137 kN, reference speed 1,600 r/min, limiting speed 2,200 r/min, mass about 24500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23230 bore code work?", "a": "The last two digits of 23230 are bore code 30, so 30 × 5 = 150 mm bore. The 270 mm OD and 96 mm width come from the ISO 15 dimension-series plan (dimension series 32 (medium OD, extra wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23230?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23230 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23230K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23230 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23230", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23230-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H2330 adapter sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23230", "23230 CC/W33" ], "locale_variants": {} }, { "sku": "23232", "brand": "SKF", "manufacturer_designation": "SKF 23232 CC/W33", "series": "23200-series", "type": "spherical_roller", "d_mm": 160, "D_mm": 290, "B_mm": 104, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1281, "static_load_kN": 1660, "fatigue_load_limit_kN": 153, "max_rpm": 2200, "reference_speed_rpm": 1500, "limiting_speed_rpm": 2200, "weight_g": 31000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 160 mm shaft carrying heavy radial load with misalignment or deflection, SKF lists 23232 under catalogue execution 23232 CC/W33: two barrel-roller rows on a sphered outer raceway. The code breaks down as type digit 2 (double-row spherical roller), dimension series 32 (dimension series 32 (medium OD, extra wide)), and bore code 32 = 160 mm; dimensions 160×290×104 mm therefore match the ISO 15 envelope. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. Speed planning uses two different ceilings: 1,500 r/min thermal reference and 2,200 r/min mechanical limiting speed. For relubrication, route the grease duct to the outer-ring W33 groove position where fitted, and purge until fresh grease appears at the seal — the 104 mm width across two roller rows needs the full charge.", "applications": [ "large mining crusher main shafts", "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "At 160 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23200-series series at 160 mm bore (290×104 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 104 mm width changes abutment spacing, even though the 290 mm OD matches.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23232 pits long before its L10 life.", "The 1281/1660 kN ratings are SKF catalogue values for this exact execution (23232 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23232 (cylindrical bore as listed, tapered-bore 23232 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23232 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23232?", "a": "The 23232 CC/W33 is a double-row spherical roller bearing with 160 mm bore, 290 mm outer diameter and 104 mm width (6.299 × 11.417 × 4.094 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1281 kN, C0 1660 kN, fatigue load limit Pu 153 kN, reference speed 1,500 r/min, limiting speed 2,200 r/min, mass about 31000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23232 bore code work?", "a": "The last two digits of 23232 are bore code 32, so 32 × 5 = 160 mm bore. The 290 mm OD and 104 mm width come from the ISO 15 dimension-series plan (dimension series 32 (medium OD, extra wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23232?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23232 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23232K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23232 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23232", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23232-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H2332 adapter sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C3232", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 3232 shares the 160×290×104 mm envelope but catalogue C/C0 differ (1370/1830 kN vs 1281/1660 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C3232-K", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 3232 K shares the 160×290×104 mm envelope but catalogue C/C0 differ (1370/1830 kN vs 1281/1660 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23232", "23232 CC/W33" ], "locale_variants": {} }, { "sku": "23234", "brand": "SKF", "manufacturer_designation": "SKF 23234 CC/W33", "series": "23200-series", "type": "spherical_roller", "d_mm": 170, "D_mm": 310, "B_mm": 110, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1472, "static_load_kN": 1930, "fatigue_load_limit_kN": 173, "max_rpm": 2000, "reference_speed_rpm": 1400, "limiting_speed_rpm": 2000, "weight_g": 37500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number 23234 CC/W33 in SKF catalogue PUB BU/P1 17000 denotes a double-row spherical roller bearing for a 170 mm shaft, dimension series 32 (medium OD, extra wide), with open execution and two pressed-steel cages with a floating guide ring. Digit by digit, 23234 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 32, and bore reference 34 resolving to 170 mm; 310 mm OD and 110 mm width are the matching ISO 15 boundary values. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. The 173 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.31 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. Drive-on force must go through the ring being fitted: press or induction-heat the inner ring onto the 170 mm shaft (max 120 °C) and never transmit mounting force through the roller complement, or the raceways brinell.", "applications": [ "steel-plant continuous-caster segments", "large induced-draft fan rotors", "SAG and ball-mill drive shafts", "large mining crusher main shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals" ], "pitfalls": [ "At 170 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23200-series series at 170 mm bore (310×110 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 110 mm width changes abutment spacing, even though the 310 mm OD matches.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23234 pits long before its L10 life.", "Shaft and housing fillets must clear the bearing chamfer so the 110 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 1472/1930 kN ratings are SKF catalogue values for this exact execution (23234 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23234 (cylindrical bore as listed, tapered-bore 23234 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23234 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23234?", "a": "The 23234 CC/W33 is a double-row spherical roller bearing with 170 mm bore, 310 mm outer diameter and 110 mm width (6.693 × 12.205 × 4.331 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1472 kN, C0 1930 kN, fatigue load limit Pu 173 kN, reference speed 1,400 r/min, limiting speed 2,000 r/min, mass about 37500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23234 bore code work?", "a": "The last two digits of 23234 are bore code 34, so 34 × 5 = 170 mm bore. The 310 mm OD and 110 mm width come from the ISO 15 dimension-series plan (dimension series 32 (medium OD, extra wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23234?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23234 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23234K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23234 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23234", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23234-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H2334 adapter sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23234", "23234 CC/W33" ], "locale_variants": {} }, { "sku": "23236", "brand": "SKF", "manufacturer_designation": "SKF 23236 CC/W33", "series": "23200-series", "type": "spherical_roller", "d_mm": 180, "D_mm": 320, "B_mm": 112, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1557, "static_load_kN": 2120, "fatigue_load_limit_kN": 186, "max_rpm": 1900, "reference_speed_rpm": 1300, "limiting_speed_rpm": 1900, "weight_g": 39500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 23236 CC/W33 is a 180×320×112 mm spherical roller bearing — the dimension series 32 (medium OD, extra wide) entry for a 180 mm shaft, with two rows of symmetrical barrel rollers for combined radial and axial load. On the SKF nameplate, 23236 follows the ISO 15 convention: 2 for the spherical roller type, 32 for the dimension series 32 (medium OD, extra wide), final digits 36 for the 180 mm bore. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. The 70.0 mm radial section height ((320−180)/2) and 39500 g catalogue mass frame a 180 mm bore bearing rated at 1557 kN C — roughly 8.65 kN of dynamic capacity per millimetre of bore before application factors. After mounting, swing the outer ring to confirm free self-alignment: the 23236 should tilt through its full catalogue misalignment range without binding; a stiff joint signals a cocked seat or shoulder interference.", "applications": [ "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "steel-plant continuous-caster segments" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "At 180 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23200-series series at 180 mm bore (320×112 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 112 mm width changes abutment spacing, even though the 320 mm OD matches.", "Shaft and housing fillets must clear the bearing chamfer so the 112 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23236; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 1557/2120 kN ratings are SKF catalogue values for this exact execution (23236 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23236 (cylindrical bore as listed, tapered-bore 23236 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23236 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23236?", "a": "The 23236 CC/W33 is a double-row spherical roller bearing with 180 mm bore, 320 mm outer diameter and 112 mm width (7.087 × 12.598 × 4.409 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1557 kN, C0 2120 kN, fatigue load limit Pu 186 kN, reference speed 1,300 r/min, limiting speed 1,900 r/min, mass about 39500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23236 bore code work?", "a": "The last two digits of 23236 are bore code 36, so 36 × 5 = 180 mm bore. The 320 mm OD and 112 mm width come from the ISO 15 dimension-series plan (dimension series 32 (medium OD, extra wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23236?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23236 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23236K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23236 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23236", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23236-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H2336 adapter sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C3236", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3236 shares the 180×320×112 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C3236-K", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3236 K shares the 180×320×112 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23236", "23236 CC/W33" ], "locale_variants": {} }, { "sku": "23238", "brand": "SKF", "manufacturer_designation": "SKF 23238 CC/W33", "series": "23200-series", "type": "spherical_roller", "d_mm": 190, "D_mm": 340, "B_mm": 120, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1759, "static_load_kN": 2400, "fatigue_load_limit_kN": 208, "max_rpm": 1800, "reference_speed_rpm": 1300, "limiting_speed_rpm": 1800, "weight_g": 48000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "23238 CC/W33 belongs to the SKF spherical roller range — the 190 mm bore entry in the 23200-series series (dimension series 32 (medium OD, extra wide)), dimensioned 340 mm OD and 120 mm wide. Reading the designation: the leading 2 marks a spherical roller bearing, the 32 is the ISO 15 dimension series (dimension series 32 (medium OD, extra wide)), and the last two digits encode the 190 mm bore; the 340 mm OD and 120 mm width follow the ISO 15 general plan. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. At 1,300 r/min reference speed the 75.0 mm-section 23238 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 1,800 r/min as the mechanical ceiling. Mount with the spherical bearing's self-alignment in mind: it compensates ≈ 0.5–2.5° of misalignment depending on series, but the shaft and housing seats still set the datum — a rotating inner ring on a 190 mm shaft typically takes a m6 seat with an H7 housing bore.", "applications": [ "large induced-draft fan rotors", "SAG and ball-mill drive shafts", "large mining crusher main shafts", "wind-turbine main shaft support" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals" ], "pitfalls": [ "At 190 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23200-series series at 190 mm bore (340×120 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 120 mm width changes abutment spacing, even though the 340 mm OD matches.", "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23238; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "Catalogue reference speed and limiting speed are different limits: the 1,300 r/min reference is a thermal criterion under load, while the 1,800 r/min limiting value is the mechanical ceiling — observe both.", "The 1759/2400 kN ratings are SKF catalogue values for this exact execution (23238 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23238 (cylindrical bore as listed, tapered-bore 23238 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23238 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23238?", "a": "The 23238 CC/W33 is a double-row spherical roller bearing with 190 mm bore, 340 mm outer diameter and 120 mm width (7.48 × 13.386 × 4.724 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1759 kN, C0 2400 kN, fatigue load limit Pu 208 kN, reference speed 1,300 r/min, limiting speed 1,800 r/min, mass about 48000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23238 bore code work?", "a": "The last two digits of 23238 are bore code 38, so 38 × 5 = 190 mm bore. The 340 mm OD and 120 mm width come from the ISO 15 dimension-series plan (dimension series 32 (medium OD, extra wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23238?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23238 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23238K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23238 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23238", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23238-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H2338 adapter sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23238", "23238 CC/W33" ], "locale_variants": {} }, { "sku": "23240", "brand": "SKF", "manufacturer_designation": "SKF 23240 CC/W33", "series": "23200-series", "type": "spherical_roller", "d_mm": 200, "D_mm": 360, "B_mm": 128, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1947, "static_load_kN": 2700, "fatigue_load_limit_kN": 228, "max_rpm": 1700, "reference_speed_rpm": 1200, "limiting_speed_rpm": 1700, "weight_g": 58000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF 23240 (23240 CC/W33) is the spherical-roller choice for a 200 mm shaft — barrel rollers between an inner ring with two raceways and a common sphered outer raceway inside the 360×128 mm ISO 15 envelope. The code breaks down as type digit 2 (double-row spherical roller), dimension series 32 (dimension series 32 (medium OD, extra wide)), and bore code 40 = 200 mm; dimensions 200×360×128 mm therefore match the ISO 15 envelope. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. The 228 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.39 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. After mounting, swing the outer ring to confirm free self-alignment: the 23240 should tilt through its full catalogue misalignment range without binding; a stiff joint signals a cocked seat or shoulder interference.", "applications": [ "steel-plant continuous-caster segments", "large induced-draft fan rotors", "SAG and ball-mill drive shafts", "large mining crusher main shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "At 200 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23200-series series at 200 mm bore (360×128 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 128 mm width changes abutment spacing, even though the 360 mm OD matches.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "Catalogue reference speed and limiting speed are different limits: the 1,200 r/min reference is a thermal criterion under load, while the 1,700 r/min limiting value is the mechanical ceiling — observe both.", "The 1947/2700 kN ratings are SKF catalogue values for this exact execution (23240 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23240 (cylindrical bore as listed, tapered-bore 23240 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23240 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23240?", "a": "The 23240 CC/W33 is a double-row spherical roller bearing with 200 mm bore, 360 mm outer diameter and 128 mm width (7.874 × 14.173 × 5.039 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1947 kN, C0 2700 kN, fatigue load limit Pu 228 kN, reference speed 1,200 r/min, limiting speed 1,700 r/min, mass about 58000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23240 bore code work?", "a": "The last two digits of 23240 are bore code 40, so 40 × 5 = 200 mm bore. The 360 mm OD and 128 mm width come from the ISO 15 dimension-series plan (dimension series 32 (medium OD, extra wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23240?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23240 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23240K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23240 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23240", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23240-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on AH3240 withdrawal sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23240", "23240 CC/W33" ], "locale_variants": {} }, { "sku": "23244", "brand": "SKF", "manufacturer_designation": "SKF 23244 CC/W33", "series": "23200-series", "type": "spherical_roller", "d_mm": 220, "D_mm": 400, "B_mm": 144, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2485, "static_load_kN": 3450, "fatigue_load_limit_kN": 285, "max_rpm": 1500, "reference_speed_rpm": 1100, "limiting_speed_rpm": 1500, "weight_g": 81500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 23244 appears as 23244 CC/W33: an open, double-row spherical roller bearing, self-aligning by virtue of the sphered outer raceway, sized 220×400×144 mm to the ISO 15 boundary plan. On the SKF nameplate, 23244 follows the ISO 15 convention: 2 for the spherical roller type, 32 for the dimension series 32 (medium OD, extra wide), final digits 44 for the 220 mm bore. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. At 1,100 r/min reference speed the 90.0 mm-section 23244 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 1,500 r/min as the mechanical ceiling. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.", "applications": [ "large induced-draft fan rotors", "SAG and ball-mill drive shafts", "large mining crusher main shafts", "wind-turbine main shaft support" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "At 220 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23200-series series at 220 mm bore (400×144 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 144 mm width changes abutment spacing, even though the 400 mm OD matches.", "Shaft and housing fillets must clear the bearing chamfer so the 144 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 81500 g mass and 144 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23244.", "The 2485/3450 kN ratings are SKF catalogue values for this exact execution (23244 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23244 (cylindrical bore as listed, tapered-bore 23244 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23244 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23244?", "a": "The 23244 CC/W33 is a double-row spherical roller bearing with 220 mm bore, 400 mm outer diameter and 144 mm width (8.661 × 15.748 × 5.669 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 2485 kN, C0 3450 kN, fatigue load limit Pu 285 kN, reference speed 1,100 r/min, limiting speed 1,500 r/min, mass about 81500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23244 bore code work?", "a": "The last two digits of 23244 are bore code 44, so 44 × 5 = 220 mm bore. The 400 mm OD and 144 mm width come from the ISO 15 dimension-series plan (dimension series 32 (medium OD, extra wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23244?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23244 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23244K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23244 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23244", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23244-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on AOH2344 withdrawal sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23244", "23244 CC/W33" ], "locale_variants": {} }, { "sku": "23248", "brand": "SKF", "manufacturer_designation": "SKF 23248 CC/W33", "series": "23200-series", "type": "spherical_roller", "d_mm": 240, "D_mm": 440, "B_mm": 160, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 3042, "static_load_kN": 4300, "fatigue_load_limit_kN": 345, "max_rpm": 1300, "reference_speed_rpm": 950, "limiting_speed_rpm": 1300, "weight_g": 110000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number 23248 CC/W33 in SKF catalogue PUB BU/P1 17000 denotes a double-row spherical roller bearing for a 240 mm shaft, dimension series 32 (medium OD, extra wide), with open execution and two pressed-steel cages with a floating guide ring. Numbering ties the bearing to its envelope: 23248 means spherical-roller type, dimension series 32, 240 mm bore — which is why the 440×160 mm outline swaps dimensionally with other ISO 15 bearings of the same code. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. Selection arithmetic: the C0/C ratio is about 1.41 (static 4300 kN against dynamic 3042 kN), typical of a spherical roller sized for heavy combined loads, and the 345 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 23248 CCK/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.", "applications": [ "SAG and ball-mill drive shafts", "large mining crusher main shafts", "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "At 240 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23200-series series at 240 mm bore (440×160 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 160 mm width changes abutment spacing, even though the 440 mm OD matches.", "Catalogue reference speed and limiting speed are different limits: the 950 r/min reference is a thermal criterion under load, while the 1,300 r/min limiting value is the mechanical ceiling — observe both.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23248 pits long before its L10 life.", "The 3042/4300 kN ratings are SKF catalogue values for this exact execution (23248 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23248 (cylindrical bore as listed, tapered-bore 23248 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23248 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23248?", "a": "The 23248 CC/W33 is a double-row spherical roller bearing with 240 mm bore, 440 mm outer diameter and 160 mm width (9.449 × 17.323 × 6.299 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 3042 kN, C0 4300 kN, fatigue load limit Pu 345 kN, reference speed 950 r/min, limiting speed 1,300 r/min, mass about 110000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23248 bore code work?", "a": "The last two digits of 23248 are bore code 48, so 48 × 5 = 240 mm bore. The 440 mm OD and 160 mm width come from the ISO 15 dimension-series plan (dimension series 32 (medium OD, extra wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23248?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23248 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23248K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23248 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23248", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23248-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on AOH2348 withdrawal sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23248", "23248 CC/W33" ], "locale_variants": {} }, { "sku": "23252", "brand": "SKF", "manufacturer_designation": "SKF 23252 CC/W33", "series": "23200-series", "type": "spherical_roller", "d_mm": 260, "D_mm": 480, "B_mm": 174, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 3395, "static_load_kN": 4750, "fatigue_load_limit_kN": 360, "max_rpm": 1200, "reference_speed_rpm": 850, "limiting_speed_rpm": 1200, "weight_g": 140000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "23252 CC/W33 belongs to the SKF spherical roller range — the 260 mm bore entry in the 23200-series series (dimension series 32 (medium OD, extra wide)), dimensioned 480 mm OD and 174 mm wide. On the SKF nameplate, 23252 follows the ISO 15 convention: 2 for the spherical roller type, 32 for the dimension series 32 (medium OD, extra wide), final digits 52 for the 260 mm bore. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. With C 3395 kN and C0 4750 kN, the 23252 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 23252 CCK/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.", "applications": [ "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "steel-plant continuous-caster segments", "large induced-draft fan rotors" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals" ], "pitfalls": [ "At 260 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23200-series series at 260 mm bore (480×174 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 174 mm width changes abutment spacing, even though the 480 mm OD matches.", "Shaft and housing fillets must clear the bearing chamfer so the 174 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "Shaft and housing fillets must clear the bearing chamfer so the 174 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 3395/4750 kN ratings are SKF catalogue values for this exact execution (23252 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23252 (cylindrical bore as listed, tapered-bore 23252 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23252 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23252?", "a": "The 23252 CC/W33 is a double-row spherical roller bearing with 260 mm bore, 480 mm outer diameter and 174 mm width (10.236 × 18.898 × 6.85 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 3395 kN, C0 4750 kN, fatigue load limit Pu 360 kN, reference speed 850 r/min, limiting speed 1,200 r/min, mass about 140000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23252 bore code work?", "a": "The last two digits of 23252 are bore code 52, so 52 × 5 = 260 mm bore. The 480 mm OD and 174 mm width come from the ISO 15 dimension-series plan (dimension series 32 (medium OD, extra wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23252?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23252 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23252K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23252 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23252", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23252-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on OH2352 adapter sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23252", "23252 CC/W33" ], "locale_variants": {} }, { "sku": "23256", "brand": "SKF", "manufacturer_designation": "SKF 23256 CC/W33", "series": "23200-series", "type": "spherical_roller", "d_mm": 280, "D_mm": 500, "B_mm": 176, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 3425, "static_load_kN": 4900, "fatigue_load_limit_kN": 365, "max_rpm": 1100, "reference_speed_rpm": 800, "limiting_speed_rpm": 1100, "weight_g": 150000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "23256 is a double-row spherical roller bearing in the 23200-series family: two rows of barrel rollers on a common sphered outer raceway, self-aligning under shaft deflection, listed by SKF in SKF catalogue PUB BU/P1 17000. Numbering ties the bearing to its envelope: 23256 means spherical-roller type, dimension series 32, 280 mm bore — which is why the 500×176 mm outline swaps dimensionally with other ISO 15 bearings of the same code. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. Catalogue mass 150000 g for the 280×500×176 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. Drive-on force must go through the ring being fitted: press or induction-heat the inner ring onto the 280 mm shaft (max 120 °C) and never transmit mounting force through the roller complement, or the raceways brinell.", "applications": [ "large dredger and marine winch drums", "steel-plant continuous-caster segments", "large induced-draft fan rotors", "SAG and ball-mill drive shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals" ], "pitfalls": [ "At 280 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23200-series series at 280 mm bore (500×176 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 176 mm width changes abutment spacing, even though the 500 mm OD matches.", "Catalogue reference speed and limiting speed are different limits: the 800 r/min reference is a thermal criterion under load, while the 1,100 r/min limiting value is the mechanical ceiling — observe both.", "Catalogue reference speed and limiting speed are different limits: the 800 r/min reference is a thermal criterion under load, while the 1,100 r/min limiting value is the mechanical ceiling — observe both.", "The 3425/4900 kN ratings are SKF catalogue values for this exact execution (23256 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23256 (cylindrical bore as listed, tapered-bore 23256 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23256 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23256?", "a": "The 23256 CC/W33 is a double-row spherical roller bearing with 280 mm bore, 500 mm outer diameter and 176 mm width (11.024 × 19.685 × 6.929 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 3425 kN, C0 4900 kN, fatigue load limit Pu 365 kN, reference speed 800 r/min, limiting speed 1,100 r/min, mass about 150000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23256 bore code work?", "a": "The last two digits of 23256 are bore code 56, so 56 × 5 = 280 mm bore. The 500 mm OD and 176 mm width come from the ISO 15 dimension-series plan (dimension series 32 (medium OD, extra wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23256?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23256 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23256K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23256 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23256", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23256-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on OH2356 adapter sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23256", "23256 CC/W33" ], "locale_variants": {} }, { "sku": "23260", "brand": "SKF", "manufacturer_designation": "SKF 23260 CC/W33", "series": "23200-series", "type": "spherical_roller", "d_mm": 300, "D_mm": 540, "B_mm": 192, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4052, "static_load_kN": 5850, "fatigue_load_limit_kN": 425, "max_rpm": 1000, "reference_speed_rpm": 750, "limiting_speed_rpm": 1000, "weight_g": 190000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 300 mm shaft carrying heavy radial load with misalignment or deflection, SKF lists 23260 under catalogue execution 23260 CC/W33: two barrel-roller rows on a sphered outer raceway. On the SKF nameplate, 23260 follows the ISO 15 convention: 2 for the spherical roller type, 32 for the dimension series 32 (medium OD, extra wide), final digits 60 for the 300 mm bore. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. Selection arithmetic: the C0/C ratio is about 1.44 (static 5850 kN against dynamic 4052 kN), typical of a spherical roller sized for heavy combined loads, and the 425 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Drive-on force must go through the ring being fitted: press or induction-heat the inner ring onto the 300 mm shaft (max 120 °C) and never transmit mounting force through the roller complement, or the raceways brinell.", "applications": [ "SAG and ball-mill drive shafts", "large mining crusher main shafts", "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "smearing on the roller-raceway contact during skid starts below the minimum load" ], "pitfalls": [ "At 300 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23200-series series at 300 mm bore (540×192 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 192 mm width changes abutment spacing, even though the 540 mm OD matches.", "Shaft and housing fillets must clear the bearing chamfer so the 192 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 23260 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 4052/5850 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The 4052/5850 kN ratings are SKF catalogue values for this exact execution (23260 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23260 (cylindrical bore as listed, tapered-bore 23260 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23260 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23260?", "a": "The 23260 CC/W33 is a double-row spherical roller bearing with 300 mm bore, 540 mm outer diameter and 192 mm width (11.811 × 21.26 × 7.559 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 4052 kN, C0 5850 kN, fatigue load limit Pu 425 kN, reference speed 750 r/min, limiting speed 1,000 r/min, mass about 190000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23260 bore code work?", "a": "The last two digits of 23260 are bore code 60, so 60 × 5 = 300 mm bore. The 540 mm OD and 192 mm width come from the ISO 15 dimension-series plan (dimension series 32 (medium OD, extra wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23260?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23260 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23260K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23260 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23260", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23260-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on OH3260 adapter sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23260", "23260 CC/W33" ], "locale_variants": {} }, { "sku": "23264", "brand": "SKF", "manufacturer_designation": "SKF 23264 CC/W33", "series": "23200-series", "type": "spherical_roller", "d_mm": 320, "D_mm": 580, "B_mm": 208, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4607, "static_load_kN": 6700, "fatigue_load_limit_kN": 475, "max_rpm": 950, "reference_speed_rpm": 700, "limiting_speed_rpm": 950, "weight_g": 240000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 23264 CC/W33 is a 320×580×208 mm spherical roller bearing — the dimension series 32 (medium OD, extra wide) entry for a 320 mm shaft, with two rows of symmetrical barrel rollers for combined radial and axial load. Numbering ties the bearing to its envelope: 23264 means spherical-roller type, dimension series 32, 320 mm bore — which is why the 580×208 mm outline swaps dimensionally with other ISO 15 bearings of the same code. In SKF suffix language, E marks the optimized high-capacity design and CC/W33 the pressed-steel-cage execution with relubrication groove; both are open bearings — the sealed variant carries the 2CS5 suffix and the vibrating-screen execution VA405. Speed planning uses two different ceilings: 700 r/min thermal reference and 950 r/min mechanical limiting speed. Mount with the spherical bearing's self-alignment in mind: it compensates ≈ 0.5–2.5° of misalignment depending on series, but the shaft and housing seats still set the datum — a rotating inner ring on a 320 mm shaft typically takes a m6 seat with an H7 housing bore.", "applications": [ "large mining crusher main shafts", "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "smearing on the roller-raceway contact during skid starts below the minimum load" ], "pitfalls": [ "At 320 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23200-series series at 320 mm bore (580×208 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 208 mm width changes abutment spacing, even though the 580 mm OD matches.", "Catalogue reference speed and limiting speed are different limits: the 700 r/min reference is a thermal criterion under load, while the 950 r/min limiting value is the mechanical ceiling — observe both.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 4607/6700 kN ratings are SKF catalogue values for this exact execution (23264 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23264 (cylindrical bore as listed, tapered-bore 23264 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23264 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23264?", "a": "The 23264 CC/W33 is a double-row spherical roller bearing with 320 mm bore, 580 mm outer diameter and 208 mm width (12.598 × 22.835 × 8.189 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 4607 kN, C0 6700 kN, fatigue load limit Pu 475 kN, reference speed 700 r/min, limiting speed 950 r/min, mass about 240000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23264 bore code work?", "a": "The last two digits of 23264 are bore code 64, so 64 × 5 = 320 mm bore. The 580 mm OD and 208 mm width come from the ISO 15 dimension-series plan (dimension series 32 (medium OD, extra wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23264?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23264 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23264K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23264 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23264", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23264-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on OH3264 adapter sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23264", "23264 CC/W33" ], "locale_variants": {} }, { "sku": "23268", "brand": "SKF", "manufacturer_designation": "SKF 23268 CA/W33", "series": "23200-series", "type": "spherical_roller", "d_mm": 340, "D_mm": 620, "B_mm": 224, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass_machined_M1", "dynamic_load_kN": 5362, "static_load_kN": 7800, "fatigue_load_limit_kN": 550, "max_rpm": 800, "reference_speed_rpm": 560, "limiting_speed_rpm": 800, "weight_g": 295000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF 23268 (23268 CA/W33) is the spherical-roller choice for a 340 mm shaft — barrel rollers between an inner ring with two raceways and a common sphered outer raceway inside the 620×224 mm ISO 15 envelope. Digit by digit, 23268 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 32, and bore reference 68 resolving to 340 mm; 620 mm OD and 224 mm width are the matching ISO 15 boundary values. In SKF suffix language, CA/W33 means the brass-cage CA execution — often preferred for the largest bores and for shock/vibration duty where a rigid machined cage matters; W33 adds the relubrication groove. The sealed 2CS5 and vibrating-screen VA405 are separate executions. The 140.0 mm radial section height ((620−340)/2) and 295000 g catalogue mass frame a 340 mm bore bearing rated at 5362 kN C — roughly 15.77 kN of dynamic capacity per millimetre of bore before application factors. A 340 mm rotating inner ring usually runs m6 on the shaft with H7 in the housing; for vibrating-screen duty the outer ring is instead held tight and the shaft seat loosened — follow the screen builder's fit schedule.", "applications": [ "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "steel-plant continuous-caster segments" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "smearing on the roller-raceway contact during skid starts below the minimum load" ], "pitfalls": [ "At 340 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23200-series series at 340 mm bore (620×224 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 224 mm width changes abutment spacing, even though the 620 mm OD matches.", "The 295000 g mass and 224 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23268.", "Shaft and housing fillets must clear the bearing chamfer so the 224 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 5362/7800 kN ratings are SKF catalogue values for this exact execution (23268 CA/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23268 (cylindrical bore as listed, tapered-bore 23268 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23268 CA/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23268?", "a": "The 23268 CA/W33 is a double-row spherical roller bearing with 340 mm bore, 620 mm outer diameter and 224 mm width (13.386 × 24.409 × 8.819 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 5362 kN, C0 7800 kN, fatigue load limit Pu 550 kN, reference speed 560 r/min, limiting speed 800 r/min, mass about 295000 g. It is an open, self-aligning bearing with a one-piece machined brass cage guided on the inner ring (CA design)." }, { "q": "How does the 23268 bore code work?", "a": "The last two digits of 23268 are bore code 68, so 68 × 5 = 340 mm bore. The 620 mm OD and 224 mm width come from the ISO 15 dimension-series plan (dimension series 32 (medium OD, extra wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CA/W33 suffix mean on 23268?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23268 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23268K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23268 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23268", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23268-CAK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on OH3268 adapter sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23268", "23268 CA/W33" ], "locale_variants": {} }, { "sku": "23272", "brand": "SKF", "manufacturer_designation": "SKF 23272 CA/W33", "series": "23200-series", "type": "spherical_roller", "d_mm": 360, "D_mm": 650, "B_mm": 232, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass_machined_M1", "dynamic_load_kN": 5663, "static_load_kN": 8300, "fatigue_load_limit_kN": 570, "max_rpm": 750, "reference_speed_rpm": 530, "limiting_speed_rpm": 750, "weight_g": 335000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 23272 appears as 23272 CA/W33: an open, double-row spherical roller bearing, self-aligning by virtue of the sphered outer raceway, sized 360×650×232 mm to the ISO 15 boundary plan. Numbering ties the bearing to its envelope: 23272 means spherical-roller type, dimension series 32, 360 mm bore — which is why the 650×232 mm outline swaps dimensionally with other ISO 15 bearings of the same code. In SKF suffix language, CA/W33 means the brass-cage CA execution — often preferred for the largest bores and for shock/vibration duty where a rigid machined cage matters; W33 adds the relubrication groove. The sealed 2CS5 and vibrating-screen VA405 are separate executions. The 570 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.47 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. A 360 mm rotating inner ring usually runs m6 on the shaft with H7 in the housing; for vibrating-screen duty the outer ring is instead held tight and the shaft seat loosened — follow the screen builder's fit schedule.", "applications": [ "steel-plant continuous-caster segments", "large induced-draft fan rotors", "SAG and ball-mill drive shafts", "large mining crusher main shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "At 360 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23200-series series at 360 mm bore (650×232 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 232 mm width changes abutment spacing, even though the 650 mm OD matches.", "Catalogue reference speed and limiting speed are different limits: the 530 r/min reference is a thermal criterion under load, while the 750 r/min limiting value is the mechanical ceiling — observe both.", "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23272; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 5663/8300 kN ratings are SKF catalogue values for this exact execution (23272 CA/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23272 (cylindrical bore as listed, tapered-bore 23272 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23272 CA/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23272?", "a": "The 23272 CA/W33 is a double-row spherical roller bearing with 360 mm bore, 650 mm outer diameter and 232 mm width (14.173 × 25.591 × 9.134 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 5663 kN, C0 8300 kN, fatigue load limit Pu 570 kN, reference speed 530 r/min, limiting speed 750 r/min, mass about 335000 g. It is an open, self-aligning bearing with a one-piece machined brass cage guided on the inner ring (CA design)." }, { "q": "How does the 23272 bore code work?", "a": "The last two digits of 23272 are bore code 72, so 72 × 5 = 360 mm bore. The 650 mm OD and 232 mm width come from the ISO 15 dimension-series plan (dimension series 32 (medium OD, extra wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CA/W33 suffix mean on 23272?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23272 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23272K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23272 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23272", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23272-CAK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on OH3272 adapter sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23272", "23272 CA/W33" ], "locale_variants": {} }, { "sku": "23276", "brand": "SKF", "manufacturer_designation": "SKF 23276 CA/W33", "series": "23200-series", "type": "spherical_roller", "d_mm": 380, "D_mm": 680, "B_mm": 240, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass_machined_M1", "dynamic_load_kN": 6126, "static_load_kN": 9150, "fatigue_load_limit_kN": 620, "max_rpm": 750, "reference_speed_rpm": 500, "limiting_speed_rpm": 750, "weight_g": 375000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number 23276 CA/W33 in SKF catalogue PUB BU/P1 17000 denotes a double-row spherical roller bearing for a 380 mm shaft, dimension series 32 (medium OD, extra wide), with open execution and a one-piece machined brass cage guided on the inner ring (CA design). Digit by digit, 23276 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 32, and bore reference 76 resolving to 380 mm; 680 mm OD and 240 mm width are the matching ISO 15 boundary values. In SKF suffix language, CA/W33 means the brass-cage CA execution — often preferred for the largest bores and for shock/vibration duty where a rigid machined cage matters; W33 adds the relubrication groove. The sealed 2CS5 and vibrating-screen VA405 are separate executions. At 500 r/min reference speed the 150.0 mm-section 23276 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 750 r/min as the mechanical ceiling. For relubrication, route the grease duct to the outer-ring W33 groove position where fitted, and purge until fresh grease appears at the seal — the 240 mm width across two roller rows needs the full charge.", "applications": [ "large induced-draft fan rotors", "SAG and ball-mill drive shafts", "large mining crusher main shafts", "wind-turbine main shaft support" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "At 380 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23200-series series at 380 mm bore (680×240 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 240 mm width changes abutment spacing, even though the 680 mm OD matches.", "The 375000 g mass and 240 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23276.", "The 23276 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 6126/9150 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The 6126/9150 kN ratings are SKF catalogue values for this exact execution (23276 CA/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23276 (cylindrical bore as listed, tapered-bore 23276 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23276 CA/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23276?", "a": "The 23276 CA/W33 is a double-row spherical roller bearing with 380 mm bore, 680 mm outer diameter and 240 mm width (14.961 × 26.772 × 9.449 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 6126 kN, C0 9150 kN, fatigue load limit Pu 620 kN, reference speed 500 r/min, limiting speed 750 r/min, mass about 375000 g. It is an open, self-aligning bearing with a one-piece machined brass cage guided on the inner ring (CA design)." }, { "q": "How does the 23276 bore code work?", "a": "The last two digits of 23276 are bore code 76, so 76 × 5 = 380 mm bore. The 680 mm OD and 240 mm width come from the ISO 15 dimension-series plan (dimension series 32 (medium OD, extra wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CA/W33 suffix mean on 23276?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23276 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23276K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23276 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23276", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23276-CAK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on OH3276 adapter sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23276", "23276 CA/W33" ], "locale_variants": {} }, { "sku": "23280", "brand": "SKF", "manufacturer_designation": "SKF 23280 CA/W33", "series": "23200-series", "type": "spherical_roller", "d_mm": 400, "D_mm": 720, "B_mm": 256, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass_machined_M1", "dynamic_load_kN": 6881, "static_load_kN": 10400, "fatigue_load_limit_kN": 680, "max_rpm": 670, "reference_speed_rpm": 480, "limiting_speed_rpm": 670, "weight_g": 450000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "23280 CA/W33 belongs to the SKF spherical roller range — the 400 mm bore entry in the 23200-series series (dimension series 32 (medium OD, extra wide)), dimensioned 720 mm OD and 256 mm wide. Numbering ties the bearing to its envelope: 23280 means spherical-roller type, dimension series 32, 400 mm bore — which is why the 720×256 mm outline swaps dimensionally with other ISO 15 bearings of the same code. In SKF suffix language, CA/W33 means the brass-cage CA execution — often preferred for the largest bores and for shock/vibration duty where a rigid machined cage matters; W33 adds the relubrication groove. The sealed 2CS5 and vibrating-screen VA405 are separate executions. The 160.0 mm radial section height ((720−400)/2) and 450000 g catalogue mass frame a 400 mm bore bearing rated at 6881 kN C — roughly 17.20 kN of dynamic capacity per millimetre of bore before application factors. For relubrication, route the grease duct to the outer-ring W33 groove position where fitted, and purge until fresh grease appears at the seal — the 256 mm width across two roller rows needs the full charge.", "applications": [ "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "steel-plant continuous-caster segments" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "At 400 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23200-series series at 400 mm bore (720×256 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 256 mm width changes abutment spacing, even though the 720 mm OD matches.", "Catalogue reference speed and limiting speed are different limits: the 480 r/min reference is a thermal criterion under load, while the 670 r/min limiting value is the mechanical ceiling — observe both.", "The 450000 g mass and 256 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23280.", "The 6881/10400 kN ratings are SKF catalogue values for this exact execution (23280 CA/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23280 (cylindrical bore as listed, tapered-bore 23280 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23280 CA/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23280?", "a": "The 23280 CA/W33 is a double-row spherical roller bearing with 400 mm bore, 720 mm outer diameter and 256 mm width (15.748 × 28.346 × 10.079 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 6881 kN, C0 10400 kN, fatigue load limit Pu 680 kN, reference speed 480 r/min, limiting speed 670 r/min, mass about 450000 g. It is an open, self-aligning bearing with a one-piece machined brass cage guided on the inner ring (CA design)." }, { "q": "How does the 23280 bore code work?", "a": "The last two digits of 23280 are bore code 80, so 80 × 5 = 400 mm bore. The 720 mm OD and 256 mm width come from the ISO 15 dimension-series plan (dimension series 32 (medium OD, extra wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CA/W33 suffix mean on 23280?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23280 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23280K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23280 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23280", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23280-CAK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on OH3280 adapter sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23280", "23280 CA/W33" ], "locale_variants": {} }, { "sku": "23284", "brand": "SKF", "manufacturer_designation": "SKF 23284 CA/W33", "series": "23200-series", "type": "spherical_roller", "d_mm": 420, "D_mm": 760, "B_mm": 272, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass_machined_M1", "dynamic_load_kN": 7677, "static_load_kN": 11600, "fatigue_load_limit_kN": 765, "max_rpm": 630, "reference_speed_rpm": 450, "limiting_speed_rpm": 630, "weight_g": 535000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "23284 is a double-row spherical roller bearing in the 23200-series family: two rows of barrel rollers on a common sphered outer raceway, self-aligning under shaft deflection, listed by SKF in SKF catalogue PUB BU/P1 17000. Digit by digit, 23284 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 32, and bore reference 84 resolving to 420 mm; 760 mm OD and 272 mm width are the matching ISO 15 boundary values. In SKF suffix language, CA/W33 means the brass-cage CA execution — often preferred for the largest bores and for shock/vibration duty where a rigid machined cage matters; W33 adds the relubrication groove. The sealed 2CS5 and vibrating-screen VA405 are separate executions. With C 7677 kN and C0 11600 kN, the 23284 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. After mounting, swing the outer ring to confirm free self-alignment: the 23284 should tilt through its full catalogue misalignment range without binding; a stiff joint signals a cocked seat or shoulder interference.", "applications": [ "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "steel-plant continuous-caster segments", "large induced-draft fan rotors" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "At 420 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23200-series series at 420 mm bore (760×272 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 272 mm width changes abutment spacing, even though the 760 mm OD matches.", "The 535000 g mass and 272 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23284.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23284 pits long before its L10 life.", "The 7677/11600 kN ratings are SKF catalogue values for this exact execution (23284 CA/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23284 (cylindrical bore as listed, tapered-bore 23284 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23284 CA/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23284?", "a": "The 23284 CA/W33 is a double-row spherical roller bearing with 420 mm bore, 760 mm outer diameter and 272 mm width (16.535 × 29.921 × 10.709 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 7677 kN, C0 11600 kN, fatigue load limit Pu 765 kN, reference speed 450 r/min, limiting speed 630 r/min, mass about 535000 g. It is an open, self-aligning bearing with a one-piece machined brass cage guided on the inner ring (CA design)." }, { "q": "How does the 23284 bore code work?", "a": "The last two digits of 23284 are bore code 84, so 84 × 5 = 420 mm bore. The 760 mm OD and 272 mm width come from the ISO 15 dimension-series plan (dimension series 32 (medium OD, extra wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CA/W33 suffix mean on 23284?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23284 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23284K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23284 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23284", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23284-CAK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on OH3284 adapter sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23284", "23284 CA/W33" ], "locale_variants": {} }, { "sku": "23288", "brand": "SKF", "manufacturer_designation": "SKF 23288 CA/W33", "series": "23200-series", "type": "spherical_roller", "d_mm": 440, "D_mm": 790, "B_mm": 280, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass_machined_M1", "dynamic_load_kN": 8150, "static_load_kN": 12500, "fatigue_load_limit_kN": 800, "max_rpm": 600, "reference_speed_rpm": 430, "limiting_speed_rpm": 600, "weight_g": 590000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 440 mm shaft carrying heavy radial load with misalignment or deflection, SKF lists 23288 under catalogue execution 23288 CA/W33: two barrel-roller rows on a sphered outer raceway. Reading the designation: the leading 2 marks a spherical roller bearing, the 32 is the ISO 15 dimension series (dimension series 32 (medium OD, extra wide)), and the last two digits encode the 440 mm bore; the 790 mm OD and 280 mm width follow the ISO 15 general plan. In SKF suffix language, CA/W33 means the brass-cage CA execution — often preferred for the largest bores and for shock/vibration duty where a rigid machined cage matters; W33 adds the relubrication groove. The sealed 2CS5 and vibrating-screen VA405 are separate executions. Catalogue mass 590000 g for the 440×790×280 mm open execution covers the a one-piece machined brass cage guided on the inner ring (CA design); tapered-bore and sealed variants differ in mass and carry their own order numbers. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.", "applications": [ "large dredger and marine winch drums", "steel-plant continuous-caster segments", "large induced-draft fan rotors", "SAG and ball-mill drive shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "At 440 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23200-series series at 440 mm bore (790×280 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 280 mm width changes abutment spacing, even though the 790 mm OD matches.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23288 pits long before its L10 life.", "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23288; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 8150/12500 kN ratings are SKF catalogue values for this exact execution (23288 CA/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23288 (cylindrical bore as listed, tapered-bore 23288 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23288 CA/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23288?", "a": "The 23288 CA/W33 is a double-row spherical roller bearing with 440 mm bore, 790 mm outer diameter and 280 mm width (17.323 × 31.102 × 11.024 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 8150 kN, C0 12500 kN, fatigue load limit Pu 800 kN, reference speed 430 r/min, limiting speed 600 r/min, mass about 590000 g. It is an open, self-aligning bearing with a one-piece machined brass cage guided on the inner ring (CA design)." }, { "q": "How does the 23288 bore code work?", "a": "The last two digits of 23288 are bore code 88, so 88 × 5 = 440 mm bore. The 790 mm OD and 280 mm width come from the ISO 15 dimension-series plan (dimension series 32 (medium OD, extra wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CA/W33 suffix mean on 23288?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23288 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23288K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23288 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23288", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23288-CAK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on OH3288 adapter sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23288", "23288 CA/W33" ], "locale_variants": {} }, { "sku": "23292", "brand": "SKF", "manufacturer_designation": "SKF 23292 CA/W33", "series": "23200-series", "type": "spherical_roller", "d_mm": 460, "D_mm": 830, "B_mm": 296, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass_machined_M1", "dynamic_load_kN": 8958, "static_load_kN": 13700, "fatigue_load_limit_kN": 880, "max_rpm": 560, "reference_speed_rpm": 400, "limiting_speed_rpm": 560, "weight_g": 695000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 23292 CA/W33 is a 460×830×296 mm spherical roller bearing — the dimension series 32 (medium OD, extra wide) entry for a 460 mm shaft, with two rows of symmetrical barrel rollers for combined radial and axial load. Digit by digit, 23292 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 32, and bore reference 92 resolving to 460 mm; 830 mm OD and 296 mm width are the matching ISO 15 boundary values. In SKF suffix language, CA/W33 means the brass-cage CA execution — often preferred for the largest bores and for shock/vibration duty where a rigid machined cage matters; W33 adds the relubrication groove. The sealed 2CS5 and vibrating-screen VA405 are separate executions. Selection arithmetic: the C0/C ratio is about 1.53 (static 13700 kN against dynamic 8958 kN), typical of a spherical roller sized for heavy combined loads, and the 880 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.", "applications": [ "SAG and ball-mill drive shafts", "large mining crusher main shafts", "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals" ], "pitfalls": [ "At 460 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23200-series series at 460 mm bore (830×296 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 296 mm width changes abutment spacing, even though the 830 mm OD matches.", "The 695000 g mass and 296 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23292.", "Catalogue reference speed and limiting speed are different limits: the 400 r/min reference is a thermal criterion under load, while the 560 r/min limiting value is the mechanical ceiling — observe both.", "The 8958/13700 kN ratings are SKF catalogue values for this exact execution (23292 CA/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23292 (cylindrical bore as listed, tapered-bore 23292 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23292 CA/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23292?", "a": "The 23292 CA/W33 is a double-row spherical roller bearing with 460 mm bore, 830 mm outer diameter and 296 mm width (18.11 × 32.677 × 11.654 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 8958 kN, C0 13700 kN, fatigue load limit Pu 880 kN, reference speed 400 r/min, limiting speed 560 r/min, mass about 695000 g. It is an open, self-aligning bearing with a one-piece machined brass cage guided on the inner ring (CA design)." }, { "q": "How does the 23292 bore code work?", "a": "The last two digits of 23292 are bore code 92, so 92 × 5 = 460 mm bore. The 830 mm OD and 296 mm width come from the ISO 15 dimension-series plan (dimension series 32 (medium OD, extra wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CA/W33 suffix mean on 23292?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23292 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23292K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23292 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23292", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23292-CAK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on AOHX3292 withdrawal sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C3292-MB", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3292 MB shares the 460×830×296 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C3292-KMB", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3292 KMB shares the 460×830×296 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23292", "23292 CA/W33" ], "locale_variants": {} }, { "sku": "23296", "brand": "SKF", "manufacturer_designation": "SKF 23296 CA/W33", "series": "23200-series", "type": "spherical_roller", "d_mm": 480, "D_mm": 870, "B_mm": 310, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass_machined_M1", "dynamic_load_kN": 9805, "static_load_kN": 15000, "fatigue_load_limit_kN": 950, "max_rpm": 530, "reference_speed_rpm": 380, "limiting_speed_rpm": 530, "weight_g": 800000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF 23296 (23296 CA/W33) is the spherical-roller choice for a 480 mm shaft — barrel rollers between an inner ring with two raceways and a common sphered outer raceway inside the 870×310 mm ISO 15 envelope. Reading the designation: the leading 2 marks a spherical roller bearing, the 32 is the ISO 15 dimension series (dimension series 32 (medium OD, extra wide)), and the last two digits encode the 480 mm bore; the 870 mm OD and 310 mm width follow the ISO 15 general plan. In SKF suffix language, CA/W33 means the brass-cage CA execution — often preferred for the largest bores and for shock/vibration duty where a rigid machined cage matters; W33 adds the relubrication groove. The sealed 2CS5 and vibrating-screen VA405 are separate executions. Speed planning uses two different ceilings: 380 r/min thermal reference and 530 r/min mechanical limiting speed. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 23296 CCK/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.", "applications": [ "large mining crusher main shafts", "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals" ], "pitfalls": [ "At 480 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23200-series series at 480 mm bore (870×310 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 310 mm width changes abutment spacing, even though the 870 mm OD matches.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23296 pits long before its L10 life.", "The 800000 g mass and 310 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23296.", "The 9805/15000 kN ratings are SKF catalogue values for this exact execution (23296 CA/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23296 (cylindrical bore as listed, tapered-bore 23296 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23296 CA/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23296?", "a": "The 23296 CA/W33 is a double-row spherical roller bearing with 480 mm bore, 870 mm outer diameter and 310 mm width (18.898 × 34.252 × 12.205 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 9805 kN, C0 15000 kN, fatigue load limit Pu 950 kN, reference speed 380 r/min, limiting speed 530 r/min, mass about 800000 g. It is an open, self-aligning bearing with a one-piece machined brass cage guided on the inner ring (CA design)." }, { "q": "How does the 23296 bore code work?", "a": "The last two digits of 23296 are bore code 96, so 96 × 5 = 480 mm bore. The 870 mm OD and 310 mm width come from the ISO 15 dimension-series plan (dimension series 32 (medium OD, extra wide)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CA/W33 suffix mean on 23296?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23296 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23296K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23296 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23296", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23296-CAK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on AOHX3296 withdrawal sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23296", "23296 CA/W33" ], "locale_variants": {} }, { "sku": "23936", "brand": "SKF", "manufacturer_designation": "SKF 23936 CC/W33", "series": "23900-series", "type": "spherical_roller", "d_mm": 180, "D_mm": 250, "B_mm": 52, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 519, "static_load_kN": 830, "fatigue_load_limit_kN": 76.5, "max_rpm": 2800, "reference_speed_rpm": 2600, "limiting_speed_rpm": 2800, "weight_g": 7900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "23936 CC/W33 belongs to the SKF spherical roller range — the 180 mm bore entry in the 23900-series series (dimension series 39 (compact OD, narrow)), dimensioned 250 mm OD and 52 mm wide. The code breaks down as type digit 2 (double-row spherical roller), dimension series 39 (dimension series 39 (compact OD, narrow)), and bore code 36 = 180 mm; dimensions 180×250×52 mm therefore match the ISO 15 envelope. The suffix chain reads CC (two pressed-steel cages with a floating guide ring between the roller rows) plus W33 (annular groove and three lubrication holes in the outer ring for relubrication); CCK/W33 is the 1:12 tapered-bore counterpart. The 76.5 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.60 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. For relubrication, route the grease duct to the outer-ring W33 groove position where fitted, and purge until fresh grease appears at the seal — the 52 mm width across two roller rows needs the full charge.", "applications": [ "steel-plant continuous-caster segments", "large induced-draft fan rotors", "SAG and ball-mill drive shafts", "large mining crusher main shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "At 180 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23900-series series at 180 mm bore (250×52 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "The 7900 g mass and 52 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23936.", "The 7900 g mass and 52 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23936.", "The 519/830 kN ratings are SKF catalogue values for this exact execution (23936 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23936 (cylindrical bore as listed, tapered-bore 23936 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23936 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23936?", "a": "The 23936 CC/W33 is a double-row spherical roller bearing with 180 mm bore, 250 mm outer diameter and 52 mm width (7.087 × 9.843 × 2.047 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 519 kN, C0 830 kN, fatigue load limit Pu 76.5 kN, reference speed 2,600 r/min, limiting speed 2,800 r/min, mass about 7900 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23936 bore code work?", "a": "The last two digits of 23936 are bore code 36, so 36 × 5 = 180 mm bore. The 250 mm OD and 52 mm width come from the ISO 15 dimension-series plan (dimension series 39 (compact OD, narrow)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23936?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23936 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23936K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23936 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23936", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23936-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H3936 adapter sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23936", "23936 CC/W33" ], "locale_variants": {} }, { "sku": "23938", "brand": "SKF", "manufacturer_designation": "SKF 23938 CC/W33", "series": "23900-series", "type": "spherical_roller", "d_mm": 190, "D_mm": 260, "B_mm": 52, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 499, "static_load_kN": 800, "fatigue_load_limit_kN": 76.5, "max_rpm": 2600, "reference_speed_rpm": 2400, "limiting_speed_rpm": 2600, "weight_g": 8300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF 23938 (23938 CC/W33) is the spherical-roller choice for a 190 mm shaft — barrel rollers between an inner ring with two raceways and a common sphered outer raceway inside the 260×52 mm ISO 15 envelope. Digit by digit, 23938 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 39, and bore reference 38 resolving to 190 mm; 260 mm OD and 52 mm width are the matching ISO 15 boundary values. The suffix chain reads CC (two pressed-steel cages with a floating guide ring between the roller rows) plus W33 (annular groove and three lubrication holes in the outer ring for relubrication); CCK/W33 is the 1:12 tapered-bore counterpart. The 35.0 mm radial section height ((260−190)/2) and 8300 g catalogue mass frame a 190 mm bore bearing rated at 499 kN C — roughly 2.63 kN of dynamic capacity per millimetre of bore before application factors. Drive-on force must go through the ring being fitted: press or induction-heat the inner ring onto the 190 mm shaft (max 120 °C) and never transmit mounting force through the roller complement, or the raceways brinell.", "applications": [ "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "steel-plant continuous-caster segments" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "smearing on the roller-raceway contact during skid starts below the minimum load" ], "pitfalls": [ "At 190 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23900-series series at 190 mm bore (260×52 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 499/800 kN ratings are SKF catalogue values for this exact execution (23938 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23938 (cylindrical bore as listed, tapered-bore 23938 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23938 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23938?", "a": "The 23938 CC/W33 is a double-row spherical roller bearing with 190 mm bore, 260 mm outer diameter and 52 mm width (7.48 × 10.236 × 2.047 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 499 kN, C0 800 kN, fatigue load limit Pu 76.5 kN, reference speed 2,400 r/min, limiting speed 2,600 r/min, mass about 8300 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23938 bore code work?", "a": "The last two digits of 23938 are bore code 38, so 38 × 5 = 190 mm bore. The 260 mm OD and 52 mm width come from the ISO 15 dimension-series plan (dimension series 39 (compact OD, narrow)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23938?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23938 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23938K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23938 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23938", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23938-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H3938 adapter sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23938", "23938 CC/W33" ], "locale_variants": {} }, { "sku": "23940", "brand": "SKF", "manufacturer_designation": "SKF 23940 CC/W33", "series": "23900-series", "type": "spherical_roller", "d_mm": 200, "D_mm": 280, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 651, "static_load_kN": 1040, "fatigue_load_limit_kN": 93, "max_rpm": 2400, "reference_speed_rpm": 2200, "limiting_speed_rpm": 2400, "weight_g": 11500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "23940 is a double-row spherical roller bearing in the 23900-series family: two rows of barrel rollers on a common sphered outer raceway, self-aligning under shaft deflection, listed by SKF in SKF catalogue PUB BU/P1 17000. Reading the designation: the leading 2 marks a spherical roller bearing, the 39 is the ISO 15 dimension series (dimension series 39 (compact OD, narrow)), and the last two digits encode the 200 mm bore; the 280 mm OD and 60 mm width follow the ISO 15 general plan. The suffix chain reads CC (two pressed-steel cages with a floating guide ring between the roller rows) plus W33 (annular groove and three lubrication holes in the outer ring for relubrication); CCK/W33 is the 1:12 tapered-bore counterpart. Speed planning uses two different ceilings: 2,200 r/min thermal reference and 2,400 r/min mechanical limiting speed. For relubrication, route the grease duct to the outer-ring W33 groove position where fitted, and purge until fresh grease appears at the seal — the 60 mm width across two roller rows needs the full charge.", "applications": [ "large mining crusher main shafts", "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals" ], "pitfalls": [ "At 200 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23900-series series at 200 mm bore (280×60 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "Catalogue reference speed and limiting speed are different limits: the 2,200 r/min reference is a thermal criterion under load, while the 2,400 r/min limiting value is the mechanical ceiling — observe both.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 651/1040 kN ratings are SKF catalogue values for this exact execution (23940 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23940 (cylindrical bore as listed, tapered-bore 23940 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23940 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23940?", "a": "The 23940 CC/W33 is a double-row spherical roller bearing with 200 mm bore, 280 mm outer diameter and 60 mm width (7.874 × 11.024 × 2.362 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 651 kN, C0 1040 kN, fatigue load limit Pu 93 kN, reference speed 2,200 r/min, limiting speed 2,400 r/min, mass about 11500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23940 bore code work?", "a": "The last two digits of 23940 are bore code 40, so 40 × 5 = 200 mm bore. The 280 mm OD and 60 mm width come from the ISO 15 dimension-series plan (dimension series 39 (compact OD, narrow)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23940?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23940 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23940K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23940 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23940", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23940-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on H3940 adapter sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23940", "23940 CC/W33" ], "locale_variants": {} }, { "sku": "23944", "brand": "SKF", "manufacturer_designation": "SKF 23944 CC/W33", "series": "23900-series", "type": "spherical_roller", "d_mm": 220, "D_mm": 300, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 661, "static_load_kN": 1080, "fatigue_load_limit_kN": 93, "max_rpm": 2200, "reference_speed_rpm": 2000, "limiting_speed_rpm": 2200, "weight_g": 12500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 220 mm shaft carrying heavy radial load with misalignment or deflection, SKF lists 23944 under catalogue execution 23944 CC/W33: two barrel-roller rows on a sphered outer raceway. The code breaks down as type digit 2 (double-row spherical roller), dimension series 39 (dimension series 39 (compact OD, narrow)), and bore code 44 = 220 mm; dimensions 220×300×60 mm therefore match the ISO 15 envelope. The suffix chain reads CC (two pressed-steel cages with a floating guide ring between the roller rows) plus W33 (annular groove and three lubrication holes in the outer ring for relubrication); CCK/W33 is the 1:12 tapered-bore counterpart. The 40.0 mm radial section height ((300−220)/2) and 12500 g catalogue mass frame a 220 mm bore bearing rated at 661 kN C — roughly 3.00 kN of dynamic capacity per millimetre of bore before application factors. After mounting, swing the outer ring to confirm free self-alignment: the 23944 should tilt through its full catalogue misalignment range without binding; a stiff joint signals a cocked seat or shoulder interference.", "applications": [ "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "steel-plant continuous-caster segments" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals" ], "pitfalls": [ "At 220 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23900-series series at 220 mm bore (300×60 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "The 12500 g mass and 60 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23944.", "Shaft and housing fillets must clear the bearing chamfer so the 60 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 661/1080 kN ratings are SKF catalogue values for this exact execution (23944 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23944 (cylindrical bore as listed, tapered-bore 23944 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23944 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23944?", "a": "The 23944 CC/W33 is a double-row spherical roller bearing with 220 mm bore, 300 mm outer diameter and 60 mm width (8.661 × 11.811 × 2.362 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 661 kN, C0 1080 kN, fatigue load limit Pu 93 kN, reference speed 2,000 r/min, limiting speed 2,200 r/min, mass about 12500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23944 bore code work?", "a": "The last two digits of 23944 are bore code 44, so 44 × 5 = 220 mm bore. The 300 mm OD and 60 mm width come from the ISO 15 dimension-series plan (dimension series 39 (compact OD, narrow)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23944?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23944 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23944K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23944 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23944", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23944-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on OH3944 adapter sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23944", "23944 CC/W33" ], "locale_variants": {} }, { "sku": "23948", "brand": "SKF", "manufacturer_designation": "SKF 23948 CC/W33", "series": "23900-series", "type": "spherical_roller", "d_mm": 240, "D_mm": 320, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 685, "static_load_kN": 1160, "fatigue_load_limit_kN": 98, "max_rpm": 2000, "reference_speed_rpm": 1900, "limiting_speed_rpm": 2000, "weight_g": 13500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 23948 CC/W33 is a 240×320×60 mm spherical roller bearing — the dimension series 39 (compact OD, narrow) entry for a 240 mm shaft, with two rows of symmetrical barrel rollers for combined radial and axial load. On the SKF nameplate, 23948 follows the ISO 15 convention: 2 for the spherical roller type, 39 for the dimension series 39 (compact OD, narrow), final digits 48 for the 240 mm bore. The suffix chain reads CC (two pressed-steel cages with a floating guide ring between the roller rows) plus W33 (annular groove and three lubrication holes in the outer ring for relubrication); CCK/W33 is the 1:12 tapered-bore counterpart. With C 685 kN and C0 1160 kN, the 23948 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.", "applications": [ "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "steel-plant continuous-caster segments", "large induced-draft fan rotors" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals" ], "pitfalls": [ "At 240 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23900-series series at 240 mm bore (320×60 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23948 pits long before its L10 life.", "Catalogue reference speed and limiting speed are different limits: the 1,900 r/min reference is a thermal criterion under load, while the 2,000 r/min limiting value is the mechanical ceiling — observe both.", "The 685/1160 kN ratings are SKF catalogue values for this exact execution (23948 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23948 (cylindrical bore as listed, tapered-bore 23948 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23948 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23948?", "a": "The 23948 CC/W33 is a double-row spherical roller bearing with 240 mm bore, 320 mm outer diameter and 60 mm width (9.449 × 12.598 × 2.362 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 685 kN, C0 1160 kN, fatigue load limit Pu 98 kN, reference speed 1,900 r/min, limiting speed 2,000 r/min, mass about 13500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23948 bore code work?", "a": "The last two digits of 23948 are bore code 48, so 48 × 5 = 240 mm bore. The 320 mm OD and 60 mm width come from the ISO 15 dimension-series plan (dimension series 39 (compact OD, narrow)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23948?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23948 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23948K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23948 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23948", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23948-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on OH3948 adapter sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23948", "23948 CC/W33" ], "locale_variants": {} }, { "sku": "23952", "brand": "SKF", "manufacturer_designation": "SKF 23952 CC/W33", "series": "23900-series", "type": "spherical_roller", "d_mm": 260, "D_mm": 360, "B_mm": 75, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1055, "static_load_kN": 1800, "fatigue_load_limit_kN": 156, "max_rpm": 1900, "reference_speed_rpm": 1700, "limiting_speed_rpm": 1900, "weight_g": 23500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF 23952 (23952 CC/W33) is the spherical-roller choice for a 260 mm shaft — barrel rollers between an inner ring with two raceways and a common sphered outer raceway inside the 360×75 mm ISO 15 envelope. The code breaks down as type digit 2 (double-row spherical roller), dimension series 39 (dimension series 39 (compact OD, narrow)), and bore code 52 = 260 mm; dimensions 260×360×75 mm therefore match the ISO 15 envelope. The suffix chain reads CC (two pressed-steel cages with a floating guide ring between the roller rows) plus W33 (annular groove and three lubrication holes in the outer ring for relubrication); CCK/W33 is the 1:12 tapered-bore counterpart. At 1,700 r/min reference speed the 50.0 mm-section 23952 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 1,900 r/min as the mechanical ceiling. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.", "applications": [ "large induced-draft fan rotors", "SAG and ball-mill drive shafts", "large mining crusher main shafts", "wind-turbine main shaft support" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "smearing on the roller-raceway contact during skid starts below the minimum load" ], "pitfalls": [ "At 260 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23900-series series at 260 mm bore (360×75 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "The 23500 g mass and 75 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23952.", "The 23952 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 1055/1800 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The 1055/1800 kN ratings are SKF catalogue values for this exact execution (23952 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23952 (cylindrical bore as listed, tapered-bore 23952 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23952 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23952?", "a": "The 23952 CC/W33 is a double-row spherical roller bearing with 260 mm bore, 360 mm outer diameter and 75 mm width (10.236 × 14.173 × 2.953 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1055 kN, C0 1800 kN, fatigue load limit Pu 156 kN, reference speed 1,700 r/min, limiting speed 1,900 r/min, mass about 23500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23952 bore code work?", "a": "The last two digits of 23952 are bore code 52, so 52 × 5 = 260 mm bore. The 360 mm OD and 75 mm width come from the ISO 15 dimension-series plan (dimension series 39 (compact OD, narrow)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23952?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23952 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23952K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23952 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23952", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23952-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on OH3952 adapter sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23952", "23952 CC/W33" ], "locale_variants": {} }, { "sku": "23956", "brand": "SKF", "manufacturer_designation": "SKF 23956 CC/W33", "series": "23900-series", "type": "spherical_roller", "d_mm": 280, "D_mm": 380, "B_mm": 75, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1016, "static_load_kN": 1760, "fatigue_load_limit_kN": 143, "max_rpm": 1700, "reference_speed_rpm": 1600, "limiting_speed_rpm": 1700, "weight_g": 25000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 23956 appears as 23956 CC/W33: an open, double-row spherical roller bearing, self-aligning by virtue of the sphered outer raceway, sized 280×380×75 mm to the ISO 15 boundary plan. Digit by digit, 23956 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 39, and bore reference 56 resolving to 280 mm; 380 mm OD and 75 mm width are the matching ISO 15 boundary values. The suffix chain reads CC (two pressed-steel cages with a floating guide ring between the roller rows) plus W33 (annular groove and three lubrication holes in the outer ring for relubrication); CCK/W33 is the 1:12 tapered-bore counterpart. At 1,600 r/min reference speed the 50.0 mm-section 23956 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 1,700 r/min as the mechanical ceiling. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 23956 CCK/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.", "applications": [ "large induced-draft fan rotors", "SAG and ball-mill drive shafts", "large mining crusher main shafts", "wind-turbine main shaft support" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "smearing on the roller-raceway contact during skid starts below the minimum load" ], "pitfalls": [ "At 280 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23900-series series at 280 mm bore (380×75 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "The 23956 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 1016/1760 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 1016/1760 kN ratings are SKF catalogue values for this exact execution (23956 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23956 (cylindrical bore as listed, tapered-bore 23956 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23956 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23956?", "a": "The 23956 CC/W33 is a double-row spherical roller bearing with 280 mm bore, 380 mm outer diameter and 75 mm width (11.024 × 14.961 × 2.953 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1016 kN, C0 1760 kN, fatigue load limit Pu 143 kN, reference speed 1,600 r/min, limiting speed 1,700 r/min, mass about 25000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23956 bore code work?", "a": "The last two digits of 23956 are bore code 56, so 56 × 5 = 280 mm bore. The 380 mm OD and 75 mm width come from the ISO 15 dimension-series plan (dimension series 39 (compact OD, narrow)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23956?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23956 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23956K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23956 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23956", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23956-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on OH3956 adapter sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23956", "23956 CC/W33" ], "locale_variants": {} }, { "sku": "23960", "brand": "SKF", "manufacturer_designation": "SKF 23960 CC/W33", "series": "23900-series", "type": "spherical_roller", "d_mm": 300, "D_mm": 420, "B_mm": 90, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1413, "static_load_kN": 2500, "fatigue_load_limit_kN": 200, "max_rpm": 1600, "reference_speed_rpm": 1400, "limiting_speed_rpm": 1600, "weight_g": 39500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number 23960 CC/W33 in SKF catalogue PUB BU/P1 17000 denotes a double-row spherical roller bearing for a 300 mm shaft, dimension series 39 (compact OD, narrow), with open execution and two pressed-steel cages with a floating guide ring. Numbering ties the bearing to its envelope: 23960 means spherical-roller type, dimension series 39, 300 mm bore — which is why the 420×90 mm outline swaps dimensionally with other ISO 15 bearings of the same code. The suffix chain reads CC (two pressed-steel cages with a floating guide ring between the roller rows) plus W33 (annular groove and three lubrication holes in the outer ring for relubrication); CCK/W33 is the 1:12 tapered-bore counterpart. The 60.0 mm radial section height ((420−300)/2) and 39500 g catalogue mass frame a 300 mm bore bearing rated at 1413 kN C — roughly 4.71 kN of dynamic capacity per millimetre of bore before application factors. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 23960 CCK/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.", "applications": [ "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "steel-plant continuous-caster segments" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "At 300 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23900-series series at 300 mm bore (420×90 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23960; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23960 pits long before its L10 life.", "The 1413/2500 kN ratings are SKF catalogue values for this exact execution (23960 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23960 (cylindrical bore as listed, tapered-bore 23960 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23960 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23960?", "a": "The 23960 CC/W33 is a double-row spherical roller bearing with 300 mm bore, 420 mm outer diameter and 90 mm width (11.811 × 16.535 × 3.543 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1413 kN, C0 2500 kN, fatigue load limit Pu 200 kN, reference speed 1,400 r/min, limiting speed 1,600 r/min, mass about 39500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23960 bore code work?", "a": "The last two digits of 23960 are bore code 60, so 60 × 5 = 300 mm bore. The 420 mm OD and 90 mm width come from the ISO 15 dimension-series plan (dimension series 39 (compact OD, narrow)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23960?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23960 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23960K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23960 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23960", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23960-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on OH3960 adapter sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23960", "23960 CC/W33" ], "locale_variants": {} }, { "sku": "23964", "brand": "SKF", "manufacturer_designation": "SKF 23964 CC/W33", "series": "23900-series", "type": "spherical_roller", "d_mm": 320, "D_mm": 440, "B_mm": 90, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1480, "static_load_kN": 2700, "fatigue_load_limit_kN": 212, "max_rpm": 1500, "reference_speed_rpm": 1400, "limiting_speed_rpm": 1500, "weight_g": 42000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "23964 CC/W33 belongs to the SKF spherical roller range — the 320 mm bore entry in the 23900-series series (dimension series 39 (compact OD, narrow)), dimensioned 440 mm OD and 90 mm wide. Digit by digit, 23964 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 39, and bore reference 64 resolving to 320 mm; 440 mm OD and 90 mm width are the matching ISO 15 boundary values. The suffix chain reads CC (two pressed-steel cages with a floating guide ring between the roller rows) plus W33 (annular groove and three lubrication holes in the outer ring for relubrication); CCK/W33 is the 1:12 tapered-bore counterpart. With C 1480 kN and C0 2700 kN, the 23964 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. Drive-on force must go through the ring being fitted: press or induction-heat the inner ring onto the 320 mm shaft (max 120 °C) and never transmit mounting force through the roller complement, or the raceways brinell.", "applications": [ "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "steel-plant continuous-caster segments", "large induced-draft fan rotors" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "At 320 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23900-series series at 320 mm bore (440×90 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "The 23964 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 1480/2700 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23964; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 1480/2700 kN ratings are SKF catalogue values for this exact execution (23964 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23964 (cylindrical bore as listed, tapered-bore 23964 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23964 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23964?", "a": "The 23964 CC/W33 is a double-row spherical roller bearing with 320 mm bore, 440 mm outer diameter and 90 mm width (12.598 × 17.323 × 3.543 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1480 kN, C0 2700 kN, fatigue load limit Pu 212 kN, reference speed 1,400 r/min, limiting speed 1,500 r/min, mass about 42000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23964 bore code work?", "a": "The last two digits of 23964 are bore code 64, so 64 × 5 = 320 mm bore. The 440 mm OD and 90 mm width come from the ISO 15 dimension-series plan (dimension series 39 (compact OD, narrow)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23964?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23964 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23964K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23964 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23964", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23964-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on OH3964 adapter sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23964", "23964 CC/W33" ], "locale_variants": {} }, { "sku": "23968", "brand": "SKF", "manufacturer_designation": "SKF 23968 CC/W33", "series": "23900-series", "type": "spherical_roller", "d_mm": 340, "D_mm": 460, "B_mm": 90, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1490, "static_load_kN": 2800, "fatigue_load_limit_kN": 216, "max_rpm": 1400, "reference_speed_rpm": 1300, "limiting_speed_rpm": 1400, "weight_g": 45500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "23968 is a double-row spherical roller bearing in the 23900-series family: two rows of barrel rollers on a common sphered outer raceway, self-aligning under shaft deflection, listed by SKF in SKF catalogue PUB BU/P1 17000. Reading the designation: the leading 2 marks a spherical roller bearing, the 39 is the ISO 15 dimension series (dimension series 39 (compact OD, narrow)), and the last two digits encode the 340 mm bore; the 460 mm OD and 90 mm width follow the ISO 15 general plan. The suffix chain reads CC (two pressed-steel cages with a floating guide ring between the roller rows) plus W33 (annular groove and three lubrication holes in the outer ring for relubrication); CCK/W33 is the 1:12 tapered-bore counterpart. Catalogue mass 45500 g for the 340×460×90 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. Mount with the spherical bearing's self-alignment in mind: it compensates ≈ 0.5–2.5° of misalignment depending on series, but the shaft and housing seats still set the datum — a rotating inner ring on a 340 mm shaft typically takes a m6 seat with an H7 housing bore.", "applications": [ "large dredger and marine winch drums", "steel-plant continuous-caster segments", "large induced-draft fan rotors", "SAG and ball-mill drive shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "At 340 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23900-series series at 340 mm bore (460×90 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 23968 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 1490/2800 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The 1490/2800 kN ratings are SKF catalogue values for this exact execution (23968 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23968 (cylindrical bore as listed, tapered-bore 23968 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23968 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23968?", "a": "The 23968 CC/W33 is a double-row spherical roller bearing with 340 mm bore, 460 mm outer diameter and 90 mm width (13.386 × 18.11 × 3.543 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1490 kN, C0 2800 kN, fatigue load limit Pu 216 kN, reference speed 1,300 r/min, limiting speed 1,400 r/min, mass about 45500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23968 bore code work?", "a": "The last two digits of 23968 are bore code 68, so 68 × 5 = 340 mm bore. The 460 mm OD and 90 mm width come from the ISO 15 dimension-series plan (dimension series 39 (compact OD, narrow)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23968?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23968 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23968K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23968 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23968", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23968-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on OH3968 adapter sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23968", "23968 CC/W33" ], "locale_variants": {} }, { "sku": "23972", "brand": "SKF", "manufacturer_designation": "SKF 23972 CC/W33", "series": "23900-series", "type": "spherical_roller", "d_mm": 360, "D_mm": 480, "B_mm": 90, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1456, "static_load_kN": 2750, "fatigue_load_limit_kN": 220, "max_rpm": 1300, "reference_speed_rpm": 1200, "limiting_speed_rpm": 1300, "weight_g": 46000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 360 mm shaft carrying heavy radial load with misalignment or deflection, SKF lists 23972 under catalogue execution 23972 CC/W33: two barrel-roller rows on a sphered outer raceway. Digit by digit, 23972 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 39, and bore reference 72 resolving to 360 mm; 480 mm OD and 90 mm width are the matching ISO 15 boundary values. The suffix chain reads CC (two pressed-steel cages with a floating guide ring between the roller rows) plus W33 (annular groove and three lubrication holes in the outer ring for relubrication); CCK/W33 is the 1:12 tapered-bore counterpart. Selection arithmetic: the C0/C ratio is about 1.89 (static 2750 kN against dynamic 1456 kN), typical of a spherical roller sized for heavy combined loads, and the 220 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Mount with the spherical bearing's self-alignment in mind: it compensates ≈ 0.5–2.5° of misalignment depending on series, but the shaft and housing seats still set the datum — a rotating inner ring on a 360 mm shaft typically takes a m6 seat with an H7 housing bore.", "applications": [ "SAG and ball-mill drive shafts", "large mining crusher main shafts", "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "At 360 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23900-series series at 360 mm bore (480×90 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "The 23972 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 1456/2750 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The 46000 g mass and 90 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23972.", "The 1456/2750 kN ratings are SKF catalogue values for this exact execution (23972 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23972 (cylindrical bore as listed, tapered-bore 23972 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23972 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23972?", "a": "The 23972 CC/W33 is a double-row spherical roller bearing with 360 mm bore, 480 mm outer diameter and 90 mm width (14.173 × 18.898 × 3.543 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1456 kN, C0 2750 kN, fatigue load limit Pu 220 kN, reference speed 1,200 r/min, limiting speed 1,300 r/min, mass about 46000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23972 bore code work?", "a": "The last two digits of 23972 are bore code 72, so 72 × 5 = 360 mm bore. The 480 mm OD and 90 mm width come from the ISO 15 dimension-series plan (dimension series 39 (compact OD, narrow)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23972?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23972 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23972K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23972 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23972", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23972-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on OH3972 adapter sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C3972-M", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 3972 M shares the 360×480×90 mm envelope but catalogue C/C0 differ (1760/3250 kN vs 1456/2750 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C3972-KM", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 3972 KM shares the 360×480×90 mm envelope but catalogue C/C0 differ (1760/3250 kN vs 1456/2750 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23972", "23972 CC/W33" ], "locale_variants": {} }, { "sku": "23976", "brand": "SKF", "manufacturer_designation": "SKF 23976 CC/W33", "series": "23900-series", "type": "spherical_roller", "d_mm": 380, "D_mm": 520, "B_mm": 106, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2011, "static_load_kN": 3800, "fatigue_load_limit_kN": 285, "max_rpm": 1200, "reference_speed_rpm": 1100, "limiting_speed_rpm": 1200, "weight_g": 69000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 23976 CC/W33 is a 380×520×106 mm spherical roller bearing — the dimension series 39 (compact OD, narrow) entry for a 380 mm shaft, with two rows of symmetrical barrel rollers for combined radial and axial load. Reading the designation: the leading 2 marks a spherical roller bearing, the 39 is the ISO 15 dimension series (dimension series 39 (compact OD, narrow)), and the last two digits encode the 380 mm bore; the 520 mm OD and 106 mm width follow the ISO 15 general plan. SKF basic executions here are E or CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. Selection arithmetic: the C0/C ratio is about 1.89 (static 3800 kN against dynamic 2011 kN), typical of a spherical roller sized for heavy combined loads, and the 285 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. For relubrication, route the grease duct to the outer-ring W33 groove position where fitted, and purge until fresh grease appears at the seal — the 106 mm width across two roller rows needs the full charge.", "applications": [ "SAG and ball-mill drive shafts", "large mining crusher main shafts", "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 380 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23900-series series at 380 mm bore (520×106 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "Shaft and housing fillets must clear the bearing chamfer so the 106 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 2011/3800 kN ratings are SKF catalogue values for this exact execution (23976 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23976 (cylindrical bore as listed, tapered-bore 23976 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23976 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23976?", "a": "The 23976 CC/W33 is a double-row spherical roller bearing with 380 mm bore, 520 mm outer diameter and 106 mm width (14.961 × 20.472 × 4.173 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 2011 kN, C0 3800 kN, fatigue load limit Pu 285 kN, reference speed 1,100 r/min, limiting speed 1,200 r/min, mass about 69000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23976 bore code work?", "a": "The last two digits of 23976 are bore code 76, so 76 × 5 = 380 mm bore. The 520 mm OD and 106 mm width come from the ISO 15 dimension-series plan (dimension series 39 (compact OD, narrow)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23976?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23976 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23976K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23976 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23976", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23976-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on OH3976 adapter sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23976", "23976 CC/W33" ], "locale_variants": {} }, { "sku": "23980", "brand": "SKF", "manufacturer_designation": "SKF 23980 CC/W33", "series": "23900-series", "type": "spherical_roller", "d_mm": 400, "D_mm": 540, "B_mm": 106, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2038, "static_load_kN": 3900, "fatigue_load_limit_kN": 290, "max_rpm": 1200, "reference_speed_rpm": 1100, "limiting_speed_rpm": 1200, "weight_g": 71000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF 23980 (23980 CC/W33) is the spherical-roller choice for a 400 mm shaft — barrel rollers between an inner ring with two raceways and a common sphered outer raceway inside the 540×106 mm ISO 15 envelope. Digit by digit, 23980 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 39, and bore reference 80 resolving to 400 mm; 540 mm OD and 106 mm width are the matching ISO 15 boundary values. SKF basic executions here are E or CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. With C 2038 kN and C0 3900 kN, the 23980 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. For relubrication, route the grease duct to the outer-ring W33 groove position where fitted, and purge until fresh grease appears at the seal — the 106 mm width across two roller rows needs the full charge.", "applications": [ "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "steel-plant continuous-caster segments", "large induced-draft fan rotors" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "At 400 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23900-series series at 400 mm bore (540×106 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "The 23980 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 2038/3900 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23980; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 2038/3900 kN ratings are SKF catalogue values for this exact execution (23980 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23980 (cylindrical bore as listed, tapered-bore 23980 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23980 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23980?", "a": "The 23980 CC/W33 is a double-row spherical roller bearing with 400 mm bore, 540 mm outer diameter and 106 mm width (15.748 × 21.26 × 4.173 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 2038 kN, C0 3900 kN, fatigue load limit Pu 290 kN, reference speed 1,100 r/min, limiting speed 1,200 r/min, mass about 71000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23980 bore code work?", "a": "The last two digits of 23980 are bore code 80, so 80 × 5 = 400 mm bore. The 540 mm OD and 106 mm width come from the ISO 15 dimension-series plan (dimension series 39 (compact OD, narrow)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23980?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23980 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23980K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23980 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23980", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23980-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on OH3980 adapter sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C3980-KM", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3980 KM shares the 400×540×106 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23980", "23980 CC/W33" ], "locale_variants": {} }, { "sku": "23984", "brand": "SKF", "manufacturer_designation": "SKF 23984 CC/W33", "series": "23900-series", "type": "spherical_roller", "d_mm": 420, "D_mm": 560, "B_mm": 106, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2083, "static_load_kN": 4150, "fatigue_load_limit_kN": 300, "max_rpm": 1100, "reference_speed_rpm": 1000, "limiting_speed_rpm": 1100, "weight_g": 74500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 23984 appears as 23984 CC/W33: an open, double-row spherical roller bearing, self-aligning by virtue of the sphered outer raceway, sized 420×560×106 mm to the ISO 15 boundary plan. Reading the designation: the leading 2 marks a spherical roller bearing, the 39 is the ISO 15 dimension series (dimension series 39 (compact OD, narrow)), and the last two digits encode the 420 mm bore; the 560 mm OD and 106 mm width follow the ISO 15 general plan. SKF basic executions here are E or CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. Catalogue mass 74500 g for the 420×560×106 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. After mounting, swing the outer ring to confirm free self-alignment: the 23984 should tilt through its full catalogue misalignment range without binding; a stiff joint signals a cocked seat or shoulder interference.", "applications": [ "large dredger and marine winch drums", "steel-plant continuous-caster segments", "large induced-draft fan rotors", "SAG and ball-mill drive shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "At 420 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23900-series series at 420 mm bore (560×106 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 23984 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 2083/4150 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The 2083/4150 kN ratings are SKF catalogue values for this exact execution (23984 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23984 (cylindrical bore as listed, tapered-bore 23984 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23984 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23984?", "a": "The 23984 CC/W33 is a double-row spherical roller bearing with 420 mm bore, 560 mm outer diameter and 106 mm width (16.535 × 22.047 × 4.173 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 2083 kN, C0 4150 kN, fatigue load limit Pu 300 kN, reference speed 1,000 r/min, limiting speed 1,100 r/min, mass about 74500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23984 bore code work?", "a": "The last two digits of 23984 are bore code 84, so 84 × 5 = 420 mm bore. The 560 mm OD and 106 mm width come from the ISO 15 dimension-series plan (dimension series 39 (compact OD, narrow)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23984?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23984 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23984K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23984 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23984", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23984-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on OH3984 adapter sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C3984-M", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3984 M shares the 420×560×106 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C3984-KM", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3984 KM shares the 420×560×106 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23984", "23984 CC/W33" ], "locale_variants": {} }, { "sku": "23988", "brand": "SKF", "manufacturer_designation": "SKF 23988 CC/W33", "series": "23900-series", "type": "spherical_roller", "d_mm": 440, "D_mm": 600, "B_mm": 118, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2506, "static_load_kN": 4900, "fatigue_load_limit_kN": 345, "max_rpm": 1000, "reference_speed_rpm": 950, "limiting_speed_rpm": 1000, "weight_g": 99500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number 23988 CC/W33 in SKF catalogue PUB BU/P1 17000 denotes a double-row spherical roller bearing for a 440 mm shaft, dimension series 39 (compact OD, narrow), with open execution and two pressed-steel cages with a floating guide ring. The code breaks down as type digit 2 (double-row spherical roller), dimension series 39 (dimension series 39 (compact OD, narrow)), and bore code 88 = 440 mm; dimensions 440×600×118 mm therefore match the ISO 15 envelope. SKF basic executions here are E or CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. The 345 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.96 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.", "applications": [ "steel-plant continuous-caster segments", "large induced-draft fan rotors", "SAG and ball-mill drive shafts", "large mining crusher main shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "At 440 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23900-series series at 440 mm bore (600×118 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "Shaft and housing fillets must clear the bearing chamfer so the 118 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 2506/4900 kN ratings are SKF catalogue values for this exact execution (23988 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23988 (cylindrical bore as listed, tapered-bore 23988 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23988 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23988?", "a": "The 23988 CC/W33 is a double-row spherical roller bearing with 440 mm bore, 600 mm outer diameter and 118 mm width (17.323 × 23.622 × 4.646 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 2506 kN, C0 4900 kN, fatigue load limit Pu 345 kN, reference speed 950 r/min, limiting speed 1,000 r/min, mass about 99500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 23988 bore code work?", "a": "The last two digits of 23988 are bore code 88, so 88 × 5 = 440 mm bore. The 600 mm OD and 118 mm width come from the ISO 15 dimension-series plan (dimension series 39 (compact OD, narrow)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 23988?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23988 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23988K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23988 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23988-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 440×600×118 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "23988", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23988-CCK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on OH3988 adapter sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23988", "23988 CC/W33" ], "locale_variants": {} }, { "sku": "23992", "brand": "SKF", "manufacturer_designation": "SKF 23992 CA/W33", "series": "23900-series", "type": "spherical_roller", "d_mm": 460, "D_mm": 620, "B_mm": 118, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass_machined_M1", "dynamic_load_kN": 2558, "static_load_kN": 5000, "fatigue_load_limit_kN": 355, "max_rpm": 1000, "reference_speed_rpm": 600, "limiting_speed_rpm": 1000, "weight_g": 105000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "23992 CA/W33 belongs to the SKF spherical roller range — the 460 mm bore entry in the 23900-series series (dimension series 39 (compact OD, narrow)), dimensioned 620 mm OD and 118 mm wide. Reading the designation: the leading 2 marks a spherical roller bearing, the 39 is the ISO 15 dimension series (dimension series 39 (compact OD, narrow)), and the last two digits encode the 460 mm bore; the 620 mm OD and 118 mm width follow the ISO 15 general plan. CA executions here use a machined brass cage (inner-ring-guided) rather than pressed steel; specialist suffixes change the bearing materially and must be quoted in full, and the K/CCK tapered-bore variant is a separate order number. Speed planning uses two different ceilings: 600 r/min thermal reference and 1,000 r/min mechanical limiting speed. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.", "applications": [ "large mining crusher main shafts", "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems" ], "pitfalls": [ "At 460 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23900-series series at 460 mm bore (620×118 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23992 pits long before its L10 life.", "The 2558/5000 kN ratings are SKF catalogue values for this exact execution (23992 CA/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23992 (cylindrical bore as listed, tapered-bore 23992 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23992 CA/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23992?", "a": "The 23992 CA/W33 is a double-row spherical roller bearing with 460 mm bore, 620 mm outer diameter and 118 mm width (18.11 × 24.409 × 4.646 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 2558 kN, C0 5000 kN, fatigue load limit Pu 355 kN, reference speed 600 r/min, limiting speed 1,000 r/min, mass about 105000 g. It is an open, self-aligning bearing with a one-piece machined brass cage guided on the inner ring (CA design)." }, { "q": "How does the 23992 bore code work?", "a": "The last two digits of 23992 are bore code 92, so 92 × 5 = 460 mm bore. The 620 mm OD and 118 mm width come from the ISO 15 dimension-series plan (dimension series 39 (compact OD, narrow)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CA/W33 suffix mean on 23992?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23992 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23992K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23992 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23992-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "23992", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23992-CAK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on OH3992 adapter sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23992", "23992 CA/W33" ], "locale_variants": {} }, { "sku": "23996", "brand": "SKF", "manufacturer_designation": "SKF 23996 CA/W33", "series": "23900-series", "type": "spherical_roller", "d_mm": 480, "D_mm": 650, "B_mm": 128, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass_machined_M1", "dynamic_load_kN": 2990, "static_load_kN": 5700, "fatigue_load_limit_kN": 405, "max_rpm": 1000, "reference_speed_rpm": 560, "limiting_speed_rpm": 1000, "weight_g": 125000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "23996 is a double-row spherical roller bearing in the 23900-series family: two rows of barrel rollers on a common sphered outer raceway, self-aligning under shaft deflection, listed by SKF in SKF catalogue PUB BU/P1 17000. The code breaks down as type digit 2 (double-row spherical roller), dimension series 39 (dimension series 39 (compact OD, narrow)), and bore code 96 = 480 mm; dimensions 480×650×128 mm therefore match the ISO 15 envelope. CA executions here use a machined brass cage (inner-ring-guided) rather than pressed steel; specialist suffixes change the bearing materially and must be quoted in full, and the K/CCK tapered-bore variant is a separate order number. The 85.0 mm radial section height ((650−480)/2) and 125000 g catalogue mass frame a 480 mm bore bearing rated at 2990 kN C — roughly 6.23 kN of dynamic capacity per millimetre of bore before application factors. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 23996 CCK/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.", "applications": [ "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "steel-plant continuous-caster segments" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems" ], "pitfalls": [ "At 480 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23900-series series at 480 mm bore (650×128 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "Shaft and housing fillets must clear the bearing chamfer so the 128 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23996; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 2990/5700 kN ratings are SKF catalogue values for this exact execution (23996 CA/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 23996 (cylindrical bore as listed, tapered-bore 23996 CCK/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 23996 CA/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23996?", "a": "The 23996 CA/W33 is a double-row spherical roller bearing with 480 mm bore, 650 mm outer diameter and 128 mm width (18.898 × 25.591 × 5.039 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 2990 kN, C0 5700 kN, fatigue load limit Pu 405 kN, reference speed 560 r/min, limiting speed 1,000 r/min, mass about 125000 g. It is an open, self-aligning bearing with a one-piece machined brass cage guided on the inner ring (CA design)." }, { "q": "How does the 23996 bore code work?", "a": "The last two digits of 23996 are bore code 96, so 96 × 5 = 480 mm bore. The 650 mm OD and 128 mm width come from the ISO 15 dimension-series plan (dimension series 39 (compact OD, narrow)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CA/W33 suffix mean on 23996?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. CCK/W33 is the 1:12 tapered-bore counterpart." }, { "q": "Can 23996 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 23996K variant be used instead?", "a": "Choose the K (1:12 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 23996 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "23996-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 480×650×128 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "23996", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "23996-CAK-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) execution on OH3996 adapter sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C3996-M", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3996 M shares the 480×650×128 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23996", "23996 CA/W33" ], "locale_variants": {} }, { "sku": "24013", "brand": "SKF", "manufacturer_designation": "SKF 24013 CC/W33", "series": "24000-series", "type": "spherical_roller", "d_mm": 65, "D_mm": 100, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 137, "static_load_kN": 173, "fatigue_load_limit_kN": 20.4, "max_rpm": 6300, "reference_speed_rpm": 4300, "limiting_speed_rpm": 6300, "weight_g": 950, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "24013 is a double-row spherical roller bearing in the 24000-series family: two rows of barrel rollers on a common sphered outer raceway, self-aligning under shaft deflection, listed by SKF in SKF catalogue PUB BU/P1 17000. On the SKF nameplate, 24013 follows the ISO 15 convention: 2 for the spherical roller type, 40 for the dimension series 40 (compact OD, maximum width), final digits 13 for the 65 mm bore. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. Catalogue mass 950 g for the 65×100×35 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. A 65 mm rotating inner ring usually runs k5 on the shaft with H7 in the housing; for vibrating-screen duty the outer ring is instead held tight and the shaft seat loosened — follow the screen builder's fit schedule.", "applications": [ "marine propulsion and thruster shafts", "cement-mill trunnion and drive shafts", "heavy conveyor head shafts in mining", "jaw and cone crusher main shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems" ], "pitfalls": [ "Mount the 65 mm bore 24013 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 24000-series series at 65 mm bore (100×35 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.", "Never use the tapered-bore CCK30/K30 variant's drive-up figures on this cylindrical-bore 24013; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 950 g mass and 35 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 24013.", "The 137/173 kN ratings are SKF catalogue values for this exact execution (24013 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 24013 (cylindrical bore as listed, tapered-bore 24013 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24013 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24013?", "a": "The 24013 CC/W33 is a double-row spherical roller bearing with 65 mm bore, 100 mm outer diameter and 35 mm width (2.559 × 3.937 × 1.378 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 137 kN, C0 173 kN, fatigue load limit Pu 20.4 kN, reference speed 4,300 r/min, limiting speed 6,300 r/min, mass about 950 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 24013 bore code work?", "a": "The last two digits of 24013 are bore code 13, so 13 × 5 = 65 mm bore. The 100 mm OD and 35 mm width come from the ISO 15 dimension-series plan (dimension series 40 (compact OD, maximum width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 24013?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper." }, { "q": "Can 24013 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 24013K30 variant be used instead?", "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24013 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "24013", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "C4013-2CS5V-GEM9", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 4013-2CS5V/GEM9 shares the 65×100×35 mm envelope but catalogue C/C0 differ (102/173 kN vs 137/173 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24013", "24013 CC/W33" ], "locale_variants": {} }, { "sku": "24015", "brand": "SKF", "manufacturer_designation": "SKF 24015 CC/W33", "series": "24000-series", "type": "spherical_roller", "d_mm": 75, "D_mm": 115, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 181, "static_load_kN": 232, "fatigue_load_limit_kN": 28.5, "max_rpm": 5300, "reference_speed_rpm": 3800, "limiting_speed_rpm": 5300, "weight_g": 1550, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 24015 appears as 24015 CC/W33: an open, double-row spherical roller bearing, self-aligning by virtue of the sphered outer raceway, sized 75×115×40 mm to the ISO 15 boundary plan. Reading the designation: the leading 2 marks a spherical roller bearing, the 40 is the ISO 15 dimension series (dimension series 40 (compact OD, maximum width)), and the last two digits encode the 75 mm bore; the 115 mm OD and 40 mm width follow the ISO 15 general plan. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. Speed planning uses two different ceilings: 3,800 r/min thermal reference and 5,300 r/min mechanical limiting speed. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 24015 CCK30/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.", "applications": [ "paper-machine press and dryer rolls", "rolling-mill pinion and back-up shafts", "large vibrating screens and feeders", "marine propulsion and thruster shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount the 75 mm bore 24015 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 24000-series series at 75 mm bore (115×40 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.", "Catalogue reference speed and limiting speed are different limits: the 3,800 r/min reference is a thermal criterion under load, while the 5,300 r/min limiting value is the mechanical ceiling — observe both.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 181/232 kN ratings are SKF catalogue values for this exact execution (24015 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 24015 (cylindrical bore as listed, tapered-bore 24015 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24015 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24015?", "a": "The 24015 CC/W33 is a double-row spherical roller bearing with 75 mm bore, 115 mm outer diameter and 40 mm width (2.953 × 4.528 × 1.575 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 181 kN, C0 232 kN, fatigue load limit Pu 28.5 kN, reference speed 3,800 r/min, limiting speed 5,300 r/min, mass about 1550 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 24015 bore code work?", "a": "The last two digits of 24015 are bore code 15, so 15 × 5 = 75 mm bore. The 115 mm OD and 40 mm width come from the ISO 15 dimension-series plan (dimension series 40 (compact OD, maximum width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 24015?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper." }, { "q": "Can 24015 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 24015K30 variant be used instead?", "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24015 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "24015", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "C4015-V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 4015 V shares the 75×115×40 mm envelope but catalogue C/C0 differ (208/345 kN vs 181/232 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24015", "24015 CC/W33" ], "locale_variants": {} }, { "sku": "24020", "brand": "SKF", "manufacturer_designation": "SKF 24020 CC/W33", "series": "24000-series", "type": "spherical_roller", "d_mm": 100, "D_mm": 150, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 296, "static_load_kN": 415, "fatigue_load_limit_kN": 45.5, "max_rpm": 4000, "reference_speed_rpm": 2800, "limiting_speed_rpm": 4000, "weight_g": 3150, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "24020 is a double-row spherical roller bearing in the 24000-series family: two rows of barrel rollers on a common sphered outer raceway, self-aligning under shaft deflection, listed by SKF in SKF catalogue PUB BU/P1 17000. Numbering ties the bearing to its envelope: 24020 means spherical-roller type, dimension series 40, 100 mm bore — which is why the 150×50 mm outline swaps dimensionally with other ISO 15 bearings of the same code. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. At 2,800 r/min reference speed the 25.0 mm-section 24020 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 4,000 r/min as the mechanical ceiling. Mount with the spherical bearing's self-alignment in mind: it compensates ≈ 0.5–2.5° of misalignment depending on series, but the shaft and housing seats still set the datum — a rotating inner ring on a 100 mm shaft typically takes a k5 seat with an H7 housing bore.", "applications": [ "heavy conveyor head shafts in mining", "jaw and cone crusher main shafts", "paper-machine press and dryer rolls", "rolling-mill pinion and back-up shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount the 100 mm bore 24020 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 24000-series series at 100 mm bore (150×50 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.", "The 3150 g mass and 50 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 24020.", "The 24020 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 296/415 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The 296/415 kN ratings are SKF catalogue values for this exact execution (24020 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 24020 (cylindrical bore as listed, tapered-bore 24020 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24020 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24020?", "a": "The 24020 CC/W33 is a double-row spherical roller bearing with 100 mm bore, 150 mm outer diameter and 50 mm width (3.937 × 5.906 × 1.969 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 296 kN, C0 415 kN, fatigue load limit Pu 45.5 kN, reference speed 2,800 r/min, limiting speed 4,000 r/min, mass about 3150 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 24020 bore code work?", "a": "The last two digits of 24020 are bore code 20, so 20 × 5 = 100 mm bore. The 150 mm OD and 50 mm width come from the ISO 15 dimension-series plan (dimension series 40 (compact OD, maximum width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 24020?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper." }, { "q": "Can 24020 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 24020K30 variant be used instead?", "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24020 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "24020", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "C4020-V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 4020 V shares the 100×150×50 mm envelope but catalogue C/C0 differ (355/530 kN vs 296/415 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24020", "24020 CC/W33" ], "locale_variants": {} }, { "sku": "24022", "brand": "SKF", "manufacturer_designation": "SKF 24022 CC/W33", "series": "24000-series", "type": "spherical_roller", "d_mm": 110, "D_mm": 170, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 437, "static_load_kN": 620, "fatigue_load_limit_kN": 67, "max_rpm": 3600, "reference_speed_rpm": 2400, "limiting_speed_rpm": 3600, "weight_g": 5000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 24022 appears as 24022 CC/W33: an open, double-row spherical roller bearing, self-aligning by virtue of the sphered outer raceway, sized 110×170×60 mm to the ISO 15 boundary plan. The code breaks down as type digit 2 (double-row spherical roller), dimension series 40 (dimension series 40 (compact OD, maximum width)), and bore code 22 = 110 mm; dimensions 110×170×60 mm therefore match the ISO 15 envelope. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. With C 437 kN and C0 620 kN, the 24022 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.", "applications": [ "large vibrating screens and feeders", "marine propulsion and thruster shafts", "cement-mill trunnion and drive shafts", "heavy conveyor head shafts in mining" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems" ], "pitfalls": [ "Mount the 110 mm bore 24022 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 24000-series series at 110 mm bore (170×60 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 5000 g mass and 60 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 24022.", "The 437/620 kN ratings are SKF catalogue values for this exact execution (24022 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 24022 (cylindrical bore as listed, tapered-bore 24022 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24022 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24022?", "a": "The 24022 CC/W33 is a double-row spherical roller bearing with 110 mm bore, 170 mm outer diameter and 60 mm width (4.331 × 6.693 × 2.362 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 437 kN, C0 620 kN, fatigue load limit Pu 67 kN, reference speed 2,400 r/min, limiting speed 3,600 r/min, mass about 5000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 24022 bore code work?", "a": "The last two digits of 24022 are bore code 22, so 22 × 5 = 110 mm bore. The 170 mm OD and 60 mm width come from the ISO 15 dimension-series plan (dimension series 40 (compact OD, maximum width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 24022?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper." }, { "q": "Can 24022 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 24022K30 variant be used instead?", "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24022 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "24022", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "C4022-2CS5V-GEM9", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 4022-2CS5V/GEM9 shares the 110×170×60 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C4022-MB", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 4022 MB shares the 110×170×60 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C4022-V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 4022 V shares the 110×170×60 mm envelope but catalogue C/C0 differ (500/800 kN vs 437/620 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24022", "24022 CC/W33" ], "locale_variants": {} }, { "sku": "24024", "brand": "SKF", "manufacturer_designation": "SKF 24024 CC/W33", "series": "24000-series", "type": "spherical_roller", "d_mm": 120, "D_mm": 180, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 456, "static_load_kN": 670, "fatigue_load_limit_kN": 68, "max_rpm": 3400, "reference_speed_rpm": 2400, "limiting_speed_rpm": 3400, "weight_g": 5450, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 120 mm shaft carrying heavy radial load with misalignment or deflection, SKF lists 24024 under catalogue execution 24024 CC/W33: two barrel-roller rows on a sphered outer raceway. Digit by digit, 24024 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 40, and bore reference 24 resolving to 120 mm; 180 mm OD and 60 mm width are the matching ISO 15 boundary values. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. Selection arithmetic: the C0/C ratio is about 1.47 (static 670 kN against dynamic 456 kN), typical of a spherical roller sized for heavy combined loads, and the 68 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. A 120 mm rotating inner ring usually runs m6 on the shaft with H7 in the housing; for vibrating-screen duty the outer ring is instead held tight and the shaft seat loosened — follow the screen builder's fit schedule.", "applications": [ "SAG and ball-mill drive shafts", "large mining crusher main shafts", "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 120 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24000-series series at 120 mm bore (180×60 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 24024 pits long before its L10 life.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 456/670 kN ratings are SKF catalogue values for this exact execution (24024 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 24024 (cylindrical bore as listed, tapered-bore 24024 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24024 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24024?", "a": "The 24024 CC/W33 is a double-row spherical roller bearing with 120 mm bore, 180 mm outer diameter and 60 mm width (4.724 × 7.087 × 2.362 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 456 kN, C0 670 kN, fatigue load limit Pu 68 kN, reference speed 2,400 r/min, limiting speed 3,400 r/min, mass about 5450 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 24024 bore code work?", "a": "The last two digits of 24024 are bore code 24, so 24 × 5 = 120 mm bore. The 180 mm OD and 60 mm width come from the ISO 15 dimension-series plan (dimension series 40 (compact OD, maximum width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 24024?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper." }, { "q": "Can 24024 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 24024K30 variant be used instead?", "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24024 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "24024", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "24024-CCK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) execution on AH24024 withdrawal sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C4024-2CS5V-GEM9", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 4024-2CS5V/GEM9 shares the 120×180×60 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C4024-V-VE240", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 4024 V/VE240 shares the 120×180×60 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C4024-K30V-VE240", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 4024 K30V/VE240 shares the 120×180×60 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C4024-V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 4024 V shares the 120×180×60 mm envelope but catalogue C/C0 differ (530/880 kN vs 456/670 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C4024-K30V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 4024 K30V shares the 120×180×60 mm envelope but catalogue C/C0 differ (530/880 kN vs 456/670 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24024", "24024 CC/W33" ], "locale_variants": {} }, { "sku": "24026", "brand": "SKF", "manufacturer_designation": "SKF 24026 CC/W33", "series": "24000-series", "type": "spherical_roller", "d_mm": 130, "D_mm": 200, "B_mm": 69, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 569, "static_load_kN": 815, "fatigue_load_limit_kN": 81.5, "max_rpm": 3000, "reference_speed_rpm": 2000, "limiting_speed_rpm": 3000, "weight_g": 8050, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number 24026 CC/W33 in SKF catalogue PUB BU/P1 17000 denotes a double-row spherical roller bearing for a 130 mm shaft, dimension series 40 (compact OD, maximum width), with open execution and two pressed-steel cages with a floating guide ring. On the SKF nameplate, 24026 follows the ISO 15 convention: 2 for the spherical roller type, 40 for the dimension series 40 (compact OD, maximum width), final digits 26 for the 130 mm bore. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. Catalogue mass 8050 g for the 130×200×69 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 24026 CCK30/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.", "applications": [ "large dredger and marine winch drums", "steel-plant continuous-caster segments", "large induced-draft fan rotors", "SAG and ball-mill drive shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems" ], "pitfalls": [ "At 130 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24000-series series at 130 mm bore (200×69 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.", "Shaft and housing fillets must clear the bearing chamfer so the 69 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 24026 pits long before its L10 life.", "The 569/815 kN ratings are SKF catalogue values for this exact execution (24026 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 24026 (cylindrical bore as listed, tapered-bore 24026 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24026 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24026?", "a": "The 24026 CC/W33 is a double-row spherical roller bearing with 130 mm bore, 200 mm outer diameter and 69 mm width (5.118 × 7.874 × 2.717 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 569 kN, C0 815 kN, fatigue load limit Pu 81.5 kN, reference speed 2,000 r/min, limiting speed 3,000 r/min, mass about 8050 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 24026 bore code work?", "a": "The last two digits of 24026 are bore code 26, so 26 × 5 = 130 mm bore. The 200 mm OD and 69 mm width come from the ISO 15 dimension-series plan (dimension series 40 (compact OD, maximum width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 24026?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper." }, { "q": "Can 24026 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 24026K30 variant be used instead?", "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24026 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "24026", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "24026-CCK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) execution on AH24026 withdrawal sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C4026-2CS5V-GEM9", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 4026-2CS5V/GEM9 shares the 130×200×69 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C4026", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 4026 shares the 130×200×69 mm envelope but catalogue C/C0 differ (620/930 kN vs 569/815 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C4026-K30", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 4026 K30 shares the 130×200×69 mm envelope but catalogue C/C0 differ (620/930 kN vs 569/815 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C4026-V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 4026 V shares the 130×200×69 mm envelope but catalogue C/C0 differ (720/1120 kN vs 569/815 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C4026-K30V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 4026 K30V shares the 130×200×69 mm envelope but catalogue C/C0 differ (720/1120 kN vs 569/815 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24026", "24026 CC/W33" ], "locale_variants": {} }, { "sku": "24028", "brand": "SKF", "manufacturer_designation": "SKF 24028 CC/W33", "series": "24000-series", "type": "spherical_roller", "d_mm": 140, "D_mm": 210, "B_mm": 69, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 600, "static_load_kN": 900, "fatigue_load_limit_kN": 88, "max_rpm": 2800, "reference_speed_rpm": 2000, "limiting_speed_rpm": 2800, "weight_g": 8550, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 24028 CC/W33 is a 140×210×69 mm spherical roller bearing — the dimension series 40 (compact OD, maximum width) entry for a 140 mm shaft, with two rows of symmetrical barrel rollers for combined radial and axial load. Reading the designation: the leading 2 marks a spherical roller bearing, the 40 is the ISO 15 dimension series (dimension series 40 (compact OD, maximum width)), and the last two digits encode the 140 mm bore; the 210 mm OD and 69 mm width follow the ISO 15 general plan. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. Speed planning uses two different ceilings: 2,000 r/min thermal reference and 2,800 r/min mechanical limiting speed. For relubrication, route the grease duct to the outer-ring W33 groove position where fitted, and purge until fresh grease appears at the seal — the 69 mm width across two roller rows needs the full charge.", "applications": [ "large mining crusher main shafts", "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 140 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24000-series series at 140 mm bore (210×69 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.", "Never use the tapered-bore CCK30/K30 variant's drive-up figures on this cylindrical-bore 24028; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "Shaft and housing fillets must clear the bearing chamfer so the 69 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 600/900 kN ratings are SKF catalogue values for this exact execution (24028 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 24028 (cylindrical bore as listed, tapered-bore 24028 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24028 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24028?", "a": "The 24028 CC/W33 is a double-row spherical roller bearing with 140 mm bore, 210 mm outer diameter and 69 mm width (5.512 × 8.268 × 2.717 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 600 kN, C0 900 kN, fatigue load limit Pu 88 kN, reference speed 2,000 r/min, limiting speed 2,800 r/min, mass about 8550 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 24028 bore code work?", "a": "The last two digits of 24028 are bore code 28, so 28 × 5 = 140 mm bore. The 210 mm OD and 69 mm width come from the ISO 15 dimension-series plan (dimension series 40 (compact OD, maximum width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 24028?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper." }, { "q": "Can 24028 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 24028K30 variant be used instead?", "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24028 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "24028", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "24028-CCK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) execution on AH24028 withdrawal sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C4028-V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 4028 V shares the 140×210×69 mm envelope but catalogue C/C0 differ (750/1220 kN vs 600/900 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C4028-K30V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 4028 K30V shares the 140×210×69 mm envelope but catalogue C/C0 differ (750/1220 kN vs 600/900 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24028", "24028 CC/W33" ], "locale_variants": {} }, { "sku": "24030", "brand": "SKF", "manufacturer_designation": "SKF 24030 CC/W33", "series": "24000-series", "type": "spherical_roller", "d_mm": 150, "D_mm": 225, "B_mm": 75, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 680, "static_load_kN": 1040, "fatigue_load_limit_kN": 100, "max_rpm": 2600, "reference_speed_rpm": 1800, "limiting_speed_rpm": 2600, "weight_g": 10500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "24030 CC/W33 belongs to the SKF spherical roller range — the 150 mm bore entry in the 24000-series series (dimension series 40 (compact OD, maximum width)), dimensioned 225 mm OD and 75 mm wide. The code breaks down as type digit 2 (double-row spherical roller), dimension series 40 (dimension series 40 (compact OD, maximum width)), and bore code 30 = 150 mm; dimensions 150×225×75 mm therefore match the ISO 15 envelope. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. Selection arithmetic: the C0/C ratio is about 1.53 (static 1040 kN against dynamic 680 kN), typical of a spherical roller sized for heavy combined loads, and the 100 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 24030 CCK30/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.", "applications": [ "SAG and ball-mill drive shafts", "large mining crusher main shafts", "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still" ], "pitfalls": [ "At 150 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24000-series series at 150 mm bore (225×75 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "Shaft and housing fillets must clear the bearing chamfer so the 75 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 680/1040 kN ratings are SKF catalogue values for this exact execution (24030 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 24030 (cylindrical bore as listed, tapered-bore 24030 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24030 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24030?", "a": "The 24030 CC/W33 is a double-row spherical roller bearing with 150 mm bore, 225 mm outer diameter and 75 mm width (5.906 × 8.858 × 2.953 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 680 kN, C0 1040 kN, fatigue load limit Pu 100 kN, reference speed 1,800 r/min, limiting speed 2,600 r/min, mass about 10500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 24030 bore code work?", "a": "The last two digits of 24030 are bore code 30, so 30 × 5 = 150 mm bore. The 225 mm OD and 75 mm width come from the ISO 15 dimension-series plan (dimension series 40 (compact OD, maximum width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 24030?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper." }, { "q": "Can 24030 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 24030K30 variant be used instead?", "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24030 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "24030", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "24030-CCK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) execution on AH24030 withdrawal sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C4030-2CS5V-GEM9", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 4030-2CS5V/GEM9 shares the 150×225×75 mm envelope but catalogue C/C0 differ (585/965 kN vs 680/1040 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C4030-V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 4030 V shares the 150×225×75 mm envelope but catalogue C/C0 differ (780/1320 kN vs 680/1040 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C4030-K30V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 4030 K30V shares the 150×225×75 mm envelope but catalogue C/C0 differ (780/1320 kN vs 680/1040 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24030", "24030 CC/W33" ], "locale_variants": {} }, { "sku": "24032", "brand": "SKF", "manufacturer_designation": "SKF 24032 CC/W33", "series": "24000-series", "type": "spherical_roller", "d_mm": 160, "D_mm": 240, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 783, "static_load_kN": 1200, "fatigue_load_limit_kN": 114, "max_rpm": 2400, "reference_speed_rpm": 1700, "limiting_speed_rpm": 2400, "weight_g": 13000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF 24032 (24032 CC/W33) is the spherical-roller choice for a 160 mm shaft — barrel rollers between an inner ring with two raceways and a common sphered outer raceway inside the 240×80 mm ISO 15 envelope. Digit by digit, 24032 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 40, and bore reference 32 resolving to 160 mm; 240 mm OD and 80 mm width are the matching ISO 15 boundary values. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. Catalogue mass 13000 g for the 160×240×80 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. For relubrication, route the grease duct to the outer-ring W33 groove position where fitted, and purge until fresh grease appears at the seal — the 80 mm width across two roller rows needs the full charge.", "applications": [ "large dredger and marine winch drums", "steel-plant continuous-caster segments", "large induced-draft fan rotors", "SAG and ball-mill drive shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "At 160 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24000-series series at 160 mm bore (240×80 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 24032 pits long before its L10 life.", "Never use the tapered-bore CCK30/K30 variant's drive-up figures on this cylindrical-bore 24032; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 783/1200 kN ratings are SKF catalogue values for this exact execution (24032 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 24032 (cylindrical bore as listed, tapered-bore 24032 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24032 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24032?", "a": "The 24032 CC/W33 is a double-row spherical roller bearing with 160 mm bore, 240 mm outer diameter and 80 mm width (6.299 × 9.449 × 3.15 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 783 kN, C0 1200 kN, fatigue load limit Pu 114 kN, reference speed 1,700 r/min, limiting speed 2,400 r/min, mass about 13000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 24032 bore code work?", "a": "The last two digits of 24032 are bore code 32, so 32 × 5 = 160 mm bore. The 240 mm OD and 80 mm width come from the ISO 15 dimension-series plan (dimension series 40 (compact OD, maximum width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 24032?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper." }, { "q": "Can 24032 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 24032K30 variant be used instead?", "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24032 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "24032", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "24032-CCK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) execution on AH24032 withdrawal sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C4032", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 4032 shares the 160×240×80 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C4032-K30", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 4032 K30 shares the 160×240×80 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C4032-2CS5V-GEM9", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 4032-2CS5V/GEM9 shares the 160×240×80 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C4032-V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 4032 V shares the 160×240×80 mm envelope but catalogue C/C0 differ (915/1460 kN vs 783/1200 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C4032-K30V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 4032 K30V shares the 160×240×80 mm envelope but catalogue C/C0 differ (915/1460 kN vs 783/1200 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24032", "24032 CC/W33" ], "locale_variants": {} }, { "sku": "24034", "brand": "SKF", "manufacturer_designation": "SKF 24034 CC/W33", "series": "24000-series", "type": "spherical_roller", "d_mm": 170, "D_mm": 260, "B_mm": 90, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 963, "static_load_kN": 1460, "fatigue_load_limit_kN": 137, "max_rpm": 2400, "reference_speed_rpm": 1600, "limiting_speed_rpm": 2400, "weight_g": 17500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "24034 is a double-row spherical roller bearing in the 24000-series family: two rows of barrel rollers on a common sphered outer raceway, self-aligning under shaft deflection, listed by SKF in SKF catalogue PUB BU/P1 17000. On the SKF nameplate, 24034 follows the ISO 15 convention: 2 for the spherical roller type, 40 for the dimension series 40 (compact OD, maximum width), final digits 34 for the 170 mm bore. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. Speed planning uses two different ceilings: 1,600 r/min thermal reference and 2,400 r/min mechanical limiting speed. Drive-on force must go through the ring being fitted: press or induction-heat the inner ring onto the 170 mm shaft (max 120 °C) and never transmit mounting force through the roller complement, or the raceways brinell.", "applications": [ "large mining crusher main shafts", "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still" ], "pitfalls": [ "At 170 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24000-series series at 170 mm bore (260×90 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.", "Shaft and housing fillets must clear the bearing chamfer so the 90 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "Catalogue reference speed and limiting speed are different limits: the 1,600 r/min reference is a thermal criterion under load, while the 2,400 r/min limiting value is the mechanical ceiling — observe both.", "The 963/1460 kN ratings are SKF catalogue values for this exact execution (24034 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 24034 (cylindrical bore as listed, tapered-bore 24034 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24034 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24034?", "a": "The 24034 CC/W33 is a double-row spherical roller bearing with 170 mm bore, 260 mm outer diameter and 90 mm width (6.693 × 10.236 × 3.543 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 963 kN, C0 1460 kN, fatigue load limit Pu 137 kN, reference speed 1,600 r/min, limiting speed 2,400 r/min, mass about 17500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 24034 bore code work?", "a": "The last two digits of 24034 are bore code 34, so 34 × 5 = 170 mm bore. The 260 mm OD and 90 mm width come from the ISO 15 dimension-series plan (dimension series 40 (compact OD, maximum width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 24034?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper." }, { "q": "Can 24034 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 24034K30 variant be used instead?", "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24034 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "24034", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "24034-CCK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) execution on AH24034 withdrawal sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C4034-V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 4034 V shares the 170×260×90 mm envelope but catalogue C/C0 differ (1140/1860 kN vs 963/1460 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C4034-K30V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 4034 K30V shares the 170×260×90 mm envelope but catalogue C/C0 differ (1140/1860 kN vs 963/1460 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24034", "24034 CC/W33" ], "locale_variants": {} }, { "sku": "24036", "brand": "SKF", "manufacturer_designation": "SKF 24036 CC/W33", "series": "24000-series", "type": "spherical_roller", "d_mm": 180, "D_mm": 280, "B_mm": 100, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1134, "static_load_kN": 1730, "fatigue_load_limit_kN": 156, "max_rpm": 2200, "reference_speed_rpm": 1500, "limiting_speed_rpm": 2200, "weight_g": 23000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 24036 appears as 24036 CC/W33: an open, double-row spherical roller bearing, self-aligning by virtue of the sphered outer raceway, sized 180×280×100 mm to the ISO 15 boundary plan. Reading the designation: the leading 2 marks a spherical roller bearing, the 40 is the ISO 15 dimension series (dimension series 40 (compact OD, maximum width)), and the last two digits encode the 180 mm bore; the 280 mm OD and 100 mm width follow the ISO 15 general plan. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. The 156 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.53 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. After mounting, swing the outer ring to confirm free self-alignment: the 24036 should tilt through its full catalogue misalignment range without binding; a stiff joint signals a cocked seat or shoulder interference.", "applications": [ "steel-plant continuous-caster segments", "large induced-draft fan rotors", "SAG and ball-mill drive shafts", "large mining crusher main shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "At 180 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24000-series series at 180 mm bore (280×100 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.", "Never use the tapered-bore CCK30/K30 variant's drive-up figures on this cylindrical-bore 24036; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 24036 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 1134/1730 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The 1134/1730 kN ratings are SKF catalogue values for this exact execution (24036 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 24036 (cylindrical bore as listed, tapered-bore 24036 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24036 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24036?", "a": "The 24036 CC/W33 is a double-row spherical roller bearing with 180 mm bore, 280 mm outer diameter and 100 mm width (7.087 × 11.024 × 3.937 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1134 kN, C0 1730 kN, fatigue load limit Pu 156 kN, reference speed 1,500 r/min, limiting speed 2,200 r/min, mass about 23000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 24036 bore code work?", "a": "The last two digits of 24036 are bore code 36, so 36 × 5 = 180 mm bore. The 280 mm OD and 100 mm width come from the ISO 15 dimension-series plan (dimension series 40 (compact OD, maximum width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 24036?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper." }, { "q": "Can 24036 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 24036K30 variant be used instead?", "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24036 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "24036", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "24036-CCK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) execution on AH24036 withdrawal sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C4036-V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 4036 V shares the 180×280×100 mm envelope but catalogue C/C0 differ (1320/2120 kN vs 1134/1730 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24036", "24036 CC/W33" ], "locale_variants": {} }, { "sku": "24038", "brand": "SKF", "manufacturer_designation": "SKF 24038 CC/W33", "series": "24000-series", "type": "spherical_roller", "d_mm": 190, "D_mm": 290, "B_mm": 100, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1164, "static_load_kN": 1800, "fatigue_load_limit_kN": 163, "max_rpm": 2000, "reference_speed_rpm": 1400, "limiting_speed_rpm": 2000, "weight_g": 24500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 190 mm shaft carrying heavy radial load with misalignment or deflection, SKF lists 24038 under catalogue execution 24038 CC/W33: two barrel-roller rows on a sphered outer raceway. Numbering ties the bearing to its envelope: 24038 means spherical-roller type, dimension series 40, 190 mm bore — which is why the 290×100 mm outline swaps dimensionally with other ISO 15 bearings of the same code. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. The 50.0 mm radial section height ((290−190)/2) and 24500 g catalogue mass frame a 190 mm bore bearing rated at 1164 kN C — roughly 6.13 kN of dynamic capacity per millimetre of bore before application factors. Mount with the spherical bearing's self-alignment in mind: it compensates ≈ 0.5–2.5° of misalignment depending on series, but the shaft and housing seats still set the datum — a rotating inner ring on a 190 mm shaft typically takes a m6 seat with an H7 housing bore.", "applications": [ "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "steel-plant continuous-caster segments" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still" ], "pitfalls": [ "At 190 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24000-series series at 190 mm bore (290×100 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.", "Catalogue reference speed and limiting speed are different limits: the 1,400 r/min reference is a thermal criterion under load, while the 2,000 r/min limiting value is the mechanical ceiling — observe both.", "The 24500 g mass and 100 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 24038.", "The 1164/1800 kN ratings are SKF catalogue values for this exact execution (24038 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 24038 (cylindrical bore as listed, tapered-bore 24038 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24038 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24038?", "a": "The 24038 CC/W33 is a double-row spherical roller bearing with 190 mm bore, 290 mm outer diameter and 100 mm width (7.48 × 11.417 × 3.937 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1164 kN, C0 1800 kN, fatigue load limit Pu 163 kN, reference speed 1,400 r/min, limiting speed 2,000 r/min, mass about 24500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 24038 bore code work?", "a": "The last two digits of 24038 are bore code 38, so 38 × 5 = 190 mm bore. The 290 mm OD and 100 mm width come from the ISO 15 dimension-series plan (dimension series 40 (compact OD, maximum width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 24038?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper." }, { "q": "Can 24038 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 24038K30 variant be used instead?", "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24038 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "24038", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "24038-CCK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) execution on AH24038 withdrawal sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24038", "24038 CC/W33" ], "locale_variants": {} }, { "sku": "24040", "brand": "SKF", "manufacturer_designation": "SKF 24040 CC/W33", "series": "24000-series", "type": "spherical_roller", "d_mm": 200, "D_mm": 310, "B_mm": 109, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1353, "static_load_kN": 2120, "fatigue_load_limit_kN": 186, "max_rpm": 1900, "reference_speed_rpm": 1300, "limiting_speed_rpm": 1900, "weight_g": 31000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number 24040 CC/W33 in SKF catalogue PUB BU/P1 17000 denotes a double-row spherical roller bearing for a 200 mm shaft, dimension series 40 (compact OD, maximum width), with open execution and two pressed-steel cages with a floating guide ring. Digit by digit, 24040 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 40, and bore reference 40 resolving to 200 mm; 310 mm OD and 109 mm width are the matching ISO 15 boundary values. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. Speed planning uses two different ceilings: 1,300 r/min thermal reference and 1,900 r/min mechanical limiting speed. After mounting, swing the outer ring to confirm free self-alignment: the 24040 should tilt through its full catalogue misalignment range without binding; a stiff joint signals a cocked seat or shoulder interference.", "applications": [ "large mining crusher main shafts", "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems" ], "pitfalls": [ "At 200 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24000-series series at 200 mm bore (310×109 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 24040 pits long before its L10 life.", "The 31000 g mass and 109 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 24040.", "The 1353/2120 kN ratings are SKF catalogue values for this exact execution (24040 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 24040 (cylindrical bore as listed, tapered-bore 24040 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24040 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24040?", "a": "The 24040 CC/W33 is a double-row spherical roller bearing with 200 mm bore, 310 mm outer diameter and 109 mm width (7.874 × 12.205 × 4.291 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1353 kN, C0 2120 kN, fatigue load limit Pu 186 kN, reference speed 1,300 r/min, limiting speed 1,900 r/min, mass about 31000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 24040 bore code work?", "a": "The last two digits of 24040 are bore code 40, so 40 × 5 = 200 mm bore. The 310 mm OD and 109 mm width come from the ISO 15 dimension-series plan (dimension series 40 (compact OD, maximum width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 24040?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper." }, { "q": "Can 24040 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 24040K30 variant be used instead?", "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24040 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "24040", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "24040-CCK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) execution on AH24040 withdrawal sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C4040-V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 4040 V shares the 200×310×109 mm envelope but catalogue C/C0 differ (1630/2650 kN vs 1353/2120 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24040", "24040 CC/W33" ], "locale_variants": {} }, { "sku": "24044", "brand": "SKF", "manufacturer_designation": "SKF 24044 CC/W33", "series": "24000-series", "type": "spherical_roller", "d_mm": 220, "D_mm": 340, "B_mm": 118, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1628, "static_load_kN": 2600, "fatigue_load_limit_kN": 212, "max_rpm": 1700, "reference_speed_rpm": 1200, "limiting_speed_rpm": 1700, "weight_g": 40000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "24044 CC/W33 belongs to the SKF spherical roller range — the 220 mm bore entry in the 24000-series series (dimension series 40 (compact OD, maximum width)), dimensioned 340 mm OD and 118 mm wide. Reading the designation: the leading 2 marks a spherical roller bearing, the 40 is the ISO 15 dimension series (dimension series 40 (compact OD, maximum width)), and the last two digits encode the 220 mm bore; the 340 mm OD and 118 mm width follow the ISO 15 general plan. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. The 60.0 mm radial section height ((340−220)/2) and 40000 g catalogue mass frame a 220 mm bore bearing rated at 1628 kN C — roughly 7.40 kN of dynamic capacity per millimetre of bore before application factors. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.", "applications": [ "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "steel-plant continuous-caster segments" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems" ], "pitfalls": [ "At 220 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24000-series series at 220 mm bore (340×118 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.", "Never use the tapered-bore CCK30/K30 variant's drive-up figures on this cylindrical-bore 24044; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 24044 pits long before its L10 life.", "The 1628/2600 kN ratings are SKF catalogue values for this exact execution (24044 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 24044 (cylindrical bore as listed, tapered-bore 24044 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24044 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24044?", "a": "The 24044 CC/W33 is a double-row spherical roller bearing with 220 mm bore, 340 mm outer diameter and 118 mm width (8.661 × 13.386 × 4.646 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1628 kN, C0 2600 kN, fatigue load limit Pu 212 kN, reference speed 1,200 r/min, limiting speed 1,700 r/min, mass about 40000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 24044 bore code work?", "a": "The last two digits of 24044 are bore code 44, so 44 × 5 = 220 mm bore. The 340 mm OD and 118 mm width come from the ISO 15 dimension-series plan (dimension series 40 (compact OD, maximum width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 24044?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper." }, { "q": "Can 24044 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 24044K30 variant be used instead?", "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24044 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "24044", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "24044-CCK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) execution on AOH24044 withdrawal sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C4044-V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 4044 V shares the 220×340×118 mm envelope but catalogue C/C0 differ (1930/3250 kN vs 1628/2600 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C4044-K30V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 4044 K30V shares the 220×340×118 mm envelope but catalogue C/C0 differ (1930/3250 kN vs 1628/2600 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24044", "24044 CC/W33" ], "locale_variants": {} }, { "sku": "24048", "brand": "SKF", "manufacturer_designation": "SKF 24048 CC/W33", "series": "24000-series", "type": "spherical_roller", "d_mm": 240, "D_mm": 360, "B_mm": 118, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1663, "static_load_kN": 2700, "fatigue_load_limit_kN": 228, "max_rpm": 1600, "reference_speed_rpm": 1100, "limiting_speed_rpm": 1600, "weight_g": 43000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "24048 is a double-row spherical roller bearing in the 24000-series family: two rows of barrel rollers on a common sphered outer raceway, self-aligning under shaft deflection, listed by SKF in SKF catalogue PUB BU/P1 17000. The code breaks down as type digit 2 (double-row spherical roller), dimension series 40 (dimension series 40 (compact OD, maximum width)), and bore code 48 = 240 mm; dimensions 240×360×118 mm therefore match the ISO 15 envelope. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. With C 1663 kN and C0 2700 kN, the 24048 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 24048 CCK30/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.", "applications": [ "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "steel-plant continuous-caster segments", "large induced-draft fan rotors" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems" ], "pitfalls": [ "At 240 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24000-series series at 240 mm bore (360×118 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.", "The 24048 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 1663/2700 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "Never use the tapered-bore CCK30/K30 variant's drive-up figures on this cylindrical-bore 24048; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 1663/2700 kN ratings are SKF catalogue values for this exact execution (24048 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 24048 (cylindrical bore as listed, tapered-bore 24048 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24048 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24048?", "a": "The 24048 CC/W33 is a double-row spherical roller bearing with 240 mm bore, 360 mm outer diameter and 118 mm width (9.449 × 14.173 × 4.646 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1663 kN, C0 2700 kN, fatigue load limit Pu 228 kN, reference speed 1,100 r/min, limiting speed 1,600 r/min, mass about 43000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 24048 bore code work?", "a": "The last two digits of 24048 are bore code 48, so 48 × 5 = 240 mm bore. The 360 mm OD and 118 mm width come from the ISO 15 dimension-series plan (dimension series 40 (compact OD, maximum width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 24048?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper." }, { "q": "Can 24048 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 24048K30 variant be used instead?", "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24048 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "24048", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "24048-CCK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) execution on AOH24048 withdrawal sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24048", "24048 CC/W33" ], "locale_variants": {} }, { "sku": "24052", "brand": "SKF", "manufacturer_designation": "SKF 24052 CC/W33", "series": "24000-series", "type": "spherical_roller", "d_mm": 260, "D_mm": 400, "B_mm": 140, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2135, "static_load_kN": 3450, "fatigue_load_limit_kN": 285, "max_rpm": 1400, "reference_speed_rpm": 1000, "limiting_speed_rpm": 1400, "weight_g": 65500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 260 mm shaft carrying heavy radial load with misalignment or deflection, SKF lists 24052 under catalogue execution 24052 CC/W33: two barrel-roller rows on a sphered outer raceway. Reading the designation: the leading 2 marks a spherical roller bearing, the 40 is the ISO 15 dimension series (dimension series 40 (compact OD, maximum width)), and the last two digits encode the 260 mm bore; the 400 mm OD and 140 mm width follow the ISO 15 general plan. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. At 1,000 r/min reference speed the 70.0 mm-section 24052 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 1,400 r/min as the mechanical ceiling. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 24052 CCK30/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.", "applications": [ "large induced-draft fan rotors", "SAG and ball-mill drive shafts", "large mining crusher main shafts", "wind-turbine main shaft support" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still" ], "pitfalls": [ "At 260 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24000-series series at 260 mm bore (400×140 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.", "Never use the tapered-bore CCK30/K30 variant's drive-up figures on this cylindrical-bore 24052; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "Catalogue reference speed and limiting speed are different limits: the 1,000 r/min reference is a thermal criterion under load, while the 1,400 r/min limiting value is the mechanical ceiling — observe both.", "The 2135/3450 kN ratings are SKF catalogue values for this exact execution (24052 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 24052 (cylindrical bore as listed, tapered-bore 24052 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24052 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24052?", "a": "The 24052 CC/W33 is a double-row spherical roller bearing with 260 mm bore, 400 mm outer diameter and 140 mm width (10.236 × 15.748 × 5.512 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 2135 kN, C0 3450 kN, fatigue load limit Pu 285 kN, reference speed 1,000 r/min, limiting speed 1,400 r/min, mass about 65500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 24052 bore code work?", "a": "The last two digits of 24052 are bore code 52, so 52 × 5 = 260 mm bore. The 400 mm OD and 140 mm width come from the ISO 15 dimension-series plan (dimension series 40 (compact OD, maximum width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 24052?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper." }, { "q": "Can 24052 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 24052K30 variant be used instead?", "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24052 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "24052", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "24052-CCK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) execution on AOH24052 withdrawal sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24052", "24052 CC/W33" ], "locale_variants": {} }, { "sku": "24056", "brand": "SKF", "manufacturer_designation": "SKF 24056 CC/W33", "series": "24000-series", "type": "spherical_roller", "d_mm": 280, "D_mm": 420, "B_mm": 140, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2248, "static_load_kN": 3800, "fatigue_load_limit_kN": 285, "max_rpm": 1400, "reference_speed_rpm": 950, "limiting_speed_rpm": 1400, "weight_g": 69500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 24056 CC/W33 is a 280×420×140 mm spherical roller bearing — the dimension series 40 (compact OD, maximum width) entry for a 280 mm shaft, with two rows of symmetrical barrel rollers for combined radial and axial load. The code breaks down as type digit 2 (double-row spherical roller), dimension series 40 (dimension series 40 (compact OD, maximum width)), and bore code 56 = 280 mm; dimensions 280×420×140 mm therefore match the ISO 15 envelope. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. Selection arithmetic: the C0/C ratio is about 1.69 (static 3800 kN against dynamic 2248 kN), typical of a spherical roller sized for heavy combined loads, and the 285 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Drive-on force must go through the ring being fitted: press or induction-heat the inner ring onto the 280 mm shaft (max 120 °C) and never transmit mounting force through the roller complement, or the raceways brinell.", "applications": [ "SAG and ball-mill drive shafts", "large mining crusher main shafts", "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still" ], "pitfalls": [ "At 280 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24000-series series at 280 mm bore (420×140 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.", "The 24056 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 2248/3800 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The 69500 g mass and 140 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 24056.", "The 2248/3800 kN ratings are SKF catalogue values for this exact execution (24056 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 24056 (cylindrical bore as listed, tapered-bore 24056 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24056 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24056?", "a": "The 24056 CC/W33 is a double-row spherical roller bearing with 280 mm bore, 420 mm outer diameter and 140 mm width (11.024 × 16.535 × 5.512 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 2248 kN, C0 3800 kN, fatigue load limit Pu 285 kN, reference speed 950 r/min, limiting speed 1,400 r/min, mass about 69500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 24056 bore code work?", "a": "The last two digits of 24056 are bore code 56, so 56 × 5 = 280 mm bore. The 420 mm OD and 140 mm width come from the ISO 15 dimension-series plan (dimension series 40 (compact OD, maximum width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 24056?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper." }, { "q": "Can 24056 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 24056K30 variant be used instead?", "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24056 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "24056", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "24056-CCK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) execution on AOH24056 withdrawal sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24056", "24056 CC/W33" ], "locale_variants": {} }, { "sku": "24060", "brand": "SKF", "manufacturer_designation": "SKF 24060 CC/W33", "series": "24000-series", "type": "spherical_roller", "d_mm": 300, "D_mm": 460, "B_mm": 160, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2821, "static_load_kN": 4750, "fatigue_load_limit_kN": 355, "max_rpm": 1200, "reference_speed_rpm": 850, "limiting_speed_rpm": 1200, "weight_g": 97000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF 24060 (24060 CC/W33) is the spherical-roller choice for a 300 mm shaft — barrel rollers between an inner ring with two raceways and a common sphered outer raceway inside the 460×160 mm ISO 15 envelope. Reading the designation: the leading 2 marks a spherical roller bearing, the 40 is the ISO 15 dimension series (dimension series 40 (compact OD, maximum width)), and the last two digits encode the 300 mm bore; the 460 mm OD and 160 mm width follow the ISO 15 general plan. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. With C 2821 kN and C0 4750 kN, the 24060 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. Drive-on force must go through the ring being fitted: press or induction-heat the inner ring onto the 300 mm shaft (max 120 °C) and never transmit mounting force through the roller complement, or the raceways brinell.", "applications": [ "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "steel-plant continuous-caster segments", "large induced-draft fan rotors" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 300 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24000-series series at 300 mm bore (460×160 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.", "Never use the tapered-bore CCK30/K30 variant's drive-up figures on this cylindrical-bore 24060; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 2821/4750 kN ratings are SKF catalogue values for this exact execution (24060 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 24060 (cylindrical bore as listed, tapered-bore 24060 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24060 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24060?", "a": "The 24060 CC/W33 is a double-row spherical roller bearing with 300 mm bore, 460 mm outer diameter and 160 mm width (11.811 × 18.11 × 6.299 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 2821 kN, C0 4750 kN, fatigue load limit Pu 355 kN, reference speed 850 r/min, limiting speed 1,200 r/min, mass about 97000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 24060 bore code work?", "a": "The last two digits of 24060 are bore code 60, so 60 × 5 = 300 mm bore. The 460 mm OD and 160 mm width come from the ISO 15 dimension-series plan (dimension series 40 (compact OD, maximum width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 24060?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper." }, { "q": "Can 24060 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 24060K30 variant be used instead?", "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24060 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "24060", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "24060-CCK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) execution on AOH24060 withdrawal sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C4060-M", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 4060 M shares the 300×460×160 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C4060-K30M", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 4060 K30M shares the 300×460×160 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24060", "24060 CC/W33" ], "locale_variants": {} }, { "sku": "24064", "brand": "SKF", "manufacturer_designation": "SKF 24064 CC/W33", "series": "24000-series", "type": "spherical_roller", "d_mm": 320, "D_mm": 480, "B_mm": 160, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2969, "static_load_kN": 5100, "fatigue_load_limit_kN": 400, "max_rpm": 1200, "reference_speed_rpm": 800, "limiting_speed_rpm": 1200, "weight_g": 100000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 24064 appears as 24064 CC/W33: an open, double-row spherical roller bearing, self-aligning by virtue of the sphered outer raceway, sized 320×480×160 mm to the ISO 15 boundary plan. The code breaks down as type digit 2 (double-row spherical roller), dimension series 40 (dimension series 40 (compact OD, maximum width)), and bore code 64 = 320 mm; dimensions 320×480×160 mm therefore match the ISO 15 envelope. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. Catalogue mass 100000 g for the 320×480×160 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. Mount with the spherical bearing's self-alignment in mind: it compensates ≈ 0.5–2.5° of misalignment depending on series, but the shaft and housing seats still set the datum — a rotating inner ring on a 320 mm shaft typically takes a m6 seat with an H7 housing bore.", "applications": [ "large dredger and marine winch drums", "steel-plant continuous-caster segments", "large induced-draft fan rotors", "SAG and ball-mill drive shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 320 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24000-series series at 320 mm bore (480×160 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.", "The 24064 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 2969/5100 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "Shaft and housing fillets must clear the bearing chamfer so the 160 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 2969/5100 kN ratings are SKF catalogue values for this exact execution (24064 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 24064 (cylindrical bore as listed, tapered-bore 24064 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24064 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24064?", "a": "The 24064 CC/W33 is a double-row spherical roller bearing with 320 mm bore, 480 mm outer diameter and 160 mm width (12.598 × 18.898 × 6.299 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 2969 kN, C0 5100 kN, fatigue load limit Pu 400 kN, reference speed 800 r/min, limiting speed 1,200 r/min, mass about 100000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 24064 bore code work?", "a": "The last two digits of 24064 are bore code 64, so 64 × 5 = 320 mm bore. The 480 mm OD and 160 mm width come from the ISO 15 dimension-series plan (dimension series 40 (compact OD, maximum width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 24064?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper." }, { "q": "Can 24064 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 24064K30 variant be used instead?", "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24064 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "24064", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "24064-CCK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) execution on AOH24064 withdrawal sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24064", "24064 CC/W33" ], "locale_variants": {} }, { "sku": "24068", "brand": "SKF", "manufacturer_designation": "SKF 24068 CC/W33", "series": "24000-series", "type": "spherical_roller", "d_mm": 340, "D_mm": 520, "B_mm": 180, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 3621, "static_load_kN": 6200, "fatigue_load_limit_kN": 475, "max_rpm": 1100, "reference_speed_rpm": 750, "limiting_speed_rpm": 1100, "weight_g": 140000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number 24068 CC/W33 in SKF catalogue PUB BU/P1 17000 denotes a double-row spherical roller bearing for a 340 mm shaft, dimension series 40 (compact OD, maximum width), with open execution and two pressed-steel cages with a floating guide ring. On the SKF nameplate, 24068 follows the ISO 15 convention: 2 for the spherical roller type, 40 for the dimension series 40 (compact OD, maximum width), final digits 68 for the 340 mm bore. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. The 475 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.71 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. A 340 mm rotating inner ring usually runs m6 on the shaft with H7 in the housing; for vibrating-screen duty the outer ring is instead held tight and the shaft seat loosened — follow the screen builder's fit schedule.", "applications": [ "steel-plant continuous-caster segments", "large induced-draft fan rotors", "SAG and ball-mill drive shafts", "large mining crusher main shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 340 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24000-series series at 340 mm bore (520×180 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "Catalogue reference speed and limiting speed are different limits: the 750 r/min reference is a thermal criterion under load, while the 1,100 r/min limiting value is the mechanical ceiling — observe both.", "The 3621/6200 kN ratings are SKF catalogue values for this exact execution (24068 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 24068 (cylindrical bore as listed, tapered-bore 24068 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24068 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24068?", "a": "The 24068 CC/W33 is a double-row spherical roller bearing with 340 mm bore, 520 mm outer diameter and 180 mm width (13.386 × 20.472 × 7.087 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 3621 kN, C0 6200 kN, fatigue load limit Pu 475 kN, reference speed 750 r/min, limiting speed 1,100 r/min, mass about 140000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 24068 bore code work?", "a": "The last two digits of 24068 are bore code 68, so 68 × 5 = 340 mm bore. The 520 mm OD and 180 mm width come from the ISO 15 dimension-series plan (dimension series 40 (compact OD, maximum width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 24068?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper." }, { "q": "Can 24068 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 24068K30 variant be used instead?", "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24068 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "24068", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "24068-CCK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) execution on AOH24068 withdrawal sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24068", "24068 CC/W33" ], "locale_variants": {} }, { "sku": "24072", "brand": "SKF", "manufacturer_designation": "SKF 24072 CC/W33", "series": "24000-series", "type": "spherical_roller", "d_mm": 360, "D_mm": 540, "B_mm": 180, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 3705, "static_load_kN": 6550, "fatigue_load_limit_kN": 490, "max_rpm": 1000, "reference_speed_rpm": 700, "limiting_speed_rpm": 1000, "weight_g": 145000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "24072 CC/W33 belongs to the SKF spherical roller range — the 360 mm bore entry in the 24000-series series (dimension series 40 (compact OD, maximum width)), dimensioned 540 mm OD and 180 mm wide. The code breaks down as type digit 2 (double-row spherical roller), dimension series 40 (dimension series 40 (compact OD, maximum width)), and bore code 72 = 360 mm; dimensions 360×540×180 mm therefore match the ISO 15 envelope. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. Speed planning uses two different ceilings: 700 r/min thermal reference and 1,000 r/min mechanical limiting speed. A 360 mm rotating inner ring usually runs m6 on the shaft with H7 in the housing; for vibrating-screen duty the outer ring is instead held tight and the shaft seat loosened — follow the screen builder's fit schedule.", "applications": [ "large mining crusher main shafts", "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "At 360 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24000-series series at 360 mm bore (540×180 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.", "The 24072 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 3705/6550 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The 24072 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 3705/6550 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The 3705/6550 kN ratings are SKF catalogue values for this exact execution (24072 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 24072 (cylindrical bore as listed, tapered-bore 24072 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24072 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24072?", "a": "The 24072 CC/W33 is a double-row spherical roller bearing with 360 mm bore, 540 mm outer diameter and 180 mm width (14.173 × 21.26 × 7.087 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 3705 kN, C0 6550 kN, fatigue load limit Pu 490 kN, reference speed 700 r/min, limiting speed 1,000 r/min, mass about 145000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 24072 bore code work?", "a": "The last two digits of 24072 are bore code 72, so 72 × 5 = 360 mm bore. The 540 mm OD and 180 mm width come from the ISO 15 dimension-series plan (dimension series 40 (compact OD, maximum width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 24072?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper." }, { "q": "Can 24072 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 24072K30 variant be used instead?", "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24072 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "24072", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "24072-CCK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) execution on AOH24072 withdrawal sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24072", "24072 CC/W33" ], "locale_variants": {} }, { "sku": "24076", "brand": "SKF", "manufacturer_designation": "SKF 24076 CC/W33", "series": "24000-series", "type": "spherical_roller", "d_mm": 380, "D_mm": 560, "B_mm": 180, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 3786, "static_load_kN": 6800, "fatigue_load_limit_kN": 475, "max_rpm": 950, "reference_speed_rpm": 670, "limiting_speed_rpm": 950, "weight_g": 150000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "24076 is a double-row spherical roller bearing in the 24000-series family: two rows of barrel rollers on a common sphered outer raceway, self-aligning under shaft deflection, listed by SKF in SKF catalogue PUB BU/P1 17000. On the SKF nameplate, 24076 follows the ISO 15 convention: 2 for the spherical roller type, 40 for the dimension series 40 (compact OD, maximum width), final digits 76 for the 380 mm bore. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. The 90.0 mm radial section height ((560−380)/2) and 150000 g catalogue mass frame a 380 mm bore bearing rated at 3786 kN C — roughly 9.96 kN of dynamic capacity per millimetre of bore before application factors. For relubrication, route the grease duct to the outer-ring W33 groove position where fitted, and purge until fresh grease appears at the seal — the 180 mm width across two roller rows needs the full charge.", "applications": [ "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "steel-plant continuous-caster segments" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "At 380 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24000-series series at 380 mm bore (560×180 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 3786/6800 kN ratings are SKF catalogue values for this exact execution (24076 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 24076 (cylindrical bore as listed, tapered-bore 24076 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24076 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24076?", "a": "The 24076 CC/W33 is a double-row spherical roller bearing with 380 mm bore, 560 mm outer diameter and 180 mm width (14.961 × 22.047 × 7.087 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 3786 kN, C0 6800 kN, fatigue load limit Pu 475 kN, reference speed 670 r/min, limiting speed 950 r/min, mass about 150000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 24076 bore code work?", "a": "The last two digits of 24076 are bore code 76, so 76 × 5 = 380 mm bore. The 560 mm OD and 180 mm width come from the ISO 15 dimension-series plan (dimension series 40 (compact OD, maximum width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 24076?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper." }, { "q": "Can 24076 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 24076K30 variant be used instead?", "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24076 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "24076", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "24076-CCK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) execution on AOH24076 withdrawal sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24076", "24076 CC/W33" ], "locale_variants": {} }, { "sku": "24080", "brand": "SKF", "manufacturer_designation": "SKF 24080 ECCJ/W33", "series": "24000-series", "type": "spherical_roller", "d_mm": 400, "D_mm": 600, "B_mm": 200, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4507, "static_load_kN": 8000, "fatigue_load_limit_kN": 560, "max_rpm": 900, "reference_speed_rpm": 630, "limiting_speed_rpm": 900, "weight_g": 205000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 400 mm shaft carrying heavy radial load with misalignment or deflection, SKF lists 24080 under catalogue execution 24080 ECCJ/W33: two barrel-roller rows on a sphered outer raceway. The code breaks down as type digit 2 (double-row spherical roller), dimension series 40 (dimension series 40 (compact OD, maximum width)), and bore code 80 = 400 mm; dimensions 400×600×200 mm therefore match the ISO 15 envelope. CJ/ECCJ bearings here run a stamped steel window cage rather than the older two-cage CC arrangement; quote the full ECCJ/W33 designation when ordering, and do not assume the K tapered-bore execution is a field conversion. The 560 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.78 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. For relubrication, route the grease duct to the outer-ring W33 groove position where fitted, and purge until fresh grease appears at the seal — the 200 mm width across two roller rows needs the full charge.", "applications": [ "steel-plant continuous-caster segments", "large induced-draft fan rotors", "SAG and ball-mill drive shafts", "large mining crusher main shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems" ], "pitfalls": [ "At 400 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24000-series series at 400 mm bore (600×200 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.", "The 24080 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 4507/8000 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 24080 pits long before its L10 life.", "The 4507/8000 kN ratings are SKF catalogue values for this exact execution (24080 ECCJ/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 24080 (cylindrical bore as listed, tapered-bore 24080 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24080 ECCJ/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24080?", "a": "The 24080 ECCJ/W33 is a double-row spherical roller bearing with 400 mm bore, 600 mm outer diameter and 200 mm width (15.748 × 23.622 × 7.874 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 4507 kN, C0 8000 kN, fatigue load limit Pu 560 kN, reference speed 630 r/min, limiting speed 900 r/min, mass about 205000 g. It is an open, self-aligning bearing with a stamped sheet-steel window-type cage with low-friction guidance (CJ design)." }, { "q": "How does the 24080 bore code work?", "a": "The last two digits of 24080 are bore code 80, so 80 × 5 = 400 mm bore. The 600 mm OD and 200 mm width come from the ISO 15 dimension-series plan (dimension series 40 (compact OD, maximum width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the ECCJ/W33 suffix mean on 24080?", "a": "The suffix ECCJ/W33 reads ECCJ — the optimized, higher-capacity version of the CJ design, with a stamped sheet-steel window-type cage with low-friction guidance, plus W33 (outer-ring groove and three lubrication holes); CCK30/W33 is the 1:30 tapered-bore counterpart." }, { "q": "Can 24080 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 24080K30 variant be used instead?", "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24080 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "24080", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "24080-ECCK30J-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) execution on AOH24080 withdrawal sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24080", "24080 ECCJ/W33" ], "locale_variants": {} }, { "sku": "24084", "brand": "SKF", "manufacturer_designation": "SKF 24084 ECA/W33", "series": "24000-series", "type": "spherical_roller", "d_mm": 420, "D_mm": 620, "B_mm": 200, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass_machined_M1", "dynamic_load_kN": 4610, "static_load_kN": 8300, "fatigue_load_limit_kN": 585, "max_rpm": 900, "reference_speed_rpm": 530, "limiting_speed_rpm": 900, "weight_g": 210000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 24084 ECA/W33 is a 420×620×200 mm spherical roller bearing — the dimension series 40 (compact OD, maximum width) entry for a 420 mm shaft, with two rows of symmetrical barrel rollers for combined radial and axial load. On the SKF nameplate, 24084 follows the ISO 15 convention: 2 for the spherical roller type, 40 for the dimension series 40 (compact OD, maximum width), final digits 84 for the 420 mm bore. CA executions here use a machined brass cage (ECA enhanced geometry) rather than pressed steel; specialist suffixes change the bearing materially and must be quoted in full, and the K/CCK tapered-bore variant is a separate order number. At 530 r/min reference speed the 100.0 mm-section 24084 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 900 r/min as the mechanical ceiling. After mounting, swing the outer ring to confirm free self-alignment: the 24084 should tilt through its full catalogue misalignment range without binding; a stiff joint signals a cocked seat or shoulder interference.", "applications": [ "large induced-draft fan rotors", "SAG and ball-mill drive shafts", "large mining crusher main shafts", "wind-turbine main shaft support" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems" ], "pitfalls": [ "At 420 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24000-series series at 420 mm bore (620×200 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "Never use the tapered-bore CCK30/K30 variant's drive-up figures on this cylindrical-bore 24084; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 4610/8300 kN ratings are SKF catalogue values for this exact execution (24084 ECA/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 24084 (cylindrical bore as listed, tapered-bore 24084 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24084 ECA/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24084?", "a": "The 24084 ECA/W33 is a double-row spherical roller bearing with 420 mm bore, 620 mm outer diameter and 200 mm width (16.535 × 24.409 × 7.874 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 4610 kN, C0 8300 kN, fatigue load limit Pu 585 kN, reference speed 530 r/min, limiting speed 900 r/min, mass about 210000 g. It is an open, self-aligning bearing with a one-piece machined brass cage guided on the inner ring (CA design)." }, { "q": "How does the 24084 bore code work?", "a": "The last two digits of 24084 are bore code 84, so 84 × 5 = 420 mm bore. The 620 mm OD and 200 mm width come from the ISO 15 dimension-series plan (dimension series 40 (compact OD, maximum width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the ECA/W33 suffix mean on 24084?", "a": "The suffix ECA/W33 reads ECA — the enhanced version of the CA design with optimized internal geometry, plus W33 (annular groove and three lubrication holes in the outer ring for relubrication); CCK30/W33 is the 1:30 tapered-bore counterpart." }, { "q": "Can 24084 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 24084K30 variant be used instead?", "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24084 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "24084", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "24084-ECAK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) execution on AOH24084 withdrawal sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24084", "24084 ECA/W33" ], "locale_variants": {} }, { "sku": "24088", "brand": "SKF", "manufacturer_designation": "SKF 24088 ECA/W33", "series": "24000-series", "type": "spherical_roller", "d_mm": 440, "D_mm": 650, "B_mm": 212, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass_machined_M1", "dynamic_load_kN": 4987, "static_load_kN": 9150, "fatigue_load_limit_kN": 630, "max_rpm": 850, "reference_speed_rpm": 500, "limiting_speed_rpm": 850, "weight_g": 245000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF 24088 (24088 ECA/W33) is the spherical-roller choice for a 440 mm shaft — barrel rollers between an inner ring with two raceways and a common sphered outer raceway inside the 650×212 mm ISO 15 envelope. Numbering ties the bearing to its envelope: 24088 means spherical-roller type, dimension series 40, 440 mm bore — which is why the 650×212 mm outline swaps dimensionally with other ISO 15 bearings of the same code. CA executions here use a machined brass cage (ECA enhanced geometry) rather than pressed steel; specialist suffixes change the bearing materially and must be quoted in full, and the K/CCK tapered-bore variant is a separate order number. Selection arithmetic: the C0/C ratio is about 1.83 (static 9150 kN against dynamic 4987 kN), typical of a spherical roller sized for heavy combined loads, and the 630 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.", "applications": [ "SAG and ball-mill drive shafts", "large mining crusher main shafts", "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems" ], "pitfalls": [ "At 440 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24000-series series at 440 mm bore (650×212 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.", "Shaft and housing fillets must clear the bearing chamfer so the 212 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 24088 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 4987/9150 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The 4987/9150 kN ratings are SKF catalogue values for this exact execution (24088 ECA/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 24088 (cylindrical bore as listed, tapered-bore 24088 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24088 ECA/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24088?", "a": "The 24088 ECA/W33 is a double-row spherical roller bearing with 440 mm bore, 650 mm outer diameter and 212 mm width (17.323 × 25.591 × 8.346 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 4987 kN, C0 9150 kN, fatigue load limit Pu 630 kN, reference speed 500 r/min, limiting speed 850 r/min, mass about 245000 g. It is an open, self-aligning bearing with a one-piece machined brass cage guided on the inner ring (CA design)." }, { "q": "How does the 24088 bore code work?", "a": "The last two digits of 24088 are bore code 88, so 88 × 5 = 440 mm bore. The 650 mm OD and 212 mm width come from the ISO 15 dimension-series plan (dimension series 40 (compact OD, maximum width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the ECA/W33 suffix mean on 24088?", "a": "The suffix ECA/W33 reads ECA — the enhanced version of the CA design with optimized internal geometry, plus W33 (annular groove and three lubrication holes in the outer ring for relubrication); CCK30/W33 is the 1:30 tapered-bore counterpart." }, { "q": "Can 24088 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 24088K30 variant be used instead?", "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24088 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "24088", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "24088-ECAK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) execution on AOH24088 withdrawal sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24088", "24088 ECA/W33" ], "locale_variants": {} }, { "sku": "24092", "brand": "SKF", "manufacturer_designation": "SKF 24092 ECA/W33", "series": "24000-series", "type": "spherical_roller", "d_mm": 460, "D_mm": 680, "B_mm": 218, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass_machined_M1", "dynamic_load_kN": 5401, "static_load_kN": 10000, "fatigue_load_limit_kN": 670, "max_rpm": 800, "reference_speed_rpm": 480, "limiting_speed_rpm": 800, "weight_g": 275000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 24092 appears as 24092 ECA/W33: an open, double-row spherical roller bearing, self-aligning by virtue of the sphered outer raceway, sized 460×680×218 mm to the ISO 15 boundary plan. On the SKF nameplate, 24092 follows the ISO 15 convention: 2 for the spherical roller type, 40 for the dimension series 40 (compact OD, maximum width), final digits 92 for the 460 mm bore. CA executions here use a machined brass cage (ECA enhanced geometry) rather than pressed steel; specialist suffixes change the bearing materially and must be quoted in full, and the K/CCK tapered-bore variant is a separate order number. With C 5401 kN and C0 10000 kN, the 24092 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.", "applications": [ "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "steel-plant continuous-caster segments", "large induced-draft fan rotors" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still" ], "pitfalls": [ "At 460 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24000-series series at 460 mm bore (680×218 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 275000 g mass and 218 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 24092.", "The 5401/10000 kN ratings are SKF catalogue values for this exact execution (24092 ECA/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 24092 (cylindrical bore as listed, tapered-bore 24092 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24092 ECA/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24092?", "a": "The 24092 ECA/W33 is a double-row spherical roller bearing with 460 mm bore, 680 mm outer diameter and 218 mm width (18.11 × 26.772 × 8.583 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 5401 kN, C0 10000 kN, fatigue load limit Pu 670 kN, reference speed 480 r/min, limiting speed 800 r/min, mass about 275000 g. It is an open, self-aligning bearing with a one-piece machined brass cage guided on the inner ring (CA design)." }, { "q": "How does the 24092 bore code work?", "a": "The last two digits of 24092 are bore code 92, so 92 × 5 = 460 mm bore. The 680 mm OD and 218 mm width come from the ISO 15 dimension-series plan (dimension series 40 (compact OD, maximum width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the ECA/W33 suffix mean on 24092?", "a": "The suffix ECA/W33 reads ECA — the enhanced version of the CA design with optimized internal geometry, plus W33 (annular groove and three lubrication holes in the outer ring for relubrication); CCK30/W33 is the 1:30 tapered-bore counterpart." }, { "q": "Can 24092 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 24092K30 variant be used instead?", "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24092 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "24092", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "24092-ECAK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) execution on AOH24092 withdrawal sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24092", "24092 ECA/W33" ], "locale_variants": {} }, { "sku": "24096", "brand": "SKF", "manufacturer_designation": "SKF 24096 ECA/W33", "series": "24000-series", "type": "spherical_roller", "d_mm": 480, "D_mm": 700, "B_mm": 218, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass_machined_M1", "dynamic_load_kN": 5524, "static_load_kN": 10400, "fatigue_load_limit_kN": 695, "max_rpm": 750, "reference_speed_rpm": 450, "limiting_speed_rpm": 750, "weight_g": 285000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number 24096 ECA/W33 in SKF catalogue PUB BU/P1 17000 denotes a double-row spherical roller bearing for a 480 mm shaft, dimension series 40 (compact OD, maximum width), with open execution and a one-piece machined brass cage guided on the inner ring (CA design). Numbering ties the bearing to its envelope: 24096 means spherical-roller type, dimension series 40, 480 mm bore — which is why the 700×218 mm outline swaps dimensionally with other ISO 15 bearings of the same code. CA executions here use a machined brass cage (ECA enhanced geometry) rather than pressed steel; specialist suffixes change the bearing materially and must be quoted in full, and the K/CCK tapered-bore variant is a separate order number. Catalogue mass 285000 g for the 480×700×218 mm open execution covers the a one-piece machined brass cage guided on the inner ring (CA design); tapered-bore and sealed variants differ in mass and carry their own order numbers. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 24096 CCK30/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.", "applications": [ "large dredger and marine winch drums", "steel-plant continuous-caster segments", "large induced-draft fan rotors", "SAG and ball-mill drive shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still" ], "pitfalls": [ "At 480 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24000-series series at 480 mm bore (700×218 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.", "Shaft and housing fillets must clear the bearing chamfer so the 218 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 24096 pits long before its L10 life.", "The 5524/10400 kN ratings are SKF catalogue values for this exact execution (24096 ECA/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 24096 (cylindrical bore as listed, tapered-bore 24096 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24096 ECA/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24096?", "a": "The 24096 ECA/W33 is a double-row spherical roller bearing with 480 mm bore, 700 mm outer diameter and 218 mm width (18.898 × 27.559 × 8.583 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 5524 kN, C0 10400 kN, fatigue load limit Pu 695 kN, reference speed 450 r/min, limiting speed 750 r/min, mass about 285000 g. It is an open, self-aligning bearing with a one-piece machined brass cage guided on the inner ring (CA design)." }, { "q": "How does the 24096 bore code work?", "a": "The last two digits of 24096 are bore code 96, so 96 × 5 = 480 mm bore. The 700 mm OD and 218 mm width come from the ISO 15 dimension-series plan (dimension series 40 (compact OD, maximum width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the ECA/W33 suffix mean on 24096?", "a": "The suffix ECA/W33 reads ECA — the enhanced version of the CA design with optimized internal geometry, plus W33 (annular groove and three lubrication holes in the outer ring for relubrication); CCK30/W33 is the 1:30 tapered-bore counterpart." }, { "q": "Can 24096 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 24096K30 variant be used instead?", "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24096 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "24096", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "24096-ECAK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) execution on AOH24096 withdrawal sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24096", "24096 ECA/W33" ], "locale_variants": {} }, { "sku": "24120", "brand": "SKF", "manufacturer_designation": "SKF 24120 CC/W33", "series": "24100-series", "type": "spherical_roller", "d_mm": 100, "D_mm": 165, "B_mm": 65, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 468, "static_load_kN": 640, "fatigue_load_limit_kN": 68, "max_rpm": 3200, "reference_speed_rpm": 2400, "limiting_speed_rpm": 3200, "weight_g": 5650, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 24120 appears as 24120 CC/W33: an open, double-row spherical roller bearing, self-aligning by virtue of the sphered outer raceway, sized 100×165×65 mm to the ISO 15 boundary plan. Digit by digit, 24120 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 41, and bore reference 20 resolving to 100 mm; 165 mm OD and 65 mm width are the matching ISO 15 boundary values. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. The 68 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.37 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. Mount with the spherical bearing's self-alignment in mind: it compensates ≈ 0.5–2.5° of misalignment depending on series, but the shaft and housing seats still set the datum — a rotating inner ring on a 100 mm shaft typically takes a k5 seat with an H7 housing bore.", "applications": [ "cement-mill trunnion and drive shafts", "heavy conveyor head shafts in mining", "jaw and cone crusher main shafts", "paper-machine press and dryer rolls" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still" ], "pitfalls": [ "Mount the 100 mm bore 24120 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 24100-series series at 100 mm bore (165×65 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 3,200 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 24120 pits long before its L10 life.", "Shaft and housing fillets must clear the bearing chamfer so the 65 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 468/640 kN ratings are SKF catalogue values for this exact execution (24120 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 24120 (cylindrical bore as listed, tapered-bore 24120 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24120 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24120?", "a": "The 24120 CC/W33 is a double-row spherical roller bearing with 100 mm bore, 165 mm outer diameter and 65 mm width (3.937 × 6.496 × 2.559 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 468 kN, C0 640 kN, fatigue load limit Pu 68 kN, reference speed 2,400 r/min, limiting speed 3,200 r/min, mass about 5650 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 24120 bore code work?", "a": "The last two digits of 24120 are bore code 20, so 20 × 5 = 100 mm bore. The 165 mm OD and 65 mm width come from the ISO 15 dimension-series plan (dimension series 41 (medium OD, maximum width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 24120?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper." }, { "q": "Can 24120 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 24120K30 variant be used instead?", "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24120 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "24120", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "C4120-2CS5V-GEM9", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 4120-2CS5V/GEM9 shares the 100×165×65 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C4120-V-VE240", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 4120 V/VE240 shares the 100×165×65 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24120", "24120 CC/W33" ], "locale_variants": {} }, { "sku": "24122", "brand": "SKF", "manufacturer_designation": "SKF 24122 CC/W33", "series": "24100-series", "type": "spherical_roller", "d_mm": 110, "D_mm": 180, "B_mm": 69, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 539, "static_load_kN": 750, "fatigue_load_limit_kN": 78, "max_rpm": 3000, "reference_speed_rpm": 2000, "limiting_speed_rpm": 3000, "weight_g": 7100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 110 mm shaft carrying heavy radial load with misalignment or deflection, SKF lists 24122 under catalogue execution 24122 CC/W33: two barrel-roller rows on a sphered outer raceway. On the SKF nameplate, 24122 follows the ISO 15 convention: 2 for the spherical roller type, 41 for the dimension series 41 (medium OD, maximum width), final digits 22 for the 110 mm bore. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. The 35.0 mm radial section height ((180−110)/2) and 7100 g catalogue mass frame a 110 mm bore bearing rated at 539 kN C — roughly 4.90 kN of dynamic capacity per millimetre of bore before application factors. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.", "applications": [ "rolling-mill pinion and back-up shafts", "large vibrating screens and feeders", "marine propulsion and thruster shafts", "cement-mill trunnion and drive shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Mount the 110 mm bore 24122 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 24100-series series at 110 mm bore (180×69 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 3,000 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.", "Shaft and housing fillets must clear the bearing chamfer so the 69 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "Never use the tapered-bore CCK30/K30 variant's drive-up figures on this cylindrical-bore 24122; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 539/750 kN ratings are SKF catalogue values for this exact execution (24122 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 24122 (cylindrical bore as listed, tapered-bore 24122 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24122 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24122?", "a": "The 24122 CC/W33 is a double-row spherical roller bearing with 110 mm bore, 180 mm outer diameter and 69 mm width (4.331 × 7.087 × 2.717 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 539 kN, C0 750 kN, fatigue load limit Pu 78 kN, reference speed 2,000 r/min, limiting speed 3,000 r/min, mass about 7100 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 24122 bore code work?", "a": "The last two digits of 24122 are bore code 22, so 22 × 5 = 110 mm bore. The 180 mm OD and 69 mm width come from the ISO 15 dimension-series plan (dimension series 41 (medium OD, maximum width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 24122?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper." }, { "q": "Can 24122 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 24122K30 variant be used instead?", "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24122 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "24122", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "24122-CCK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) execution on AH24122 withdrawal sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C4122-2CS5V-GEM9", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 4122-2CS5V/GEM9 shares the 110×180×69 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C4122-V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 4122 V shares the 110×180×69 mm envelope but catalogue C/C0 differ (670/1000 kN vs 539/750 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24122", "24122 CC/W33" ], "locale_variants": {} }, { "sku": "24124", "brand": "SKF", "manufacturer_designation": "SKF 24124 CC/W33", "series": "24100-series", "type": "spherical_roller", "d_mm": 120, "D_mm": 200, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 679, "static_load_kN": 950, "fatigue_load_limit_kN": 95, "max_rpm": 2600, "reference_speed_rpm": 1900, "limiting_speed_rpm": 2600, "weight_g": 10500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number 24124 CC/W33 in SKF catalogue PUB BU/P1 17000 denotes a double-row spherical roller bearing for a 120 mm shaft, dimension series 41 (medium OD, maximum width), with open execution and two pressed-steel cages with a floating guide ring. Reading the designation: the leading 2 marks a spherical roller bearing, the 41 is the ISO 15 dimension series (dimension series 41 (medium OD, maximum width)), and the last two digits encode the 120 mm bore; the 200 mm OD and 80 mm width follow the ISO 15 general plan. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. At 1,900 r/min reference speed the 40.0 mm-section 24124 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 2,600 r/min as the mechanical ceiling. A 120 mm rotating inner ring usually runs m6 on the shaft with H7 in the housing; for vibrating-screen duty the outer ring is instead held tight and the shaft seat loosened — follow the screen builder's fit schedule.", "applications": [ "large induced-draft fan rotors", "SAG and ball-mill drive shafts", "large mining crusher main shafts", "wind-turbine main shaft support" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still" ], "pitfalls": [ "At 120 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24100-series series at 120 mm bore (200×80 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 2,600 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.", "Never use the tapered-bore CCK30/K30 variant's drive-up figures on this cylindrical-bore 24124; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "Catalogue reference speed and limiting speed are different limits: the 1,900 r/min reference is a thermal criterion under load, while the 2,600 r/min limiting value is the mechanical ceiling — observe both.", "The 679/950 kN ratings are SKF catalogue values for this exact execution (24124 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 24124 (cylindrical bore as listed, tapered-bore 24124 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24124 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24124?", "a": "The 24124 CC/W33 is a double-row spherical roller bearing with 120 mm bore, 200 mm outer diameter and 80 mm width (4.724 × 7.874 × 3.15 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 679 kN, C0 950 kN, fatigue load limit Pu 95 kN, reference speed 1,900 r/min, limiting speed 2,600 r/min, mass about 10500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 24124 bore code work?", "a": "The last two digits of 24124 are bore code 24, so 24 × 5 = 120 mm bore. The 200 mm OD and 80 mm width come from the ISO 15 dimension-series plan (dimension series 41 (medium OD, maximum width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 24124?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper." }, { "q": "Can 24124 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 24124K30 variant be used instead?", "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24124 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "24124", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "24124-CCK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) execution on AH24124 withdrawal sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C4124-V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 4124 V shares the 120×200×80 mm envelope but catalogue C/C0 differ (780/1120 kN vs 679/950 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24124", "24124 CC/W33" ], "locale_variants": {} }, { "sku": "24126", "brand": "SKF", "manufacturer_designation": "SKF 24126 CC/W33", "series": "24100-series", "type": "spherical_roller", "d_mm": 130, "D_mm": 210, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 699, "static_load_kN": 1000, "fatigue_load_limit_kN": 100, "max_rpm": 2400, "reference_speed_rpm": 1700, "limiting_speed_rpm": 2400, "weight_g": 11000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 24126 CC/W33 is a 130×210×80 mm spherical roller bearing — the dimension series 41 (medium OD, maximum width) entry for a 130 mm shaft, with two rows of symmetrical barrel rollers for combined radial and axial load. Numbering ties the bearing to its envelope: 24126 means spherical-roller type, dimension series 41, 130 mm bore — which is why the 210×80 mm outline swaps dimensionally with other ISO 15 bearings of the same code. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. With C 699 kN and C0 1000 kN, the 24126 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 24126 CCK30/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.", "applications": [ "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "steel-plant continuous-caster segments", "large induced-draft fan rotors" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "At 130 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24100-series series at 130 mm bore (210×80 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 2,400 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.", "Catalogue reference speed and limiting speed are different limits: the 1,700 r/min reference is a thermal criterion under load, while the 2,400 r/min limiting value is the mechanical ceiling — observe both.", "The 24126 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 699/1000 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The 699/1000 kN ratings are SKF catalogue values for this exact execution (24126 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 24126 (cylindrical bore as listed, tapered-bore 24126 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24126 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24126?", "a": "The 24126 CC/W33 is a double-row spherical roller bearing with 130 mm bore, 210 mm outer diameter and 80 mm width (5.118 × 8.268 × 3.15 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 699 kN, C0 1000 kN, fatigue load limit Pu 100 kN, reference speed 1,700 r/min, limiting speed 2,400 r/min, mass about 11000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 24126 bore code work?", "a": "The last two digits of 24126 are bore code 26, so 26 × 5 = 130 mm bore. The 210 mm OD and 80 mm width come from the ISO 15 dimension-series plan (dimension series 41 (medium OD, maximum width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 24126?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper." }, { "q": "Can 24126 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 24126K30 variant be used instead?", "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24126 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "24126", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "24126-CCK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) execution on AH24126 withdrawal sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C4126-2CS5V-GEM9", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 4126-2CS5V/GEM9 shares the 130×210×80 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24126", "24126 CC/W33" ], "locale_variants": {} }, { "sku": "24128", "brand": "SKF", "manufacturer_designation": "SKF 24128 CC/W33", "series": "24100-series", "type": "spherical_roller", "d_mm": 140, "D_mm": 225, "B_mm": 85, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 796, "static_load_kN": 1160, "fatigue_load_limit_kN": 112, "max_rpm": 2200, "reference_speed_rpm": 1600, "limiting_speed_rpm": 2200, "weight_g": 13500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "24128 CC/W33 belongs to the SKF spherical roller range — the 140 mm bore entry in the 24100-series series (dimension series 41 (medium OD, maximum width)), dimensioned 225 mm OD and 85 mm wide. The code breaks down as type digit 2 (double-row spherical roller), dimension series 41 (dimension series 41 (medium OD, maximum width)), and bore code 28 = 140 mm; dimensions 140×225×85 mm therefore match the ISO 15 envelope. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. Selection arithmetic: the C0/C ratio is about 1.46 (static 1160 kN against dynamic 796 kN), typical of a spherical roller sized for heavy combined loads, and the 112 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. For relubrication, route the grease duct to the outer-ring W33 groove position where fitted, and purge until fresh grease appears at the seal — the 85 mm width across two roller rows needs the full charge.", "applications": [ "SAG and ball-mill drive shafts", "large mining crusher main shafts", "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still" ], "pitfalls": [ "At 140 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24100-series series at 140 mm bore (225×85 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 2,200 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.", "The 24128 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 796/1160 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The 13500 g mass and 85 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 24128.", "The 796/1160 kN ratings are SKF catalogue values for this exact execution (24128 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 24128 (cylindrical bore as listed, tapered-bore 24128 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24128 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24128?", "a": "The 24128 CC/W33 is a double-row spherical roller bearing with 140 mm bore, 225 mm outer diameter and 85 mm width (5.512 × 8.858 × 3.346 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 796 kN, C0 1160 kN, fatigue load limit Pu 112 kN, reference speed 1,600 r/min, limiting speed 2,200 r/min, mass about 13500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 24128 bore code work?", "a": "The last two digits of 24128 are bore code 28, so 28 × 5 = 140 mm bore. The 225 mm OD and 85 mm width come from the ISO 15 dimension-series plan (dimension series 41 (medium OD, maximum width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 24128?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper." }, { "q": "Can 24128 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 24128K30 variant be used instead?", "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24128 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "24128", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "24128-CCK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) execution on AH24128 withdrawal sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C4128-2CS5V-GEM9", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 4128-2CS5V/GEM9 shares the 140×225×85 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C4128-V-VE240", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 4128 V/VE240 shares the 140×225×85 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24128", "24128 CC/W33" ], "locale_variants": {} }, { "sku": "24130", "brand": "SKF", "manufacturer_designation": "SKF 24130 CC/W33", "series": "24100-series", "type": "spherical_roller", "d_mm": 150, "D_mm": 250, "B_mm": 100, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1054, "static_load_kN": 1530, "fatigue_load_limit_kN": 146, "max_rpm": 2000, "reference_speed_rpm": 1400, "limiting_speed_rpm": 2000, "weight_g": 20000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF 24130 (24130 CC/W33) is the spherical-roller choice for a 150 mm shaft — barrel rollers between an inner ring with two raceways and a common sphered outer raceway inside the 250×100 mm ISO 15 envelope. On the SKF nameplate, 24130 follows the ISO 15 convention: 2 for the spherical roller type, 41 for the dimension series 41 (medium OD, maximum width), final digits 30 for the 150 mm bore. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. At 1,400 r/min reference speed the 50.0 mm-section 24130 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 2,000 r/min as the mechanical ceiling. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 24130 CCK30/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.", "applications": [ "large induced-draft fan rotors", "SAG and ball-mill drive shafts", "large mining crusher main shafts", "wind-turbine main shaft support" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems" ], "pitfalls": [ "At 150 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24100-series series at 150 mm bore (250×100 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 2,000 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.", "Shaft and housing fillets must clear the bearing chamfer so the 100 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 20000 g mass and 100 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 24130.", "The 1054/1530 kN ratings are SKF catalogue values for this exact execution (24130 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 24130 (cylindrical bore as listed, tapered-bore 24130 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24130 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24130?", "a": "The 24130 CC/W33 is a double-row spherical roller bearing with 150 mm bore, 250 mm outer diameter and 100 mm width (5.906 × 9.843 × 3.937 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1054 kN, C0 1530 kN, fatigue load limit Pu 146 kN, reference speed 1,400 r/min, limiting speed 2,000 r/min, mass about 20000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 24130 bore code work?", "a": "The last two digits of 24130 are bore code 30, so 30 × 5 = 150 mm bore. The 250 mm OD and 100 mm width come from the ISO 15 dimension-series plan (dimension series 41 (medium OD, maximum width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 24130?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper." }, { "q": "Can 24130 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 24130K30 variant be used instead?", "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24130 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "24130", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "24130-CCK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) execution on AH24130 withdrawal sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C4130-V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 4130 V shares the 150×250×100 mm envelope but catalogue C/C0 differ (1220/1860 kN vs 1054/1530 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24130", "24130 CC/W33" ], "locale_variants": {} }, { "sku": "24132", "brand": "SKF", "manufacturer_designation": "SKF 24132 CC/W33", "series": "24100-series", "type": "spherical_roller", "d_mm": 160, "D_mm": 270, "B_mm": 109, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1227, "static_load_kN": 1760, "fatigue_load_limit_kN": 163, "max_rpm": 1900, "reference_speed_rpm": 1300, "limiting_speed_rpm": 1900, "weight_g": 25000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "24132 is a double-row spherical roller bearing in the 24100-series family: two rows of barrel rollers on a common sphered outer raceway, self-aligning under shaft deflection, listed by SKF in SKF catalogue PUB BU/P1 17000. Reading the designation: the leading 2 marks a spherical roller bearing, the 41 is the ISO 15 dimension series (dimension series 41 (medium OD, maximum width)), and the last two digits encode the 160 mm bore; the 270 mm OD and 109 mm width follow the ISO 15 general plan. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. With C 1227 kN and C0 1760 kN, the 24132 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. For relubrication, route the grease duct to the outer-ring W33 groove position where fitted, and purge until fresh grease appears at the seal — the 109 mm width across two roller rows needs the full charge.", "applications": [ "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "steel-plant continuous-caster segments", "large induced-draft fan rotors" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 160 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24100-series series at 160 mm bore (270×109 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 1,900 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.", "Never use the tapered-bore CCK30/K30 variant's drive-up figures on this cylindrical-bore 24132; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 1227/1760 kN ratings are SKF catalogue values for this exact execution (24132 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 24132 (cylindrical bore as listed, tapered-bore 24132 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24132 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24132?", "a": "The 24132 CC/W33 is a double-row spherical roller bearing with 160 mm bore, 270 mm outer diameter and 109 mm width (6.299 × 10.63 × 4.291 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1227 kN, C0 1760 kN, fatigue load limit Pu 163 kN, reference speed 1,300 r/min, limiting speed 1,900 r/min, mass about 25000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 24132 bore code work?", "a": "The last two digits of 24132 are bore code 32, so 32 × 5 = 160 mm bore. The 270 mm OD and 109 mm width come from the ISO 15 dimension-series plan (dimension series 41 (medium OD, maximum width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 24132?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper." }, { "q": "Can 24132 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 24132K30 variant be used instead?", "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24132 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "24132", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "24132-CCK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) execution on AH24132 withdrawal sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24132", "24132 CC/W33" ], "locale_variants": {} }, { "sku": "24134", "brand": "SKF", "manufacturer_designation": "SKF 24134 CC/W33", "series": "24100-series", "type": "spherical_roller", "d_mm": 170, "D_mm": 280, "B_mm": 109, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1270, "static_load_kN": 1860, "fatigue_load_limit_kN": 170, "max_rpm": 1800, "reference_speed_rpm": 1200, "limiting_speed_rpm": 1800, "weight_g": 27500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 24134 appears as 24134 CC/W33: an open, double-row spherical roller bearing, self-aligning by virtue of the sphered outer raceway, sized 170×280×109 mm to the ISO 15 boundary plan. Numbering ties the bearing to its envelope: 24134 means spherical-roller type, dimension series 41, 170 mm bore — which is why the 280×109 mm outline swaps dimensionally with other ISO 15 bearings of the same code. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. Selection arithmetic: the C0/C ratio is about 1.46 (static 1860 kN against dynamic 1270 kN), typical of a spherical roller sized for heavy combined loads, and the 170 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Drive-on force must go through the ring being fitted: press or induction-heat the inner ring onto the 170 mm shaft (max 120 °C) and never transmit mounting force through the roller complement, or the raceways brinell.", "applications": [ "SAG and ball-mill drive shafts", "large mining crusher main shafts", "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems" ], "pitfalls": [ "At 170 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24100-series series at 170 mm bore (280×109 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 1,800 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.", "Catalogue reference speed and limiting speed are different limits: the 1,200 r/min reference is a thermal criterion under load, while the 1,800 r/min limiting value is the mechanical ceiling — observe both.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 24134 pits long before its L10 life.", "The 1270/1860 kN ratings are SKF catalogue values for this exact execution (24134 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 24134 (cylindrical bore as listed, tapered-bore 24134 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24134 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24134?", "a": "The 24134 CC/W33 is a double-row spherical roller bearing with 170 mm bore, 280 mm outer diameter and 109 mm width (6.693 × 11.024 × 4.291 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1270 kN, C0 1860 kN, fatigue load limit Pu 170 kN, reference speed 1,200 r/min, limiting speed 1,800 r/min, mass about 27500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 24134 bore code work?", "a": "The last two digits of 24134 are bore code 34, so 34 × 5 = 170 mm bore. The 280 mm OD and 109 mm width come from the ISO 15 dimension-series plan (dimension series 41 (medium OD, maximum width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 24134?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper." }, { "q": "Can 24134 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 24134K30 variant be used instead?", "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24134 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "24134", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "24134-CCK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) execution on AH24134 withdrawal sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24134", "24134 CC/W33" ], "locale_variants": {} }, { "sku": "24136", "brand": "SKF", "manufacturer_designation": "SKF 24136 CC/W33", "series": "24100-series", "type": "spherical_roller", "d_mm": 180, "D_mm": 300, "B_mm": 118, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1449, "static_load_kN": 2160, "fatigue_load_limit_kN": 196, "max_rpm": 1600, "reference_speed_rpm": 1100, "limiting_speed_rpm": 1600, "weight_g": 34500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 180 mm shaft carrying heavy radial load with misalignment or deflection, SKF lists 24136 under catalogue execution 24136 CC/W33: two barrel-roller rows on a sphered outer raceway. The code breaks down as type digit 2 (double-row spherical roller), dimension series 41 (dimension series 41 (medium OD, maximum width)), and bore code 36 = 180 mm; dimensions 180×300×118 mm therefore match the ISO 15 envelope. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. Catalogue mass 34500 g for the 180×300×118 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. After mounting, swing the outer ring to confirm free self-alignment: the 24136 should tilt through its full catalogue misalignment range without binding; a stiff joint signals a cocked seat or shoulder interference.", "applications": [ "large dredger and marine winch drums", "steel-plant continuous-caster segments", "large induced-draft fan rotors", "SAG and ball-mill drive shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 180 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24100-series series at 180 mm bore (300×118 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 1,600 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.", "The 24136 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 1449/2160 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "Shaft and housing fillets must clear the bearing chamfer so the 118 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 1449/2160 kN ratings are SKF catalogue values for this exact execution (24136 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 24136 (cylindrical bore as listed, tapered-bore 24136 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24136 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24136?", "a": "The 24136 CC/W33 is a double-row spherical roller bearing with 180 mm bore, 300 mm outer diameter and 118 mm width (7.087 × 11.811 × 4.646 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1449 kN, C0 2160 kN, fatigue load limit Pu 196 kN, reference speed 1,100 r/min, limiting speed 1,600 r/min, mass about 34500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 24136 bore code work?", "a": "The last two digits of 24136 are bore code 36, so 36 × 5 = 180 mm bore. The 300 mm OD and 118 mm width come from the ISO 15 dimension-series plan (dimension series 41 (medium OD, maximum width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 24136?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper." }, { "q": "Can 24136 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 24136K30 variant be used instead?", "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24136 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "24136", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "24136-CCK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) execution on AH24136 withdrawal sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C4136-V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 4136 V shares the 180×300×118 mm envelope but catalogue C/C0 differ (1760/2700 kN vs 1449/2160 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24136", "24136 CC/W33" ], "locale_variants": {} }, { "sku": "24138", "brand": "SKF", "manufacturer_designation": "SKF 24138 CC/W33", "series": "24100-series", "type": "spherical_roller", "d_mm": 190, "D_mm": 320, "B_mm": 128, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1652, "static_load_kN": 2500, "fatigue_load_limit_kN": 212, "max_rpm": 1500, "reference_speed_rpm": 1100, "limiting_speed_rpm": 1500, "weight_g": 43000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number 24138 CC/W33 in SKF catalogue PUB BU/P1 17000 denotes a double-row spherical roller bearing for a 190 mm shaft, dimension series 41 (medium OD, maximum width), with open execution and two pressed-steel cages with a floating guide ring. Digit by digit, 24138 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 41, and bore reference 38 resolving to 190 mm; 320 mm OD and 128 mm width are the matching ISO 15 boundary values. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. Speed planning uses two different ceilings: 1,100 r/min thermal reference and 1,500 r/min mechanical limiting speed. Mount with the spherical bearing's self-alignment in mind: it compensates ≈ 0.5–2.5° of misalignment depending on series, but the shaft and housing seats still set the datum — a rotating inner ring on a 190 mm shaft typically takes a m6 seat with an H7 housing bore.", "applications": [ "large mining crusher main shafts", "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems" ], "pitfalls": [ "At 190 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24100-series series at 190 mm bore (320×128 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 1,500 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.", "The 43000 g mass and 128 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 24138.", "Never use the tapered-bore CCK30/K30 variant's drive-up figures on this cylindrical-bore 24138; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 1652/2500 kN ratings are SKF catalogue values for this exact execution (24138 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 24138 (cylindrical bore as listed, tapered-bore 24138 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24138 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24138?", "a": "The 24138 CC/W33 is a double-row spherical roller bearing with 190 mm bore, 320 mm outer diameter and 128 mm width (7.48 × 12.598 × 5.039 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1652 kN, C0 2500 kN, fatigue load limit Pu 212 kN, reference speed 1,100 r/min, limiting speed 1,500 r/min, mass about 43000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 24138 bore code work?", "a": "The last two digits of 24138 are bore code 38, so 38 × 5 = 190 mm bore. The 320 mm OD and 128 mm width come from the ISO 15 dimension-series plan (dimension series 41 (medium OD, maximum width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 24138?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper." }, { "q": "Can 24138 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 24138K30 variant be used instead?", "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24138 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "24138", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "24138-CCK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) execution on AH24138 withdrawal sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24138", "24138 CC/W33" ], "locale_variants": {} }, { "sku": "24140", "brand": "SKF", "manufacturer_designation": "SKF 24140 CC/W33", "series": "24100-series", "type": "spherical_roller", "d_mm": 200, "D_mm": 340, "B_mm": 140, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1865, "static_load_kN": 2800, "fatigue_load_limit_kN": 232, "max_rpm": 1400, "reference_speed_rpm": 1000, "limiting_speed_rpm": 1400, "weight_g": 53500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 24140 CC/W33 is a 200×340×140 mm spherical roller bearing — the dimension series 41 (medium OD, maximum width) entry for a 200 mm shaft, with two rows of symmetrical barrel rollers for combined radial and axial load. Reading the designation: the leading 2 marks a spherical roller bearing, the 41 is the ISO 15 dimension series (dimension series 41 (medium OD, maximum width)), and the last two digits encode the 200 mm bore; the 340 mm OD and 140 mm width follow the ISO 15 general plan. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. Selection arithmetic: the C0/C ratio is about 1.50 (static 2800 kN against dynamic 1865 kN), typical of a spherical roller sized for heavy combined loads, and the 232 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. After mounting, swing the outer ring to confirm free self-alignment: the 24140 should tilt through its full catalogue misalignment range without binding; a stiff joint signals a cocked seat or shoulder interference.", "applications": [ "SAG and ball-mill drive shafts", "large mining crusher main shafts", "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "At 200 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24100-series series at 200 mm bore (340×140 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 1,400 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.", "Never use the tapered-bore CCK30/K30 variant's drive-up figures on this cylindrical-bore 24140; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "Never use the tapered-bore CCK30/K30 variant's drive-up figures on this cylindrical-bore 24140; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 1865/2800 kN ratings are SKF catalogue values for this exact execution (24140 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 24140 (cylindrical bore as listed, tapered-bore 24140 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24140 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24140?", "a": "The 24140 CC/W33 is a double-row spherical roller bearing with 200 mm bore, 340 mm outer diameter and 140 mm width (7.874 × 13.386 × 5.512 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1865 kN, C0 2800 kN, fatigue load limit Pu 232 kN, reference speed 1,000 r/min, limiting speed 1,400 r/min, mass about 53500 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 24140 bore code work?", "a": "The last two digits of 24140 are bore code 40, so 40 × 5 = 200 mm bore. The 340 mm OD and 140 mm width come from the ISO 15 dimension-series plan (dimension series 41 (medium OD, maximum width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 24140?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper." }, { "q": "Can 24140 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 24140K30 variant be used instead?", "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24140 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "24140", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "24140-CCK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) execution on AH24140 withdrawal sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24140", "24140 CC/W33" ], "locale_variants": {} }, { "sku": "24144", "brand": "SKF", "manufacturer_designation": "SKF 24144 CC/W33", "series": "24100-series", "type": "spherical_roller", "d_mm": 220, "D_mm": 370, "B_mm": 150, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2197, "static_load_kN": 3350, "fatigue_load_limit_kN": 285, "max_rpm": 1200, "reference_speed_rpm": 850, "limiting_speed_rpm": 1200, "weight_g": 67000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF 24144 (24144 CC/W33) is the spherical-roller choice for a 220 mm shaft — barrel rollers between an inner ring with two raceways and a common sphered outer raceway inside the 370×150 mm ISO 15 envelope. The code breaks down as type digit 2 (double-row spherical roller), dimension series 41 (dimension series 41 (medium OD, maximum width)), and bore code 44 = 220 mm; dimensions 220×370×150 mm therefore match the ISO 15 envelope. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. Speed planning uses two different ceilings: 850 r/min thermal reference and 1,200 r/min mechanical limiting speed. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.", "applications": [ "large mining crusher main shafts", "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "At 220 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24100-series series at 220 mm bore (370×150 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 1,200 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.", "The 24144 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 2197/3350 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The 24144 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 2197/3350 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The 2197/3350 kN ratings are SKF catalogue values for this exact execution (24144 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 24144 (cylindrical bore as listed, tapered-bore 24144 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24144 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24144?", "a": "The 24144 CC/W33 is a double-row spherical roller bearing with 220 mm bore, 370 mm outer diameter and 150 mm width (8.661 × 14.567 × 5.906 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 2197 kN, C0 3350 kN, fatigue load limit Pu 285 kN, reference speed 850 r/min, limiting speed 1,200 r/min, mass about 67000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 24144 bore code work?", "a": "The last two digits of 24144 are bore code 44, so 44 × 5 = 220 mm bore. The 370 mm OD and 150 mm width come from the ISO 15 dimension-series plan (dimension series 41 (medium OD, maximum width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 24144?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper." }, { "q": "Can 24144 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 24144K30 variant be used instead?", "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24144 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "24144", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "24144-CCK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) execution on AOH24144 withdrawal sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24144", "24144 CC/W33" ], "locale_variants": {} }, { "sku": "24148", "brand": "SKF", "manufacturer_designation": "SKF 24148 CC/W33", "series": "24100-series", "type": "spherical_roller", "d_mm": 240, "D_mm": 400, "B_mm": 160, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2489, "static_load_kN": 3900, "fatigue_load_limit_kN": 320, "max_rpm": 1100, "reference_speed_rpm": 750, "limiting_speed_rpm": 1100, "weight_g": 83000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 24148 appears as 24148 CC/W33: an open, double-row spherical roller bearing, self-aligning by virtue of the sphered outer raceway, sized 240×400×160 mm to the ISO 15 boundary plan. On the SKF nameplate, 24148 follows the ISO 15 convention: 2 for the spherical roller type, 41 for the dimension series 41 (medium OD, maximum width), final digits 48 for the 240 mm bore. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. The 80.0 mm radial section height ((400−240)/2) and 83000 g catalogue mass frame a 240 mm bore bearing rated at 2489 kN C — roughly 10.37 kN of dynamic capacity per millimetre of bore before application factors. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 24148 CCK30/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.", "applications": [ "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "steel-plant continuous-caster segments" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "At 240 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24100-series series at 240 mm bore (400×160 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 1,100 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 2489/3900 kN ratings are SKF catalogue values for this exact execution (24148 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 24148 (cylindrical bore as listed, tapered-bore 24148 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24148 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24148?", "a": "The 24148 CC/W33 is a double-row spherical roller bearing with 240 mm bore, 400 mm outer diameter and 160 mm width (9.449 × 15.748 × 6.299 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 2489 kN, C0 3900 kN, fatigue load limit Pu 320 kN, reference speed 750 r/min, limiting speed 1,100 r/min, mass about 83000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 24148 bore code work?", "a": "The last two digits of 24148 are bore code 48, so 48 × 5 = 240 mm bore. The 400 mm OD and 160 mm width come from the ISO 15 dimension-series plan (dimension series 41 (medium OD, maximum width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 24148?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper." }, { "q": "Can 24148 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 24148K30 variant be used instead?", "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24148 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "24148", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "24148-CCK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) execution on AOH24148 withdrawal sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24148", "24148 CC/W33" ], "locale_variants": {} }, { "sku": "24152", "brand": "SKF", "manufacturer_designation": "SKF 24152 CC/W33", "series": "24100-series", "type": "spherical_roller", "d_mm": 260, "D_mm": 440, "B_mm": 180, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 3086, "static_load_kN": 4800, "fatigue_load_limit_kN": 380, "max_rpm": 950, "reference_speed_rpm": 670, "limiting_speed_rpm": 950, "weight_g": 110000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number 24152 CC/W33 in SKF catalogue PUB BU/P1 17000 denotes a double-row spherical roller bearing for a 260 mm shaft, dimension series 41 (medium OD, maximum width), with open execution and two pressed-steel cages with a floating guide ring. The code breaks down as type digit 2 (double-row spherical roller), dimension series 41 (dimension series 41 (medium OD, maximum width)), and bore code 52 = 260 mm; dimensions 260×440×180 mm therefore match the ISO 15 envelope. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. The 380 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.56 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 24152 CCK30/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.", "applications": [ "steel-plant continuous-caster segments", "large induced-draft fan rotors", "SAG and ball-mill drive shafts", "large mining crusher main shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems" ], "pitfalls": [ "At 260 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24100-series series at 260 mm bore (440×180 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 950 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.", "The 24152 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 3086/4800 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 24152 pits long before its L10 life.", "The 3086/4800 kN ratings are SKF catalogue values for this exact execution (24152 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 24152 (cylindrical bore as listed, tapered-bore 24152 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24152 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24152?", "a": "The 24152 CC/W33 is a double-row spherical roller bearing with 260 mm bore, 440 mm outer diameter and 180 mm width (10.236 × 17.323 × 7.087 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 3086 kN, C0 4800 kN, fatigue load limit Pu 380 kN, reference speed 670 r/min, limiting speed 950 r/min, mass about 110000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 24152 bore code work?", "a": "The last two digits of 24152 are bore code 52, so 52 × 5 = 260 mm bore. The 440 mm OD and 180 mm width come from the ISO 15 dimension-series plan (dimension series 41 (medium OD, maximum width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 24152?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper." }, { "q": "Can 24152 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 24152K30 variant be used instead?", "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24152 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "24152", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "24152-CCK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) execution on AOH24152 withdrawal sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24152", "24152 CC/W33" ], "locale_variants": {} }, { "sku": "24156", "brand": "SKF", "manufacturer_designation": "SKF 24156 CC/W33", "series": "24100-series", "type": "spherical_roller", "d_mm": 280, "D_mm": 460, "B_mm": 180, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 3183, "static_load_kN": 5100, "fatigue_load_limit_kN": 415, "max_rpm": 900, "reference_speed_rpm": 630, "limiting_speed_rpm": 900, "weight_g": 120000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "24156 CC/W33 belongs to the SKF spherical roller range — the 280 mm bore entry in the 24100-series series (dimension series 41 (medium OD, maximum width)), dimensioned 460 mm OD and 180 mm wide. On the SKF nameplate, 24156 follows the ISO 15 convention: 2 for the spherical roller type, 41 for the dimension series 41 (medium OD, maximum width), final digits 56 for the 280 mm bore. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. At 630 r/min reference speed the 90.0 mm-section 24156 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 900 r/min as the mechanical ceiling. Drive-on force must go through the ring being fitted: press or induction-heat the inner ring onto the 280 mm shaft (max 120 °C) and never transmit mounting force through the roller complement, or the raceways brinell.", "applications": [ "large induced-draft fan rotors", "SAG and ball-mill drive shafts", "large mining crusher main shafts", "wind-turbine main shaft support" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems" ], "pitfalls": [ "At 280 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24100-series series at 280 mm bore (460×180 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 900 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "Never use the tapered-bore CCK30/K30 variant's drive-up figures on this cylindrical-bore 24156; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 3183/5100 kN ratings are SKF catalogue values for this exact execution (24156 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 24156 (cylindrical bore as listed, tapered-bore 24156 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24156 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24156?", "a": "The 24156 CC/W33 is a double-row spherical roller bearing with 280 mm bore, 460 mm outer diameter and 180 mm width (11.024 × 18.11 × 7.087 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 3183 kN, C0 5100 kN, fatigue load limit Pu 415 kN, reference speed 630 r/min, limiting speed 900 r/min, mass about 120000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 24156 bore code work?", "a": "The last two digits of 24156 are bore code 56, so 56 × 5 = 280 mm bore. The 460 mm OD and 180 mm width come from the ISO 15 dimension-series plan (dimension series 41 (medium OD, maximum width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 24156?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper." }, { "q": "Can 24156 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 24156K30 variant be used instead?", "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24156 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "24156", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "24156-CCK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) execution on AOH24156 withdrawal sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24156", "24156 CC/W33" ], "locale_variants": {} }, { "sku": "24160", "brand": "SKF", "manufacturer_designation": "SKF 24160 CC/W33", "series": "24100-series", "type": "spherical_roller", "d_mm": 300, "D_mm": 500, "B_mm": 200, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 3876, "static_load_kN": 6300, "fatigue_load_limit_kN": 465, "max_rpm": 800, "reference_speed_rpm": 560, "limiting_speed_rpm": 800, "weight_g": 160000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "24160 is a double-row spherical roller bearing in the 24100-series family: two rows of barrel rollers on a common sphered outer raceway, self-aligning under shaft deflection, listed by SKF in SKF catalogue PUB BU/P1 17000. The code breaks down as type digit 2 (double-row spherical roller), dimension series 41 (dimension series 41 (medium OD, maximum width)), and bore code 60 = 300 mm; dimensions 300×500×200 mm therefore match the ISO 15 envelope. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. The 100.0 mm radial section height ((500−300)/2) and 160000 g catalogue mass frame a 300 mm bore bearing rated at 3876 kN C — roughly 12.92 kN of dynamic capacity per millimetre of bore before application factors. Drive-on force must go through the ring being fitted: press or induction-heat the inner ring onto the 300 mm shaft (max 120 °C) and never transmit mounting force through the roller complement, or the raceways brinell.", "applications": [ "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "steel-plant continuous-caster segments" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still" ], "pitfalls": [ "At 300 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24100-series series at 300 mm bore (500×200 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 800 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.", "The 24160 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 3876/6300 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "Catalogue reference speed and limiting speed are different limits: the 560 r/min reference is a thermal criterion under load, while the 800 r/min limiting value is the mechanical ceiling — observe both.", "The 3876/6300 kN ratings are SKF catalogue values for this exact execution (24160 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 24160 (cylindrical bore as listed, tapered-bore 24160 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24160 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24160?", "a": "The 24160 CC/W33 is a double-row spherical roller bearing with 300 mm bore, 500 mm outer diameter and 200 mm width (11.811 × 19.685 × 7.874 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 3876 kN, C0 6300 kN, fatigue load limit Pu 465 kN, reference speed 560 r/min, limiting speed 800 r/min, mass about 160000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 24160 bore code work?", "a": "The last two digits of 24160 are bore code 60, so 60 × 5 = 300 mm bore. The 500 mm OD and 200 mm width come from the ISO 15 dimension-series plan (dimension series 41 (medium OD, maximum width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 24160?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper." }, { "q": "Can 24160 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 24160K30 variant be used instead?", "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24160 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "24160", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "24160-CCK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) execution on AOH24160 withdrawal sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24160", "24160 CC/W33" ], "locale_variants": {} }, { "sku": "24164", "brand": "SKF", "manufacturer_designation": "SKF 24164 CC/W33", "series": "24100-series", "type": "spherical_roller", "d_mm": 320, "D_mm": 540, "B_mm": 218, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4395, "static_load_kN": 7100, "fatigue_load_limit_kN": 510, "max_rpm": 700, "reference_speed_rpm": 500, "limiting_speed_rpm": 700, "weight_g": 210000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 320 mm shaft carrying heavy radial load with misalignment or deflection, SKF lists 24164 under catalogue execution 24164 CC/W33: two barrel-roller rows on a sphered outer raceway. On the SKF nameplate, 24164 follows the ISO 15 convention: 2 for the spherical roller type, 41 for the dimension series 41 (medium OD, maximum width), final digits 64 for the 320 mm bore. SKF basic executions here are CC/W33; specialist suffixes change the bearing materially — VA405 for vibrating screens (C4 clearance, surface-hardened cage), 2CS5 for the sealed variant — and must be quoted in full when ordering. With C 4395 kN and C0 7100 kN, the 24164 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. Mount with the spherical bearing's self-alignment in mind: it compensates ≈ 0.5–2.5° of misalignment depending on series, but the shaft and housing seats still set the datum — a rotating inner ring on a 320 mm shaft typically takes a m6 seat with an H7 housing bore.", "applications": [ "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "steel-plant continuous-caster segments", "large induced-draft fan rotors" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still" ], "pitfalls": [ "At 320 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24100-series series at 320 mm bore (540×218 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 700 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 210000 g mass and 218 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 24164.", "The 4395/7100 kN ratings are SKF catalogue values for this exact execution (24164 CC/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 24164 (cylindrical bore as listed, tapered-bore 24164 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24164 CC/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24164?", "a": "The 24164 CC/W33 is a double-row spherical roller bearing with 320 mm bore, 540 mm outer diameter and 218 mm width (12.598 × 21.26 × 8.583 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 4395 kN, C0 7100 kN, fatigue load limit Pu 510 kN, reference speed 500 r/min, limiting speed 700 r/min, mass about 210000 g. It is an open, self-aligning bearing with two pressed-steel cages with a floating guide ring." }, { "q": "How does the 24164 bore code work?", "a": "The last two digits of 24164 are bore code 64, so 64 × 5 = 320 mm bore. The 540 mm OD and 218 mm width come from the ISO 15 dimension-series plan (dimension series 41 (medium OD, maximum width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the CC/W33 suffix mean on 24164?", "a": "CC denotes two pressed-steel cages with a floating guide ring between the roller rows, and W33 adds an annular groove plus three lubrication holes in the outer ring for relubrication. In dimension series 40/41 the tapered-bore counterpart carries CCK30/W33 with a 1:30 taper." }, { "q": "Can 24164 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 24164K30 variant be used instead?", "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24164 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "24164", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "24164-CCK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) execution on AOH24164 withdrawal sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24164", "24164 CC/W33" ], "locale_variants": {} }, { "sku": "24168", "brand": "SKF", "manufacturer_designation": "SKF 24168 ECCJ/W33", "series": "24100-series", "type": "spherical_roller", "d_mm": 340, "D_mm": 580, "B_mm": 243, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5487, "static_load_kN": 8650, "fatigue_load_limit_kN": 630, "max_rpm": 630, "reference_speed_rpm": 430, "limiting_speed_rpm": 630, "weight_g": 280000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 24168 ECCJ/W33 is a 340×580×243 mm spherical roller bearing — the dimension series 41 (medium OD, maximum width) entry for a 340 mm shaft, with two rows of symmetrical barrel rollers for combined radial and axial load. Numbering ties the bearing to its envelope: 24168 means spherical-roller type, dimension series 41, 340 mm bore — which is why the 580×243 mm outline swaps dimensionally with other ISO 15 bearings of the same code. CJ/ECCJ bearings here run a stamped steel window cage rather than the older two-cage CC arrangement; quote the full ECCJ/W33 designation when ordering, and do not assume the K tapered-bore execution is a field conversion. Catalogue mass 280000 g for the 340×580×243 mm open execution covers the a stamped sheet-steel window-type cage with low-friction guidance (CJ design); tapered-bore and sealed variants differ in mass and carry their own order numbers. A 340 mm rotating inner ring usually runs m6 on the shaft with H7 in the housing; for vibrating-screen duty the outer ring is instead held tight and the shaft seat loosened — follow the screen builder's fit schedule.", "applications": [ "large dredger and marine winch drums", "steel-plant continuous-caster segments", "large induced-draft fan rotors", "SAG and ball-mill drive shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still" ], "pitfalls": [ "At 340 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24100-series series at 340 mm bore (580×243 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 630 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.", "Shaft and housing fillets must clear the bearing chamfer so the 243 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 24168 pits long before its L10 life.", "The 5487/8650 kN ratings are SKF catalogue values for this exact execution (24168 ECCJ/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 24168 (cylindrical bore as listed, tapered-bore 24168 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24168 ECCJ/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24168?", "a": "The 24168 ECCJ/W33 is a double-row spherical roller bearing with 340 mm bore, 580 mm outer diameter and 243 mm width (13.386 × 22.835 × 9.567 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 5487 kN, C0 8650 kN, fatigue load limit Pu 630 kN, reference speed 430 r/min, limiting speed 630 r/min, mass about 280000 g. It is an open, self-aligning bearing with a stamped sheet-steel window-type cage with low-friction guidance (CJ design)." }, { "q": "How does the 24168 bore code work?", "a": "The last two digits of 24168 are bore code 68, so 68 × 5 = 340 mm bore. The 580 mm OD and 243 mm width come from the ISO 15 dimension-series plan (dimension series 41 (medium OD, maximum width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the ECCJ/W33 suffix mean on 24168?", "a": "The suffix ECCJ/W33 reads ECCJ — the optimized, higher-capacity version of the CJ design, with a stamped sheet-steel window-type cage with low-friction guidance, plus W33 (outer-ring groove and three lubrication holes); CCK30/W33 is the 1:30 tapered-bore counterpart." }, { "q": "Can 24168 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 24168K30 variant be used instead?", "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24168 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "24168", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "24168-ECCK30J-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) execution on AOH24168 withdrawal sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C4168-K30MB", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 4168 K30MB shares the 340×580×243 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24168", "24168 ECCJ/W33" ], "locale_variants": {} }, { "sku": "24172", "brand": "SKF", "manufacturer_designation": "SKF 24172 ECCJ/W33", "series": "24100-series", "type": "spherical_roller", "d_mm": 360, "D_mm": 600, "B_mm": 243, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5737, "static_load_kN": 9300, "fatigue_load_limit_kN": 670, "max_rpm": 600, "reference_speed_rpm": 400, "limiting_speed_rpm": 600, "weight_g": 280000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF 24172 (24172 ECCJ/W33) is the spherical-roller choice for a 360 mm shaft — barrel rollers between an inner ring with two raceways and a common sphered outer raceway inside the 600×243 mm ISO 15 envelope. On the SKF nameplate, 24172 follows the ISO 15 convention: 2 for the spherical roller type, 41 for the dimension series 41 (medium OD, maximum width), final digits 72 for the 360 mm bore. CJ/ECCJ bearings here run a stamped steel window cage rather than the older two-cage CC arrangement; quote the full ECCJ/W33 designation when ordering, and do not assume the K tapered-bore execution is a field conversion. Selection arithmetic: the C0/C ratio is about 1.62 (static 9300 kN against dynamic 5737 kN), typical of a spherical roller sized for heavy combined loads, and the 670 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. A 360 mm rotating inner ring usually runs m6 on the shaft with H7 in the housing; for vibrating-screen duty the outer ring is instead held tight and the shaft seat loosened — follow the screen builder's fit schedule.", "applications": [ "SAG and ball-mill drive shafts", "large mining crusher main shafts", "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 360 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24100-series series at 360 mm bore (600×243 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 600 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "Shaft and housing fillets must clear the bearing chamfer so the 243 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 5737/9300 kN ratings are SKF catalogue values for this exact execution (24172 ECCJ/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 24172 (cylindrical bore as listed, tapered-bore 24172 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24172 ECCJ/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24172?", "a": "The 24172 ECCJ/W33 is a double-row spherical roller bearing with 360 mm bore, 600 mm outer diameter and 243 mm width (14.173 × 23.622 × 9.567 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 5737 kN, C0 9300 kN, fatigue load limit Pu 670 kN, reference speed 400 r/min, limiting speed 600 r/min, mass about 280000 g. It is an open, self-aligning bearing with a stamped sheet-steel window-type cage with low-friction guidance (CJ design)." }, { "q": "How does the 24172 bore code work?", "a": "The last two digits of 24172 are bore code 72, so 72 × 5 = 360 mm bore. The 600 mm OD and 243 mm width come from the ISO 15 dimension-series plan (dimension series 41 (medium OD, maximum width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the ECCJ/W33 suffix mean on 24172?", "a": "The suffix ECCJ/W33 reads ECCJ — the optimized, higher-capacity version of the CJ design, with a stamped sheet-steel window-type cage with low-friction guidance, plus W33 (outer-ring groove and three lubrication holes); CCK30/W33 is the 1:30 tapered-bore counterpart." }, { "q": "Can 24172 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 24172K30 variant be used instead?", "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24172 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "24172", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "24172-ECCK30J-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) execution on AOH24172 withdrawal sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24172", "24172 ECCJ/W33" ], "locale_variants": {} }, { "sku": "24176", "brand": "SKF", "manufacturer_designation": "SKF 24176 ECA/W33", "series": "24100-series", "type": "spherical_roller", "d_mm": 380, "D_mm": 620, "B_mm": 243, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass_machined_M1", "dynamic_load_kN": 5936, "static_load_kN": 9800, "fatigue_load_limit_kN": 710, "max_rpm": 530, "reference_speed_rpm": 360, "limiting_speed_rpm": 530, "weight_g": 300000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 24176 appears as 24176 ECA/W33: an open, double-row spherical roller bearing, self-aligning by virtue of the sphered outer raceway, sized 380×620×243 mm to the ISO 15 boundary plan. Numbering ties the bearing to its envelope: 24176 means spherical-roller type, dimension series 41, 380 mm bore — which is why the 620×243 mm outline swaps dimensionally with other ISO 15 bearings of the same code. CA executions here use a machined brass cage (ECA enhanced geometry) rather than pressed steel; specialist suffixes change the bearing materially and must be quoted in full, and the K/CCK tapered-bore variant is a separate order number. Speed planning uses two different ceilings: 360 r/min thermal reference and 530 r/min mechanical limiting speed. For relubrication, route the grease duct to the outer-ring W33 groove position where fitted, and purge until fresh grease appears at the seal — the 243 mm width across two roller rows needs the full charge.", "applications": [ "large mining crusher main shafts", "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 380 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24100-series series at 380 mm bore (620×243 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 530 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.", "Shaft and housing fillets must clear the bearing chamfer so the 243 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "Catalogue reference speed and limiting speed are different limits: the 360 r/min reference is a thermal criterion under load, while the 530 r/min limiting value is the mechanical ceiling — observe both.", "The 5936/9800 kN ratings are SKF catalogue values for this exact execution (24176 ECA/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 24176 (cylindrical bore as listed, tapered-bore 24176 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24176 ECA/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24176?", "a": "The 24176 ECA/W33 is a double-row spherical roller bearing with 380 mm bore, 620 mm outer diameter and 243 mm width (14.961 × 24.409 × 9.567 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 5936 kN, C0 9800 kN, fatigue load limit Pu 710 kN, reference speed 360 r/min, limiting speed 530 r/min, mass about 300000 g. It is an open, self-aligning bearing with a one-piece machined brass cage guided on the inner ring (CA design)." }, { "q": "How does the 24176 bore code work?", "a": "The last two digits of 24176 are bore code 76, so 76 × 5 = 380 mm bore. The 620 mm OD and 243 mm width come from the ISO 15 dimension-series plan (dimension series 41 (medium OD, maximum width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the ECA/W33 suffix mean on 24176?", "a": "The suffix ECA/W33 reads ECA — the enhanced version of the CA design with optimized internal geometry, plus W33 (annular groove and three lubrication holes in the outer ring for relubrication); CCK30/W33 is the 1:30 tapered-bore counterpart." }, { "q": "Can 24176 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 24176K30 variant be used instead?", "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24176 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "24176", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "24176-ECAK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) execution on AOH24176 withdrawal sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24176", "24176 ECA/W33" ], "locale_variants": {} }, { "sku": "24180", "brand": "SKF", "manufacturer_designation": "SKF 24180 ECA/W33", "series": "24100-series", "type": "spherical_roller", "d_mm": 400, "D_mm": 650, "B_mm": 250, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass_machined_M1", "dynamic_load_kN": 6331, "static_load_kN": 10600, "fatigue_load_limit_kN": 735, "max_rpm": 500, "reference_speed_rpm": 340, "limiting_speed_rpm": 500, "weight_g": 340000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number 24180 ECA/W33 in SKF catalogue PUB BU/P1 17000 denotes a double-row spherical roller bearing for a 400 mm shaft, dimension series 41 (medium OD, maximum width), with open execution and a one-piece machined brass cage guided on the inner ring (CA design). On the SKF nameplate, 24180 follows the ISO 15 convention: 2 for the spherical roller type, 41 for the dimension series 41 (medium OD, maximum width), final digits 80 for the 400 mm bore. CA executions here use a machined brass cage (ECA enhanced geometry) rather than pressed steel; specialist suffixes change the bearing materially and must be quoted in full, and the K/CCK tapered-bore variant is a separate order number. Catalogue mass 340000 g for the 400×650×250 mm open execution covers the a one-piece machined brass cage guided on the inner ring (CA design); tapered-bore and sealed variants differ in mass and carry their own order numbers. For relubrication, route the grease duct to the outer-ring W33 groove position where fitted, and purge until fresh grease appears at the seal — the 250 mm width across two roller rows needs the full charge.", "applications": [ "large dredger and marine winch drums", "steel-plant continuous-caster segments", "large induced-draft fan rotors", "SAG and ball-mill drive shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "At 400 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24100-series series at 400 mm bore (650×250 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 500 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 24180 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 6331/10600 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The 6331/10600 kN ratings are SKF catalogue values for this exact execution (24180 ECA/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 24180 (cylindrical bore as listed, tapered-bore 24180 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24180 ECA/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24180?", "a": "The 24180 ECA/W33 is a double-row spherical roller bearing with 400 mm bore, 650 mm outer diameter and 250 mm width (15.748 × 25.591 × 9.843 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 6331 kN, C0 10600 kN, fatigue load limit Pu 735 kN, reference speed 340 r/min, limiting speed 500 r/min, mass about 340000 g. It is an open, self-aligning bearing with a one-piece machined brass cage guided on the inner ring (CA design)." }, { "q": "How does the 24180 bore code work?", "a": "The last two digits of 24180 are bore code 80, so 80 × 5 = 400 mm bore. The 650 mm OD and 250 mm width come from the ISO 15 dimension-series plan (dimension series 41 (medium OD, maximum width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the ECA/W33 suffix mean on 24180?", "a": "The suffix ECA/W33 reads ECA — the enhanced version of the CA design with optimized internal geometry, plus W33 (annular groove and three lubrication holes in the outer ring for relubrication); CCK30/W33 is the 1:30 tapered-bore counterpart." }, { "q": "Can 24180 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 24180K30 variant be used instead?", "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24180 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "24180", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "24180-ECAK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) execution on AOH24180 withdrawal sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24180", "24180 ECA/W33" ], "locale_variants": {} }, { "sku": "24184", "brand": "SKF", "manufacturer_designation": "SKF 24184 ECA/W33", "series": "24100-series", "type": "spherical_roller", "d_mm": 420, "D_mm": 700, "B_mm": 280, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass_machined_M1", "dynamic_load_kN": 7577, "static_load_kN": 12500, "fatigue_load_limit_kN": 850, "max_rpm": 480, "reference_speed_rpm": 320, "limiting_speed_rpm": 480, "weight_g": 445000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "24184 ECA/W33 belongs to the SKF spherical roller range — the 420 mm bore entry in the 24100-series series (dimension series 41 (medium OD, maximum width)), dimensioned 700 mm OD and 280 mm wide. Numbering ties the bearing to its envelope: 24184 means spherical-roller type, dimension series 41, 420 mm bore — which is why the 700×280 mm outline swaps dimensionally with other ISO 15 bearings of the same code. CA executions here use a machined brass cage (ECA enhanced geometry) rather than pressed steel; specialist suffixes change the bearing materially and must be quoted in full, and the K/CCK tapered-bore variant is a separate order number. The 850 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.65 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. After mounting, swing the outer ring to confirm free self-alignment: the 24184 should tilt through its full catalogue misalignment range without binding; a stiff joint signals a cocked seat or shoulder interference.", "applications": [ "steel-plant continuous-caster segments", "large induced-draft fan rotors", "SAG and ball-mill drive shafts", "large mining crusher main shafts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "At 420 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24100-series series at 420 mm bore (700×280 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 480 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.", "Shaft and housing fillets must clear the bearing chamfer so the 280 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 7577/12500 kN ratings are SKF catalogue values for this exact execution (24184 ECA/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 24184 (cylindrical bore as listed, tapered-bore 24184 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24184 ECA/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24184?", "a": "The 24184 ECA/W33 is a double-row spherical roller bearing with 420 mm bore, 700 mm outer diameter and 280 mm width (16.535 × 27.559 × 11.024 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 7577 kN, C0 12500 kN, fatigue load limit Pu 850 kN, reference speed 320 r/min, limiting speed 480 r/min, mass about 445000 g. It is an open, self-aligning bearing with a one-piece machined brass cage guided on the inner ring (CA design)." }, { "q": "How does the 24184 bore code work?", "a": "The last two digits of 24184 are bore code 84, so 84 × 5 = 420 mm bore. The 700 mm OD and 280 mm width come from the ISO 15 dimension-series plan (dimension series 41 (medium OD, maximum width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the ECA/W33 suffix mean on 24184?", "a": "The suffix ECA/W33 reads ECA — the enhanced version of the CA design with optimized internal geometry, plus W33 (annular groove and three lubrication holes in the outer ring for relubrication); CCK30/W33 is the 1:30 tapered-bore counterpart." }, { "q": "Can 24184 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 24184K30 variant be used instead?", "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24184 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "24184", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "24184-ECAK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) execution on AOH24184 withdrawal sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24184", "24184 ECA/W33" ], "locale_variants": {} }, { "sku": "24188", "brand": "SKF", "manufacturer_designation": "SKF 24188 ECA/W33", "series": "24100-series", "type": "spherical_roller", "d_mm": 440, "D_mm": 720, "B_mm": 280, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass_machined_M1", "dynamic_load_kN": 7777, "static_load_kN": 13200, "fatigue_load_limit_kN": 900, "max_rpm": 450, "reference_speed_rpm": 300, "limiting_speed_rpm": 450, "weight_g": 460000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "24188 is a double-row spherical roller bearing in the 24100-series family: two rows of barrel rollers on a common sphered outer raceway, self-aligning under shaft deflection, listed by SKF in SKF catalogue PUB BU/P1 17000. Digit by digit, 24188 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 41, and bore reference 88 resolving to 440 mm; 720 mm OD and 280 mm width are the matching ISO 15 boundary values. CA executions here use a machined brass cage (ECA enhanced geometry) rather than pressed steel; specialist suffixes change the bearing materially and must be quoted in full, and the K/CCK tapered-bore variant is a separate order number. At 300 r/min reference speed the 140.0 mm-section 24188 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 450 r/min as the mechanical ceiling. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.", "applications": [ "large induced-draft fan rotors", "SAG and ball-mill drive shafts", "large mining crusher main shafts", "wind-turbine main shaft support" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "cage pocket wear or fracture from roller skew at insufficient minimum load or rapid acceleration", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "At 440 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24100-series series at 440 mm bore (720×280 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 450 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.", "Catalogue reference speed and limiting speed are different limits: the 300 r/min reference is a thermal criterion under load, while the 450 r/min limiting value is the mechanical ceiling — observe both.", "Shaft and housing fillets must clear the bearing chamfer so the 280 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 7777/13200 kN ratings are SKF catalogue values for this exact execution (24188 ECA/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 24188 (cylindrical bore as listed, tapered-bore 24188 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24188 ECA/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24188?", "a": "The 24188 ECA/W33 is a double-row spherical roller bearing with 440 mm bore, 720 mm outer diameter and 280 mm width (17.323 × 28.346 × 11.024 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 7777 kN, C0 13200 kN, fatigue load limit Pu 900 kN, reference speed 300 r/min, limiting speed 450 r/min, mass about 460000 g. It is an open, self-aligning bearing with a one-piece machined brass cage guided on the inner ring (CA design)." }, { "q": "How does the 24188 bore code work?", "a": "The last two digits of 24188 are bore code 88, so 88 × 5 = 440 mm bore. The 720 mm OD and 280 mm width come from the ISO 15 dimension-series plan (dimension series 41 (medium OD, maximum width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the ECA/W33 suffix mean on 24188?", "a": "The suffix ECA/W33 reads ECA — the enhanced version of the CA design with optimized internal geometry, plus W33 (annular groove and three lubrication holes in the outer ring for relubrication); CCK30/W33 is the 1:30 tapered-bore counterpart." }, { "q": "Can 24188 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 24188K30 variant be used instead?", "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24188 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "24188", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "24188-ECAK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) execution on AOH24188 withdrawal sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C4188-MB", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 4188 MB shares the 440×720×280 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C4188-K30MB", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 4188 K30MB shares the 440×720×280 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24188", "24188 ECA/W33" ], "locale_variants": {} }, { "sku": "24192", "brand": "SKF", "manufacturer_designation": "SKF 24192 ECA/W33", "series": "24100-series", "type": "spherical_roller", "d_mm": 460, "D_mm": 760, "B_mm": 300, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass_machined_M1", "dynamic_load_kN": 8608, "static_load_kN": 14600, "fatigue_load_limit_kN": 1000, "max_rpm": 430, "reference_speed_rpm": 280, "limiting_speed_rpm": 430, "weight_g": 560000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 460 mm shaft carrying heavy radial load with misalignment or deflection, SKF lists 24192 under catalogue execution 24192 ECA/W33: two barrel-roller rows on a sphered outer raceway. Numbering ties the bearing to its envelope: 24192 means spherical-roller type, dimension series 41, 460 mm bore — which is why the 760×300 mm outline swaps dimensionally with other ISO 15 bearings of the same code. CA executions here use a machined brass cage (ECA enhanced geometry) rather than pressed steel; specialist suffixes change the bearing materially and must be quoted in full, and the K/CCK tapered-bore variant is a separate order number. The 150.0 mm radial section height ((760−460)/2) and 560000 g catalogue mass frame a 460 mm bore bearing rated at 8608 kN C — roughly 18.71 kN of dynamic capacity per millimetre of bore before application factors. Spherical roller bearings are routinely specified with C3 clearance because the tight inner-ring fit and inner/outer temperature gradient eat into the CN running clearance — check the residual clearance after mounting with feeler gauges.", "applications": [ "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "steel-plant continuous-caster segments" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems" ], "pitfalls": [ "At 460 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24100-series series at 460 mm bore (760×300 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 430 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.", "Shaft and housing fillets must clear the bearing chamfer so the 300 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "Never use the tapered-bore CCK30/K30 variant's drive-up figures on this cylindrical-bore 24192; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 8608/14600 kN ratings are SKF catalogue values for this exact execution (24192 ECA/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 24192 (cylindrical bore as listed, tapered-bore 24192 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24192 ECA/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24192?", "a": "The 24192 ECA/W33 is a double-row spherical roller bearing with 460 mm bore, 760 mm outer diameter and 300 mm width (18.11 × 29.921 × 11.811 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 8608 kN, C0 14600 kN, fatigue load limit Pu 1000 kN, reference speed 280 r/min, limiting speed 430 r/min, mass about 560000 g. It is an open, self-aligning bearing with a one-piece machined brass cage guided on the inner ring (CA design)." }, { "q": "How does the 24192 bore code work?", "a": "The last two digits of 24192 are bore code 92, so 92 × 5 = 460 mm bore. The 760 mm OD and 300 mm width come from the ISO 15 dimension-series plan (dimension series 41 (medium OD, maximum width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the ECA/W33 suffix mean on 24192?", "a": "The suffix ECA/W33 reads ECA — the enhanced version of the CA design with optimized internal geometry, plus W33 (annular groove and three lubrication holes in the outer ring for relubrication); CCK30/W33 is the 1:30 tapered-bore counterpart." }, { "q": "Can 24192 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 24192K30 variant be used instead?", "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24192 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "24192", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "24192-ECAK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) execution on AOH24192 withdrawal sleeve; same ISO 15 envelope, separate order number." }, { "equiv_sku": "C4192-MB", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 4192 MB shares the 460×760×300 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C4192-K30MB", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 4192 K30MB shares the 460×760×300 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24192", "24192 ECA/W33" ], "locale_variants": {} }, { "sku": "24196", "brand": "SKF", "manufacturer_designation": "SKF 24196 ECA/W33", "series": "24100-series", "type": "spherical_roller", "d_mm": 480, "D_mm": 790, "B_mm": 308, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass_machined_M1", "dynamic_load_kN": 9198, "static_load_kN": 15600, "fatigue_load_limit_kN": 1040, "max_rpm": 400, "reference_speed_rpm": 260, "limiting_speed_rpm": 400, "weight_g": 605000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The 24196 ECA/W33 is a 480×790×308 mm spherical roller bearing — the dimension series 41 (medium OD, maximum width) entry for a 480 mm shaft, with two rows of symmetrical barrel rollers for combined radial and axial load. Digit by digit, 24196 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 41, and bore reference 96 resolving to 480 mm; 790 mm OD and 308 mm width are the matching ISO 15 boundary values. CA executions here use a machined brass cage (ECA enhanced geometry) rather than pressed steel; specialist suffixes change the bearing materially and must be quoted in full, and the K/CCK tapered-bore variant is a separate order number. With C 9198 kN and C0 15600 kN, the 24196 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. The cylindrical-bore execution here seats directly on the shaft journal; if the application calls for an adapter sleeve, order the tapered-bore 24196 CCK30/W33 variant instead and measure the drive-up or clearance reduction, not the nut torque.", "applications": [ "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "steel-plant continuous-caster segments", "large induced-draft fan rotors" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "stamped-steel cage fatigue after long service in high-vibration screening duty without the VA405 execution", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems" ], "pitfalls": [ "At 480 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24100-series series at 480 mm bore (790×308 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 400 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.", "Catalogue reference speed and limiting speed are different limits: the 260 r/min reference is a thermal criterion under load, while the 400 r/min limiting value is the mechanical ceiling — observe both.", "The 24196 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 9198/15600 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The 9198/15600 kN ratings are SKF catalogue values for this exact execution (24196 ECA/W33); SKF can revise internal geometry without changing the order number, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the specification and re-verify for critical drives.", "SKF lists several executions of 24196 (cylindrical bore as listed, tapered-bore 24196 CCK30/W33 variant, plus sealed and vibrating-screen options in the same envelope); they are not interchangeable order numbers — quote the full 24196 ECA/W33 designation when purchasing." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24196?", "a": "The 24196 ECA/W33 is a double-row spherical roller bearing with 480 mm bore, 790 mm outer diameter and 308 mm width (18.898 × 31.102 × 12.126 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 9198 kN, C0 15600 kN, fatigue load limit Pu 1040 kN, reference speed 260 r/min, limiting speed 400 r/min, mass about 605000 g. It is an open, self-aligning bearing with a one-piece machined brass cage guided on the inner ring (CA design)." }, { "q": "How does the 24196 bore code work?", "a": "The last two digits of 24196 are bore code 96, so 96 × 5 = 480 mm bore. The 790 mm OD and 308 mm width come from the ISO 15 dimension-series plan (dimension series 41 (medium OD, maximum width)), shared with other spherical roller bearings of the same code." }, { "q": "What does the ECA/W33 suffix mean on 24196?", "a": "The suffix ECA/W33 reads ECA — the enhanced version of the CA design with optimized internal geometry, plus W33 (annular groove and three lubrication holes in the outer ring for relubrication); CCK30/W33 is the 1:30 tapered-bore counterpart." }, { "q": "Can 24196 accommodate misalignment and axial load?", "a": "Yes on both counts. The sphered outer raceway lets the bearing self-align ≈ 0.5–2.5° depending on series, absorbing shaft deflection and housing-seat errors. The two barrel-roller rows also carry bidirectional axial load in addition to heavy radial load — this is the key difference from cylindrical roller bearings, which take no axial load." }, { "q": "When should the tapered-bore 24196K30 variant be used instead?", "a": "Choose the K30 (1:30 tapered bore) variant when the bearing must seat on an adapter or withdrawal sleeve — typical for long shafts, frequent dismounting, or stepped shafts where machining a precision journal is impractical. Sleeve mounting requires measuring clearance reduction or axial drive-up, not nut torque. The cylindrical-bore 24196 listed here seats directly on a machined journal." } ], "cross_ref": [ { "equiv_sku": "24196", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; D/B cross-verified against Schaeffler HR1 2022; standard interchange — confirm clearance class and precision with the supplier." }, { "equiv_sku": "24196-ECAK30-W33", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) execution on AOH24196 withdrawal sleeve; same ISO 15 envelope, separate order number." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.1 spherical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24196", "24196 ECA/W33" ], "locale_variants": {} }, { "sku": "22205-EK", "brand": "SKF", "manufacturer_designation": "SKF 22205 EK", "series": "22200-series", "type": "spherical_roller", "d_mm": 25, "D_mm": 52, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 49.9, "static_load_kN": 44, "fatigue_load_limit_kN": 4.75, "max_rpm": 17000, "reference_speed_rpm": 13000, "limiting_speed_rpm": 17000, "weight_g": 330, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "22205-ek is the 1:12 tapered-bore execution of the 22200-series spherical roller bearing: the same two barrel-roller rows on a sphered outer raceway as 22205, but the inner-ring bore tapers 1 mm per 12 mm for adapter- or withdrawal-sleeve mounting, as listed by SKF in SKF catalogue PUB BU/P1 17000. Reading the designation: the leading 2 marks a spherical roller bearing, the 22 is the ISO 15 dimension series (dimension series 22 (medium OD, wide)), and the last two digits encode the 25 mm bore; the 52 mm OD and 18 mm width follow the ISO 15 general plan. The K in the designation marks the 1:12 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. Selection arithmetic: the C0/C ratio is about 0.88 (static 44 kN against dynamic 49.9 kN), typical of a spherical roller sized for heavy combined loads, and the 4.75 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. For shafts with a locating shoulder, use an AH withdrawal sleeve instead of an adapter sleeve: the bearing presses against the shoulder and the sleeve is drawn out for dismounting, making the 22205-ek removable without an induction heater.", "applications": [ "small vibrating screens and sieve shafts", "agricultural elevator and auger shafts", "fan and pulley shafts that need periodic bearing removal in the field", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems" ], "pitfalls": [ "At a 25 mm bore the small barrel rollers skid readily at light load; keep the radial load above the minimum (roughly 0.01·C0) and avoid long idling at speed — unloaded 22205-ek rows scuff the raceway before fatigue ever shows.", "The 22200-series series at 25 mm bore (52×18 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.", "The 22205-ek and its cylindrical-bore counterpart 22205 share envelope and load ratings (49.9/44 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "The adapter sleeve is selected by actual shaft diameter, not by the 25 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 22205-ek with different sleeves.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 49.9/44 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22205 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22205-ek?", "a": "The SKF 22205 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 25 mm nominal bore, 52 mm outer diameter and 18 mm width (0.984 × 2.047 × 0.709 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 49.9 kN, C0 44 kN, Pu 4.75 kN, reference speed 13,000 r/min, limiting speed 17,000 r/min, mass about 330 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 22205-ek?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 22205-ek?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 25 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 22205-ek driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 22205-ek and 22205?", "a": "They share the ISO 15 envelope and the same 49.9/44 kN ratings, but 22205-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22205 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "22205", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 22205; identical ISO 15 envelope, fits H305 adapter sleeve on a 20 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22205-EK", "SKF 22205 EK", "22205 K" ], "locale_variants": {} }, { "sku": "22206-EK", "brand": "SKF", "manufacturer_designation": "SKF 22206 EK", "series": "22200-series", "type": "spherical_roller", "d_mm": 30, "D_mm": 62, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 66.1, "static_load_kN": 60, "fatigue_load_limit_kN": 6.4, "max_rpm": 14000, "reference_speed_rpm": 10000, "limiting_speed_rpm": 14000, "weight_g": 390, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For sleeve mounting on a 30 mm shaft, SKF order number SKF 22206 EK is the 1:12 tapered-bore spherical roller bearing in the 22200-series family (dimension series 22 (medium OD, wide)); the cylindrical-bore equivalent is a separate order number, 22206. On the SKF nameplate, 22206-ek follows the ISO 15 convention: 2 for the spherical roller type, 22 for the dimension series 22 (medium OD, wide), final digits 06 for the 30 mm bore. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. At 10,000 r/min reference speed the 16.0 mm-section 22206-ek is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 14,000 r/min as the mechanical ceiling. Over-driving the 22206-ek up its sleeve pinches radial clearance below the residual minimum and can crack the inner ring in service; under-driving leaves the sleeve seat loose, so the ring creeps and frets the sleeve — measure, do not estimate.", "applications": [ "extruder gearbox shafts", "vibrating screen and scalper main shafts", "fan and pulley shafts that need periodic bearing removal in the field", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still" ], "pitfalls": [ "On this 30 mm bore, an interference inner-ring fit consumes a large share of the CN clearance; specify C3 when the inner ring rotates hot, and verify residual clearance after mounting rather than trusting the catalogue clearance class.", "The 22200-series series at 30 mm bore (62×20 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 20 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "The 22206-ek and its cylindrical-bore counterpart 22206 share envelope and load ratings (66.1/60 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "Catalogue reference speed and limiting speed are different limits: the 10,000 r/min reference is a thermal criterion under load, while the 14,000 r/min limiting value is the mechanical ceiling — observe both.", "The 66.1/60 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22206 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22206-ek?", "a": "The SKF 22206 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 30 mm nominal bore, 62 mm outer diameter and 20 mm width (1.181 × 2.441 × 0.787 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 66.1 kN, C0 60 kN, Pu 6.4 kN, reference speed 10,000 r/min, limiting speed 14,000 r/min, mass about 390 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 22206-ek?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 22206-ek?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 30 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 22206-ek driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 22206-ek and 22206?", "a": "They share the ISO 15 envelope and the same 66.1/60 kN ratings, but 22206-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22206 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "22206", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 22206; identical ISO 15 envelope, fits H306 adapter sleeve on a 25 mm shaft." }, { "equiv_sku": "C2206-TN9", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2206 TN9 shares the 30×62×20 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C2206-KTN9", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2206 KTN9 shares the 30×62×20 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C2206-V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2206 V shares the 30×62×20 mm envelope but catalogue C/C0 differ (76.5/71 kN vs 66.1/60 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22206-EK", "SKF 22206 EK", "22206 K" ], "locale_variants": {} }, { "sku": "22207-EK", "brand": "SKF", "manufacturer_designation": "SKF 22207 EK", "series": "22200-series", "type": "spherical_roller", "d_mm": 35, "D_mm": 72, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 88.8, "static_load_kN": 85, "fatigue_load_limit_kN": 9.3, "max_rpm": 12000, "reference_speed_rpm": 9000, "limiting_speed_rpm": 12000, "weight_g": 590, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 22207-ek denotes the tapered-bore version (K suffix, taper 1:12) of the 22200-series spherical roller bearing: dimensioned 35×72×23 mm, it seats on an adapter or withdrawal sleeve rather than directly on a machined journal. The code breaks down as type digit 2 (double-row spherical roller), dimension series 22 (dimension series 22 (medium OD, wide)), and bore code 07 = 35 mm; dimensions 35×72×23 mm therefore match the ISO 15 envelope. The K in the designation marks the 1:12 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. Catalogue mass 590 g for the 35×72×23 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. On an H adapter sleeve the 35 mm shaft seat only needs an h9 plain journal; slide the sleeve into the 22207-ek inner ring, tighten the KM nut against the MB washer until the catalogue clearance-reduction value is reached, then lock the washer tab.", "applications": [ "hammer-mill and crusher rotors", "continuous-caster guide rolls", "fan and pulley shafts that need periodic bearing removal in the field", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "On this 35 mm bore, an interference inner-ring fit consumes a large share of the CN clearance; specify C3 when the inner ring rotates hot, and verify residual clearance after mounting rather than trusting the catalogue clearance class.", "The 22200-series series at 35 mm bore (72×23 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 22207-ek to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "The adapter sleeve is selected by actual shaft diameter, not by the 35 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 22207-ek with different sleeves.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 22207-ek pits long before its L10 life.", "The 88.8/85 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22207 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22207-ek?", "a": "The SKF 22207 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 35 mm nominal bore, 72 mm outer diameter and 23 mm width (1.378 × 2.835 × 0.906 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 88.8 kN, C0 85 kN, Pu 9.3 kN, reference speed 9,000 r/min, limiting speed 12,000 r/min, mass about 590 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 22207-ek?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 22207-ek?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 35 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 22207-ek driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 22207-ek and 22207?", "a": "They share the ISO 15 envelope and the same 88.8/85 kN ratings, but 22207-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22207 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "22207", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 22207; identical ISO 15 envelope, fits H307 adapter sleeve on a 30 mm shaft." }, { "equiv_sku": "C2207-TN9", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2207 TN9 shares the 35×72×23 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C2207-KTN9", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2207 KTN9 shares the 35×72×23 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C2207-V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2207 V shares the 35×72×23 mm envelope but catalogue C/C0 differ (95/96 kN vs 88.8/85 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22207-EK", "SKF 22207 EK", "22207 K" ], "locale_variants": {} }, { "sku": "22208-EK", "brand": "SKF", "manufacturer_designation": "SKF 22208 EK", "series": "22200-series", "type": "spherical_roller", "d_mm": 40, "D_mm": 80, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 98.5, "static_load_kN": 90, "fatigue_load_limit_kN": 9.8, "max_rpm": 11000, "reference_speed_rpm": 8000, "limiting_speed_rpm": 11000, "weight_g": 680, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "22208-ek is the 1:12 tapered-bore execution of the 22200-series spherical roller bearing: the same two barrel-roller rows on a sphered outer raceway as 22208, but the inner-ring bore tapers 1 mm per 12 mm for adapter- or withdrawal-sleeve mounting, as listed by SKF in SKF catalogue PUB BU/P1 17000. Numbering ties the bearing to its envelope: 22208-ek means spherical-roller type, dimension series 22, 40 mm bore — which is why the 80×23 mm outline swaps dimensionally with other ISO 15 bearings of the same code. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. Catalogue mass 680 g for the 40×80×23 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. On an H adapter sleeve the 40 mm shaft seat only needs an h9 plain journal; slide the sleeve into the 22208-ek inner ring, tighten the KM nut against the MB washer until the catalogue clearance-reduction value is reached, then lock the washer tab.", "applications": [ "hammer-mill and crusher rotors", "continuous-caster guide rolls", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat", "split-housing plummer block arrangements with bearings swapped in situ" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals" ], "pitfalls": [ "On this 40 mm bore, an interference inner-ring fit consumes a large share of the CN clearance; specify C3 when the inner ring rotates hot, and verify residual clearance after mounting rather than trusting the catalogue clearance class.", "The 22200-series series at 40 mm bore (80×23 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.", "The 22208-ek and its cylindrical-bore counterpart 22208 share envelope and load ratings (98.5/90 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 22208-ek to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "Catalogue reference speed and limiting speed are different limits: the 8,000 r/min reference is a thermal criterion under load, while the 11,000 r/min limiting value is the mechanical ceiling — observe both.", "The 98.5/90 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22208 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22208-ek?", "a": "The SKF 22208 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 40 mm nominal bore, 80 mm outer diameter and 23 mm width (1.575 × 3.15 × 0.906 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 98.5 kN, C0 90 kN, Pu 9.8 kN, reference speed 8,000 r/min, limiting speed 11,000 r/min, mass about 680 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 22208-ek?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 22208-ek?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 40 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 22208-ek driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 22208-ek and 22208?", "a": "They share the ISO 15 envelope and the same 98.5/90 kN ratings, but 22208-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22208 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "22208", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 22208; identical ISO 15 envelope, fits H308 adapter sleeve on a 35 mm shaft." }, { "equiv_sku": "C2208-TN9", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2208 TN9 shares the 40×80×23 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C2208-KTN9", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2208 KTN9 shares the 40×80×23 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C2208-V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2208 V shares the 40×80×23 mm envelope but catalogue C/C0 differ (102/104 kN vs 98.5/90 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22208-EK", "SKF 22208 EK", "22208 K" ], "locale_variants": {} }, { "sku": "22308-EK", "brand": "SKF", "manufacturer_designation": "SKF 22308 EK", "series": "22300-series", "type": "spherical_roller", "d_mm": 40, "D_mm": 90, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 155, "static_load_kN": 140, "fatigue_load_limit_kN": 15, "max_rpm": 8000, "reference_speed_rpm": 6000, "limiting_speed_rpm": 8000, "weight_g": 1250, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For sleeve mounting on a 40 mm shaft, SKF order number SKF 22308 EK is the 1:12 tapered-bore spherical roller bearing in the 22300-series family (dimension series 23 (heavy OD, wide)); the cylindrical-bore equivalent is a separate order number, 22308. On the SKF nameplate, 22308-ek follows the ISO 15 convention: 2 for the spherical roller type, 23 for the dimension series 23 (heavy OD, wide), final digits 08 for the 40 mm bore. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. Selection arithmetic: the C0/C ratio is about 0.90 (static 140 kN against dynamic 155 kN), typical of a spherical roller sized for heavy combined loads, and the 15 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. At 40 mm bore, dismount after service is by KM locknut reversal or a hydraulic nut on larger sizes; oil-injection grooves on the bigger sleeves let pressurised oil float the 22308-ek off the taper without scoring either surface.", "applications": [ "vibrating screen and scalper main shafts", "conveyor drive and bend pulleys", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals" ], "pitfalls": [ "On this 40 mm bore, an interference inner-ring fit consumes a large share of the CN clearance; specify C3 when the inner ring rotates hot, and verify residual clearance after mounting rather than trusting the catalogue clearance class.", "The 22300-series series at 40 mm bore (90×33 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 8,000 r/min ceiling.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 33 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 22308-ek to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 22308-ek pits long before its L10 life.", "The 155/140 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22308 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22308-ek?", "a": "The SKF 22308 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 40 mm nominal bore, 90 mm outer diameter and 33 mm width (1.575 × 3.543 × 1.299 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 155 kN, C0 140 kN, Pu 15 kN, reference speed 6,000 r/min, limiting speed 8,000 r/min, mass about 1250 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 22308-ek?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 22308-ek?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 40 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 22308-ek driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 22308-ek and 22308?", "a": "They share the ISO 15 envelope and the same 155/140 kN ratings, but 22308-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22308 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "22308", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 22308; identical ISO 15 envelope, fits H2308 adapter sleeve on a 35 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22308-EK", "SKF 22308 EK", "22308 K" ], "locale_variants": {} }, { "sku": "22209-EK", "brand": "SKF", "manufacturer_designation": "SKF 22209 EK", "series": "22200-series", "type": "spherical_roller", "d_mm": 45, "D_mm": 85, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 104, "static_load_kN": 98, "fatigue_load_limit_kN": 10.8, "max_rpm": 10000, "reference_speed_rpm": 7500, "limiting_speed_rpm": 10000, "weight_g": 810, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For sleeve mounting on a 45 mm shaft, SKF order number SKF 22209 EK is the 1:12 tapered-bore spherical roller bearing in the 22200-series family (dimension series 22 (medium OD, wide)); the cylindrical-bore equivalent is a separate order number, 22209. Reading the designation: the leading 2 marks a spherical roller bearing, the 22 is the ISO 15 dimension series (dimension series 22 (medium OD, wide)), and the last two digits encode the 45 mm bore; the 85 mm OD and 23 mm width follow the ISO 15 general plan. Reading the suffix on 22209-ek, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 22209. With C 104 kN and C0 98 kN, the 22209-ek load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. Mounting on the 1:12 taper is controlled by clearance reduction or measured axial drive-up, never by locknut torque: SKF tables give the target radial-clearance decrease for the 45 mm 22209-ek, checked with feeler gauges before and after drive-up.", "applications": [ "centrifugal pump and fan shafts", "hammer-mill and crusher rotors", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat", "split-housing plummer block arrangements with bearings swapped in situ" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "smearing on the roller-raceway contact during skid starts below the minimum load" ], "pitfalls": [ "On this 45 mm bore, an interference inner-ring fit consumes a large share of the CN clearance; specify C3 when the inner ring rotates hot, and verify residual clearance after mounting rather than trusting the catalogue clearance class.", "The 22200-series series at 45 mm bore (85×23 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 23 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 23 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 22209-ek pits long before its L10 life.", "The 104/98 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22209 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22209-ek?", "a": "The SKF 22209 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 45 mm nominal bore, 85 mm outer diameter and 23 mm width (1.772 × 3.346 × 0.906 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 104 kN, C0 98 kN, Pu 10.8 kN, reference speed 7,500 r/min, limiting speed 10,000 r/min, mass about 810 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 22209-ek?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 22209-ek?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 45 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 22209-ek driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 22209-ek and 22209?", "a": "They share the ISO 15 envelope and the same 104/98 kN ratings, but 22209-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22209 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "22209", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 22209; identical ISO 15 envelope, fits H309 adapter sleeve on a 40 mm shaft." }, { "equiv_sku": "C2209-TN9", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2209 TN9 shares the 45×85×23 mm envelope but catalogue C/C0 differ (93/93 kN vs 104/98 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C2209-KTN9", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2209 KTN9 shares the 45×85×23 mm envelope but catalogue C/C0 differ (93/93 kN vs 104/98 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C2209-V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2209 V shares the 45×85×23 mm envelope but catalogue C/C0 differ (106/110 kN vs 104/98 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22209-EK", "SKF 22209 EK", "22209 K" ], "locale_variants": {} }, { "sku": "22309-EK", "brand": "SKF", "manufacturer_designation": "SKF 22309 EK", "series": "22300-series", "type": "spherical_roller", "d_mm": 45, "D_mm": 100, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 190, "static_load_kN": 183, "fatigue_load_limit_kN": 19.6, "max_rpm": 7000, "reference_speed_rpm": 5300, "limiting_speed_rpm": 7000, "weight_g": 1700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 22309-ek denotes the tapered-bore version (K suffix, taper 1:12) of the 22300-series spherical roller bearing: dimensioned 45×100×36 mm, it seats on an adapter or withdrawal sleeve rather than directly on a machined journal. Digit by digit, 22309-ek reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 23, and bore reference 09 resolving to 45 mm; 100 mm OD and 36 mm width are the matching ISO 15 boundary values. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. Selection arithmetic: the C0/C ratio is about 0.96 (static 183 kN against dynamic 190 kN), typical of a spherical roller sized for heavy combined loads, and the 19.6 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. At 45 mm bore, dismount after service is by KM locknut reversal or a hydraulic nut on larger sizes; oil-injection grooves on the bigger sleeves let pressurised oil float the 22309-ek off the taper without scoring either surface.", "applications": [ "vibrating screen and scalper main shafts", "conveyor drive and bend pulleys", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "On this 45 mm bore, an interference inner-ring fit consumes a large share of the CN clearance; specify C3 when the inner ring rotates hot, and verify residual clearance after mounting rather than trusting the catalogue clearance class.", "The 22300-series series at 45 mm bore (100×36 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 7,000 r/min ceiling.", "The adapter sleeve is selected by actual shaft diameter, not by the 45 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 22309-ek with different sleeves.", "The 22309-ek and its cylindrical-bore counterpart 22309 share envelope and load ratings (190/183 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "Catalogue reference speed and limiting speed are different limits: the 5,300 r/min reference is a thermal criterion under load, while the 7,000 r/min limiting value is the mechanical ceiling — observe both.", "The 190/183 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22309 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22309-ek?", "a": "The SKF 22309 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 45 mm nominal bore, 100 mm outer diameter and 36 mm width (1.772 × 3.937 × 1.417 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 190 kN, C0 183 kN, Pu 19.6 kN, reference speed 5,300 r/min, limiting speed 7,000 r/min, mass about 1700 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 22309-ek?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 22309-ek?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 45 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 22309-ek driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 22309-ek and 22309?", "a": "They share the ISO 15 envelope and the same 190/183 kN ratings, but 22309-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22309 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "22309", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 22309; identical ISO 15 envelope, fits H2309 adapter sleeve on a 40 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22309-EK", "SKF 22309 EK", "22309 K" ], "locale_variants": {} }, { "sku": "22210-EK", "brand": "SKF", "manufacturer_designation": "SKF 22210 EK", "series": "22200-series", "type": "spherical_roller", "d_mm": 50, "D_mm": 90, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 107, "static_load_kN": 108, "fatigue_load_limit_kN": 11.8, "max_rpm": 9500, "reference_speed_rpm": 7000, "limiting_speed_rpm": 9500, "weight_g": 900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 22210-ek denotes the tapered-bore version (K suffix, taper 1:12) of the 22200-series spherical roller bearing: dimensioned 50×90×23 mm, it seats on an adapter or withdrawal sleeve rather than directly on a machined journal. Numbering ties the bearing to its envelope: 22210-ek means spherical-roller type, dimension series 22, 50 mm bore — which is why the 90×23 mm outline swaps dimensionally with other ISO 15 bearings of the same code. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. The 11.8 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.01 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. Because driving up the 1:12 taper consumes radial clearance, K executions are commonly ordered with C3 initial clearance so the residual running clearance after mounting matches the cylindrical-bore 22210 on an interference seat.", "applications": [ "continuous-caster guide rolls", "extruder gearbox shafts", "split-housing plummer block arrangements with bearings swapped in situ", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "On this 50 mm bore, an interference inner-ring fit consumes a large share of the CN clearance; specify C3 when the inner ring rotates hot, and verify residual clearance after mounting rather than trusting the catalogue clearance class.", "The 22200-series series at 50 mm bore (90×23 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.", "The adapter sleeve is selected by actual shaft diameter, not by the 50 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 22210-ek with different sleeves.", "The 22210-ek and its cylindrical-bore counterpart 22210 share envelope and load ratings (107/108 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "The 22210-ek shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 107/108 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The 107/108 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22210 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22210-ek?", "a": "The SKF 22210 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 50 mm nominal bore, 90 mm outer diameter and 23 mm width (1.969 × 3.543 × 0.906 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 107 kN, C0 108 kN, Pu 11.8 kN, reference speed 7,000 r/min, limiting speed 9,500 r/min, mass about 900 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 22210-ek?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 22210-ek?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 50 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 22210-ek driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 22210-ek and 22210?", "a": "They share the ISO 15 envelope and the same 107/108 kN ratings, but 22210-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22210 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "22210", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 22210; identical ISO 15 envelope, fits H310 adapter sleeve on a 45 mm shaft." }, { "equiv_sku": "C2210-TN9", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2210 TN9 shares the 50×90×23 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C2210-KTN9", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2210 KTN9 shares the 50×90×23 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C2210-V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2210 V shares the 50×90×23 mm envelope but catalogue C/C0 differ (114/122 kN vs 107/108 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22210-EK", "SKF 22210 EK", "22210 K" ], "locale_variants": {} }, { "sku": "21310-EK", "brand": "SKF", "manufacturer_designation": "SKF 21310 EK", "series": "21300-series", "type": "spherical_roller", "d_mm": 50, "D_mm": 110, "B_mm": 27, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 159, "static_load_kN": 166, "fatigue_load_limit_kN": 18.6, "max_rpm": 7500, "reference_speed_rpm": 5600, "limiting_speed_rpm": 7500, "weight_g": 1600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For sleeve mounting on a 50 mm shaft, SKF order number SKF 21310 EK is the 1:12 tapered-bore spherical roller bearing in the 21300-series family (dimension series 13 (heavy OD, normal width)); the cylindrical-bore equivalent is a separate order number, 21310. Numbering ties the bearing to its envelope: 21310-ek means spherical-roller type, dimension series 13, 50 mm bore — which is why the 110×27 mm outline swaps dimensionally with other ISO 15 bearings of the same code. The K in the designation marks the 1:12 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. Selection arithmetic: the C0/C ratio is about 1.04 (static 166 kN against dynamic 159 kN), typical of a spherical roller sized for heavy combined loads, and the 18.6 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Over-driving the 21310-ek up its sleeve pinches radial clearance below the residual minimum and can crack the inner ring in service; under-driving leaves the sleeve seat loose, so the ring creeps and frets the sleeve — measure, do not estimate.", "applications": [ "vibrating screen and scalper main shafts", "conveyor drive and bend pulleys", "fan and pulley shafts that need periodic bearing removal in the field", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems" ], "pitfalls": [ "On this 50 mm bore, an interference inner-ring fit consumes a large share of the CN clearance; specify C3 when the inner ring rotates hot, and verify residual clearance after mounting rather than trusting the catalogue clearance class.", "The 21300-series series at 50 mm bore (110×27 mm) pairs a heavy OD with a narrow section — a compact way to add capacity, but the shoulder and abutment diameters differ from the 222 series; it is not a drop-in swap.", "The 21310-ek and its cylindrical-bore counterpart 21310 share envelope and load ratings (159/166 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "The 21310-ek and its cylindrical-bore counterpart 21310 share envelope and load ratings (159/166 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 159/166 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 21310 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 21310-ek?", "a": "The SKF 21310 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 50 mm nominal bore, 110 mm outer diameter and 27 mm width (1.969 × 4.331 × 1.063 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 159 kN, C0 166 kN, Pu 18.6 kN, reference speed 5,600 r/min, limiting speed 7,500 r/min, mass about 1600 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 21310-ek?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 21310-ek?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 50 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 21310-ek driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 21310-ek and 21310?", "a": "They share the ISO 15 envelope and the same 159/166 kN ratings, but 21310-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 21310 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "21310", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 21310; identical ISO 15 envelope, fits H310 adapter sleeve on a 45 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "21310-EK", "SKF 21310 EK", "21310 K" ], "locale_variants": {} }, { "sku": "22310-EK", "brand": "SKF", "manufacturer_designation": "SKF 22310 EK", "series": "22300-series", "type": "spherical_roller", "d_mm": 50, "D_mm": 110, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 228, "static_load_kN": 224, "fatigue_load_limit_kN": 24, "max_rpm": 6300, "reference_speed_rpm": 4800, "limiting_speed_rpm": 6300, "weight_g": 2250, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "22310-ek is the 1:12 tapered-bore execution of the 22300-series spherical roller bearing: the same two barrel-roller rows on a sphered outer raceway as 22310, but the inner-ring bore tapers 1 mm per 12 mm for adapter- or withdrawal-sleeve mounting, as listed by SKF in SKF catalogue PUB BU/P1 17000. Digit by digit, 22310-ek reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 23, and bore reference 10 resolving to 50 mm; 110 mm OD and 40 mm width are the matching ISO 15 boundary values. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. Selection arithmetic: the C0/C ratio is about 0.98 (static 224 kN against dynamic 228 kN), typical of a spherical roller sized for heavy combined loads, and the 24 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Over-driving the 22310-ek up its sleeve pinches radial clearance below the residual minimum and can crack the inner ring in service; under-driving leaves the sleeve seat loose, so the ring creeps and frets the sleeve — measure, do not estimate.", "applications": [ "vibrating screen and scalper main shafts", "conveyor drive and bend pulleys", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "On this 50 mm bore, an interference inner-ring fit consumes a large share of the CN clearance; specify C3 when the inner ring rotates hot, and verify residual clearance after mounting rather than trusting the catalogue clearance class.", "The 22300-series series at 50 mm bore (110×40 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 6,300 r/min ceiling.", "The 22310-ek and its cylindrical-bore counterpart 22310 share envelope and load ratings (228/224 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "The 22310-ek and its cylindrical-bore counterpart 22310 share envelope and load ratings (228/224 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "Shaft and housing fillets must clear the bearing chamfer so the 40 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 228/224 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22310 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22310-ek?", "a": "The SKF 22310 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 50 mm nominal bore, 110 mm outer diameter and 40 mm width (1.969 × 4.331 × 1.575 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 228 kN, C0 224 kN, Pu 24 kN, reference speed 4,800 r/min, limiting speed 6,300 r/min, mass about 2250 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 22310-ek?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 22310-ek?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 50 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 22310-ek driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 22310-ek and 22310?", "a": "They share the ISO 15 envelope and the same 228/224 kN ratings, but 22310-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22310 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "22310", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 22310; identical ISO 15 envelope, fits H2310 adapter sleeve on a 45 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22310-EK", "SKF 22310 EK", "22310 K" ], "locale_variants": {} }, { "sku": "22211-EK", "brand": "SKF", "manufacturer_designation": "SKF 22211 EK", "series": "22200-series", "type": "spherical_roller", "d_mm": 55, "D_mm": 100, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 129, "static_load_kN": 127, "fatigue_load_limit_kN": 13.7, "max_rpm": 8500, "reference_speed_rpm": 6300, "limiting_speed_rpm": 8500, "weight_g": 1100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "22211-ek is the 1:12 tapered-bore execution of the 22200-series spherical roller bearing: the same two barrel-roller rows on a sphered outer raceway as 22211, but the inner-ring bore tapers 1 mm per 12 mm for adapter- or withdrawal-sleeve mounting, as listed by SKF in SKF catalogue PUB BU/P1 17000. Reading the designation: the leading 2 marks a spherical roller bearing, the 22 is the ISO 15 dimension series (dimension series 22 (medium OD, wide)), and the last two digits encode the 55 mm bore; the 100 mm OD and 25 mm width follow the ISO 15 general plan. The K in the designation marks the 1:12 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. Catalogue mass 1100 g for the 55×100×25 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. After drive-up, re-check radial clearance and then swing the outer ring through its self-aligning range: the sphered raceway of the 22211-ek must still tilt ≈ 0.5–2.5° freely — a joint that binds after sleeve mounting signals excessive drive-up or a cocked sleeve.", "applications": [ "hammer-mill and crusher rotors", "continuous-caster guide rolls", "split-housing plummer block arrangements with bearings swapped in situ", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems" ], "pitfalls": [ "On this 55 mm bore, an interference inner-ring fit consumes a large share of the CN clearance; specify C3 when the inner ring rotates hot, and verify residual clearance after mounting rather than trusting the catalogue clearance class.", "The 22200-series series at 55 mm bore (100×25 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 22211-ek to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "The adapter sleeve is selected by actual shaft diameter, not by the 55 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 22211-ek with different sleeves.", "Shaft and housing fillets must clear the bearing chamfer so the 25 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 129/127 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22211 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22211-ek?", "a": "The SKF 22211 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 55 mm nominal bore, 100 mm outer diameter and 25 mm width (2.165 × 3.937 × 0.984 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 129 kN, C0 127 kN, Pu 13.7 kN, reference speed 6,300 r/min, limiting speed 8,500 r/min, mass about 1100 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 22211-ek?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 22211-ek?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 55 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 22211-ek driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 22211-ek and 22211?", "a": "They share the ISO 15 envelope and the same 129/127 kN ratings, but 22211-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22211 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "22211", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 22211; identical ISO 15 envelope, fits H311 adapter sleeve on a 50 mm shaft." }, { "equiv_sku": "C2211-TN9", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2211 TN9 shares the 55×100×25 mm envelope but catalogue C/C0 differ (116/114 kN vs 129/127 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C2211-KTN9", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2211 KTN9 shares the 55×100×25 mm envelope but catalogue C/C0 differ (116/114 kN vs 129/127 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C2211-V", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2211 V shares the 55×100×25 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C2211-KV", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2211 KV shares the 55×100×25 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22211-EK", "SKF 22211 EK", "22211 K" ], "locale_variants": {} }, { "sku": "21311-EK", "brand": "SKF", "manufacturer_designation": "SKF 21311 EK", "series": "21300-series", "type": "spherical_roller", "d_mm": 55, "D_mm": 120, "B_mm": 29, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 159, "static_load_kN": 166, "fatigue_load_limit_kN": 18.6, "max_rpm": 7500, "reference_speed_rpm": 5600, "limiting_speed_rpm": 7500, "weight_g": 1950, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 21311-ek denotes the tapered-bore version (K suffix, taper 1:12) of the 21300-series spherical roller bearing: dimensioned 55×120×29 mm, it seats on an adapter or withdrawal sleeve rather than directly on a machined journal. Reading the designation: the leading 2 marks a spherical roller bearing, the 13 is the ISO 15 dimension series (dimension series 13 (heavy OD, normal width)), and the last two digits encode the 55 mm bore; the 120 mm OD and 29 mm width follow the ISO 15 general plan. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. Selection arithmetic: the C0/C ratio is about 1.04 (static 166 kN against dynamic 159 kN), typical of a spherical roller sized for heavy combined loads, and the 18.6 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Over-driving the 21311-ek up its sleeve pinches radial clearance below the residual minimum and can crack the inner ring in service; under-driving leaves the sleeve seat loose, so the ring creeps and frets the sleeve — measure, do not estimate.", "applications": [ "vibrating screen and scalper main shafts", "conveyor drive and bend pulleys", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat", "split-housing plummer block arrangements with bearings swapped in situ" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "On this 55 mm bore, an interference inner-ring fit consumes a large share of the CN clearance; specify C3 when the inner ring rotates hot, and verify residual clearance after mounting rather than trusting the catalogue clearance class.", "The 21300-series series at 55 mm bore (120×29 mm) pairs a heavy OD with a narrow section — a compact way to add capacity, but the shoulder and abutment diameters differ from the 222 series; it is not a drop-in swap.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 29 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 29 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 21311-ek; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 159/166 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 21311 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 21311-ek?", "a": "The SKF 21311 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 55 mm nominal bore, 120 mm outer diameter and 29 mm width (2.165 × 4.724 × 1.142 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 159 kN, C0 166 kN, Pu 18.6 kN, reference speed 5,600 r/min, limiting speed 7,500 r/min, mass about 1950 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 21311-ek?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 21311-ek?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 55 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 21311-ek driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 21311-ek and 21311?", "a": "They share the ISO 15 envelope and the same 159/166 kN ratings, but 21311-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 21311 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "21311-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "21311", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 21311; identical ISO 15 envelope, fits H311 adapter sleeve on a 50 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "21311-EK", "SKF 21311 EK", "21311 K" ], "locale_variants": {} }, { "sku": "22311-EK", "brand": "SKF", "manufacturer_designation": "SKF 22311 EK", "series": "22300-series", "type": "spherical_roller", "d_mm": 55, "D_mm": 120, "B_mm": 43, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 280, "static_load_kN": 280, "fatigue_load_limit_kN": 30, "max_rpm": 5600, "reference_speed_rpm": 4300, "limiting_speed_rpm": 5600, "weight_g": 2850, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For sleeve mounting on a 55 mm shaft, SKF order number SKF 22311 EK is the 1:12 tapered-bore spherical roller bearing in the 22300-series family (dimension series 23 (heavy OD, wide)); the cylindrical-bore equivalent is a separate order number, 22311. The code breaks down as type digit 2 (double-row spherical roller), dimension series 23 (dimension series 23 (heavy OD, wide)), and bore code 11 = 55 mm; dimensions 55×120×43 mm therefore match the ISO 15 envelope. Reading the suffix on 22311-ek, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 22311. Selection arithmetic: the C0/C ratio is about 1.00 (static 280 kN against dynamic 280 kN), typical of a spherical roller sized for heavy combined loads, and the 30 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Over-driving the 22311-ek up its sleeve pinches radial clearance below the residual minimum and can crack the inner ring in service; under-driving leaves the sleeve seat loose, so the ring creeps and frets the sleeve — measure, do not estimate.", "applications": [ "vibrating screen and scalper main shafts", "conveyor drive and bend pulleys", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder", "fan and pulley shafts that need periodic bearing removal in the field" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "smearing on the roller-raceway contact during skid starts below the minimum load" ], "pitfalls": [ "On this 55 mm bore, an interference inner-ring fit consumes a large share of the CN clearance; specify C3 when the inner ring rotates hot, and verify residual clearance after mounting rather than trusting the catalogue clearance class.", "The 22300-series series at 55 mm bore (120×43 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 5,600 r/min ceiling.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 43 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 43 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "The 22311-ek shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 280/280 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The 280/280 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22311 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22311-ek?", "a": "The SKF 22311 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 55 mm nominal bore, 120 mm outer diameter and 43 mm width (2.165 × 4.724 × 1.693 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 280 kN, C0 280 kN, Pu 30 kN, reference speed 4,300 r/min, limiting speed 5,600 r/min, mass about 2850 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 22311-ek?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 22311-ek?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 55 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 22311-ek driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 22311-ek and 22311?", "a": "They share the ISO 15 envelope and the same 280/280 kN ratings, but 22311-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22311 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "22311", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 22311; identical ISO 15 envelope, fits H2311 adapter sleeve on a 50 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22311-EK", "SKF 22311 EK", "22311 K" ], "locale_variants": {} }, { "sku": "22212-EK", "brand": "SKF", "manufacturer_designation": "SKF 22212 EK", "series": "22200-series", "type": "spherical_roller", "d_mm": 60, "D_mm": 110, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 159, "static_load_kN": 166, "fatigue_load_limit_kN": 18.6, "max_rpm": 7500, "reference_speed_rpm": 5600, "limiting_speed_rpm": 7500, "weight_g": 1450, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For sleeve mounting on a 60 mm shaft, SKF order number SKF 22212 EK is the 1:12 tapered-bore spherical roller bearing in the 22200-series family (dimension series 22 (medium OD, wide)); the cylindrical-bore equivalent is a separate order number, 22212. On the SKF nameplate, 22212-ek follows the ISO 15 convention: 2 for the spherical roller type, 22 for the dimension series 22 (medium OD, wide), final digits 12 for the 60 mm bore. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. Catalogue mass 1450 g for the 60×110×28 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. After drive-up, re-check radial clearance and then swing the outer ring through its self-aligning range: the sphered raceway of the 22212-ek must still tilt ≈ 0.5–2.5° freely — a joint that binds after sleeve mounting signals excessive drive-up or a cocked sleeve.", "applications": [ "marine propulsion and thruster shafts", "cement-mill trunnion and drive shafts", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Mount the 60 mm bore 22212-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 22200-series series at 60 mm bore (110×28 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.", "The 22212-ek and its cylindrical-bore counterpart 22212 share envelope and load ratings (159/166 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 22212-ek to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "The 22212-ek shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 159/166 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The 159/166 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22212 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22212-ek?", "a": "The SKF 22212 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 60 mm nominal bore, 110 mm outer diameter and 28 mm width (2.362 × 4.331 × 1.102 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 159 kN, C0 166 kN, Pu 18.6 kN, reference speed 5,600 r/min, limiting speed 7,500 r/min, mass about 1450 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 22212-ek?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 22212-ek?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 60 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 22212-ek driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 22212-ek and 22212?", "a": "They share the ISO 15 envelope and the same 159/166 kN ratings, but 22212-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22212 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "22212", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 22212; identical ISO 15 envelope, fits H312 adapter sleeve on a 55 mm shaft." }, { "equiv_sku": "C2212-TN9", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2212 TN9 shares the 60×110×28 mm envelope but catalogue C/C0 differ (143/156 kN vs 159/166 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C2212-KTN9", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2212 KTN9 shares the 60×110×28 mm envelope but catalogue C/C0 differ (143/156 kN vs 159/166 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C2212-V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2212 V shares the 60×110×28 mm envelope but catalogue C/C0 differ (166/190 kN vs 159/166 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C2212-KV", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2212 KV shares the 60×110×28 mm envelope but catalogue C/C0 differ (166/190 kN vs 159/166 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22212-EK", "SKF 22212 EK", "22212 K" ], "locale_variants": {} }, { "sku": "21312-EK", "brand": "SKF", "manufacturer_designation": "SKF 21312 EK", "series": "21300-series", "type": "spherical_roller", "d_mm": 60, "D_mm": 130, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 217, "static_load_kN": 240, "fatigue_load_limit_kN": 26.5, "max_rpm": 6300, "reference_speed_rpm": 4800, "limiting_speed_rpm": 6300, "weight_g": 2350, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "21312-ek is the 1:12 tapered-bore execution of the 21300-series spherical roller bearing: the same two barrel-roller rows on a sphered outer raceway as 21312, but the inner-ring bore tapers 1 mm per 12 mm for adapter- or withdrawal-sleeve mounting, as listed by SKF in SKF catalogue PUB BU/P1 17000. On the SKF nameplate, 21312-ek follows the ISO 15 convention: 2 for the spherical roller type, 13 for the dimension series 13 (heavy OD, normal width), final digits 12 for the 60 mm bore. Reading the suffix on 21312-ek, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 21312. At 4,800 r/min reference speed the 35.0 mm-section 21312-ek is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 6,300 r/min as the mechanical ceiling. On an H adapter sleeve the 60 mm shaft seat only needs an h9 plain journal; slide the sleeve into the 21312-ek inner ring, tighten the KM nut against the MB washer until the catalogue clearance-reduction value is reached, then lock the washer tab.", "applications": [ "heavy conveyor head shafts in mining", "jaw and cone crusher main shafts", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat", "split-housing plummer block arrangements with bearings swapped in situ" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Mount the 60 mm bore 21312-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 21300-series series at 60 mm bore (130×31 mm) pairs a heavy OD with a narrow section — a compact way to add capacity, but the shoulder and abutment diameters differ from the 222 series; it is not a drop-in swap.", "The adapter sleeve is selected by actual shaft diameter, not by the 60 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 21312-ek with different sleeves.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 21312-ek to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 217/240 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 21312 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 21312-ek?", "a": "The SKF 21312 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 60 mm nominal bore, 130 mm outer diameter and 31 mm width (2.362 × 5.118 × 1.22 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 217 kN, C0 240 kN, Pu 26.5 kN, reference speed 4,800 r/min, limiting speed 6,300 r/min, mass about 2350 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 21312-ek?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 21312-ek?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 60 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 21312-ek driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 21312-ek and 21312?", "a": "They share the ISO 15 envelope and the same 217/240 kN ratings, but 21312-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 21312 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "21312-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "21312", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 21312; identical ISO 15 envelope, fits H312 adapter sleeve on a 55 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "21312-EK", "SKF 21312 EK", "21312 K" ], "locale_variants": {} }, { "sku": "22312-EK", "brand": "SKF", "manufacturer_designation": "SKF 22312 EK", "series": "22300-series", "type": "spherical_roller", "d_mm": 60, "D_mm": 130, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 325, "static_load_kN": 335, "fatigue_load_limit_kN": 36, "max_rpm": 5300, "reference_speed_rpm": 4000, "limiting_speed_rpm": 5300, "weight_g": 3500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 22312-ek denotes the tapered-bore version (K suffix, taper 1:12) of the 22300-series spherical roller bearing: dimensioned 60×130×46 mm, it seats on an adapter or withdrawal sleeve rather than directly on a machined journal. Numbering ties the bearing to its envelope: 22312-ek means spherical-roller type, dimension series 23, 60 mm bore — which is why the 130×46 mm outline swaps dimensionally with other ISO 15 bearings of the same code. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. At 4,000 r/min reference speed the 35.0 mm-section 22312-ek is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 5,300 r/min as the mechanical ceiling. On an H adapter sleeve the 60 mm shaft seat only needs an h9 plain journal; slide the sleeve into the 22312-ek inner ring, tighten the KM nut against the MB washer until the catalogue clearance-reduction value is reached, then lock the washer tab.", "applications": [ "heavy conveyor head shafts in mining", "jaw and cone crusher main shafts", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder", "fan and pulley shafts that need periodic bearing removal in the field" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Mount the 60 mm bore 22312-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 22300-series series at 60 mm bore (130×46 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 5,300 r/min ceiling.", "The adapter sleeve is selected by actual shaft diameter, not by the 60 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 22312-ek with different sleeves.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 22312-ek to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "Shaft and housing fillets must clear the bearing chamfer so the 46 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 325/335 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22312 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22312-ek?", "a": "The SKF 22312 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 60 mm nominal bore, 130 mm outer diameter and 46 mm width (2.362 × 5.118 × 1.811 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 325 kN, C0 335 kN, Pu 36 kN, reference speed 4,000 r/min, limiting speed 5,300 r/min, mass about 3500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 22312-ek?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 22312-ek?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 60 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 22312-ek driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 22312-ek and 22312?", "a": "They share the ISO 15 envelope and the same 325/335 kN ratings, but 22312-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22312 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "22312", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 22312; identical ISO 15 envelope, fits H2312 adapter sleeve on a 55 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22312-EK", "SKF 22312 EK", "22312 K" ], "locale_variants": {} }, { "sku": "22213-EK", "brand": "SKF", "manufacturer_designation": "SKF 22213 EK", "series": "22200-series", "type": "spherical_roller", "d_mm": 65, "D_mm": 120, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 198, "static_load_kN": 216, "fatigue_load_limit_kN": 24, "max_rpm": 7000, "reference_speed_rpm": 5000, "limiting_speed_rpm": 7000, "weight_g": 1950, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 22213-ek denotes the tapered-bore version (K suffix, taper 1:12) of the 22200-series spherical roller bearing: dimensioned 65×120×31 mm, it seats on an adapter or withdrawal sleeve rather than directly on a machined journal. Digit by digit, 22213-ek reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 22, and bore reference 13 resolving to 65 mm; 120 mm OD and 31 mm width are the matching ISO 15 boundary values. Reading the suffix on 22213-ek, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 22213. With C 198 kN and C0 216 kN, the 22213-ek load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. At 65 mm bore, dismount after service is by KM locknut reversal or a hydraulic nut on larger sizes; oil-injection grooves on the bigger sleeves let pressurised oil float the 22213-ek off the taper without scoring either surface.", "applications": [ "large vibrating screens and feeders", "marine propulsion and thruster shafts", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Mount the 65 mm bore 22213-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 22200-series series at 65 mm bore (120×31 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 31 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 31 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "Shaft and housing fillets must clear the bearing chamfer so the 31 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 198/216 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22213 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22213-ek?", "a": "The SKF 22213 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 65 mm nominal bore, 120 mm outer diameter and 31 mm width (2.559 × 4.724 × 1.22 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 198 kN, C0 216 kN, Pu 24 kN, reference speed 5,000 r/min, limiting speed 7,000 r/min, mass about 1950 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 22213-ek?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 22213-ek?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 65 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 22213-ek driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 22213-ek and 22213?", "a": "They share the ISO 15 envelope and the same 198/216 kN ratings, but 22213-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22213 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "22213", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 22213; identical ISO 15 envelope, fits H313 adapter sleeve on a 60 mm shaft." }, { "equiv_sku": "C2213-TN9", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2213 TN9 shares the 65×120×31 mm envelope but catalogue C/C0 differ (180/180 kN vs 198/216 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C2213-KTN9", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2213 KTN9 shares the 65×120×31 mm envelope but catalogue C/C0 differ (180/180 kN vs 198/216 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C2213-V", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2213 V shares the 65×120×31 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C2213-KV", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2213 KV shares the 65×120×31 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22213-EK", "SKF 22213 EK", "22213 K" ], "locale_variants": {} }, { "sku": "22214-EK", "brand": "SKF", "manufacturer_designation": "SKF 22214 EK", "series": "22200-series", "type": "spherical_roller", "d_mm": 70, "D_mm": 125, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 213, "static_load_kN": 228, "fatigue_load_limit_kN": 25.5, "max_rpm": 6700, "reference_speed_rpm": 5000, "limiting_speed_rpm": 6700, "weight_g": 2150, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "22214-ek is the 1:12 tapered-bore execution of the 22200-series spherical roller bearing: the same two barrel-roller rows on a sphered outer raceway as 22214, but the inner-ring bore tapers 1 mm per 12 mm for adapter- or withdrawal-sleeve mounting, as listed by SKF in SKF catalogue PUB BU/P1 17000. The code breaks down as type digit 2 (double-row spherical roller), dimension series 22 (dimension series 22 (medium OD, wide)), and bore code 14 = 70 mm; dimensions 70×125×31 mm therefore match the ISO 15 envelope. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. The 27.5 mm radial section height ((125−70)/2) and 2150 g catalogue mass frame a 70 mm bore bearing rated at 213 kN C — roughly 3.04 kN of dynamic capacity per millimetre of bore before application factors. For shafts with a locating shoulder, use an AH withdrawal sleeve instead of an adapter sleeve: the bearing presses against the shoulder and the sleeve is drawn out for dismounting, making the 22214-ek removable without an induction heater.", "applications": [ "rolling-mill pinion and back-up shafts", "large vibrating screens and feeders", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals" ], "pitfalls": [ "Mount the 70 mm bore 22214-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 22200-series series at 70 mm bore (125×31 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.", "The adapter sleeve is selected by actual shaft diameter, not by the 70 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 22214-ek with different sleeves.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 22214-ek to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "The 2150 g mass and 31 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 22214-ek.", "The 213/228 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22214 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22214-ek?", "a": "The SKF 22214 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 70 mm nominal bore, 125 mm outer diameter and 31 mm width (2.756 × 4.921 × 1.22 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 213 kN, C0 228 kN, Pu 25.5 kN, reference speed 5,000 r/min, limiting speed 6,700 r/min, mass about 2150 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 22214-ek?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 22214-ek?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 70 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 22214-ek driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 22214-ek and 22214?", "a": "They share the ISO 15 envelope and the same 213/228 kN ratings, but 22214-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22214 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "22214", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 22214; identical ISO 15 envelope, fits H314 adapter sleeve on a 60 mm shaft." }, { "equiv_sku": "C2214-TN9", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2214 TN9 shares the 70×125×31 mm envelope but catalogue C/C0 differ (186/196 kN vs 213/228 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C2214-KTN9", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2214 KTN9 shares the 70×125×31 mm envelope but catalogue C/C0 differ (186/196 kN vs 213/228 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C2214-V", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2214 V shares the 70×125×31 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22214-EK", "SKF 22214 EK", "22214 K" ], "locale_variants": {} }, { "sku": "21313-EK", "brand": "SKF", "manufacturer_designation": "SKF 21313 EK", "series": "21300-series", "type": "spherical_roller", "d_mm": 65, "D_mm": 140, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 243, "static_load_kN": 270, "fatigue_load_limit_kN": 29, "max_rpm": 6000, "reference_speed_rpm": 4300, "limiting_speed_rpm": 6000, "weight_g": 2900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For sleeve mounting on a 65 mm shaft, SKF order number SKF 21313 EK is the 1:12 tapered-bore spherical roller bearing in the 21300-series family (dimension series 13 (heavy OD, normal width)); the cylindrical-bore equivalent is a separate order number, 21313. Digit by digit, 21313-ek reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 13, and bore reference 13 resolving to 65 mm; 140 mm OD and 33 mm width are the matching ISO 15 boundary values. The K in the designation marks the 1:12 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. At 4,300 r/min reference speed the 37.5 mm-section 21313-ek is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 6,000 r/min as the mechanical ceiling. On an H adapter sleeve the 65 mm shaft seat only needs an h9 plain journal; slide the sleeve into the 21313-ek inner ring, tighten the KM nut against the MB washer until the catalogue clearance-reduction value is reached, then lock the washer tab.", "applications": [ "heavy conveyor head shafts in mining", "jaw and cone crusher main shafts", "split-housing plummer block arrangements with bearings swapped in situ", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount the 65 mm bore 21313-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 21300-series series at 65 mm bore (140×33 mm) pairs a heavy OD with a narrow section — a compact way to add capacity, but the shoulder and abutment diameters differ from the 222 series; it is not a drop-in swap.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 21313-ek to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "The 21313-ek and its cylindrical-bore counterpart 21313 share envelope and load ratings (243/270 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 21313-ek; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 243/270 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 21313 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 21313-ek?", "a": "The SKF 21313 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 65 mm nominal bore, 140 mm outer diameter and 33 mm width (2.559 × 5.512 × 1.299 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 243 kN, C0 270 kN, Pu 29 kN, reference speed 4,300 r/min, limiting speed 6,000 r/min, mass about 2900 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 21313-ek?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 21313-ek?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 65 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 21313-ek driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 21313-ek and 21313?", "a": "They share the ISO 15 envelope and the same 243/270 kN ratings, but 21313-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 21313 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "21313-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "21313", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 21313; identical ISO 15 envelope, fits H313 adapter sleeve on a 60 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "21313-EK", "SKF 21313 EK", "21313 K" ], "locale_variants": {} }, { "sku": "22313-EK", "brand": "SKF", "manufacturer_designation": "SKF 22313 EK", "series": "22300-series", "type": "spherical_roller", "d_mm": 65, "D_mm": 140, "B_mm": 48, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 357, "static_load_kN": 360, "fatigue_load_limit_kN": 38, "max_rpm": 5000, "reference_speed_rpm": 3800, "limiting_speed_rpm": 5000, "weight_g": 4200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "22313-ek is the 1:12 tapered-bore execution of the 22300-series spherical roller bearing: the same two barrel-roller rows on a sphered outer raceway as 22313, but the inner-ring bore tapers 1 mm per 12 mm for adapter- or withdrawal-sleeve mounting, as listed by SKF in SKF catalogue PUB BU/P1 17000. Reading the designation: the leading 2 marks a spherical roller bearing, the 23 is the ISO 15 dimension series (dimension series 23 (heavy OD, wide)), and the last two digits encode the 65 mm bore; the 140 mm OD and 48 mm width follow the ISO 15 general plan. Reading the suffix on 22313-ek, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 22313. The 38 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.01 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. Mounting on the 1:12 taper is controlled by clearance reduction or measured axial drive-up, never by locknut torque: SKF tables give the target radial-clearance decrease for the 65 mm 22313-ek, checked with feeler gauges before and after drive-up.", "applications": [ "cement-mill trunnion and drive shafts", "heavy conveyor head shafts in mining", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder", "fan and pulley shafts that need periodic bearing removal in the field" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Mount the 65 mm bore 22313-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 22300-series series at 65 mm bore (140×48 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 5,000 r/min ceiling.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 22313-ek to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 48 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "The 4200 g mass and 48 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 22313-ek.", "The 357/360 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22313 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22313-ek?", "a": "The SKF 22313 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 65 mm nominal bore, 140 mm outer diameter and 48 mm width (2.559 × 5.512 × 1.89 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 357 kN, C0 360 kN, Pu 38 kN, reference speed 3,800 r/min, limiting speed 5,000 r/min, mass about 4200 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 22313-ek?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 22313-ek?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 65 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 22313-ek driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 22313-ek and 22313?", "a": "They share the ISO 15 envelope and the same 357/360 kN ratings, but 22313-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22313 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "22313", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 22313; identical ISO 15 envelope, fits H2313 adapter sleeve on a 60 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22313-EK", "SKF 22313 EK", "22313 K" ], "locale_variants": {} }, { "sku": "21314-EK", "brand": "SKF", "manufacturer_designation": "SKF 21314 EK", "series": "21300-series", "type": "spherical_roller", "d_mm": 70, "D_mm": 150, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 291, "static_load_kN": 325, "fatigue_load_limit_kN": 34.5, "max_rpm": 5600, "reference_speed_rpm": 4000, "limiting_speed_rpm": 5600, "weight_g": 3700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 21314-ek denotes the tapered-bore version (K suffix, taper 1:12) of the 21300-series spherical roller bearing: dimensioned 70×150×35 mm, it seats on an adapter or withdrawal sleeve rather than directly on a machined journal. The code breaks down as type digit 2 (double-row spherical roller), dimension series 13 (dimension series 13 (heavy OD, normal width)), and bore code 14 = 70 mm; dimensions 70×150×35 mm therefore match the ISO 15 envelope. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. The 34.5 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.12 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. Mounting on the 1:12 taper is controlled by clearance reduction or measured axial drive-up, never by locknut torque: SKF tables give the target radial-clearance decrease for the 70 mm 21314-ek, checked with feeler gauges before and after drive-up.", "applications": [ "cement-mill trunnion and drive shafts", "heavy conveyor head shafts in mining", "split-housing plummer block arrangements with bearings swapped in situ", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Mount the 70 mm bore 21314-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 21300-series series at 70 mm bore (150×35 mm) pairs a heavy OD with a narrow section — a compact way to add capacity, but the shoulder and abutment diameters differ from the 222 series; it is not a drop-in swap.", "The 21314-ek and its cylindrical-bore counterpart 21314 share envelope and load ratings (291/325 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "The adapter sleeve is selected by actual shaft diameter, not by the 70 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 21314-ek with different sleeves.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 291/325 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 21314 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 21314-ek?", "a": "The SKF 21314 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 70 mm nominal bore, 150 mm outer diameter and 35 mm width (2.756 × 5.906 × 1.378 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 291 kN, C0 325 kN, Pu 34.5 kN, reference speed 4,000 r/min, limiting speed 5,600 r/min, mass about 3700 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 21314-ek?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 21314-ek?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 70 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 21314-ek driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 21314-ek and 21314?", "a": "They share the ISO 15 envelope and the same 291/325 kN ratings, but 21314-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 21314 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "21314-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "21314", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 21314; identical ISO 15 envelope, fits H314 adapter sleeve on a 60 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "21314-EK", "SKF 21314 EK", "21314 K" ], "locale_variants": {} }, { "sku": "22314-EK", "brand": "SKF", "manufacturer_designation": "SKF 22314 EK", "series": "22300-series", "type": "spherical_roller", "d_mm": 70, "D_mm": 150, "B_mm": 51, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 413, "static_load_kN": 430, "fatigue_load_limit_kN": 45, "max_rpm": 4500, "reference_speed_rpm": 3400, "limiting_speed_rpm": 4500, "weight_g": 5350, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For sleeve mounting on a 70 mm shaft, SKF order number SKF 22314 EK is the 1:12 tapered-bore spherical roller bearing in the 22300-series family (dimension series 23 (heavy OD, wide)); the cylindrical-bore equivalent is a separate order number, 22314. On the SKF nameplate, 22314-ek follows the ISO 15 convention: 2 for the spherical roller type, 23 for the dimension series 23 (heavy OD, wide), final digits 14 for the 70 mm bore. The K in the designation marks the 1:12 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. The 45 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.04 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. Mounting on the 1:12 taper is controlled by clearance reduction or measured axial drive-up, never by locknut torque: SKF tables give the target radial-clearance decrease for the 70 mm 22314-ek, checked with feeler gauges before and after drive-up.", "applications": [ "cement-mill trunnion and drive shafts", "heavy conveyor head shafts in mining", "fan and pulley shafts that need periodic bearing removal in the field", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount the 70 mm bore 22314-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 22300-series series at 70 mm bore (150×51 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 4,500 r/min ceiling.", "The 22314-ek and its cylindrical-bore counterpart 22314 share envelope and load ratings (413/430 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "The adapter sleeve is selected by actual shaft diameter, not by the 70 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 22314-ek with different sleeves.", "Shaft and housing fillets must clear the bearing chamfer so the 51 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 413/430 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22314 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22314-ek?", "a": "The SKF 22314 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 70 mm nominal bore, 150 mm outer diameter and 51 mm width (2.756 × 5.906 × 2.008 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 413 kN, C0 430 kN, Pu 45 kN, reference speed 3,400 r/min, limiting speed 4,500 r/min, mass about 5350 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 22314-ek?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 22314-ek?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 70 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 22314-ek driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 22314-ek and 22314?", "a": "They share the ISO 15 envelope and the same 413/430 kN ratings, but 22314-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22314 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "22314", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 22314; identical ISO 15 envelope, fits H2314 adapter sleeve on a 60 mm shaft." }, { "equiv_sku": "C2314", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2314 shares the 70×150×51 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C2314-K", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2314 K shares the 70×150×51 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22314-EK", "SKF 22314 EK", "22314 K" ], "locale_variants": {} }, { "sku": "22215-EK", "brand": "SKF", "manufacturer_designation": "SKF 22215 EK", "series": "22200-series", "type": "spherical_roller", "d_mm": 75, "D_mm": 130, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 217, "static_load_kN": 240, "fatigue_load_limit_kN": 26.5, "max_rpm": 6300, "reference_speed_rpm": 4800, "limiting_speed_rpm": 6300, "weight_g": 2450, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For sleeve mounting on a 75 mm shaft, SKF order number SKF 22215 EK is the 1:12 tapered-bore spherical roller bearing in the 22200-series family (dimension series 22 (medium OD, wide)); the cylindrical-bore equivalent is a separate order number, 22215. Numbering ties the bearing to its envelope: 22215-ek means spherical-roller type, dimension series 22, 75 mm bore — which is why the 130×31 mm outline swaps dimensionally with other ISO 15 bearings of the same code. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. The 27.5 mm radial section height ((130−75)/2) and 2450 g catalogue mass frame a 75 mm bore bearing rated at 217 kN C — roughly 2.89 kN of dynamic capacity per millimetre of bore before application factors. For shafts with a locating shoulder, use an AH withdrawal sleeve instead of an adapter sleeve: the bearing presses against the shoulder and the sleeve is drawn out for dismounting, making the 22215-ek removable without an induction heater.", "applications": [ "rolling-mill pinion and back-up shafts", "large vibrating screens and feeders", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Mount the 75 mm bore 22215-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 22200-series series at 75 mm bore (130×31 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 22215-ek to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "The 22215-ek and its cylindrical-bore counterpart 22215 share envelope and load ratings (217/240 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "Shaft and housing fillets must clear the bearing chamfer so the 31 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 217/240 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22215 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22215-ek?", "a": "The SKF 22215 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 75 mm nominal bore, 130 mm outer diameter and 31 mm width (2.953 × 5.118 × 1.22 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 217 kN, C0 240 kN, Pu 26.5 kN, reference speed 4,800 r/min, limiting speed 6,300 r/min, mass about 2450 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 22215-ek?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 22215-ek?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 75 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 22215-ek driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 22215-ek and 22215?", "a": "They share the ISO 15 envelope and the same 217/240 kN ratings, but 22215-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22215 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "22215", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 22215; identical ISO 15 envelope, fits H315 adapter sleeve on a 65 mm shaft." }, { "equiv_sku": "C2215", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2215 shares the 75×130×31 mm envelope but catalogue C/C0 differ (196/208 kN vs 217/240 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C2215-K", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2215 K shares the 75×130×31 mm envelope but catalogue C/C0 differ (196/208 kN vs 217/240 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C2215-V", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2215 V shares the 75×130×31 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C2215-KV", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2215 KV shares the 75×130×31 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22215-EK", "SKF 22215 EK", "22215 K" ], "locale_variants": {} }, { "sku": "21315-EK", "brand": "SKF", "manufacturer_designation": "SKF 21315 EK", "series": "21300-series", "type": "spherical_roller", "d_mm": 75, "D_mm": 160, "B_mm": 37, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 291, "static_load_kN": 325, "fatigue_load_limit_kN": 34.5, "max_rpm": 5600, "reference_speed_rpm": 4000, "limiting_speed_rpm": 5600, "weight_g": 4500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "21315-ek is the 1:12 tapered-bore execution of the 21300-series spherical roller bearing: the same two barrel-roller rows on a sphered outer raceway as 21315, but the inner-ring bore tapers 1 mm per 12 mm for adapter- or withdrawal-sleeve mounting, as listed by SKF in SKF catalogue PUB BU/P1 17000. Numbering ties the bearing to its envelope: 21315-ek means spherical-roller type, dimension series 13, 75 mm bore — which is why the 160×37 mm outline swaps dimensionally with other ISO 15 bearings of the same code. The K in the designation marks the 1:12 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. Catalogue mass 4500 g for the 75×160×37 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. Because driving up the 1:12 taper consumes radial clearance, K executions are commonly ordered with C3 initial clearance so the residual running clearance after mounting matches the cylindrical-bore 21315 on an interference seat.", "applications": [ "marine propulsion and thruster shafts", "cement-mill trunnion and drive shafts", "split-housing plummer block arrangements with bearings swapped in situ", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems" ], "pitfalls": [ "Mount the 75 mm bore 21315-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 21300-series series at 75 mm bore (160×37 mm) pairs a heavy OD with a narrow section — a compact way to add capacity, but the shoulder and abutment diameters differ from the 222 series; it is not a drop-in swap.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 37 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "The 21315-ek and its cylindrical-bore counterpart 21315 share envelope and load ratings (291/325 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "Catalogue reference speed and limiting speed are different limits: the 4,000 r/min reference is a thermal criterion under load, while the 5,600 r/min limiting value is the mechanical ceiling — observe both.", "The 291/325 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 21315 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 21315-ek?", "a": "The SKF 21315 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 75 mm nominal bore, 160 mm outer diameter and 37 mm width (2.953 × 6.299 × 1.457 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 291 kN, C0 325 kN, Pu 34.5 kN, reference speed 4,000 r/min, limiting speed 5,600 r/min, mass about 4500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 21315-ek?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 21315-ek?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 75 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 21315-ek driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 21315-ek and 21315?", "a": "They share the ISO 15 envelope and the same 291/325 kN ratings, but 21315-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 21315 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "21315-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "21315", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 21315; identical ISO 15 envelope, fits H315 adapter sleeve on a 65 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "21315-EK", "SKF 21315 EK", "21315 K" ], "locale_variants": {} }, { "sku": "22315-EK", "brand": "SKF", "manufacturer_designation": "SKF 22315 EK", "series": "22300-series", "type": "spherical_roller", "d_mm": 75, "D_mm": 160, "B_mm": 55, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 462, "static_load_kN": 475, "fatigue_load_limit_kN": 48, "max_rpm": 4300, "reference_speed_rpm": 3200, "limiting_speed_rpm": 4300, "weight_g": 6500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF lists SKF 22315 EK as the adapter-sleeve execution in the 22300-series range: a 75 mm nominal-bore spherical roller bearing whose 1:12 tapered inner ring is driven up a sleeve, with 160 mm OD and 55 mm width to the ISO 15 envelope. Digit by digit, 22315-ek reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 23, and bore reference 15 resolving to 75 mm; 160 mm OD and 55 mm width are the matching ISO 15 boundary values. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. Catalogue mass 6500 g for the 75×160×55 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. Over-driving the 22315-ek up its sleeve pinches radial clearance below the residual minimum and can crack the inner ring in service; under-driving leaves the sleeve seat loose, so the ring creeps and frets the sleeve — measure, do not estimate.", "applications": [ "marine propulsion and thruster shafts", "cement-mill trunnion and drive shafts", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat", "split-housing plummer block arrangements with bearings swapped in situ" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Mount the 75 mm bore 22315-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 22300-series series at 75 mm bore (160×55 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 4,300 r/min ceiling.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 55 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "The 22315-ek and its cylindrical-bore counterpart 22315 share envelope and load ratings (462/475 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "The 6500 g mass and 55 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 22315-ek.", "The 462/475 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22315 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22315-ek?", "a": "The SKF 22315 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 75 mm nominal bore, 160 mm outer diameter and 55 mm width (2.953 × 6.299 × 2.165 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 462 kN, C0 475 kN, Pu 48 kN, reference speed 3,200 r/min, limiting speed 4,300 r/min, mass about 6500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 22315-ek?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 22315-ek?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 75 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 22315-ek driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 22315-ek and 22315?", "a": "They share the ISO 15 envelope and the same 462/475 kN ratings, but 22315-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22315 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "22315", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 22315; identical ISO 15 envelope, fits H2315 adapter sleeve on a 65 mm shaft." }, { "equiv_sku": "C2315", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2315 shares the 75×160×55 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C2315-K", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2315 K shares the 75×160×55 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22315-EK", "SKF 22315 EK", "22315 K" ], "locale_variants": {} }, { "sku": "22216-EK", "brand": "SKF", "manufacturer_designation": "SKF 22216 EK", "series": "22200-series", "type": "spherical_roller", "d_mm": 80, "D_mm": 140, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 243, "static_load_kN": 270, "fatigue_load_limit_kN": 29, "max_rpm": 6000, "reference_speed_rpm": 4300, "limiting_speed_rpm": 6000, "weight_g": 3000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 22216-ek denotes the tapered-bore version (K suffix, taper 1:12) of the 22200-series spherical roller bearing: dimensioned 80×140×33 mm, it seats on an adapter or withdrawal sleeve rather than directly on a machined journal. Reading the designation: the leading 2 marks a spherical roller bearing, the 22 is the ISO 15 dimension series (dimension series 22 (medium OD, wide)), and the last two digits encode the 80 mm bore; the 140 mm OD and 33 mm width follow the ISO 15 general plan. The K in the designation marks the 1:12 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. Speed planning uses two different ceilings: 4,300 r/min thermal reference and 6,000 r/min mechanical limiting speed. Over-driving the 22216-ek up its sleeve pinches radial clearance below the residual minimum and can crack the inner ring in service; under-driving leaves the sleeve seat loose, so the ring creeps and frets the sleeve — measure, do not estimate.", "applications": [ "paper-machine press and dryer rolls", "rolling-mill pinion and back-up shafts", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems" ], "pitfalls": [ "Mount the 80 mm bore 22216-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 22200-series series at 80 mm bore (140×33 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.", "The 22216-ek and its cylindrical-bore counterpart 22216 share envelope and load ratings (243/270 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "The adapter sleeve is selected by actual shaft diameter, not by the 80 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 22216-ek with different sleeves.", "The 3000 g mass and 33 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 22216-ek.", "The 243/270 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22216 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22216-ek?", "a": "The SKF 22216 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 80 mm nominal bore, 140 mm outer diameter and 33 mm width (3.15 × 5.512 × 1.299 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 243 kN, C0 270 kN, Pu 29 kN, reference speed 4,300 r/min, limiting speed 6,000 r/min, mass about 3000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 22216-ek?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 22216-ek?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 80 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 22216-ek driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 22216-ek and 22216?", "a": "They share the ISO 15 envelope and the same 243/270 kN ratings, but 22216-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22216 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "22216", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 22216; identical ISO 15 envelope, fits H316 adapter sleeve on a 70 mm shaft." }, { "equiv_sku": "C2216", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2216 shares the 80×140×33 mm envelope but catalogue C/C0 differ (220/250 kN vs 243/270 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C2216-K", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2216 K shares the 80×140×33 mm envelope but catalogue C/C0 differ (220/250 kN vs 243/270 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C2216-V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2216 V shares the 80×140×33 mm envelope but catalogue C/C0 differ (255/305 kN vs 243/270 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C2216-KV", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2216 KV shares the 80×140×33 mm envelope but catalogue C/C0 differ (255/305 kN vs 243/270 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22216-EK", "SKF 22216 EK", "22216 K" ], "locale_variants": {} }, { "sku": "21316-EK", "brand": "SKF", "manufacturer_designation": "SKF 21316 EK", "series": "21300-series", "type": "spherical_roller", "d_mm": 80, "D_mm": 170, "B_mm": 39, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 331, "static_load_kN": 375, "fatigue_load_limit_kN": 39, "max_rpm": 5300, "reference_speed_rpm": 3800, "limiting_speed_rpm": 5300, "weight_g": 5300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For sleeve mounting on a 80 mm shaft, SKF order number SKF 21316 EK is the 1:12 tapered-bore spherical roller bearing in the 21300-series family (dimension series 13 (heavy OD, normal width)); the cylindrical-bore equivalent is a separate order number, 21316. Reading the designation: the leading 2 marks a spherical roller bearing, the 13 is the ISO 15 dimension series (dimension series 13 (heavy OD, normal width)), and the last two digits encode the 80 mm bore; the 170 mm OD and 39 mm width follow the ISO 15 general plan. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. Catalogue mass 5300 g for the 80×170×39 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. Because driving up the 1:12 taper consumes radial clearance, K executions are commonly ordered with C3 initial clearance so the residual running clearance after mounting matches the cylindrical-bore 21316 on an interference seat.", "applications": [ "marine propulsion and thruster shafts", "cement-mill trunnion and drive shafts", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Mount the 80 mm bore 21316-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 21300-series series at 80 mm bore (170×39 mm) pairs a heavy OD with a narrow section — a compact way to add capacity, but the shoulder and abutment diameters differ from the 222 series; it is not a drop-in swap.", "The adapter sleeve is selected by actual shaft diameter, not by the 80 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 21316-ek with different sleeves.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 39 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 331/375 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 21316 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 21316-ek?", "a": "The SKF 21316 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 80 mm nominal bore, 170 mm outer diameter and 39 mm width (3.15 × 6.693 × 1.535 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 331 kN, C0 375 kN, Pu 39 kN, reference speed 3,800 r/min, limiting speed 5,300 r/min, mass about 5300 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 21316-ek?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 21316-ek?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 80 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 21316-ek driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 21316-ek and 21316?", "a": "They share the ISO 15 envelope and the same 331/375 kN ratings, but 21316-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 21316 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "21316-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "21316", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 21316; identical ISO 15 envelope, fits H316 adapter sleeve on a 70 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "21316-EK", "SKF 21316 EK", "21316 K" ], "locale_variants": {} }, { "sku": "22316-EK", "brand": "SKF", "manufacturer_designation": "SKF 22316 EK", "series": "22300-series", "type": "spherical_roller", "d_mm": 80, "D_mm": 170, "B_mm": 58, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 516, "static_load_kN": 530, "fatigue_load_limit_kN": 54, "max_rpm": 4000, "reference_speed_rpm": 3000, "limiting_speed_rpm": 4000, "weight_g": 7650, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The SKF 22316 EK is a 80×170×58 mm spherical roller bearing with a 1:12 tapered bore — SKF catalogue execution for sleeve mounting on a 80 mm plain shaft, retaining the double-row self-aligning barrel-roller design. The code breaks down as type digit 2 (double-row spherical roller), dimension series 23 (dimension series 23 (heavy OD, wide)), and bore code 16 = 80 mm; dimensions 80×170×58 mm therefore match the ISO 15 envelope. Reading the suffix on 22316-ek, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 22316. With C 516 kN and C0 530 kN, the 22316-ek load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. On an H adapter sleeve the 80 mm shaft seat only needs an h9 plain journal; slide the sleeve into the 22316-ek inner ring, tighten the KM nut against the MB washer until the catalogue clearance-reduction value is reached, then lock the washer tab.", "applications": [ "large vibrating screens and feeders", "marine propulsion and thruster shafts", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat", "split-housing plummer block arrangements with bearings swapped in situ" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Mount the 80 mm bore 22316-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 22300-series series at 80 mm bore (170×58 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 4,000 r/min ceiling.", "The adapter sleeve is selected by actual shaft diameter, not by the 80 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 22316-ek with different sleeves.", "The adapter sleeve is selected by actual shaft diameter, not by the 80 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 22316-ek with different sleeves.", "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 22316-ek; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 516/530 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22316 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22316-ek?", "a": "The SKF 22316 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 80 mm nominal bore, 170 mm outer diameter and 58 mm width (3.15 × 6.693 × 2.283 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 516 kN, C0 530 kN, Pu 54 kN, reference speed 3,000 r/min, limiting speed 4,000 r/min, mass about 7650 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 22316-ek?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 22316-ek?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 80 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 22316-ek driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 22316-ek and 22316?", "a": "They share the ISO 15 envelope and the same 516/530 kN ratings, but 22316-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22316 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "22316", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 22316; identical ISO 15 envelope, fits H2316 adapter sleeve on a 70 mm shaft." }, { "equiv_sku": "C2316", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2316 shares the 80×170×58 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C2316-K", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2316 K shares the 80×170×58 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22316-EK", "SKF 22316 EK", "22316 K" ], "locale_variants": {} }, { "sku": "22217-EK", "brand": "SKF", "manufacturer_designation": "SKF 22217 EK", "series": "22200-series", "type": "spherical_roller", "d_mm": 85, "D_mm": 150, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 291, "static_load_kN": 325, "fatigue_load_limit_kN": 34.5, "max_rpm": 5600, "reference_speed_rpm": 4000, "limiting_speed_rpm": 5600, "weight_g": 3700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "22217-ek is the 1:12 tapered-bore execution of the 22200-series spherical roller bearing: the same two barrel-roller rows on a sphered outer raceway as 22217, but the inner-ring bore tapers 1 mm per 12 mm for adapter- or withdrawal-sleeve mounting, as listed by SKF in SKF catalogue PUB BU/P1 17000. On the SKF nameplate, 22217-ek follows the ISO 15 convention: 2 for the spherical roller type, 22 for the dimension series 22 (medium OD, wide), final digits 17 for the 85 mm bore. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. Selection arithmetic: the C0/C ratio is about 1.12 (static 325 kN against dynamic 291 kN), typical of a spherical roller sized for heavy combined loads, and the 34.5 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. On an H adapter sleeve the 85 mm shaft seat only needs an h9 plain journal; slide the sleeve into the 22217-ek inner ring, tighten the KM nut against the MB washer until the catalogue clearance-reduction value is reached, then lock the washer tab.", "applications": [ "jaw and cone crusher main shafts", "paper-machine press and dryer rolls", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still" ], "pitfalls": [ "Mount the 85 mm bore 22217-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 22200-series series at 85 mm bore (150×36 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 36 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "The 22217-ek and its cylindrical-bore counterpart 22217 share envelope and load ratings (291/325 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 22217-ek; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 291/325 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22217 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22217-ek?", "a": "The SKF 22217 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 85 mm nominal bore, 150 mm outer diameter and 36 mm width (3.346 × 5.906 × 1.417 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 291 kN, C0 325 kN, Pu 34.5 kN, reference speed 4,000 r/min, limiting speed 5,600 r/min, mass about 3700 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 22217-ek?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 22217-ek?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 85 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 22217-ek driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 22217-ek and 22217?", "a": "They share the ISO 15 envelope and the same 291/325 kN ratings, but 22217-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22217 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "22217", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 22217; identical ISO 15 envelope, fits H317 adapter sleeve on a 75 mm shaft." }, { "equiv_sku": "C2217", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2217 shares the 85×150×36 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C2217-K", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2217 K shares the 85×150×36 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22217-EK", "SKF 22217 EK", "22217 K" ], "locale_variants": {} }, { "sku": "21317-EK", "brand": "SKF", "manufacturer_designation": "SKF 21317 EK", "series": "21300-series", "type": "spherical_roller", "d_mm": 85, "D_mm": 180, "B_mm": 41, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 331, "static_load_kN": 375, "fatigue_load_limit_kN": 39, "max_rpm": 5300, "reference_speed_rpm": 3800, "limiting_speed_rpm": 5300, "weight_g": 6200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 21317-ek denotes the tapered-bore version (K suffix, taper 1:12) of the 21300-series spherical roller bearing: dimensioned 85×180×41 mm, it seats on an adapter or withdrawal sleeve rather than directly on a machined journal. On the SKF nameplate, 21317-ek follows the ISO 15 convention: 2 for the spherical roller type, 13 for the dimension series 13 (heavy OD, normal width), final digits 17 for the 85 mm bore. Reading the suffix on 21317-ek, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 21317. With C 331 kN and C0 375 kN, the 21317-ek load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. After drive-up, re-check radial clearance and then swing the outer ring through its self-aligning range: the sphered raceway of the 21317-ek must still tilt ≈ 0.5–2.5° freely — a joint that binds after sleeve mounting signals excessive drive-up or a cocked sleeve.", "applications": [ "large vibrating screens and feeders", "marine propulsion and thruster shafts", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Mount the 85 mm bore 21317-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 21300-series series at 85 mm bore (180×41 mm) pairs a heavy OD with a narrow section — a compact way to add capacity, but the shoulder and abutment diameters differ from the 222 series; it is not a drop-in swap.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 21317-ek to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 21317-ek to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "Catalogue reference speed and limiting speed are different limits: the 3,800 r/min reference is a thermal criterion under load, while the 5,300 r/min limiting value is the mechanical ceiling — observe both.", "The 331/375 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 21317 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 21317-ek?", "a": "The SKF 21317 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 85 mm nominal bore, 180 mm outer diameter and 41 mm width (3.346 × 7.087 × 1.614 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 331 kN, C0 375 kN, Pu 39 kN, reference speed 3,800 r/min, limiting speed 5,300 r/min, mass about 6200 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 21317-ek?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 21317-ek?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 85 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 21317-ek driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 21317-ek and 21317?", "a": "They share the ISO 15 envelope and the same 331/375 kN ratings, but 21317-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 21317 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "21317-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "21317", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 21317; identical ISO 15 envelope, fits H317 adapter sleeve on a 75 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "21317-EK", "SKF 21317 EK", "21317 K" ], "locale_variants": {} }, { "sku": "22317-EK", "brand": "SKF", "manufacturer_designation": "SKF 22317 EK", "series": "22300-series", "type": "spherical_roller", "d_mm": 85, "D_mm": 180, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 577, "static_load_kN": 620, "fatigue_load_limit_kN": 61, "max_rpm": 3800, "reference_speed_rpm": 2800, "limiting_speed_rpm": 3800, "weight_g": 8850, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF 22317 EK in SKF catalogue PUB BU/P1 17000 is a double-row spherical roller bearing with a tapered bore (1:12), intended for an H-series adapter sleeve or AH withdrawal sleeve, with two pressed-steel cages with a floating guide ring and the same 85×180×60 mm ISO 15 outline as its cylindrical-bore counterpart. Numbering ties the bearing to its envelope: 22317-ek means spherical-roller type, dimension series 23, 85 mm bore — which is why the 180×60 mm outline swaps dimensionally with other ISO 15 bearings of the same code. The K in the designation marks the 1:12 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. With C 577 kN and C0 620 kN, the 22317-ek load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. On an H adapter sleeve the 85 mm shaft seat only needs an h9 plain journal; slide the sleeve into the 22317-ek inner ring, tighten the KM nut against the MB washer until the catalogue clearance-reduction value is reached, then lock the washer tab.", "applications": [ "large vibrating screens and feeders", "marine propulsion and thruster shafts", "split-housing plummer block arrangements with bearings swapped in situ", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount the 85 mm bore 22317-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 22300-series series at 85 mm bore (180×60 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 3,800 r/min ceiling.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 22317-ek to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 22317-ek to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "The 8850 g mass and 60 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 22317-ek.", "The 577/620 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22317 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22317-ek?", "a": "The SKF 22317 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 85 mm nominal bore, 180 mm outer diameter and 60 mm width (3.346 × 7.087 × 2.362 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 577 kN, C0 620 kN, Pu 61 kN, reference speed 2,800 r/min, limiting speed 3,800 r/min, mass about 8850 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 22317-ek?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 22317-ek?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 85 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 22317-ek driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 22317-ek and 22317?", "a": "They share the ISO 15 envelope and the same 577/620 kN ratings, but 22317-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22317 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "22317", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 22317; identical ISO 15 envelope, fits H2317 adapter sleeve on a 75 mm shaft." }, { "equiv_sku": "C2317", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2317 shares the 85×180×60 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C2317-K", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2317 K shares the 85×180×60 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22317-EK", "SKF 22317 EK", "22317 K" ], "locale_variants": {} }, { "sku": "22218-EK", "brand": "SKF", "manufacturer_designation": "SKF 22218 EK", "series": "22200-series", "type": "spherical_roller", "d_mm": 90, "D_mm": 160, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 331, "static_load_kN": 375, "fatigue_load_limit_kN": 39, "max_rpm": 5300, "reference_speed_rpm": 3800, "limiting_speed_rpm": 5300, "weight_g": 4550, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For sleeve mounting on a 90 mm shaft, SKF order number SKF 22218 EK is the 1:12 tapered-bore spherical roller bearing in the 22200-series family (dimension series 22 (medium OD, wide)); the cylindrical-bore equivalent is a separate order number, 22218. Digit by digit, 22218-ek reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 22, and bore reference 18 resolving to 90 mm; 160 mm OD and 40 mm width are the matching ISO 15 boundary values. Reading the suffix on 22218-ek, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 22218. Selection arithmetic: the C0/C ratio is about 1.13 (static 375 kN against dynamic 331 kN), typical of a spherical roller sized for heavy combined loads, and the 39 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. On an H adapter sleeve the 90 mm shaft seat only needs an h9 plain journal; slide the sleeve into the 22218-ek inner ring, tighten the KM nut against the MB washer until the catalogue clearance-reduction value is reached, then lock the washer tab.", "applications": [ "jaw and cone crusher main shafts", "paper-machine press and dryer rolls", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder", "fan and pulley shafts that need periodic bearing removal in the field" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Mount the 90 mm bore 22218-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 22200-series series at 90 mm bore (160×40 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.", "The adapter sleeve is selected by actual shaft diameter, not by the 90 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 22218-ek with different sleeves.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 40 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "The 4550 g mass and 40 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 22218-ek.", "The 331/375 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22218 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22218-ek?", "a": "The SKF 22218 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 90 mm nominal bore, 160 mm outer diameter and 40 mm width (3.543 × 6.299 × 1.575 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 331 kN, C0 375 kN, Pu 39 kN, reference speed 3,800 r/min, limiting speed 5,300 r/min, mass about 4550 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 22218-ek?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 22218-ek?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 90 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 22218-ek driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 22218-ek and 22218?", "a": "They share the ISO 15 envelope and the same 331/375 kN ratings, but 22218-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22218 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "22218", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 22218; identical ISO 15 envelope, fits H318 adapter sleeve on a 80 mm shaft." }, { "equiv_sku": "C2218", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2218 shares the 90×160×40 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C2218-K", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2218 K shares the 90×160×40 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22218-EK", "SKF 22218 EK", "22218 K" ], "locale_variants": {} }, { "sku": "23218-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23218 CCK/W33", "series": "23200-series", "type": "spherical_roller", "d_mm": 90, "D_mm": 160, "B_mm": 52.4, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 372, "static_load_kN": 440, "fatigue_load_limit_kN": 48, "max_rpm": 3800, "reference_speed_rpm": 2800, "limiting_speed_rpm": 3800, "weight_g": 6000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF lists SKF 23218 CCK/W33 as the adapter-sleeve execution in the 23200-series range: a 90 mm nominal-bore spherical roller bearing whose 1:12 tapered inner ring is driven up a sleeve, with 160 mm OD and 52.4 mm width to the ISO 15 envelope. Reading the designation: the leading 2 marks a spherical roller bearing, the 32 is the ISO 15 dimension series (dimension series 32 (medium OD, extra wide)), and the last two digits encode the 90 mm bore; the 160 mm OD and 52.4 mm width follow the ISO 15 general plan. Reading the suffix on 23218-cck-w33, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 23218-cc-w33. Selection arithmetic: the C0/C ratio is about 1.18 (static 440 kN against dynamic 372 kN), typical of a spherical roller sized for heavy combined loads, and the 48 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Over-driving the 23218-cck-w33 up its sleeve pinches radial clearance below the residual minimum and can crack the inner ring in service; under-driving leaves the sleeve seat loose, so the ring creeps and frets the sleeve — measure, do not estimate.", "applications": [ "jaw and cone crusher main shafts", "paper-machine press and dryer rolls", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat", "split-housing plummer block arrangements with bearings swapped in situ" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Mount the 90 mm bore 23218-cck-w33 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 23200-series series at 90 mm bore (160×52.4 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 52.4 mm width changes abutment spacing, even though the 160 mm OD matches.", "The 23218-cck-w33 and its cylindrical-bore counterpart 23218-cc-w33 share envelope and load ratings (372/440 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "The adapter sleeve is selected by actual shaft diameter, not by the 90 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23218-cck-w33 with different sleeves.", "Shaft and housing fillets must clear the bearing chamfer so the 52.4 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 372/440 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23218 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23218-cck-w33?", "a": "The SKF 23218 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 90 mm nominal bore, 160 mm outer diameter and 52.4 mm width (3.543 × 6.299 × 2.063 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 372 kN, C0 440 kN, Pu 48 kN, reference speed 2,800 r/min, limiting speed 3,800 r/min, mass about 6000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23218-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23218-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 90 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23218-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23218-cck-w33 and 23218-cc-w33?", "a": "They share the ISO 15 envelope and the same 372/440 kN ratings, but 23218-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23218-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23218", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23218; identical ISO 15 envelope, fits H2318 adapter sleeve on a 80 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23218-CCK-W33", "SKF 23218 CCK/W33", "23218 K" ], "locale_variants": {} }, { "sku": "21318-EK", "brand": "SKF", "manufacturer_designation": "SKF 21318 EK", "series": "21300-series", "type": "spherical_roller", "d_mm": 90, "D_mm": 190, "B_mm": 43, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 393, "static_load_kN": 450, "fatigue_load_limit_kN": 45.5, "max_rpm": 4800, "reference_speed_rpm": 3600, "limiting_speed_rpm": 4800, "weight_g": 7250, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "21318-ek is the 1:12 tapered-bore execution of the 21300-series spherical roller bearing: the same two barrel-roller rows on a sphered outer raceway as 21318, but the inner-ring bore tapers 1 mm per 12 mm for adapter- or withdrawal-sleeve mounting, as listed by SKF in SKF catalogue PUB BU/P1 17000. Digit by digit, 21318-ek reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 13, and bore reference 18 resolving to 90 mm; 190 mm OD and 43 mm width are the matching ISO 15 boundary values. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. The 50.0 mm radial section height ((190−90)/2) and 7250 g catalogue mass frame a 90 mm bore bearing rated at 393 kN C — roughly 4.37 kN of dynamic capacity per millimetre of bore before application factors. At 90 mm bore, dismount after service is by KM locknut reversal or a hydraulic nut on larger sizes; oil-injection grooves on the bigger sleeves let pressurised oil float the 21318-ek off the taper without scoring either surface.", "applications": [ "rolling-mill pinion and back-up shafts", "large vibrating screens and feeders", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals" ], "pitfalls": [ "Mount the 90 mm bore 21318-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 21300-series series at 90 mm bore (190×43 mm) pairs a heavy OD with a narrow section — a compact way to add capacity, but the shoulder and abutment diameters differ from the 222 series; it is not a drop-in swap.", "The 21318-ek and its cylindrical-bore counterpart 21318 share envelope and load ratings (393/450 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 43 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 21318-ek pits long before its L10 life.", "The 393/450 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 21318 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 21318-ek?", "a": "The SKF 21318 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 90 mm nominal bore, 190 mm outer diameter and 43 mm width (3.543 × 7.48 × 1.693 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 393 kN, C0 450 kN, Pu 45.5 kN, reference speed 3,600 r/min, limiting speed 4,800 r/min, mass about 7250 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 21318-ek?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 21318-ek?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 90 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 21318-ek driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 21318-ek and 21318?", "a": "They share the ISO 15 envelope and the same 393/450 kN ratings, but 21318-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 21318 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "21318-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "21318", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 21318; identical ISO 15 envelope, fits H318 adapter sleeve on a 80 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "21318-EK", "SKF 21318 EK", "21318 K" ], "locale_variants": {} }, { "sku": "22318-EK", "brand": "SKF", "manufacturer_designation": "SKF 22318 EK", "series": "22300-series", "type": "spherical_roller", "d_mm": 90, "D_mm": 190, "B_mm": 64, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 637, "static_load_kN": 695, "fatigue_load_limit_kN": 67, "max_rpm": 3600, "reference_speed_rpm": 2600, "limiting_speed_rpm": 3600, "weight_g": 10500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF lists SKF 22318 EK as the adapter-sleeve execution in the 22300-series range: a 90 mm nominal-bore spherical roller bearing whose 1:12 tapered inner ring is driven up a sleeve, with 190 mm OD and 64 mm width to the ISO 15 envelope. Reading the designation: the leading 2 marks a spherical roller bearing, the 23 is the ISO 15 dimension series (dimension series 23 (heavy OD, wide)), and the last two digits encode the 90 mm bore; the 190 mm OD and 64 mm width follow the ISO 15 general plan. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. The 50.0 mm radial section height ((190−90)/2) and 10500 g catalogue mass frame a 90 mm bore bearing rated at 637 kN C — roughly 7.08 kN of dynamic capacity per millimetre of bore before application factors. Mounting on the 1:12 taper is controlled by clearance reduction or measured axial drive-up, never by locknut torque: SKF tables give the target radial-clearance decrease for the 90 mm 22318-ek, checked with feeler gauges before and after drive-up.", "applications": [ "rolling-mill pinion and back-up shafts", "large vibrating screens and feeders", "split-housing plummer block arrangements with bearings swapped in situ", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Mount the 90 mm bore 22318-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 22300-series series at 90 mm bore (190×64 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 3,600 r/min ceiling.", "The 22318-ek and its cylindrical-bore counterpart 22318 share envelope and load ratings (637/695 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 64 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 22318-ek; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 637/695 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22318 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22318-ek?", "a": "The SKF 22318 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 90 mm nominal bore, 190 mm outer diameter and 64 mm width (3.543 × 7.48 × 2.52 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 637 kN, C0 695 kN, Pu 67 kN, reference speed 2,600 r/min, limiting speed 3,600 r/min, mass about 10500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 22318-ek?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 22318-ek?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 90 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 22318-ek driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 22318-ek and 22318?", "a": "They share the ISO 15 envelope and the same 637/695 kN ratings, but 22318-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22318 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "22318", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 22318; identical ISO 15 envelope, fits H2318 adapter sleeve on a 80 mm shaft." }, { "equiv_sku": "C2318", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2318 shares the 90×190×64 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C2318-K", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2318 K shares the 90×190×64 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22318-EK", "SKF 22318 EK", "22318 K" ], "locale_variants": {} }, { "sku": "22219-EK", "brand": "SKF", "manufacturer_designation": "SKF 22219 EK", "series": "22200-series", "type": "spherical_roller", "d_mm": 95, "D_mm": 170, "B_mm": 43, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 393, "static_load_kN": 450, "fatigue_load_limit_kN": 45.5, "max_rpm": 4800, "reference_speed_rpm": 3600, "limiting_speed_rpm": 4800, "weight_g": 5450, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 22219-ek denotes the tapered-bore version (K suffix, taper 1:12) of the 22200-series spherical roller bearing: dimensioned 95×170×43 mm, it seats on an adapter or withdrawal sleeve rather than directly on a machined journal. The code breaks down as type digit 2 (double-row spherical roller), dimension series 22 (dimension series 22 (medium OD, wide)), and bore code 19 = 95 mm; dimensions 95×170×43 mm therefore match the ISO 15 envelope. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. At 3,600 r/min reference speed the 37.5 mm-section 22219-ek is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 4,800 r/min as the mechanical ceiling. Mounting on the 1:12 taper is controlled by clearance reduction or measured axial drive-up, never by locknut torque: SKF tables give the target radial-clearance decrease for the 95 mm 22219-ek, checked with feeler gauges before and after drive-up.", "applications": [ "heavy conveyor head shafts in mining", "jaw and cone crusher main shafts", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder", "fan and pulley shafts that need periodic bearing removal in the field" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals" ], "pitfalls": [ "Mount the 95 mm bore 22219-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 22200-series series at 95 mm bore (170×43 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 22219-ek to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 22219-ek to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 22219-ek; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 393/450 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22219 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22219-ek?", "a": "The SKF 22219 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 95 mm nominal bore, 170 mm outer diameter and 43 mm width (3.74 × 6.693 × 1.693 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 393 kN, C0 450 kN, Pu 45.5 kN, reference speed 3,600 r/min, limiting speed 4,800 r/min, mass about 5450 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 22219-ek?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 22219-ek?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 95 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 22219-ek driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 22219-ek and 22219?", "a": "They share the ISO 15 envelope and the same 393/450 kN ratings, but 22219-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22219 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "22219", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 22219; identical ISO 15 envelope, fits H319 adapter sleeve on a 85 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22219-EK", "SKF 22219 EK", "22219 K" ], "locale_variants": {} }, { "sku": "21319-EK", "brand": "SKF", "manufacturer_designation": "SKF 21319 EK", "series": "21300-series", "type": "spherical_roller", "d_mm": 95, "D_mm": 200, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 433, "static_load_kN": 490, "fatigue_load_limit_kN": 49, "max_rpm": 4500, "reference_speed_rpm": 3400, "limiting_speed_rpm": 4500, "weight_g": 8250, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For sleeve mounting on a 95 mm shaft, SKF order number SKF 21319 EK is the 1:12 tapered-bore spherical roller bearing in the 21300-series family (dimension series 13 (heavy OD, normal width)); the cylindrical-bore equivalent is a separate order number, 21319. The code breaks down as type digit 2 (double-row spherical roller), dimension series 13 (dimension series 13 (heavy OD, normal width)), and bore code 19 = 95 mm; dimensions 95×200×45 mm therefore match the ISO 15 envelope. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. The 52.5 mm radial section height ((200−95)/2) and 8250 g catalogue mass frame a 95 mm bore bearing rated at 433 kN C — roughly 4.56 kN of dynamic capacity per millimetre of bore before application factors. At 95 mm bore, dismount after service is by KM locknut reversal or a hydraulic nut on larger sizes; oil-injection grooves on the bigger sleeves let pressurised oil float the 21319-ek off the taper without scoring either surface.", "applications": [ "rolling-mill pinion and back-up shafts", "large vibrating screens and feeders", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Mount the 95 mm bore 21319-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 21300-series series at 95 mm bore (200×45 mm) pairs a heavy OD with a narrow section — a compact way to add capacity, but the shoulder and abutment diameters differ from the 222 series; it is not a drop-in swap.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 45 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "The adapter sleeve is selected by actual shaft diameter, not by the 95 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 21319-ek with different sleeves.", "Catalogue reference speed and limiting speed are different limits: the 3,400 r/min reference is a thermal criterion under load, while the 4,500 r/min limiting value is the mechanical ceiling — observe both.", "The 433/490 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 21319 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 21319-ek?", "a": "The SKF 21319 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 95 mm nominal bore, 200 mm outer diameter and 45 mm width (3.74 × 7.874 × 1.772 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 433 kN, C0 490 kN, Pu 49 kN, reference speed 3,400 r/min, limiting speed 4,500 r/min, mass about 8250 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 21319-ek?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 21319-ek?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 95 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 21319-ek driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 21319-ek and 21319?", "a": "They share the ISO 15 envelope and the same 433/490 kN ratings, but 21319-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 21319 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "21319-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "21319", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 21319; identical ISO 15 envelope, fits H319 adapter sleeve on a 85 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "21319-EK", "SKF 21319 EK", "21319 K" ], "locale_variants": {} }, { "sku": "22319-EK", "brand": "SKF", "manufacturer_designation": "SKF 22319 EK", "series": "22300-series", "type": "spherical_roller", "d_mm": 95, "D_mm": 200, "B_mm": 67, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 699, "static_load_kN": 765, "fatigue_load_limit_kN": 73.5, "max_rpm": 3400, "reference_speed_rpm": 2600, "limiting_speed_rpm": 3400, "weight_g": 12000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The SKF 22319 EK is a 95×200×67 mm spherical roller bearing with a 1:12 tapered bore — SKF catalogue execution for sleeve mounting on a 95 mm plain shaft, retaining the double-row self-aligning barrel-roller design. On the SKF nameplate, 22319-ek follows the ISO 15 convention: 2 for the spherical roller type, 23 for the dimension series 23 (heavy OD, wide), final digits 19 for the 95 mm bore. Reading the suffix on 22319-ek, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 22319. The 52.5 mm radial section height ((200−95)/2) and 12000 g catalogue mass frame a 95 mm bore bearing rated at 699 kN C — roughly 7.36 kN of dynamic capacity per millimetre of bore before application factors. Mounting on the 1:12 taper is controlled by clearance reduction or measured axial drive-up, never by locknut torque: SKF tables give the target radial-clearance decrease for the 95 mm 22319-ek, checked with feeler gauges before and after drive-up.", "applications": [ "rolling-mill pinion and back-up shafts", "large vibrating screens and feeders", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "smearing on the roller-raceway contact during skid starts below the minimum load" ], "pitfalls": [ "Mount the 95 mm bore 22319-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 22300-series series at 95 mm bore (200×67 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 3,400 r/min ceiling.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 67 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "The adapter sleeve is selected by actual shaft diameter, not by the 95 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 22319-ek with different sleeves.", "The 12000 g mass and 67 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 22319-ek.", "The 699/765 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22319 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22319-ek?", "a": "The SKF 22319 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 95 mm nominal bore, 200 mm outer diameter and 67 mm width (3.74 × 7.874 × 2.638 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 699 kN, C0 765 kN, Pu 73.5 kN, reference speed 2,600 r/min, limiting speed 3,400 r/min, mass about 12000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 22319-ek?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 22319-ek?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 95 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 22319-ek driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 22319-ek and 22319?", "a": "They share the ISO 15 envelope and the same 699/765 kN ratings, but 22319-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22319 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "22319", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 22319; identical ISO 15 envelope, fits H2319 adapter sleeve on a 85 mm shaft." }, { "equiv_sku": "C2319", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2319 shares the 95×200×67 mm envelope but catalogue C/C0 differ (610/695 kN vs 699/765 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C2319-K", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2319 K shares the 95×200×67 mm envelope but catalogue C/C0 differ (610/695 kN vs 699/765 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22319-EK", "SKF 22319 EK", "22319 K" ], "locale_variants": {} }, { "sku": "23120-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23120 CCK/W33", "series": "23100-series", "type": "spherical_roller", "d_mm": 100, "D_mm": 165, "B_mm": 52, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 385, "static_load_kN": 490, "fatigue_load_limit_kN": 53, "max_rpm": 4000, "reference_speed_rpm": 3000, "limiting_speed_rpm": 4000, "weight_g": 6150, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF 23120 CCK/W33 in SKF catalogue PUB BU/P1 17000 is a double-row spherical roller bearing with a tapered bore (1:12), intended for an H-series adapter sleeve or AH withdrawal sleeve, with two pressed-steel cages with a floating guide ring and the same 100×165×52 mm ISO 15 outline as its cylindrical-bore counterpart. Reading the designation: the leading 2 marks a spherical roller bearing, the 31 is the ISO 15 dimension series (dimension series 31 (medium OD, wide)), and the last two digits encode the 100 mm bore; the 165 mm OD and 52 mm width follow the ISO 15 general plan. Reading the suffix on 23120-cck-w33, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 23120-cc-w33. Speed planning uses two different ceilings: 3,000 r/min thermal reference and 4,000 r/min mechanical limiting speed. Over-driving the 23120-cck-w33 up its sleeve pinches radial clearance below the residual minimum and can crack the inner ring in service; under-driving leaves the sleeve seat loose, so the ring creeps and frets the sleeve — measure, do not estimate.", "applications": [ "paper-machine press and dryer rolls", "rolling-mill pinion and back-up shafts", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat", "split-housing plummer block arrangements with bearings swapped in situ" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "smearing on the roller-raceway contact during skid starts below the minimum load" ], "pitfalls": [ "Mount the 100 mm bore 23120-cck-w33 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 23100-series series at 100 mm bore (165×52 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23120-cck-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "The 23120-cck-w33 and its cylindrical-bore counterpart 23120-cc-w33 share envelope and load ratings (385/490 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 385/490 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23120 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23120-cck-w33?", "a": "The SKF 23120 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 100 mm nominal bore, 165 mm outer diameter and 52 mm width (3.937 × 6.496 × 2.047 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 385 kN, C0 490 kN, Pu 53 kN, reference speed 3,000 r/min, limiting speed 4,000 r/min, mass about 6150 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23120-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23120-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 100 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23120-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23120-cck-w33 and 23120-cc-w33?", "a": "They share the ISO 15 envelope and the same 385/490 kN ratings, but 23120-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23120-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23120", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23120; identical ISO 15 envelope, fits H3120 adapter sleeve on a 90 mm shaft." }, { "equiv_sku": "C3120-V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 3120 V shares the 100×165×52 mm envelope but catalogue C/C0 differ (475/655 kN vs 385/490 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23120-CCK-W33", "SKF 23120 CCK/W33", "23120 K" ], "locale_variants": {} }, { "sku": "22220-EK", "brand": "SKF", "manufacturer_designation": "SKF 22220 EK", "series": "22200-series", "type": "spherical_roller", "d_mm": 100, "D_mm": 180, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 433, "static_load_kN": 490, "fatigue_load_limit_kN": 49, "max_rpm": 4500, "reference_speed_rpm": 3400, "limiting_speed_rpm": 4500, "weight_g": 6400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The SKF 22220 EK is a 100×180×46 mm spherical roller bearing with a 1:12 tapered bore — SKF catalogue execution for sleeve mounting on a 100 mm plain shaft, retaining the double-row self-aligning barrel-roller design. The code breaks down as type digit 2 (double-row spherical roller), dimension series 22 (dimension series 22 (medium OD, wide)), and bore code 20 = 100 mm; dimensions 100×180×46 mm therefore match the ISO 15 envelope. Reading the suffix on 22220-ek, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 22220. Selection arithmetic: the C0/C ratio is about 1.13 (static 490 kN against dynamic 433 kN), typical of a spherical roller sized for heavy combined loads, and the 49 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Over-driving the 22220-ek up its sleeve pinches radial clearance below the residual minimum and can crack the inner ring in service; under-driving leaves the sleeve seat loose, so the ring creeps and frets the sleeve — measure, do not estimate.", "applications": [ "jaw and cone crusher main shafts", "paper-machine press and dryer rolls", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat", "split-housing plummer block arrangements with bearings swapped in situ" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "smearing on the roller-raceway contact during skid starts below the minimum load" ], "pitfalls": [ "Mount the 100 mm bore 22220-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 22200-series series at 100 mm bore (180×46 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 46 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "The adapter sleeve is selected by actual shaft diameter, not by the 100 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 22220-ek with different sleeves.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 433/490 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22220 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22220-ek?", "a": "The SKF 22220 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 100 mm nominal bore, 180 mm outer diameter and 46 mm width (3.937 × 7.087 × 1.811 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 433 kN, C0 490 kN, Pu 49 kN, reference speed 3,400 r/min, limiting speed 4,500 r/min, mass about 6400 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 22220-ek?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 22220-ek?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 100 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 22220-ek driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 22220-ek and 22220?", "a": "They share the ISO 15 envelope and the same 433/490 kN ratings, but 22220-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22220 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "22220", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 22220; identical ISO 15 envelope, fits H320 adapter sleeve on a 90 mm shaft." }, { "equiv_sku": "C2220", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2220 shares the 100×180×46 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C2220-K", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2220 K shares the 100×180×46 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22220-EK", "SKF 22220 EK", "22220 K" ], "locale_variants": {} }, { "sku": "23220-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23220 CCK/W33", "series": "23200-series", "type": "spherical_roller", "d_mm": 100, "D_mm": 180, "B_mm": 60.3, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 498, "static_load_kN": 600, "fatigue_load_limit_kN": 63, "max_rpm": 3400, "reference_speed_rpm": 2400, "limiting_speed_rpm": 3400, "weight_g": 8750, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF 23220 CCK/W33 in SKF catalogue PUB BU/P1 17000 is a double-row spherical roller bearing with a tapered bore (1:12), intended for an H-series adapter sleeve or AH withdrawal sleeve, with two pressed-steel cages with a floating guide ring and the same 100×180×60.3 mm ISO 15 outline as its cylindrical-bore counterpart. Digit by digit, 23220-cck-w33 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 32, and bore reference 20 resolving to 100 mm; 180 mm OD and 60.3 mm width are the matching ISO 15 boundary values. The K in the designation marks the 1:12 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. At 2,400 r/min reference speed the 40.0 mm-section 23220-cck-w33 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 3,400 r/min as the mechanical ceiling. At 100 mm bore, dismount after service is by KM locknut reversal or a hydraulic nut on larger sizes; oil-injection grooves on the bigger sleeves let pressurised oil float the 23220-cck-w33 off the taper without scoring either surface.", "applications": [ "heavy conveyor head shafts in mining", "jaw and cone crusher main shafts", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Mount the 100 mm bore 23220-cck-w33 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 23200-series series at 100 mm bore (180×60.3 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 60.3 mm width changes abutment spacing, even though the 180 mm OD matches.", "The 23220-cck-w33 and its cylindrical-bore counterpart 23220-cc-w33 share envelope and load ratings (498/600 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23220-cck-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "Shaft and housing fillets must clear the bearing chamfer so the 60.3 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 498/600 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23220 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23220-cck-w33?", "a": "The SKF 23220 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 100 mm nominal bore, 180 mm outer diameter and 60.3 mm width (3.937 × 7.087 × 2.374 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 498 kN, C0 600 kN, Pu 63 kN, reference speed 2,400 r/min, limiting speed 3,400 r/min, mass about 8750 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23220-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23220-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 100 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23220-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23220-cck-w33 and 23220-cc-w33?", "a": "They share the ISO 15 envelope and the same 498/600 kN ratings, but 23220-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23220-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23220", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23220; identical ISO 15 envelope, fits H2320 adapter sleeve on a 90 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23220-CCK-W33", "SKF 23220 CCK/W33", "23220 K" ], "locale_variants": {} }, { "sku": "21320-EK", "brand": "SKF", "manufacturer_designation": "SKF 21320 EK", "series": "21300-series", "type": "spherical_roller", "d_mm": 100, "D_mm": 215, "B_mm": 47, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 433, "static_load_kN": 490, "fatigue_load_limit_kN": 49, "max_rpm": 4500, "reference_speed_rpm": 3400, "limiting_speed_rpm": 4500, "weight_g": 10500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 21320-ek denotes the tapered-bore version (K suffix, taper 1:12) of the 21300-series spherical roller bearing: dimensioned 100×215×47 mm, it seats on an adapter or withdrawal sleeve rather than directly on a machined journal. Digit by digit, 21320-ek reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 13, and bore reference 20 resolving to 100 mm; 215 mm OD and 47 mm width are the matching ISO 15 boundary values. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. With C 433 kN and C0 490 kN, the 21320-ek load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. Over-driving the 21320-ek up its sleeve pinches radial clearance below the residual minimum and can crack the inner ring in service; under-driving leaves the sleeve seat loose, so the ring creeps and frets the sleeve — measure, do not estimate.", "applications": [ "large vibrating screens and feeders", "marine propulsion and thruster shafts", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Mount the 100 mm bore 21320-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 21300-series series at 100 mm bore (215×47 mm) pairs a heavy OD with a narrow section — a compact way to add capacity, but the shoulder and abutment diameters differ from the 222 series; it is not a drop-in swap.", "The adapter sleeve is selected by actual shaft diameter, not by the 100 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 21320-ek with different sleeves.", "The adapter sleeve is selected by actual shaft diameter, not by the 100 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 21320-ek with different sleeves.", "Shaft and housing fillets must clear the bearing chamfer so the 47 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 433/490 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 21320 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 21320-ek?", "a": "The SKF 21320 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 100 mm nominal bore, 215 mm outer diameter and 47 mm width (3.937 × 8.465 × 1.85 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 433 kN, C0 490 kN, Pu 49 kN, reference speed 3,400 r/min, limiting speed 4,500 r/min, mass about 10500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 21320-ek?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 21320-ek?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 100 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 21320-ek driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 21320-ek and 21320?", "a": "They share the ISO 15 envelope and the same 433/490 kN ratings, but 21320-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 21320 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "21320-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "21320", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 21320; identical ISO 15 envelope, fits H320 adapter sleeve on a 90 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "21320-EK", "SKF 21320 EK", "21320 K" ], "locale_variants": {} }, { "sku": "22320-EK", "brand": "SKF", "manufacturer_designation": "SKF 22320 EK", "series": "22300-series", "type": "spherical_roller", "d_mm": 100, "D_mm": 215, "B_mm": 73, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 847, "static_load_kN": 950, "fatigue_load_limit_kN": 88, "max_rpm": 3000, "reference_speed_rpm": 2400, "limiting_speed_rpm": 3000, "weight_g": 15000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF 22320 EK in SKF catalogue PUB BU/P1 17000 is a double-row spherical roller bearing with a tapered bore (1:12), intended for an H-series adapter sleeve or AH withdrawal sleeve, with two pressed-steel cages with a floating guide ring and the same 100×215×73 mm ISO 15 outline as its cylindrical-bore counterpart. Reading the designation: the leading 2 marks a spherical roller bearing, the 23 is the ISO 15 dimension series (dimension series 23 (heavy OD, wide)), and the last two digits encode the 100 mm bore; the 215 mm OD and 73 mm width follow the ISO 15 general plan. Reading the suffix on 22320-ek, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 22320. With C 847 kN and C0 950 kN, the 22320-ek load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. After drive-up, re-check radial clearance and then swing the outer ring through its self-aligning range: the sphered raceway of the 22320-ek must still tilt ≈ 0.5–2.5° freely — a joint that binds after sleeve mounting signals excessive drive-up or a cocked sleeve.", "applications": [ "large vibrating screens and feeders", "marine propulsion and thruster shafts", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "smearing on the roller-raceway contact during skid starts below the minimum load" ], "pitfalls": [ "Mount the 100 mm bore 22320-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 22300-series series at 100 mm bore (215×73 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 3,000 r/min ceiling.", "The adapter sleeve is selected by actual shaft diameter, not by the 100 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 22320-ek with different sleeves.", "The adapter sleeve is selected by actual shaft diameter, not by the 100 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 22320-ek with different sleeves.", "Catalogue reference speed and limiting speed are different limits: the 2,400 r/min reference is a thermal criterion under load, while the 3,000 r/min limiting value is the mechanical ceiling — observe both.", "The 847/950 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22320 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22320-ek?", "a": "The SKF 22320 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 100 mm nominal bore, 215 mm outer diameter and 73 mm width (3.937 × 8.465 × 2.874 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 847 kN, C0 950 kN, Pu 88 kN, reference speed 2,400 r/min, limiting speed 3,000 r/min, mass about 15000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 22320-ek?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 22320-ek?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 100 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 22320-ek driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 22320-ek and 22320?", "a": "They share the ISO 15 envelope and the same 847/950 kN ratings, but 22320-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22320 has a cylindrical bore for direct mounting on a machined interference journal (typically k5 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "22320", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 22320; identical ISO 15 envelope, fits H2320 adapter sleeve on a 90 mm shaft." }, { "equiv_sku": "C2320", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2320 shares the 100×215×73 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C2320-K", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2320 K shares the 100×215×73 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22320-EK", "SKF 22320 EK", "22320 K" ], "locale_variants": {} }, { "sku": "23022-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23022 CCK/W33", "series": "23000-series", "type": "spherical_roller", "d_mm": 110, "D_mm": 170, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 326, "static_load_kN": 440, "fatigue_load_limit_kN": 46.5, "max_rpm": 4300, "reference_speed_rpm": 3400, "limiting_speed_rpm": 4300, "weight_g": 5750, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For sleeve mounting on a 110 mm shaft, SKF order number SKF 23022 CCK/W33 is the 1:12 tapered-bore spherical roller bearing in the 23000-series family (dimension series 30 (slim OD, extra-wide)); the cylindrical-bore equivalent is a separate order number, 23022-cc-w33. Digit by digit, 23022-cck-w33 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 30, and bore reference 22 resolving to 110 mm; 170 mm OD and 45 mm width are the matching ISO 15 boundary values. Reading the suffix on 23022-cck-w33, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 23022-cc-w33. At 3,400 r/min reference speed the 30.0 mm-section 23022-cck-w33 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 4,300 r/min as the mechanical ceiling. After drive-up, re-check radial clearance and then swing the outer ring through its self-aligning range: the sphered raceway of the 23022-cck-w33 must still tilt ≈ 0.5–2.5° freely — a joint that binds after sleeve mounting signals excessive drive-up or a cocked sleeve.", "applications": [ "heavy conveyor head shafts in mining", "jaw and cone crusher main shafts", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat", "split-housing plummer block arrangements with bearings swapped in situ" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Mount the 110 mm bore 23022-cck-w33 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 23000-series series at 110 mm bore (170×45 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "The 23022-cck-w33 and its cylindrical-bore counterpart 23022-cc-w33 share envelope and load ratings (326/440 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23022-cck-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "The 23022-cck-w33 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 326/440 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The 326/440 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23022 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23022-cck-w33?", "a": "The SKF 23022 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 110 mm nominal bore, 170 mm outer diameter and 45 mm width (4.331 × 6.693 × 1.772 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 326 kN, C0 440 kN, Pu 46.5 kN, reference speed 3,400 r/min, limiting speed 4,300 r/min, mass about 5750 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23022-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23022-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 110 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23022-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23022-cck-w33 and 23022-cc-w33?", "a": "They share the ISO 15 envelope and the same 326/440 kN ratings, but 23022-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23022-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23022", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23022; identical ISO 15 envelope, fits H322 adapter sleeve on a 100 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23022-CCK-W33", "SKF 23022 CCK/W33", "23022 K" ], "locale_variants": {} }, { "sku": "23122-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23122 CCK/W33", "series": "23100-series", "type": "spherical_roller", "d_mm": 110, "D_mm": 180, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 450, "static_load_kN": 585, "fatigue_load_limit_kN": 61, "max_rpm": 3600, "reference_speed_rpm": 2800, "limiting_speed_rpm": 3600, "weight_g": 7700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF 23122 CCK/W33 in SKF catalogue PUB BU/P1 17000 is a double-row spherical roller bearing with a tapered bore (1:12), intended for an H-series adapter sleeve or AH withdrawal sleeve, with two pressed-steel cages with a floating guide ring and the same 110×180×56 mm ISO 15 outline as its cylindrical-bore counterpart. Numbering ties the bearing to its envelope: 23122-cck-w33 means spherical-roller type, dimension series 31, 110 mm bore — which is why the 180×56 mm outline swaps dimensionally with other ISO 15 bearings of the same code. Reading the suffix on 23122-cck-w33, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 23122-cc-w33. Catalogue mass 7700 g for the 110×180×56 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. For shafts with a locating shoulder, use an AH withdrawal sleeve instead of an adapter sleeve: the bearing presses against the shoulder and the sleeve is drawn out for dismounting, making the 23122-cck-w33 removable without an induction heater.", "applications": [ "marine propulsion and thruster shafts", "cement-mill trunnion and drive shafts", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder", "fan and pulley shafts that need periodic bearing removal in the field" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Mount the 110 mm bore 23122-cck-w33 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 23100-series series at 110 mm bore (180×56 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 56 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "The adapter sleeve is selected by actual shaft diameter, not by the 110 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23122-cck-w33 with different sleeves.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 450/585 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23122 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23122-cck-w33?", "a": "The SKF 23122 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 110 mm nominal bore, 180 mm outer diameter and 56 mm width (4.331 × 7.087 × 2.205 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 450 kN, C0 585 kN, Pu 61 kN, reference speed 2,800 r/min, limiting speed 3,600 r/min, mass about 7700 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23122-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23122-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 110 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23122-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23122-cck-w33 and 23122-cc-w33?", "a": "They share the ISO 15 envelope and the same 450/585 kN ratings, but 23122-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23122-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23122", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23122; identical ISO 15 envelope, fits H3122 adapter sleeve on a 100 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23122-CCK-W33", "SKF 23122 CCK/W33", "23122 K" ], "locale_variants": {} }, { "sku": "22222-EK", "brand": "SKF", "manufacturer_designation": "SKF 22222 EK", "series": "22200-series", "type": "spherical_roller", "d_mm": 110, "D_mm": 200, "B_mm": 53, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 572, "static_load_kN": 640, "fatigue_load_limit_kN": 63, "max_rpm": 4000, "reference_speed_rpm": 3000, "limiting_speed_rpm": 4000, "weight_g": 8900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF lists SKF 22222 EK as the adapter-sleeve execution in the 22200-series range: a 110 mm nominal-bore spherical roller bearing whose 1:12 tapered inner ring is driven up a sleeve, with 200 mm OD and 53 mm width to the ISO 15 envelope. Reading the designation: the leading 2 marks a spherical roller bearing, the 22 is the ISO 15 dimension series (dimension series 22 (medium OD, wide)), and the last two digits encode the 110 mm bore; the 200 mm OD and 53 mm width follow the ISO 15 general plan. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. At 3,000 r/min reference speed the 45.0 mm-section 22222-ek is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 4,000 r/min as the mechanical ceiling. On an H adapter sleeve the 110 mm shaft seat only needs an h9 plain journal; slide the sleeve into the 22222-ek inner ring, tighten the KM nut against the MB washer until the catalogue clearance-reduction value is reached, then lock the washer tab.", "applications": [ "heavy conveyor head shafts in mining", "jaw and cone crusher main shafts", "split-housing plummer block arrangements with bearings swapped in situ", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still" ], "pitfalls": [ "Mount the 110 mm bore 22222-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 22200-series series at 110 mm bore (200×53 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 22222-ek to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 53 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 572/640 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22222 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22222-ek?", "a": "The SKF 22222 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 110 mm nominal bore, 200 mm outer diameter and 53 mm width (4.331 × 7.874 × 2.087 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 572 kN, C0 640 kN, Pu 63 kN, reference speed 3,000 r/min, limiting speed 4,000 r/min, mass about 8900 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 22222-ek?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 22222-ek?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 110 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 22222-ek driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 22222-ek and 22222?", "a": "They share the ISO 15 envelope and the same 572/640 kN ratings, but 22222-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22222 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "22222", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 22222; identical ISO 15 envelope, fits H322 adapter sleeve on a 100 mm shaft." }, { "equiv_sku": "C2222", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2222 shares the 110×200×53 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C2222-K", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2222 K shares the 110×200×53 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22222-EK", "SKF 22222 EK", "22222 K" ], "locale_variants": {} }, { "sku": "23222-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23222 CCK/W33", "series": "23200-series", "type": "spherical_roller", "d_mm": 110, "D_mm": 200, "B_mm": 69.8, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 626, "static_load_kN": 765, "fatigue_load_limit_kN": 76.5, "max_rpm": 3200, "reference_speed_rpm": 2200, "limiting_speed_rpm": 3200, "weight_g": 12500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "23222-cck-w33 is the 1:12 tapered-bore execution of the 23200-series spherical roller bearing: the same two barrel-roller rows on a sphered outer raceway as 23222-cc-w33, but the inner-ring bore tapers 1 mm per 12 mm for adapter- or withdrawal-sleeve mounting, as listed by SKF in SKF catalogue PUB BU/P1 17000. On the SKF nameplate, 23222-cck-w33 follows the ISO 15 convention: 2 for the spherical roller type, 32 for the dimension series 32 (medium OD, extra wide), final digits 22 for the 110 mm bore. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. With C 626 kN and C0 765 kN, the 23222-cck-w33 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. Over-driving the 23222-cck-w33 up its sleeve pinches radial clearance below the residual minimum and can crack the inner ring in service; under-driving leaves the sleeve seat loose, so the ring creeps and frets the sleeve — measure, do not estimate.", "applications": [ "large vibrating screens and feeders", "marine propulsion and thruster shafts", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still" ], "pitfalls": [ "Mount the 110 mm bore 23222-cck-w33 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 23200-series series at 110 mm bore (200×69.8 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 69.8 mm width changes abutment spacing, even though the 200 mm OD matches.", "The adapter sleeve is selected by actual shaft diameter, not by the 110 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23222-cck-w33 with different sleeves.", "The 23222-cck-w33 and its cylindrical-bore counterpart 23222-cc-w33 share envelope and load ratings (626/765 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23222-cck-w33 pits long before its L10 life.", "The 626/765 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23222 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23222-cck-w33?", "a": "The SKF 23222 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 110 mm nominal bore, 200 mm outer diameter and 69.8 mm width (4.331 × 7.874 × 2.748 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 626 kN, C0 765 kN, Pu 76.5 kN, reference speed 2,200 r/min, limiting speed 3,200 r/min, mass about 12500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23222-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23222-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 110 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23222-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23222-cck-w33 and 23222-cc-w33?", "a": "They share the ISO 15 envelope and the same 626/765 kN ratings, but 23222-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23222-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23222", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23222; identical ISO 15 envelope, fits H2322 adapter sleeve on a 100 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23222-CCK-W33", "SKF 23222 CCK/W33", "23222 K" ], "locale_variants": {} }, { "sku": "22322-EK", "brand": "SKF", "manufacturer_designation": "SKF 22322 EK", "series": "22300-series", "type": "spherical_roller", "d_mm": 110, "D_mm": 240, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 989, "static_load_kN": 1120, "fatigue_load_limit_kN": 100, "max_rpm": 2800, "reference_speed_rpm": 2000, "limiting_speed_rpm": 2800, "weight_g": 21000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The SKF 22322 EK is a 110×240×80 mm spherical roller bearing with a 1:12 tapered bore — SKF catalogue execution for sleeve mounting on a 110 mm plain shaft, retaining the double-row self-aligning barrel-roller design. The code breaks down as type digit 2 (double-row spherical roller), dimension series 23 (dimension series 23 (heavy OD, wide)), and bore code 22 = 110 mm; dimensions 110×240×80 mm therefore match the ISO 15 envelope. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. Speed planning uses two different ceilings: 2,000 r/min thermal reference and 2,800 r/min mechanical limiting speed. At 110 mm bore, dismount after service is by KM locknut reversal or a hydraulic nut on larger sizes; oil-injection grooves on the bigger sleeves let pressurised oil float the 22322-ek off the taper without scoring either surface.", "applications": [ "paper-machine press and dryer rolls", "rolling-mill pinion and back-up shafts", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still" ], "pitfalls": [ "Mount the 110 mm bore 22322-ek by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 22300-series series at 110 mm bore (240×80 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 2,800 r/min ceiling.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 80 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 80 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "Catalogue reference speed and limiting speed are different limits: the 2,000 r/min reference is a thermal criterion under load, while the 2,800 r/min limiting value is the mechanical ceiling — observe both.", "The 989/1120 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22322 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22322-ek?", "a": "The SKF 22322 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 110 mm nominal bore, 240 mm outer diameter and 80 mm width (4.331 × 9.449 × 3.15 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 989 kN, C0 1120 kN, Pu 100 kN, reference speed 2,000 r/min, limiting speed 2,800 r/min, mass about 21000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 22322-ek?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 22322-ek?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 110 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 22322-ek driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 22322-ek and 22322?", "a": "They share the ISO 15 envelope and the same 989/1120 kN ratings, but 22322-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22322 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "22322", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 22322; identical ISO 15 envelope, fits H2322 adapter sleeve on a 100 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22322-EK", "SKF 22322 EK", "22322 K" ], "locale_variants": {} }, { "sku": "23024-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23024 CCK/W33", "series": "23000-series", "type": "spherical_roller", "d_mm": 120, "D_mm": 180, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 366, "static_load_kN": 500, "fatigue_load_limit_kN": 52, "max_rpm": 4000, "reference_speed_rpm": 3200, "limiting_speed_rpm": 4000, "weight_g": 5950, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF 23024 CCK/W33 in SKF catalogue PUB BU/P1 17000 is a double-row spherical roller bearing with a tapered bore (1:12), intended for an H-series adapter sleeve or AH withdrawal sleeve, with two pressed-steel cages with a floating guide ring and the same 120×180×46 mm ISO 15 outline as its cylindrical-bore counterpart. On the SKF nameplate, 23024-cck-w33 follows the ISO 15 convention: 2 for the spherical roller type, 30 for the dimension series 30 (slim OD, extra-wide), final digits 24 for the 120 mm bore. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. The 30.0 mm radial section height ((180−120)/2) and 5950 g catalogue mass frame a 120 mm bore bearing rated at 366 kN C — roughly 3.05 kN of dynamic capacity per millimetre of bore before application factors. Over-driving the 23024-cck-w33 up its sleeve pinches radial clearance below the residual minimum and can crack the inner ring in service; under-driving leaves the sleeve seat loose, so the ring creeps and frets the sleeve — measure, do not estimate.", "applications": [ "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "fan and pulley shafts that need periodic bearing removal in the field", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still" ], "pitfalls": [ "At 120 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23000-series series at 120 mm bore (180×46 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "The adapter sleeve is selected by actual shaft diameter, not by the 120 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23024-cck-w33 with different sleeves.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 46 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "The 23024-cck-w33 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 366/500 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The 366/500 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23024 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23024-cck-w33?", "a": "The SKF 23024 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 120 mm nominal bore, 180 mm outer diameter and 46 mm width (4.724 × 7.087 × 1.811 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 366 kN, C0 500 kN, Pu 52 kN, reference speed 3,200 r/min, limiting speed 4,000 r/min, mass about 5950 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23024-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23024-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 120 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23024-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23024-cck-w33 and 23024-cc-w33?", "a": "They share the ISO 15 envelope and the same 366/500 kN ratings, but 23024-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23024-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23024", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23024; identical ISO 15 envelope, fits H3024 adapter sleeve on a 110 mm shaft." }, { "equiv_sku": "C3024-V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 3024 V shares the 120×180×46 mm envelope but catalogue C/C0 differ (430/640 kN vs 366/500 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23024-CCK-W33", "SKF 23024 CCK/W33", "23024 K" ], "locale_variants": {} }, { "sku": "23124-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23124 CCK/W33", "series": "23100-series", "type": "spherical_roller", "d_mm": 120, "D_mm": 200, "B_mm": 62, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 534, "static_load_kN": 695, "fatigue_load_limit_kN": 71, "max_rpm": 3400, "reference_speed_rpm": 2600, "limiting_speed_rpm": 3400, "weight_g": 10000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "23124-cck-w33 is the 1:12 tapered-bore execution of the 23100-series spherical roller bearing: the same two barrel-roller rows on a sphered outer raceway as 23124-cc-w33, but the inner-ring bore tapers 1 mm per 12 mm for adapter- or withdrawal-sleeve mounting, as listed by SKF in SKF catalogue PUB BU/P1 17000. The code breaks down as type digit 2 (double-row spherical roller), dimension series 31 (dimension series 31 (medium OD, wide)), and bore code 24 = 120 mm; dimensions 120×200×62 mm therefore match the ISO 15 envelope. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. Selection arithmetic: the C0/C ratio is about 1.30 (static 695 kN against dynamic 534 kN), typical of a spherical roller sized for heavy combined loads, and the 71 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Mounting on the 1:12 taper is controlled by clearance reduction or measured axial drive-up, never by locknut torque: SKF tables give the target radial-clearance decrease for the 120 mm 23124-cck-w33, checked with feeler gauges before and after drive-up.", "applications": [ "SAG and ball-mill drive shafts", "large mining crusher main shafts", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still" ], "pitfalls": [ "At 120 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23100-series series at 120 mm bore (200×62 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23124-cck-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "The 23124-cck-w33 and its cylindrical-bore counterpart 23124-cc-w33 share envelope and load ratings (534/695 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 534/695 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23124 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23124-cck-w33?", "a": "The SKF 23124 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 120 mm nominal bore, 200 mm outer diameter and 62 mm width (4.724 × 7.874 × 2.441 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 534 kN, C0 695 kN, Pu 71 kN, reference speed 2,600 r/min, limiting speed 3,400 r/min, mass about 10000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23124-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23124-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 120 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23124-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23124-cck-w33 and 23124-cc-w33?", "a": "They share the ISO 15 envelope and the same 534/695 kN ratings, but 23124-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23124-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23124", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23124; identical ISO 15 envelope, fits H3124 adapter sleeve on a 110 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23124-CCK-W33", "SKF 23124 CCK/W33", "23124 K" ], "locale_variants": {} }, { "sku": "22224-EK", "brand": "SKF", "manufacturer_designation": "SKF 22224 EK", "series": "22200-series", "type": "spherical_roller", "d_mm": 120, "D_mm": 215, "B_mm": 58, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 652, "static_load_kN": 765, "fatigue_load_limit_kN": 73.5, "max_rpm": 3800, "reference_speed_rpm": 2800, "limiting_speed_rpm": 3800, "weight_g": 11000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF 22224 EK in SKF catalogue PUB BU/P1 17000 is a double-row spherical roller bearing with a tapered bore (1:12), intended for an H-series adapter sleeve or AH withdrawal sleeve, with two pressed-steel cages with a floating guide ring and the same 120×215×58 mm ISO 15 outline as its cylindrical-bore counterpart. Digit by digit, 22224-ek reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 22, and bore reference 24 resolving to 120 mm; 215 mm OD and 58 mm width are the matching ISO 15 boundary values. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. Catalogue mass 11000 g for the 120×215×58 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. Because driving up the 1:12 taper consumes radial clearance, K executions are commonly ordered with C3 initial clearance so the residual running clearance after mounting matches the cylindrical-bore 22224 on an interference seat.", "applications": [ "large dredger and marine winch drums", "steel-plant continuous-caster segments", "split-housing plummer block arrangements with bearings swapped in situ", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "At 120 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 22200-series series at 120 mm bore (215×58 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 58 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 58 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 22224-ek pits long before its L10 life.", "The 652/765 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22224 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22224-ek?", "a": "The SKF 22224 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 120 mm nominal bore, 215 mm outer diameter and 58 mm width (4.724 × 8.465 × 2.283 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 652 kN, C0 765 kN, Pu 73.5 kN, reference speed 2,800 r/min, limiting speed 3,800 r/min, mass about 11000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 22224-ek?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 22224-ek?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 120 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 22224-ek driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 22224-ek and 22224?", "a": "They share the ISO 15 envelope and the same 652/765 kN ratings, but 22224-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22224 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "22224", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 22224; identical ISO 15 envelope, fits H3124 adapter sleeve on a 110 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22224-EK", "SKF 22224 EK", "22224 K" ], "locale_variants": {} }, { "sku": "23224-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23224 CCK/W33", "series": "23200-series", "type": "spherical_roller", "d_mm": 120, "D_mm": 215, "B_mm": 76, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 732, "static_load_kN": 930, "fatigue_load_limit_kN": 93, "max_rpm": 2800, "reference_speed_rpm": 2000, "limiting_speed_rpm": 2800, "weight_g": 14500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "23224-cck-w33 is the 1:12 tapered-bore execution of the 23200-series spherical roller bearing: the same two barrel-roller rows on a sphered outer raceway as 23224-cc-w33, but the inner-ring bore tapers 1 mm per 12 mm for adapter- or withdrawal-sleeve mounting, as listed by SKF in SKF catalogue PUB BU/P1 17000. Reading the designation: the leading 2 marks a spherical roller bearing, the 32 is the ISO 15 dimension series (dimension series 32 (medium OD, extra wide)), and the last two digits encode the 120 mm bore; the 215 mm OD and 76 mm width follow the ISO 15 general plan. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. At 2,000 r/min reference speed the 47.5 mm-section 23224-cck-w33 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 2,800 r/min as the mechanical ceiling. For shafts with a locating shoulder, use an AH withdrawal sleeve instead of an adapter sleeve: the bearing presses against the shoulder and the sleeve is drawn out for dismounting, making the 23224-cck-w33 removable without an induction heater.", "applications": [ "large induced-draft fan rotors", "SAG and ball-mill drive shafts", "split-housing plummer block arrangements with bearings swapped in situ", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "At 120 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23200-series series at 120 mm bore (215×76 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 76 mm width changes abutment spacing, even though the 215 mm OD matches.", "The 23224-cck-w33 and its cylindrical-bore counterpart 23224-cc-w33 share envelope and load ratings (732/930 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "The adapter sleeve is selected by actual shaft diameter, not by the 120 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23224-cck-w33 with different sleeves.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23224-cck-w33 pits long before its L10 life.", "The 732/930 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23224 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23224-cck-w33?", "a": "The SKF 23224 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 120 mm nominal bore, 215 mm outer diameter and 76 mm width (4.724 × 8.465 × 2.992 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 732 kN, C0 930 kN, Pu 93 kN, reference speed 2,000 r/min, limiting speed 2,800 r/min, mass about 14500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23224-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23224-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 120 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23224-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23224-cck-w33 and 23224-cc-w33?", "a": "They share the ISO 15 envelope and the same 732/930 kN ratings, but 23224-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23224-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23224", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23224; identical ISO 15 envelope, fits H2324 adapter sleeve on a 110 mm shaft." }, { "equiv_sku": "C3224", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3224 shares the 120×215×76 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C3224-K", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3224 K shares the 120×215×76 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23224-CCK-W33", "SKF 23224 CCK/W33", "23224 K" ], "locale_variants": {} }, { "sku": "22324-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 22324 CCK/W33", "series": "22300-series", "type": "spherical_roller", "d_mm": 120, "D_mm": 260, "B_mm": 86, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1019, "static_load_kN": 1120, "fatigue_load_limit_kN": 100, "max_rpm": 2600, "reference_speed_rpm": 2000, "limiting_speed_rpm": 2600, "weight_g": 25500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The SKF 22324 CCK/W33 is a 120×260×86 mm spherical roller bearing with a 1:12 tapered bore — SKF catalogue execution for sleeve mounting on a 120 mm plain shaft, retaining the double-row self-aligning barrel-roller design. The code breaks down as type digit 2 (double-row spherical roller), dimension series 23 (dimension series 23 (heavy OD, wide)), and bore code 24 = 120 mm; dimensions 120×260×86 mm therefore match the ISO 15 envelope. The K in the designation marks the 1:12 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. Catalogue mass 25500 g for the 120×260×86 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. For shafts with a locating shoulder, use an AH withdrawal sleeve instead of an adapter sleeve: the bearing presses against the shoulder and the sleeve is drawn out for dismounting, making the 22324-cck-w33 removable without an induction heater.", "applications": [ "large dredger and marine winch drums", "steel-plant continuous-caster segments", "fan and pulley shafts that need periodic bearing removal in the field", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 120 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 22300-series series at 120 mm bore (260×86 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 2,600 r/min ceiling.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 22324-cck-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 86 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 22324-cck-w33 pits long before its L10 life.", "The 1019/1120 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22324 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22324-cck-w33?", "a": "The SKF 22324 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 120 mm nominal bore, 260 mm outer diameter and 86 mm width (4.724 × 10.236 × 3.386 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1019 kN, C0 1120 kN, Pu 100 kN, reference speed 2,000 r/min, limiting speed 2,600 r/min, mass about 25500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 22324-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 22324-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 120 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 22324-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 22324-cck-w33 and 22324-cc-w33?", "a": "They share the ISO 15 envelope and the same 1019/1120 kN ratings, but 22324-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22324-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "22324", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 22324; identical ISO 15 envelope, fits H2324 adapter sleeve on a 110 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22324-CCK-W33", "SKF 22324 CCK/W33", "22324 K" ], "locale_variants": {} }, { "sku": "23026-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23026 CCK/W33", "series": "23000-series", "type": "spherical_roller", "d_mm": 130, "D_mm": 200, "B_mm": 52, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 452, "static_load_kN": 610, "fatigue_load_limit_kN": 61, "max_rpm": 3600, "reference_speed_rpm": 2800, "limiting_speed_rpm": 3600, "weight_g": 8600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF 23026 CCK/W33 in SKF catalogue PUB BU/P1 17000 is a double-row spherical roller bearing with a tapered bore (1:12), intended for an H-series adapter sleeve or AH withdrawal sleeve, with two pressed-steel cages with a floating guide ring and the same 130×200×52 mm ISO 15 outline as its cylindrical-bore counterpart. Reading the designation: the leading 2 marks a spherical roller bearing, the 30 is the ISO 15 dimension series (dimension series 30 (slim OD, extra-wide)), and the last two digits encode the 130 mm bore; the 200 mm OD and 52 mm width follow the ISO 15 general plan. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. The 61 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.35 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. For shafts with a locating shoulder, use an AH withdrawal sleeve instead of an adapter sleeve: the bearing presses against the shoulder and the sleeve is drawn out for dismounting, making the 23026-cck-w33 removable without an induction heater.", "applications": [ "steel-plant continuous-caster segments", "large induced-draft fan rotors", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "At 130 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23000-series series at 130 mm bore (200×52 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "The 23026-cck-w33 and its cylindrical-bore counterpart 23026-cc-w33 share envelope and load ratings (452/610 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23026-cck-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "The 23026-cck-w33 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 452/610 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The 452/610 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23026 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23026-cck-w33?", "a": "The SKF 23026 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 130 mm nominal bore, 200 mm outer diameter and 52 mm width (5.118 × 7.874 × 2.047 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 452 kN, C0 610 kN, Pu 61 kN, reference speed 2,800 r/min, limiting speed 3,600 r/min, mass about 8600 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23026-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23026-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 130 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23026-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23026-cck-w33 and 23026-cc-w33?", "a": "They share the ISO 15 envelope and the same 452/610 kN ratings, but 23026-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23026-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23026", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23026; identical ISO 15 envelope, fits H3026 adapter sleeve on a 110 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23026-CCK-W33", "SKF 23026 CCK/W33", "23026 K" ], "locale_variants": {} }, { "sku": "23126-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23126 CCK/W33", "series": "23100-series", "type": "spherical_roller", "d_mm": 130, "D_mm": 210, "B_mm": 64, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 586, "static_load_kN": 780, "fatigue_load_limit_kN": 78, "max_rpm": 3200, "reference_speed_rpm": 2400, "limiting_speed_rpm": 3200, "weight_g": 12000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "23126-cck-w33 is the 1:12 tapered-bore execution of the 23100-series spherical roller bearing: the same two barrel-roller rows on a sphered outer raceway as 23126-cc-w33, but the inner-ring bore tapers 1 mm per 12 mm for adapter- or withdrawal-sleeve mounting, as listed by SKF in SKF catalogue PUB BU/P1 17000. Digit by digit, 23126-cck-w33 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 31, and bore reference 26 resolving to 130 mm; 210 mm OD and 64 mm width are the matching ISO 15 boundary values. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. With C 586 kN and C0 780 kN, the 23126-cck-w33 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. On an H adapter sleeve the 130 mm shaft seat only needs an h9 plain journal; slide the sleeve into the 23126-cck-w33 inner ring, tighten the KM nut against the MB washer until the catalogue clearance-reduction value is reached, then lock the washer tab.", "applications": [ "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "split-housing plummer block arrangements with bearings swapped in situ", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "At 130 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23100-series series at 130 mm bore (210×64 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 64 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "The adapter sleeve is selected by actual shaft diameter, not by the 130 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23126-cck-w33 with different sleeves.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 586/780 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23126 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23126-cck-w33?", "a": "The SKF 23126 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 130 mm nominal bore, 210 mm outer diameter and 64 mm width (5.118 × 8.268 × 2.52 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 586 kN, C0 780 kN, Pu 78 kN, reference speed 2,400 r/min, limiting speed 3,200 r/min, mass about 12000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23126-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23126-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 130 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23126-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23126-cck-w33 and 23126-cc-w33?", "a": "They share the ISO 15 envelope and the same 586/780 kN ratings, but 23126-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23126-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23126", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23126; identical ISO 15 envelope, fits H3126 adapter sleeve on a 110 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23126-CCK-W33", "SKF 23126 CCK/W33", "23126 K" ], "locale_variants": {} }, { "sku": "22226-EK", "brand": "SKF", "manufacturer_designation": "SKF 22226 EK", "series": "22200-series", "type": "spherical_roller", "d_mm": 130, "D_mm": 230, "B_mm": 64, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel", "dynamic_load_kN": 758, "static_load_kN": 930, "fatigue_load_limit_kN": 88, "max_rpm": 3600, "reference_speed_rpm": 2600, "limiting_speed_rpm": 3600, "weight_g": 14000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The SKF 22226 EK is a 130×230×64 mm spherical roller bearing with a 1:12 tapered bore — SKF catalogue execution for sleeve mounting on a 130 mm plain shaft, retaining the double-row self-aligning barrel-roller design. Numbering ties the bearing to its envelope: 22226-ek means spherical-roller type, dimension series 22, 130 mm bore — which is why the 230×64 mm outline swaps dimensionally with other ISO 15 bearings of the same code. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. With C 758 kN and C0 930 kN, the 22226-ek load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. After drive-up, re-check radial clearance and then swing the outer ring through its self-aligning range: the sphered raceway of the 22226-ek must still tilt ≈ 0.5–2.5° freely — a joint that binds after sleeve mounting signals excessive drive-up or a cocked sleeve.", "applications": [ "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "At 130 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 22200-series series at 130 mm bore (230×64 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 22226-ek to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "The 22226-ek and its cylindrical-bore counterpart 22226 share envelope and load ratings (758/930 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 22226-ek pits long before its L10 life.", "The 758/930 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22226 EK); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22226-ek?", "a": "The SKF 22226 EK is a double-row spherical roller bearing with a 1:12 tapered bore, 130 mm nominal bore, 230 mm outer diameter and 64 mm width (5.118 × 9.055 × 2.52 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 758 kN, C0 930 kN, Pu 88 kN, reference speed 2,600 r/min, limiting speed 3,600 r/min, mass about 14000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 22226-ek?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 22226-ek?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 130 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 22226-ek driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 22226-ek and 22226?", "a": "They share the ISO 15 envelope and the same 758/930 kN ratings, but 22226-ek has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22226 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "22226", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 22226; identical ISO 15 envelope, fits H3126 adapter sleeve on a 110 mm shaft." }, { "equiv_sku": "C2226", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2226 shares the 130×230×64 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C2226-K", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 2226 K shares the 130×230×64 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22226-EK", "SKF 22226 EK", "22226 K" ], "locale_variants": {} }, { "sku": "23226-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23226 CCK/W33", "series": "23200-series", "type": "spherical_roller", "d_mm": 130, "D_mm": 230, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 826, "static_load_kN": 1060, "fatigue_load_limit_kN": 104, "max_rpm": 2600, "reference_speed_rpm": 1900, "limiting_speed_rpm": 2600, "weight_g": 18500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The SKF 23226 CCK/W33 is a 130×230×80 mm spherical roller bearing with a 1:12 tapered bore — SKF catalogue execution for sleeve mounting on a 130 mm plain shaft, retaining the double-row self-aligning barrel-roller design. Numbering ties the bearing to its envelope: 23226-cck-w33 means spherical-roller type, dimension series 32, 130 mm bore — which is why the 230×80 mm outline swaps dimensionally with other ISO 15 bearings of the same code. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. The 50.0 mm radial section height ((230−130)/2) and 18500 g catalogue mass frame a 130 mm bore bearing rated at 826 kN C — roughly 6.35 kN of dynamic capacity per millimetre of bore before application factors. Mounting on the 1:12 taper is controlled by clearance reduction or measured axial drive-up, never by locknut torque: SKF tables give the target radial-clearance decrease for the 130 mm 23226-cck-w33, checked with feeler gauges before and after drive-up.", "applications": [ "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat", "split-housing plummer block arrangements with bearings swapped in situ" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals" ], "pitfalls": [ "At 130 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23200-series series at 130 mm bore (230×80 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 80 mm width changes abutment spacing, even though the 230 mm OD matches.", "The adapter sleeve is selected by actual shaft diameter, not by the 130 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23226-cck-w33 with different sleeves.", "The 23226-cck-w33 and its cylindrical-bore counterpart 23226-cc-w33 share envelope and load ratings (826/1060 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23226-cck-w33 pits long before its L10 life.", "The 826/1060 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23226 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23226-cck-w33?", "a": "The SKF 23226 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 130 mm nominal bore, 230 mm outer diameter and 80 mm width (5.118 × 9.055 × 3.15 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 826 kN, C0 1060 kN, Pu 104 kN, reference speed 1,900 r/min, limiting speed 2,600 r/min, mass about 18500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23226-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23226-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 130 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23226-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23226-cck-w33 and 23226-cc-w33?", "a": "They share the ISO 15 envelope and the same 826/1060 kN ratings, but 23226-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23226-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23226", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23226; identical ISO 15 envelope, fits H2326 adapter sleeve on a 110 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23226-CCK-W33", "SKF 23226 CCK/W33", "23226 K" ], "locale_variants": {} }, { "sku": "22326-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 22326 CCK/W33", "series": "22300-series", "type": "spherical_roller", "d_mm": 130, "D_mm": 280, "B_mm": 93, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1176, "static_load_kN": 1320, "fatigue_load_limit_kN": 114, "max_rpm": 2400, "reference_speed_rpm": 1800, "limiting_speed_rpm": 2400, "weight_g": 33000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 22326-cck-w33 denotes the tapered-bore version (K suffix, taper 1:12) of the 22300-series spherical roller bearing: dimensioned 130×280×93 mm, it seats on an adapter or withdrawal sleeve rather than directly on a machined journal. Digit by digit, 22326-cck-w33 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 23, and bore reference 26 resolving to 130 mm; 280 mm OD and 93 mm width are the matching ISO 15 boundary values. Reading the suffix on 22326-cck-w33, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 22326-cc-w33. Selection arithmetic: the C0/C ratio is about 1.12 (static 1320 kN against dynamic 1176 kN), typical of a spherical roller sized for heavy combined loads, and the 114 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Mounting on the 1:12 taper is controlled by clearance reduction or measured axial drive-up, never by locknut torque: SKF tables give the target radial-clearance decrease for the 130 mm 22326-cck-w33, checked with feeler gauges before and after drive-up.", "applications": [ "SAG and ball-mill drive shafts", "large mining crusher main shafts", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder", "fan and pulley shafts that need periodic bearing removal in the field" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "At 130 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 22300-series series at 130 mm bore (280×93 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 2,400 r/min ceiling.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 93 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 22326-cck-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 22326-cck-w33 pits long before its L10 life.", "The 1176/1320 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22326 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22326-cck-w33?", "a": "The SKF 22326 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 130 mm nominal bore, 280 mm outer diameter and 93 mm width (5.118 × 11.024 × 3.661 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1176 kN, C0 1320 kN, Pu 114 kN, reference speed 1,800 r/min, limiting speed 2,400 r/min, mass about 33000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 22326-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 22326-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 130 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 22326-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 22326-cck-w33 and 22326-cc-w33?", "a": "They share the ISO 15 envelope and the same 1176/1320 kN ratings, but 22326-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22326-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "22326", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 22326; identical ISO 15 envelope, fits H2326 adapter sleeve on a 110 mm shaft." }, { "equiv_sku": "C2326-K-VE240", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2326 K/VE240 shares the 130×280×93 mm envelope but catalogue C/C0 differ (980/1220 kN vs 1176/1320 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22326-CCK-W33", "SKF 22326 CCK/W33", "22326 K" ], "locale_variants": {} }, { "sku": "23028-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23028 CCK/W33", "series": "23000-series", "type": "spherical_roller", "d_mm": 140, "D_mm": 210, "B_mm": 53, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 485, "static_load_kN": 680, "fatigue_load_limit_kN": 68, "max_rpm": 3400, "reference_speed_rpm": 2600, "limiting_speed_rpm": 3400, "weight_g": 9400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "23028-cck-w33 is the 1:12 tapered-bore execution of the 23000-series spherical roller bearing: the same two barrel-roller rows on a sphered outer raceway as 23028-cc-w33, but the inner-ring bore tapers 1 mm per 12 mm for adapter- or withdrawal-sleeve mounting, as listed by SKF in SKF catalogue PUB BU/P1 17000. Numbering ties the bearing to its envelope: 23028-cck-w33 means spherical-roller type, dimension series 30, 140 mm bore — which is why the 210×53 mm outline swaps dimensionally with other ISO 15 bearings of the same code. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. Speed planning uses two different ceilings: 2,600 r/min thermal reference and 3,400 r/min mechanical limiting speed. Mounting on the 1:12 taper is controlled by clearance reduction or measured axial drive-up, never by locknut torque: SKF tables give the target radial-clearance decrease for the 140 mm 23028-cck-w33, checked with feeler gauges before and after drive-up.", "applications": [ "large mining crusher main shafts", "wind-turbine main shaft support", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals" ], "pitfalls": [ "At 140 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23000-series series at 140 mm bore (210×53 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "The adapter sleeve is selected by actual shaft diameter, not by the 140 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23028-cck-w33 with different sleeves.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 53 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "The 23028-cck-w33 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 485/680 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The 485/680 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23028 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23028-cck-w33?", "a": "The SKF 23028 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 140 mm nominal bore, 210 mm outer diameter and 53 mm width (5.512 × 8.268 × 2.087 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 485 kN, C0 680 kN, Pu 68 kN, reference speed 2,600 r/min, limiting speed 3,400 r/min, mass about 9400 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23028-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23028-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 140 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23028-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23028-cck-w33 and 23028-cc-w33?", "a": "They share the ISO 15 envelope and the same 485/680 kN ratings, but 23028-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23028-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23028", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23028; identical ISO 15 envelope, fits H3028 adapter sleeve on a 110 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23028-CCK-W33", "SKF 23028 CCK/W33", "23028 K" ], "locale_variants": {} }, { "sku": "23128-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23128 CCK/W33", "series": "23100-series", "type": "spherical_roller", "d_mm": 140, "D_mm": 225, "B_mm": 68, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 659, "static_load_kN": 900, "fatigue_load_limit_kN": 88, "max_rpm": 2800, "reference_speed_rpm": 2200, "limiting_speed_rpm": 2800, "weight_g": 14500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The SKF 23128 CCK/W33 is a 140×225×68 mm spherical roller bearing with a 1:12 tapered bore — SKF catalogue execution for sleeve mounting on a 140 mm plain shaft, retaining the double-row self-aligning barrel-roller design. On the SKF nameplate, 23128-cck-w33 follows the ISO 15 convention: 2 for the spherical roller type, 31 for the dimension series 31 (medium OD, wide), final digits 28 for the 140 mm bore. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. At 2,200 r/min reference speed the 42.5 mm-section 23128-cck-w33 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 2,800 r/min as the mechanical ceiling. After drive-up, re-check radial clearance and then swing the outer ring through its self-aligning range: the sphered raceway of the 23128-cck-w33 must still tilt ≈ 0.5–2.5° freely — a joint that binds after sleeve mounting signals excessive drive-up or a cocked sleeve.", "applications": [ "large induced-draft fan rotors", "SAG and ball-mill drive shafts", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat", "split-housing plummer block arrangements with bearings swapped in situ" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals" ], "pitfalls": [ "At 140 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23100-series series at 140 mm bore (225×68 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23128-cck-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "The 23128-cck-w33 and its cylindrical-bore counterpart 23128-cc-w33 share envelope and load ratings (659/900 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 659/900 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23128 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23128-cck-w33?", "a": "The SKF 23128 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 140 mm nominal bore, 225 mm outer diameter and 68 mm width (5.512 × 8.858 × 2.677 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 659 kN, C0 900 kN, Pu 88 kN, reference speed 2,200 r/min, limiting speed 2,800 r/min, mass about 14500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23128-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23128-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 140 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23128-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23128-cck-w33 and 23128-cc-w33?", "a": "They share the ISO 15 envelope and the same 659/900 kN ratings, but 23128-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23128-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23128", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23128; identical ISO 15 envelope, fits H3128 adapter sleeve on a 110 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23128-CCK-W33", "SKF 23128 CCK/W33", "23128 K" ], "locale_variants": {} }, { "sku": "22228-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 22228 CCK/W33", "series": "22200-series", "type": "spherical_roller", "d_mm": 140, "D_mm": 250, "B_mm": 68, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 743, "static_load_kN": 900, "fatigue_load_limit_kN": 86.5, "max_rpm": 3200, "reference_speed_rpm": 2400, "limiting_speed_rpm": 3200, "weight_g": 18000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The SKF 22228 CCK/W33 is a 140×250×68 mm spherical roller bearing with a 1:12 tapered bore — SKF catalogue execution for sleeve mounting on a 140 mm plain shaft, retaining the double-row self-aligning barrel-roller design. Numbering ties the bearing to its envelope: 22228-cck-w33 means spherical-roller type, dimension series 22, 140 mm bore — which is why the 250×68 mm outline swaps dimensionally with other ISO 15 bearings of the same code. The K in the designation marks the 1:12 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. Catalogue mass 18000 g for the 140×250×68 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. Over-driving the 22228-cck-w33 up its sleeve pinches radial clearance below the residual minimum and can crack the inner ring in service; under-driving leaves the sleeve seat loose, so the ring creeps and frets the sleeve — measure, do not estimate.", "applications": [ "large dredger and marine winch drums", "steel-plant continuous-caster segments", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems" ], "pitfalls": [ "At 140 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 22200-series series at 140 mm bore (250×68 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.", "The adapter sleeve is selected by actual shaft diameter, not by the 140 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 22228-cck-w33 with different sleeves.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 22228-cck-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 743/900 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22228 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22228-cck-w33?", "a": "The SKF 22228 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 140 mm nominal bore, 250 mm outer diameter and 68 mm width (5.512 × 9.843 × 2.677 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 743 kN, C0 900 kN, Pu 86.5 kN, reference speed 2,400 r/min, limiting speed 3,200 r/min, mass about 18000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 22228-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 22228-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 140 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 22228-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 22228-cck-w33 and 22228-cc-w33?", "a": "They share the ISO 15 envelope and the same 743/900 kN ratings, but 22228-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22228-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "22228", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 22228; identical ISO 15 envelope, fits H3128 adapter sleeve on a 110 mm shaft." }, { "equiv_sku": "C2228", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2228 shares the 140×250×68 mm envelope but catalogue C/C0 differ (830/1060 kN vs 743/900 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C2228-K", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2228 K shares the 140×250×68 mm envelope but catalogue C/C0 differ (830/1060 kN vs 743/900 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22228-CCK-W33", "SKF 22228 CCK/W33", "22228 K" ], "locale_variants": {} }, { "sku": "23228-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23228 CCK/W33", "series": "23200-series", "type": "spherical_roller", "d_mm": 140, "D_mm": 250, "B_mm": 88, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 962, "static_load_kN": 1250, "fatigue_load_limit_kN": 120, "max_rpm": 2400, "reference_speed_rpm": 1700, "limiting_speed_rpm": 2400, "weight_g": 24000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The SKF 23228 CCK/W33 is a 140×250×88 mm spherical roller bearing with a 1:12 tapered bore — SKF catalogue execution for sleeve mounting on a 140 mm plain shaft, retaining the double-row self-aligning barrel-roller design. The code breaks down as type digit 2 (double-row spherical roller), dimension series 32 (dimension series 32 (medium OD, extra wide)), and bore code 28 = 140 mm; dimensions 140×250×88 mm therefore match the ISO 15 envelope. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. The 120 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.30 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. On an H adapter sleeve the 140 mm shaft seat only needs an h9 plain journal; slide the sleeve into the 23228-cck-w33 inner ring, tighten the KM nut against the MB washer until the catalogue clearance-reduction value is reached, then lock the washer tab.", "applications": [ "steel-plant continuous-caster segments", "large induced-draft fan rotors", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder", "fan and pulley shafts that need periodic bearing removal in the field" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "At 140 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23200-series series at 140 mm bore (250×88 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 88 mm width changes abutment spacing, even though the 250 mm OD matches.", "The 23228-cck-w33 and its cylindrical-bore counterpart 23228-cc-w33 share envelope and load ratings (962/1250 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "The adapter sleeve is selected by actual shaft diameter, not by the 140 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23228-cck-w33 with different sleeves.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23228-cck-w33 pits long before its L10 life.", "The 962/1250 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23228 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23228-cck-w33?", "a": "The SKF 23228 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 140 mm nominal bore, 250 mm outer diameter and 88 mm width (5.512 × 9.843 × 3.465 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 962 kN, C0 1250 kN, Pu 120 kN, reference speed 1,700 r/min, limiting speed 2,400 r/min, mass about 24000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23228-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23228-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 140 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23228-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23228-cck-w33 and 23228-cc-w33?", "a": "They share the ISO 15 envelope and the same 962/1250 kN ratings, but 23228-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23228-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23228", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23228; identical ISO 15 envelope, fits H2328 adapter sleeve on a 110 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23228-CCK-W33", "SKF 23228 CCK/W33", "23228 K" ], "locale_variants": {} }, { "sku": "22328-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 22328 CCK/W33", "series": "22300-series", "type": "spherical_roller", "d_mm": 140, "D_mm": 300, "B_mm": 102, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1357, "static_load_kN": 1560, "fatigue_load_limit_kN": 132, "max_rpm": 2200, "reference_speed_rpm": 1700, "limiting_speed_rpm": 2200, "weight_g": 41000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 22328-cck-w33 denotes the tapered-bore version (K suffix, taper 1:12) of the 22300-series spherical roller bearing: dimensioned 140×300×102 mm, it seats on an adapter or withdrawal sleeve rather than directly on a machined journal. On the SKF nameplate, 22328-cck-w33 follows the ISO 15 convention: 2 for the spherical roller type, 23 for the dimension series 23 (heavy OD, wide), final digits 28 for the 140 mm bore. Reading the suffix on 22328-cck-w33, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 22328-cc-w33. With C 1357 kN and C0 1560 kN, the 22328-cck-w33 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. On an H adapter sleeve the 140 mm shaft seat only needs an h9 plain journal; slide the sleeve into the 22328-cck-w33 inner ring, tighten the KM nut against the MB washer until the catalogue clearance-reduction value is reached, then lock the washer tab.", "applications": [ "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "smearing on the roller-raceway contact during skid starts below the minimum load" ], "pitfalls": [ "At 140 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 22300-series series at 140 mm bore (300×102 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 2,200 r/min ceiling.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 22328-cck-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 102 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 22328-cck-w33 pits long before its L10 life.", "The 1357/1560 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22328 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22328-cck-w33?", "a": "The SKF 22328 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 140 mm nominal bore, 300 mm outer diameter and 102 mm width (5.512 × 11.811 × 4.016 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1357 kN, C0 1560 kN, Pu 132 kN, reference speed 1,700 r/min, limiting speed 2,200 r/min, mass about 41000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 22328-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 22328-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 140 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 22328-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 22328-cck-w33 and 22328-cc-w33?", "a": "They share the ISO 15 envelope and the same 1357/1560 kN ratings, but 22328-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22328-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "22328", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 22328; identical ISO 15 envelope, fits H2328 adapter sleeve on a 110 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22328-CCK-W33", "SKF 22328 CCK/W33", "22328 K" ], "locale_variants": {} }, { "sku": "23030-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23030 CCK/W33", "series": "23000-series", "type": "spherical_roller", "d_mm": 150, "D_mm": 225, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 531, "static_load_kN": 750, "fatigue_load_limit_kN": 73.5, "max_rpm": 3200, "reference_speed_rpm": 2400, "limiting_speed_rpm": 3200, "weight_g": 11000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 23030-cck-w33 denotes the tapered-bore version (K suffix, taper 1:12) of the 23000-series spherical roller bearing: dimensioned 150×225×56 mm, it seats on an adapter or withdrawal sleeve rather than directly on a machined journal. On the SKF nameplate, 23030-cck-w33 follows the ISO 15 convention: 2 for the spherical roller type, 30 for the dimension series 30 (slim OD, extra-wide), final digits 30 for the 150 mm bore. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. Selection arithmetic: the C0/C ratio is about 1.41 (static 750 kN against dynamic 531 kN), typical of a spherical roller sized for heavy combined loads, and the 73.5 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Over-driving the 23030-cck-w33 up its sleeve pinches radial clearance below the residual minimum and can crack the inner ring in service; under-driving leaves the sleeve seat loose, so the ring creeps and frets the sleeve — measure, do not estimate.", "applications": [ "SAG and ball-mill drive shafts", "large mining crusher main shafts", "fan and pulley shafts that need periodic bearing removal in the field", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "At 150 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23000-series series at 150 mm bore (225×56 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "The adapter sleeve is selected by actual shaft diameter, not by the 150 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23030-cck-w33 with different sleeves.", "The adapter sleeve is selected by actual shaft diameter, not by the 150 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23030-cck-w33 with different sleeves.", "The 23030-cck-w33 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 531/750 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The 531/750 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23030 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23030-cck-w33?", "a": "The SKF 23030 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 150 mm nominal bore, 225 mm outer diameter and 56 mm width (5.906 × 8.858 × 2.205 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 531 kN, C0 750 kN, Pu 73.5 kN, reference speed 2,400 r/min, limiting speed 3,200 r/min, mass about 11000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23030-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23030-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 150 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23030-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23030-cck-w33 and 23030-cc-w33?", "a": "They share the ISO 15 envelope and the same 531/750 kN ratings, but 23030-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23030-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23030", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23030; identical ISO 15 envelope, fits H3030 adapter sleeve on a 110 mm shaft." }, { "equiv_sku": "C3030-MB", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 3030 MB shares the 150×225×56 mm envelope but catalogue C/C0 differ (540/850 kN vs 531/750 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C3030-V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 3030 V shares the 150×225×56 mm envelope but catalogue C/C0 differ (585/960 kN vs 531/750 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C3030-KV", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 3030 KV shares the 150×225×56 mm envelope but catalogue C/C0 differ (585/960 kN vs 531/750 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23030-CCK-W33", "SKF 23030 CCK/W33", "23030 K" ], "locale_variants": {} }, { "sku": "23130-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23130 CCK/W33", "series": "23100-series", "type": "spherical_roller", "d_mm": 150, "D_mm": 250, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 883, "static_load_kN": 1200, "fatigue_load_limit_kN": 114, "max_rpm": 2600, "reference_speed_rpm": 2000, "limiting_speed_rpm": 2600, "weight_g": 21000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF lists SKF 23130 CCK/W33 as the adapter-sleeve execution in the 23100-series range: a 150 mm nominal-bore spherical roller bearing whose 1:12 tapered inner ring is driven up a sleeve, with 250 mm OD and 80 mm width to the ISO 15 envelope. The code breaks down as type digit 2 (double-row spherical roller), dimension series 31 (dimension series 31 (medium OD, wide)), and bore code 30 = 150 mm; dimensions 150×250×80 mm therefore match the ISO 15 envelope. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. At 2,000 r/min reference speed the 50.0 mm-section 23130-cck-w33 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 2,600 r/min as the mechanical ceiling. On an H adapter sleeve the 150 mm shaft seat only needs an h9 plain journal; slide the sleeve into the 23130-cck-w33 inner ring, tighten the KM nut against the MB washer until the catalogue clearance-reduction value is reached, then lock the washer tab.", "applications": [ "large induced-draft fan rotors", "SAG and ball-mill drive shafts", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder", "fan and pulley shafts that need periodic bearing removal in the field" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals" ], "pitfalls": [ "At 150 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23100-series series at 150 mm bore (250×80 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23130-cck-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "The 23130-cck-w33 and its cylindrical-bore counterpart 23130-cc-w33 share envelope and load ratings (883/1200 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "The 21000 g mass and 80 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23130-cck-w33.", "The 883/1200 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23130 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23130-cck-w33?", "a": "The SKF 23130 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 150 mm nominal bore, 250 mm outer diameter and 80 mm width (5.906 × 9.843 × 3.15 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 883 kN, C0 1200 kN, Pu 114 kN, reference speed 2,000 r/min, limiting speed 2,600 r/min, mass about 21000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23130-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23130-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 150 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23130-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23130-cck-w33 and 23130-cc-w33?", "a": "They share the ISO 15 envelope and the same 883/1200 kN ratings, but 23130-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23130-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23130", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23130; identical ISO 15 envelope, fits H3130 adapter sleeve on a 110 mm shaft." }, { "equiv_sku": "C3130", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3130 shares the 150×250×80 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C3130-K", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3130 K shares the 150×250×80 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23130-CCK-W33", "SKF 23130 CCK/W33", "23130 K" ], "locale_variants": {} }, { "sku": "22230-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 22230 CCK/W33", "series": "22200-series", "type": "spherical_roller", "d_mm": 150, "D_mm": 270, "B_mm": 73, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 898, "static_load_kN": 1080, "fatigue_load_limit_kN": 102, "max_rpm": 3000, "reference_speed_rpm": 2200, "limiting_speed_rpm": 3000, "weight_g": 23000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For sleeve mounting on a 150 mm shaft, SKF order number SKF 22230 CCK/W33 is the 1:12 tapered-bore spherical roller bearing in the 22200-series family (dimension series 22 (medium OD, wide)); the cylindrical-bore equivalent is a separate order number, 22230-cc-w33. On the SKF nameplate, 22230-cck-w33 follows the ISO 15 convention: 2 for the spherical roller type, 22 for the dimension series 22 (medium OD, wide), final digits 30 for the 150 mm bore. Reading the suffix on 22230-cck-w33, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 22230-cc-w33. Catalogue mass 23000 g for the 150×270×73 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. On an H adapter sleeve the 150 mm shaft seat only needs an h9 plain journal; slide the sleeve into the 22230-cck-w33 inner ring, tighten the KM nut against the MB washer until the catalogue clearance-reduction value is reached, then lock the washer tab.", "applications": [ "large dredger and marine winch drums", "steel-plant continuous-caster segments", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "At 150 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 22200-series series at 150 mm bore (270×73 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.", "The adapter sleeve is selected by actual shaft diameter, not by the 150 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 22230-cck-w33 with different sleeves.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 22230-cck-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "The 23000 g mass and 73 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 22230-cck-w33.", "The 898/1080 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22230 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22230-cck-w33?", "a": "The SKF 22230 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 150 mm nominal bore, 270 mm outer diameter and 73 mm width (5.906 × 10.63 × 2.874 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 898 kN, C0 1080 kN, Pu 102 kN, reference speed 2,200 r/min, limiting speed 3,000 r/min, mass about 23000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 22230-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 22230-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 150 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 22230-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 22230-cck-w33 and 22230-cc-w33?", "a": "They share the ISO 15 envelope and the same 898/1080 kN ratings, but 22230-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22230-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "22230", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 22230; identical ISO 15 envelope, fits H3130 adapter sleeve on a 110 mm shaft." }, { "equiv_sku": "C2230", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2230 shares the 150×270×73 mm envelope but catalogue C/C0 differ (980/1220 kN vs 898/1080 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C2230-K", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 2230 K shares the 150×270×73 mm envelope but catalogue C/C0 differ (980/1220 kN vs 898/1080 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22230-CCK-W33", "SKF 22230 CCK/W33", "22230 K" ], "locale_variants": {} }, { "sku": "23230-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23230 CCK/W33", "series": "23200-series", "type": "spherical_roller", "d_mm": 150, "D_mm": 270, "B_mm": 96, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1129, "static_load_kN": 1460, "fatigue_load_limit_kN": 137, "max_rpm": 2200, "reference_speed_rpm": 1600, "limiting_speed_rpm": 2200, "weight_g": 30000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For sleeve mounting on a 150 mm shaft, SKF order number SKF 23230 CCK/W33 is the 1:12 tapered-bore spherical roller bearing in the 23200-series family (dimension series 32 (medium OD, extra wide)); the cylindrical-bore equivalent is a separate order number, 23230-cc-w33. Reading the designation: the leading 2 marks a spherical roller bearing, the 32 is the ISO 15 dimension series (dimension series 32 (medium OD, extra wide)), and the last two digits encode the 150 mm bore; the 270 mm OD and 96 mm width follow the ISO 15 general plan. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. Catalogue mass 30000 g for the 150×270×96 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. Because driving up the 1:12 taper consumes radial clearance, K executions are commonly ordered with C3 initial clearance so the residual running clearance after mounting matches the cylindrical-bore 23230-cc-w33 on an interference seat.", "applications": [ "large dredger and marine winch drums", "steel-plant continuous-caster segments", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals" ], "pitfalls": [ "At 150 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23200-series series at 150 mm bore (270×96 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 96 mm width changes abutment spacing, even though the 270 mm OD matches.", "The 23230-cck-w33 and its cylindrical-bore counterpart 23230-cc-w33 share envelope and load ratings (1129/1460 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23230-cck-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23230-cck-w33 pits long before its L10 life.", "The 1129/1460 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23230 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23230-cck-w33?", "a": "The SKF 23230 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 150 mm nominal bore, 270 mm outer diameter and 96 mm width (5.906 × 10.63 × 3.78 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1129 kN, C0 1460 kN, Pu 137 kN, reference speed 1,600 r/min, limiting speed 2,200 r/min, mass about 30000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23230-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23230-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 150 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23230-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23230-cck-w33 and 23230-cc-w33?", "a": "They share the ISO 15 envelope and the same 1129/1460 kN ratings, but 23230-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23230-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23230", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23230; identical ISO 15 envelope, fits H2330 adapter sleeve on a 110 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23230-CCK-W33", "SKF 23230 CCK/W33", "23230 K" ], "locale_variants": {} }, { "sku": "22330-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 22330 CCK/W33", "series": "22300-series", "type": "spherical_roller", "d_mm": 150, "D_mm": 320, "B_mm": 108, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1539, "static_load_kN": 1760, "fatigue_load_limit_kN": 146, "max_rpm": 2000, "reference_speed_rpm": 1600, "limiting_speed_rpm": 2000, "weight_g": 47500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF 22330 CCK/W33 in SKF catalogue PUB BU/P1 17000 is a double-row spherical roller bearing with a tapered bore (1:12), intended for an H-series adapter sleeve or AH withdrawal sleeve, with two pressed-steel cages with a floating guide ring and the same 150×320×108 mm ISO 15 outline as its cylindrical-bore counterpart. Numbering ties the bearing to its envelope: 22330-cck-w33 means spherical-roller type, dimension series 23, 150 mm bore — which is why the 320×108 mm outline swaps dimensionally with other ISO 15 bearings of the same code. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. The 85.0 mm radial section height ((320−150)/2) and 47500 g catalogue mass frame a 150 mm bore bearing rated at 1539 kN C — roughly 10.26 kN of dynamic capacity per millimetre of bore before application factors. Mounting on the 1:12 taper is controlled by clearance reduction or measured axial drive-up, never by locknut torque: SKF tables give the target radial-clearance decrease for the 150 mm 22330-cck-w33, checked with feeler gauges before and after drive-up.", "applications": [ "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "split-housing plummer block arrangements with bearings swapped in situ", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still" ], "pitfalls": [ "At 150 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 22300-series series at 150 mm bore (320×108 mm) is the heavy wide-section choice — highest capacity, lowest speed limit; do not substitute a 222 or 230 series in the same bore without re-checking both life and the 2,000 r/min ceiling.", "The 22330-cck-w33 and its cylindrical-bore counterpart 22330-cc-w33 share envelope and load ratings (1539/1760 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 108 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 1539/1760 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22330 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22330-cck-w33?", "a": "The SKF 22330 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 150 mm nominal bore, 320 mm outer diameter and 108 mm width (5.906 × 12.598 × 4.252 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1539 kN, C0 1760 kN, Pu 146 kN, reference speed 1,600 r/min, limiting speed 2,000 r/min, mass about 47500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 22330-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 22330-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 150 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 22330-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 22330-cck-w33 and 22330-cc-w33?", "a": "They share the ISO 15 envelope and the same 1539/1760 kN ratings, but 22330-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22330-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "22330", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 22330; identical ISO 15 envelope, fits H2330 adapter sleeve on a 110 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22330-CCK-W33", "SKF 22330 CCK/W33", "22330 K" ], "locale_variants": {} }, { "sku": "23032-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23032 CCK/W33", "series": "23000-series", "type": "spherical_roller", "d_mm": 160, "D_mm": 240, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 614, "static_load_kN": 880, "fatigue_load_limit_kN": 83, "max_rpm": 3000, "reference_speed_rpm": 2400, "limiting_speed_rpm": 3000, "weight_g": 14500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF lists SKF 23032 CCK/W33 as the adapter-sleeve execution in the 23000-series range: a 160 mm nominal-bore spherical roller bearing whose 1:12 tapered inner ring is driven up a sleeve, with 240 mm OD and 60 mm width to the ISO 15 envelope. Reading the designation: the leading 2 marks a spherical roller bearing, the 30 is the ISO 15 dimension series (dimension series 30 (slim OD, extra-wide)), and the last two digits encode the 160 mm bore; the 240 mm OD and 60 mm width follow the ISO 15 general plan. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. With C 614 kN and C0 880 kN, the 23032-cck-w33 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. Because driving up the 1:12 taper consumes radial clearance, K executions are commonly ordered with C3 initial clearance so the residual running clearance after mounting matches the cylindrical-bore 23032-cc-w33 on an interference seat.", "applications": [ "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder", "fan and pulley shafts that need periodic bearing removal in the field" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals" ], "pitfalls": [ "At 160 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23000-series series at 160 mm bore (240×60 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "The 23032-cck-w33 and its cylindrical-bore counterpart 23032-cc-w33 share envelope and load ratings (614/880 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "The 23032-cck-w33 and its cylindrical-bore counterpart 23032-cc-w33 share envelope and load ratings (614/880 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "The 23032-cck-w33 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 614/880 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The 614/880 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23032 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23032-cck-w33?", "a": "The SKF 23032 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 160 mm nominal bore, 240 mm outer diameter and 60 mm width (6.299 × 9.449 × 2.362 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 614 kN, C0 880 kN, Pu 83 kN, reference speed 2,400 r/min, limiting speed 3,000 r/min, mass about 14500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23032-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23032-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 160 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23032-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23032-cck-w33 and 23032-cc-w33?", "a": "They share the ISO 15 envelope and the same 614/880 kN ratings, but 23032-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23032-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23032", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23032; identical ISO 15 envelope, fits H3032 adapter sleeve on a 110 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23032-CCK-W33", "SKF 23032 CCK/W33", "23032 K" ], "locale_variants": {} }, { "sku": "23132-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23132 CCK/W33", "series": "23100-series", "type": "spherical_roller", "d_mm": 160, "D_mm": 270, "B_mm": 86, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1029, "static_load_kN": 1370, "fatigue_load_limit_kN": 129, "max_rpm": 2400, "reference_speed_rpm": 1900, "limiting_speed_rpm": 2400, "weight_g": 27500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF lists SKF 23132 CCK/W33 as the adapter-sleeve execution in the 23100-series range: a 160 mm nominal-bore spherical roller bearing whose 1:12 tapered inner ring is driven up a sleeve, with 270 mm OD and 86 mm width to the ISO 15 envelope. Digit by digit, 23132-cck-w33 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 31, and bore reference 32 resolving to 160 mm; 270 mm OD and 86 mm width are the matching ISO 15 boundary values. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. The 55.0 mm radial section height ((270−160)/2) and 27500 g catalogue mass frame a 160 mm bore bearing rated at 1029 kN C — roughly 6.43 kN of dynamic capacity per millimetre of bore before application factors. Over-driving the 23132-cck-w33 up its sleeve pinches radial clearance below the residual minimum and can crack the inner ring in service; under-driving leaves the sleeve seat loose, so the ring creeps and frets the sleeve — measure, do not estimate.", "applications": [ "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "At 160 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23100-series series at 160 mm bore (270×86 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 86 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "The adapter sleeve is selected by actual shaft diameter, not by the 160 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23132-cck-w33 with different sleeves.", "The 27500 g mass and 86 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23132-cck-w33.", "The 1029/1370 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23132 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23132-cck-w33?", "a": "The SKF 23132 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 160 mm nominal bore, 270 mm outer diameter and 86 mm width (6.299 × 10.63 × 3.386 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1029 kN, C0 1370 kN, Pu 129 kN, reference speed 1,900 r/min, limiting speed 2,400 r/min, mass about 27500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23132-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23132-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 160 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23132-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23132-cck-w33 and 23132-cc-w33?", "a": "They share the ISO 15 envelope and the same 1029/1370 kN ratings, but 23132-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23132-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23132", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23132; identical ISO 15 envelope, fits H3132 adapter sleeve on a 110 mm shaft." }, { "equiv_sku": "C3132", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3132 shares the 160×270×86 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C3132-K", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3132 K shares the 160×270×86 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23132-CCK-W33", "SKF 23132 CCK/W33", "23132 K" ], "locale_variants": {} }, { "sku": "22232-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 22232 CCK/W33", "series": "22200-series", "type": "spherical_roller", "d_mm": 160, "D_mm": 290, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1043, "static_load_kN": 1290, "fatigue_load_limit_kN": 118, "max_rpm": 2800, "reference_speed_rpm": 2000, "limiting_speed_rpm": 2800, "weight_g": 29500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For sleeve mounting on a 160 mm shaft, SKF order number SKF 22232 CCK/W33 is the 1:12 tapered-bore spherical roller bearing in the 22200-series family (dimension series 22 (medium OD, wide)); the cylindrical-bore equivalent is a separate order number, 22232-cc-w33. Reading the designation: the leading 2 marks a spherical roller bearing, the 22 is the ISO 15 dimension series (dimension series 22 (medium OD, wide)), and the last two digits encode the 160 mm bore; the 290 mm OD and 80 mm width follow the ISO 15 general plan. Reading the suffix on 22232-cck-w33, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 22232-cc-w33. Selection arithmetic: the C0/C ratio is about 1.24 (static 1290 kN against dynamic 1043 kN), typical of a spherical roller sized for heavy combined loads, and the 118 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Over-driving the 22232-cck-w33 up its sleeve pinches radial clearance below the residual minimum and can crack the inner ring in service; under-driving leaves the sleeve seat loose, so the ring creeps and frets the sleeve — measure, do not estimate.", "applications": [ "SAG and ball-mill drive shafts", "large mining crusher main shafts", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat", "split-housing plummer block arrangements with bearings swapped in situ" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "smearing on the roller-raceway contact during skid starts below the minimum load" ], "pitfalls": [ "At 160 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 22200-series series at 160 mm bore (290×80 mm) is the general-purpose spherical roller envelope; stepping up to 223 adds capacity and width, stepping to 230 trims the OD — neither is interchangeable without re-checking shoulders and speed.", "The 22232-cck-w33 and its cylindrical-bore counterpart 22232-cc-w33 share envelope and load ratings (1043/1290 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 80 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "The 29500 g mass and 80 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 22232-cck-w33.", "The 1043/1290 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 22232 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 22232-cck-w33?", "a": "The SKF 22232 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 160 mm nominal bore, 290 mm outer diameter and 80 mm width (6.299 × 11.417 × 3.15 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1043 kN, C0 1290 kN, Pu 118 kN, reference speed 2,000 r/min, limiting speed 2,800 r/min, mass about 29500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 22232-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 22232-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 160 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 22232-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 22232-cck-w33 and 22232-cc-w33?", "a": "They share the ISO 15 envelope and the same 1043/1290 kN ratings, but 22232-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 22232-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "22232", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 22232; identical ISO 15 envelope, fits H3132 adapter sleeve on a 110 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "22232-CCK-W33", "SKF 22232 CCK/W33", "22232 K" ], "locale_variants": {} }, { "sku": "23232-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23232 CCK/W33", "series": "23200-series", "type": "spherical_roller", "d_mm": 160, "D_mm": 290, "B_mm": 104, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1281, "static_load_kN": 1660, "fatigue_load_limit_kN": 153, "max_rpm": 2200, "reference_speed_rpm": 1500, "limiting_speed_rpm": 2200, "weight_g": 39000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For sleeve mounting on a 160 mm shaft, SKF order number SKF 23232 CCK/W33 is the 1:12 tapered-bore spherical roller bearing in the 23200-series family (dimension series 32 (medium OD, extra wide)); the cylindrical-bore equivalent is a separate order number, 23232-cc-w33. Numbering ties the bearing to its envelope: 23232-cck-w33 means spherical-roller type, dimension series 32, 160 mm bore — which is why the 290×104 mm outline swaps dimensionally with other ISO 15 bearings of the same code. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. Selection arithmetic: the C0/C ratio is about 1.30 (static 1660 kN against dynamic 1281 kN), typical of a spherical roller sized for heavy combined loads, and the 153 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Mounting on the 1:12 taper is controlled by clearance reduction or measured axial drive-up, never by locknut torque: SKF tables give the target radial-clearance decrease for the 160 mm 23232-cck-w33, checked with feeler gauges before and after drive-up.", "applications": [ "SAG and ball-mill drive shafts", "large mining crusher main shafts", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat", "split-housing plummer block arrangements with bearings swapped in situ" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "At 160 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23200-series series at 160 mm bore (290×104 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 104 mm width changes abutment spacing, even though the 290 mm OD matches.", "The adapter sleeve is selected by actual shaft diameter, not by the 160 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23232-cck-w33 with different sleeves.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 104 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23232-cck-w33 pits long before its L10 life.", "The 1281/1660 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23232 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23232-cck-w33?", "a": "The SKF 23232 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 160 mm nominal bore, 290 mm outer diameter and 104 mm width (6.299 × 11.417 × 4.094 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1281 kN, C0 1660 kN, Pu 153 kN, reference speed 1,500 r/min, limiting speed 2,200 r/min, mass about 39000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23232-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23232-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 160 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23232-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23232-cck-w33 and 23232-cc-w33?", "a": "They share the ISO 15 envelope and the same 1281/1660 kN ratings, but 23232-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23232-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23232", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23232; identical ISO 15 envelope, fits H2332 adapter sleeve on a 110 mm shaft." }, { "equiv_sku": "C3232", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 3232 shares the 160×290×104 mm envelope but catalogue C/C0 differ (1370/1830 kN vs 1281/1660 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C3232-K", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 3232 K shares the 160×290×104 mm envelope but catalogue C/C0 differ (1370/1830 kN vs 1281/1660 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23232-CCK-W33", "SKF 23232 CCK/W33", "23232 K" ], "locale_variants": {} }, { "sku": "23034-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23034 CCK/W33", "series": "23000-series", "type": "spherical_roller", "d_mm": 170, "D_mm": 260, "B_mm": 67, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 745, "static_load_kN": 1060, "fatigue_load_limit_kN": 100, "max_rpm": 2800, "reference_speed_rpm": 2200, "limiting_speed_rpm": 2800, "weight_g": 18500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF lists SKF 23034 CCK/W33 as the adapter-sleeve execution in the 23000-series range: a 170 mm nominal-bore spherical roller bearing whose 1:12 tapered inner ring is driven up a sleeve, with 260 mm OD and 67 mm width to the ISO 15 envelope. Numbering ties the bearing to its envelope: 23034-cck-w33 means spherical-roller type, dimension series 30, 170 mm bore — which is why the 260×67 mm outline swaps dimensionally with other ISO 15 bearings of the same code. The K in the designation marks the 1:12 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. Selection arithmetic: the C0/C ratio is about 1.42 (static 1060 kN against dynamic 745 kN), typical of a spherical roller sized for heavy combined loads, and the 100 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. On an H adapter sleeve the 170 mm shaft seat only needs an h9 plain journal; slide the sleeve into the 23034-cck-w33 inner ring, tighten the KM nut against the MB washer until the catalogue clearance-reduction value is reached, then lock the washer tab.", "applications": [ "SAG and ball-mill drive shafts", "large mining crusher main shafts", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems" ], "pitfalls": [ "At 170 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23000-series series at 170 mm bore (260×67 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "The adapter sleeve is selected by actual shaft diameter, not by the 170 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23034-cck-w33 with different sleeves.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 67 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "Catalogue reference speed and limiting speed are different limits: the 2,200 r/min reference is a thermal criterion under load, while the 2,800 r/min limiting value is the mechanical ceiling — observe both.", "The 745/1060 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23034 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23034-cck-w33?", "a": "The SKF 23034 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 170 mm nominal bore, 260 mm outer diameter and 67 mm width (6.693 × 10.236 × 2.638 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 745 kN, C0 1060 kN, Pu 100 kN, reference speed 2,200 r/min, limiting speed 2,800 r/min, mass about 18500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23034-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23034-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 170 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23034-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23034-cck-w33 and 23034-cc-w33?", "a": "They share the ISO 15 envelope and the same 745/1060 kN ratings, but 23034-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23034-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23034", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23034; identical ISO 15 envelope, fits H3034 adapter sleeve on a 110 mm shaft." }, { "equiv_sku": "C3034-M", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3034 M shares the 170×260×67 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23034-CCK-W33", "SKF 23034 CCK/W33", "23034 K" ], "locale_variants": {} }, { "sku": "23134-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23134 CCK/W33", "series": "23100-series", "type": "spherical_roller", "d_mm": 170, "D_mm": 280, "B_mm": 88, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1086, "static_load_kN": 1500, "fatigue_load_limit_kN": 137, "max_rpm": 2400, "reference_speed_rpm": 1800, "limiting_speed_rpm": 2400, "weight_g": 29500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For sleeve mounting on a 170 mm shaft, SKF order number SKF 23134 CCK/W33 is the 1:12 tapered-bore spherical roller bearing in the 23100-series family (dimension series 31 (medium OD, wide)); the cylindrical-bore equivalent is a separate order number, 23134-cc-w33. On the SKF nameplate, 23134-cck-w33 follows the ISO 15 convention: 2 for the spherical roller type, 31 for the dimension series 31 (medium OD, wide), final digits 34 for the 170 mm bore. The K in the designation marks the 1:12 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. The 137 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.38 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. Because driving up the 1:12 taper consumes radial clearance, K executions are commonly ordered with C3 initial clearance so the residual running clearance after mounting matches the cylindrical-bore 23134-cc-w33 on an interference seat.", "applications": [ "steel-plant continuous-caster segments", "large induced-draft fan rotors", "split-housing plummer block arrangements with bearings swapped in situ", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems" ], "pitfalls": [ "At 170 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23100-series series at 170 mm bore (280×88 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23134-cck-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "The 23134-cck-w33 and its cylindrical-bore counterpart 23134-cc-w33 share envelope and load ratings (1086/1500 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "The 29500 g mass and 88 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23134-cck-w33.", "The 1086/1500 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23134 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23134-cck-w33?", "a": "The SKF 23134 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 170 mm nominal bore, 280 mm outer diameter and 88 mm width (6.693 × 11.024 × 3.465 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1086 kN, C0 1500 kN, Pu 137 kN, reference speed 1,800 r/min, limiting speed 2,400 r/min, mass about 29500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23134-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23134-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 170 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23134-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23134-cck-w33 and 23134-cc-w33?", "a": "They share the ISO 15 envelope and the same 1086/1500 kN ratings, but 23134-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23134-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23134", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23134; identical ISO 15 envelope, fits H3134 adapter sleeve on a 110 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23134-CCK-W33", "SKF 23134 CCK/W33", "23134 K" ], "locale_variants": {} }, { "sku": "23234-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23234 CCK/W33", "series": "23200-series", "type": "spherical_roller", "d_mm": 170, "D_mm": 310, "B_mm": 110, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1472, "static_load_kN": 1930, "fatigue_load_limit_kN": 173, "max_rpm": 2000, "reference_speed_rpm": 1400, "limiting_speed_rpm": 2000, "weight_g": 46500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF 23234 CCK/W33 in SKF catalogue PUB BU/P1 17000 is a double-row spherical roller bearing with a tapered bore (1:12), intended for an H-series adapter sleeve or AH withdrawal sleeve, with two pressed-steel cages with a floating guide ring and the same 170×310×110 mm ISO 15 outline as its cylindrical-bore counterpart. The code breaks down as type digit 2 (double-row spherical roller), dimension series 32 (dimension series 32 (medium OD, extra wide)), and bore code 34 = 170 mm; dimensions 170×310×110 mm therefore match the ISO 15 envelope. The K in the designation marks the 1:12 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. With C 1472 kN and C0 1930 kN, the 23234-cck-w33 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. At 170 mm bore, dismount after service is by KM locknut reversal or a hydraulic nut on larger sizes; oil-injection grooves on the bigger sleeves let pressurised oil float the 23234-cck-w33 off the taper without scoring either surface.", "applications": [ "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "fan and pulley shafts that need periodic bearing removal in the field", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems" ], "pitfalls": [ "At 170 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23200-series series at 170 mm bore (310×110 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 110 mm width changes abutment spacing, even though the 310 mm OD matches.", "The 23234-cck-w33 and its cylindrical-bore counterpart 23234-cc-w33 share envelope and load ratings (1472/1930 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23234-cck-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23234-cck-w33 pits long before its L10 life.", "The 1472/1930 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23234 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23234-cck-w33?", "a": "The SKF 23234 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 170 mm nominal bore, 310 mm outer diameter and 110 mm width (6.693 × 12.205 × 4.331 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1472 kN, C0 1930 kN, Pu 173 kN, reference speed 1,400 r/min, limiting speed 2,000 r/min, mass about 46500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23234-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23234-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 170 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23234-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23234-cck-w33 and 23234-cc-w33?", "a": "They share the ISO 15 envelope and the same 1472/1930 kN ratings, but 23234-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23234-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23234", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23234; identical ISO 15 envelope, fits H2334 adapter sleeve on a 110 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23234-CCK-W33", "SKF 23234 CCK/W33", "23234 K" ], "locale_variants": {} }, { "sku": "23936-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23936 CCK/W33", "series": "23900-series", "type": "spherical_roller", "d_mm": 180, "D_mm": 250, "B_mm": 52, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 519, "static_load_kN": 830, "fatigue_load_limit_kN": 76.5, "max_rpm": 2800, "reference_speed_rpm": 2600, "limiting_speed_rpm": 2800, "weight_g": 13500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF 23936 CCK/W33 in SKF catalogue PUB BU/P1 17000 is a double-row spherical roller bearing with a tapered bore (1:12), intended for an H-series adapter sleeve or AH withdrawal sleeve, with two pressed-steel cages with a floating guide ring and the same 180×250×52 mm ISO 15 outline as its cylindrical-bore counterpart. Digit by digit, 23936-cck-w33 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 39, and bore reference 36 resolving to 180 mm; 250 mm OD and 52 mm width are the matching ISO 15 boundary values. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. The 35.0 mm radial section height ((250−180)/2) and 13500 g catalogue mass frame a 180 mm bore bearing rated at 519 kN C — roughly 2.88 kN of dynamic capacity per millimetre of bore before application factors. Because driving up the 1:12 taper consumes radial clearance, K executions are commonly ordered with C3 initial clearance so the residual running clearance after mounting matches the cylindrical-bore 23936-cc-w33 on an interference seat.", "applications": [ "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder", "fan and pulley shafts that need periodic bearing removal in the field" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals" ], "pitfalls": [ "At 180 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23900-series series at 180 mm bore (250×52 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "The adapter sleeve is selected by actual shaft diameter, not by the 180 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23936-cck-w33 with different sleeves.", "The adapter sleeve is selected by actual shaft diameter, not by the 180 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23936-cck-w33 with different sleeves.", "Catalogue reference speed and limiting speed are different limits: the 2,600 r/min reference is a thermal criterion under load, while the 2,800 r/min limiting value is the mechanical ceiling — observe both.", "The 519/830 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23936 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23936-cck-w33?", "a": "The SKF 23936 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 180 mm nominal bore, 250 mm outer diameter and 52 mm width (7.087 × 9.843 × 2.047 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 519 kN, C0 830 kN, Pu 76.5 kN, reference speed 2,600 r/min, limiting speed 2,800 r/min, mass about 13500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23936-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23936-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 180 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23936-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23936-cck-w33 and 23936-cc-w33?", "a": "They share the ISO 15 envelope and the same 519/830 kN ratings, but 23936-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23936-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23936", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23936; identical ISO 15 envelope, fits H3936 adapter sleeve on a 160 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23936-CCK-W33", "SKF 23936 CCK/W33", "23936 K" ], "locale_variants": {} }, { "sku": "23036-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23036 CCK/W33", "series": "23000-series", "type": "spherical_roller", "d_mm": 180, "D_mm": 280, "B_mm": 74, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 883, "static_load_kN": 1250, "fatigue_load_limit_kN": 114, "max_rpm": 2600, "reference_speed_rpm": 2000, "limiting_speed_rpm": 2600, "weight_g": 23000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For sleeve mounting on a 180 mm shaft, SKF order number SKF 23036 CCK/W33 is the 1:12 tapered-bore spherical roller bearing in the 23000-series family (dimension series 30 (slim OD, extra-wide)); the cylindrical-bore equivalent is a separate order number, 23036-cc-w33. The code breaks down as type digit 2 (double-row spherical roller), dimension series 30 (dimension series 30 (slim OD, extra-wide)), and bore code 36 = 180 mm; dimensions 180×280×74 mm therefore match the ISO 15 envelope. Reading the suffix on 23036-cck-w33, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 23036-cc-w33. With C 883 kN and C0 1250 kN, the 23036-cck-w33 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. After drive-up, re-check radial clearance and then swing the outer ring through its self-aligning range: the sphered raceway of the 23036-cck-w33 must still tilt ≈ 0.5–2.5° freely — a joint that binds after sleeve mounting signals excessive drive-up or a cocked sleeve.", "applications": [ "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "smearing on the roller-raceway contact during skid starts below the minimum load" ], "pitfalls": [ "At 180 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23000-series series at 180 mm bore (280×74 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "The 23036-cck-w33 and its cylindrical-bore counterpart 23036-cc-w33 share envelope and load ratings (883/1250 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23036-cck-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "Catalogue reference speed and limiting speed are different limits: the 2,000 r/min reference is a thermal criterion under load, while the 2,600 r/min limiting value is the mechanical ceiling — observe both.", "The 883/1250 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23036 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23036-cck-w33?", "a": "The SKF 23036 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 180 mm nominal bore, 280 mm outer diameter and 74 mm width (7.087 × 11.024 × 2.913 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 883 kN, C0 1250 kN, Pu 114 kN, reference speed 2,000 r/min, limiting speed 2,600 r/min, mass about 23000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23036-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23036-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 180 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23036-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23036-cck-w33 and 23036-cc-w33?", "a": "They share the ISO 15 envelope and the same 883/1250 kN ratings, but 23036-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23036-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23036", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23036; identical ISO 15 envelope, fits H3036 adapter sleeve on a 160 mm shaft." }, { "equiv_sku": "C3036", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3036 shares the 180×280×74 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C3036-K", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3036 K shares the 180×280×74 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23036-CCK-W33", "SKF 23036 CCK/W33", "23036 K" ], "locale_variants": {} }, { "sku": "23136-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23136 CCK/W33", "series": "23100-series", "type": "spherical_roller", "d_mm": 180, "D_mm": 300, "B_mm": 96, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1263, "static_load_kN": 1760, "fatigue_load_limit_kN": 160, "max_rpm": 2200, "reference_speed_rpm": 1700, "limiting_speed_rpm": 2200, "weight_g": 37000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For sleeve mounting on a 180 mm shaft, SKF order number SKF 23136 CCK/W33 is the 1:12 tapered-bore spherical roller bearing in the 23100-series family (dimension series 31 (medium OD, wide)); the cylindrical-bore equivalent is a separate order number, 23136-cc-w33. Reading the designation: the leading 2 marks a spherical roller bearing, the 31 is the ISO 15 dimension series (dimension series 31 (medium OD, wide)), and the last two digits encode the 180 mm bore; the 300 mm OD and 96 mm width follow the ISO 15 general plan. The K in the designation marks the 1:12 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. Speed planning uses two different ceilings: 1,700 r/min thermal reference and 2,200 r/min mechanical limiting speed. Mounting on the 1:12 taper is controlled by clearance reduction or measured axial drive-up, never by locknut torque: SKF tables give the target radial-clearance decrease for the 180 mm 23136-cck-w33, checked with feeler gauges before and after drive-up.", "applications": [ "large mining crusher main shafts", "wind-turbine main shaft support", "fan and pulley shafts that need periodic bearing removal in the field", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 180 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23100-series series at 180 mm bore (300×96 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 96 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "The adapter sleeve is selected by actual shaft diameter, not by the 180 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23136-cck-w33 with different sleeves.", "The 37000 g mass and 96 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23136-cck-w33.", "The 1263/1760 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23136 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23136-cck-w33?", "a": "The SKF 23136 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 180 mm nominal bore, 300 mm outer diameter and 96 mm width (7.087 × 11.811 × 3.78 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1263 kN, C0 1760 kN, Pu 160 kN, reference speed 1,700 r/min, limiting speed 2,200 r/min, mass about 37000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23136-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23136-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 180 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23136-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23136-cck-w33 and 23136-cc-w33?", "a": "They share the ISO 15 envelope and the same 1263/1760 kN ratings, but 23136-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23136-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23136", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23136; identical ISO 15 envelope, fits H3136 adapter sleeve on a 160 mm shaft." }, { "equiv_sku": "C3136", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3136 shares the 180×300×96 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C3136-K", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3136 K shares the 180×300×96 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23136-CCK-W33", "SKF 23136 CCK/W33", "23136 K" ], "locale_variants": {} }, { "sku": "23236-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23236 CCK/W33", "series": "23200-series", "type": "spherical_roller", "d_mm": 180, "D_mm": 320, "B_mm": 112, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1557, "static_load_kN": 2120, "fatigue_load_limit_kN": 186, "max_rpm": 1900, "reference_speed_rpm": 1300, "limiting_speed_rpm": 1900, "weight_g": 49500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF 23236 CCK/W33 in SKF catalogue PUB BU/P1 17000 is a double-row spherical roller bearing with a tapered bore (1:12), intended for an H-series adapter sleeve or AH withdrawal sleeve, with two pressed-steel cages with a floating guide ring and the same 180×320×112 mm ISO 15 outline as its cylindrical-bore counterpart. Digit by digit, 23236-cck-w33 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 32, and bore reference 36 resolving to 180 mm; 320 mm OD and 112 mm width are the matching ISO 15 boundary values. Reading the suffix on 23236-cck-w33, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 23236-cc-w33. Selection arithmetic: the C0/C ratio is about 1.36 (static 2120 kN against dynamic 1557 kN), typical of a spherical roller sized for heavy combined loads, and the 186 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Because driving up the 1:12 taper consumes radial clearance, K executions are commonly ordered with C3 initial clearance so the residual running clearance after mounting matches the cylindrical-bore 23236-cc-w33 on an interference seat.", "applications": [ "SAG and ball-mill drive shafts", "large mining crusher main shafts", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder", "fan and pulley shafts that need periodic bearing removal in the field" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "At 180 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23200-series series at 180 mm bore (320×112 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 112 mm width changes abutment spacing, even though the 320 mm OD matches.", "The adapter sleeve is selected by actual shaft diameter, not by the 180 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23236-cck-w33 with different sleeves.", "The 23236-cck-w33 and its cylindrical-bore counterpart 23236-cc-w33 share envelope and load ratings (1557/2120 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 1557/2120 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23236 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23236-cck-w33?", "a": "The SKF 23236 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 180 mm nominal bore, 320 mm outer diameter and 112 mm width (7.087 × 12.598 × 4.409 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1557 kN, C0 2120 kN, Pu 186 kN, reference speed 1,300 r/min, limiting speed 1,900 r/min, mass about 49500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23236-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23236-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 180 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23236-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23236-cck-w33 and 23236-cc-w33?", "a": "They share the ISO 15 envelope and the same 1557/2120 kN ratings, but 23236-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23236-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23236", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23236; identical ISO 15 envelope, fits H2336 adapter sleeve on a 160 mm shaft." }, { "equiv_sku": "C3236", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3236 shares the 180×320×112 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C3236-K", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3236 K shares the 180×320×112 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23236-CCK-W33", "SKF 23236 CCK/W33", "23236 K" ], "locale_variants": {} }, { "sku": "23938-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23938 CCK/W33", "series": "23900-series", "type": "spherical_roller", "d_mm": 190, "D_mm": 260, "B_mm": 52, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 499, "static_load_kN": 800, "fatigue_load_limit_kN": 76.5, "max_rpm": 2600, "reference_speed_rpm": 2400, "limiting_speed_rpm": 2600, "weight_g": 14500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF 23938 CCK/W33 in SKF catalogue PUB BU/P1 17000 is a double-row spherical roller bearing with a tapered bore (1:12), intended for an H-series adapter sleeve or AH withdrawal sleeve, with two pressed-steel cages with a floating guide ring and the same 190×260×52 mm ISO 15 outline as its cylindrical-bore counterpart. On the SKF nameplate, 23938-cck-w33 follows the ISO 15 convention: 2 for the spherical roller type, 39 for the dimension series 39 (compact OD, narrow), final digits 38 for the 190 mm bore. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. The 76.5 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.60 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. Mounting on the 1:12 taper is controlled by clearance reduction or measured axial drive-up, never by locknut torque: SKF tables give the target radial-clearance decrease for the 190 mm 23938-cck-w33, checked with feeler gauges before and after drive-up.", "applications": [ "steel-plant continuous-caster segments", "large induced-draft fan rotors", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "At 190 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23900-series series at 190 mm bore (260×52 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "The 23938-cck-w33 and its cylindrical-bore counterpart 23938-cc-w33 share envelope and load ratings (499/800 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "The 23938-cck-w33 and its cylindrical-bore counterpart 23938-cc-w33 share envelope and load ratings (499/800 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "Catalogue reference speed and limiting speed are different limits: the 2,400 r/min reference is a thermal criterion under load, while the 2,600 r/min limiting value is the mechanical ceiling — observe both.", "The 499/800 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23938 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23938-cck-w33?", "a": "The SKF 23938 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 190 mm nominal bore, 260 mm outer diameter and 52 mm width (7.48 × 10.236 × 2.047 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 499 kN, C0 800 kN, Pu 76.5 kN, reference speed 2,400 r/min, limiting speed 2,600 r/min, mass about 14500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23938-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23938-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 190 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23938-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23938-cck-w33 and 23938-cc-w33?", "a": "They share the ISO 15 envelope and the same 499/800 kN ratings, but 23938-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23938-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23938", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23938; identical ISO 15 envelope, fits H3938 adapter sleeve on a 170 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23938-CCK-W33", "SKF 23938 CCK/W33", "23938 K" ], "locale_variants": {} }, { "sku": "23038-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23038 CCK/W33", "series": "23000-series", "type": "spherical_roller", "d_mm": 190, "D_mm": 290, "B_mm": 75, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 916, "static_load_kN": 1340, "fatigue_load_limit_kN": 122, "max_rpm": 2400, "reference_speed_rpm": 1900, "limiting_speed_rpm": 2400, "weight_g": 25000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For sleeve mounting on a 190 mm shaft, SKF order number SKF 23038 CCK/W33 is the 1:12 tapered-bore spherical roller bearing in the 23000-series family (dimension series 30 (slim OD, extra-wide)); the cylindrical-bore equivalent is a separate order number, 23038-cc-w33. Digit by digit, 23038-cck-w33 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 30, and bore reference 38 resolving to 190 mm; 290 mm OD and 75 mm width are the matching ISO 15 boundary values. Reading the suffix on 23038-cck-w33, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 23038-cc-w33. At 1,900 r/min reference speed the 50.0 mm-section 23038-cck-w33 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 2,400 r/min as the mechanical ceiling. Because driving up the 1:12 taper consumes radial clearance, K executions are commonly ordered with C3 initial clearance so the residual running clearance after mounting matches the cylindrical-bore 23038-cc-w33 on an interference seat.", "applications": [ "large induced-draft fan rotors", "SAG and ball-mill drive shafts", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat", "split-housing plummer block arrangements with bearings swapped in situ" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "At 190 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23000-series series at 190 mm bore (290×75 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "The adapter sleeve is selected by actual shaft diameter, not by the 190 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23038-cck-w33 with different sleeves.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 75 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "Catalogue reference speed and limiting speed are different limits: the 1,900 r/min reference is a thermal criterion under load, while the 2,400 r/min limiting value is the mechanical ceiling — observe both.", "The 916/1340 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23038 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23038-cck-w33?", "a": "The SKF 23038 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 190 mm nominal bore, 290 mm outer diameter and 75 mm width (7.48 × 11.417 × 2.953 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 916 kN, C0 1340 kN, Pu 122 kN, reference speed 1,900 r/min, limiting speed 2,400 r/min, mass about 25000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23038-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23038-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 190 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23038-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23038-cck-w33 and 23038-cc-w33?", "a": "They share the ISO 15 envelope and the same 916/1340 kN ratings, but 23038-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23038-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23038", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23038; identical ISO 15 envelope, fits H3038 adapter sleeve on a 170 mm shaft." }, { "equiv_sku": "C3038", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3038 shares the 190×290×75 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C3038-K", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3038 K shares the 190×290×75 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23038-CCK-W33", "SKF 23038 CCK/W33", "23038 K" ], "locale_variants": {} }, { "sku": "23138-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23138 CCK/W33", "series": "23100-series", "type": "spherical_roller", "d_mm": 190, "D_mm": 320, "B_mm": 104, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1456, "static_load_kN": 2080, "fatigue_load_limit_kN": 183, "max_rpm": 2000, "reference_speed_rpm": 1500, "limiting_speed_rpm": 2000, "weight_g": 44500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF 23138 CCK/W33 in SKF catalogue PUB BU/P1 17000 is a double-row spherical roller bearing with a tapered bore (1:12), intended for an H-series adapter sleeve or AH withdrawal sleeve, with two pressed-steel cages with a floating guide ring and the same 190×320×104 mm ISO 15 outline as its cylindrical-bore counterpart. Numbering ties the bearing to its envelope: 23138-cck-w33 means spherical-roller type, dimension series 31, 190 mm bore — which is why the 320×104 mm outline swaps dimensionally with other ISO 15 bearings of the same code. Reading the suffix on 23138-cck-w33, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 23138-cc-w33. Catalogue mass 44500 g for the 190×320×104 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. At 190 mm bore, dismount after service is by KM locknut reversal or a hydraulic nut on larger sizes; oil-injection grooves on the bigger sleeves let pressurised oil float the 23138-cck-w33 off the taper without scoring either surface.", "applications": [ "large dredger and marine winch drums", "steel-plant continuous-caster segments", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder", "fan and pulley shafts that need periodic bearing removal in the field" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "At 190 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23100-series series at 190 mm bore (320×104 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23138-cck-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "The 23138-cck-w33 and its cylindrical-bore counterpart 23138-cc-w33 share envelope and load ratings (1456/2080 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "The 44500 g mass and 104 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23138-cck-w33.", "The 1456/2080 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23138 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23138-cck-w33?", "a": "The SKF 23138 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 190 mm nominal bore, 320 mm outer diameter and 104 mm width (7.48 × 12.598 × 4.094 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1456 kN, C0 2080 kN, Pu 183 kN, reference speed 1,500 r/min, limiting speed 2,000 r/min, mass about 44500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23138-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23138-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 190 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23138-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23138-cck-w33 and 23138-cc-w33?", "a": "They share the ISO 15 envelope and the same 1456/2080 kN ratings, but 23138-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23138-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23138", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23138; identical ISO 15 envelope, fits H3138 adapter sleeve on a 170 mm shaft." }, { "equiv_sku": "C3138-V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 3138 V shares the 190×320×104 mm envelope but catalogue C/C0 differ (1700/2550 kN vs 1456/2080 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C3138-KV", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 3138 KV shares the 190×320×104 mm envelope but catalogue C/C0 differ (1700/2550 kN vs 1456/2080 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23138-CCK-W33", "SKF 23138 CCK/W33", "23138 K" ], "locale_variants": {} }, { "sku": "23238-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23238 CCK/W33", "series": "23200-series", "type": "spherical_roller", "d_mm": 190, "D_mm": 340, "B_mm": 120, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1759, "static_load_kN": 2400, "fatigue_load_limit_kN": 208, "max_rpm": 1800, "reference_speed_rpm": 1300, "limiting_speed_rpm": 1800, "weight_g": 59000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "23238-cck-w33 is the 1:12 tapered-bore execution of the 23200-series spherical roller bearing: the same two barrel-roller rows on a sphered outer raceway as 23238-cc-w33, but the inner-ring bore tapers 1 mm per 12 mm for adapter- or withdrawal-sleeve mounting, as listed by SKF in SKF catalogue PUB BU/P1 17000. On the SKF nameplate, 23238-cck-w33 follows the ISO 15 convention: 2 for the spherical roller type, 32 for the dimension series 32 (medium OD, extra wide), final digits 38 for the 190 mm bore. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. With C 1759 kN and C0 2400 kN, the 23238-cck-w33 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. For shafts with a locating shoulder, use an AH withdrawal sleeve instead of an adapter sleeve: the bearing presses against the shoulder and the sleeve is drawn out for dismounting, making the 23238-cck-w33 removable without an induction heater.", "applications": [ "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still" ], "pitfalls": [ "At 190 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23200-series series at 190 mm bore (340×120 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 120 mm width changes abutment spacing, even though the 340 mm OD matches.", "The 23238-cck-w33 and its cylindrical-bore counterpart 23238-cc-w33 share envelope and load ratings (1759/2400 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "The adapter sleeve is selected by actual shaft diameter, not by the 190 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23238-cck-w33 with different sleeves.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 1759/2400 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23238 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23238-cck-w33?", "a": "The SKF 23238 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 190 mm nominal bore, 340 mm outer diameter and 120 mm width (7.48 × 13.386 × 4.724 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1759 kN, C0 2400 kN, Pu 208 kN, reference speed 1,300 r/min, limiting speed 1,800 r/min, mass about 59000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23238-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23238-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 190 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23238-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23238-cck-w33 and 23238-cc-w33?", "a": "They share the ISO 15 envelope and the same 1759/2400 kN ratings, but 23238-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23238-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23238", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23238; identical ISO 15 envelope, fits H2338 adapter sleeve on a 170 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23238-CCK-W33", "SKF 23238 CCK/W33", "23238 K" ], "locale_variants": {} }, { "sku": "23940-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23940 CCK/W33", "series": "23900-series", "type": "spherical_roller", "d_mm": 200, "D_mm": 280, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 651, "static_load_kN": 1040, "fatigue_load_limit_kN": 93, "max_rpm": 2400, "reference_speed_rpm": 2200, "limiting_speed_rpm": 2400, "weight_g": 19000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The SKF 23940 CCK/W33 is a 200×280×60 mm spherical roller bearing with a 1:12 tapered bore — SKF catalogue execution for sleeve mounting on a 200 mm plain shaft, retaining the double-row self-aligning barrel-roller design. The code breaks down as type digit 2 (double-row spherical roller), dimension series 39 (dimension series 39 (compact OD, narrow)), and bore code 40 = 200 mm; dimensions 200×280×60 mm therefore match the ISO 15 envelope. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. The 93 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.60 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. For shafts with a locating shoulder, use an AH withdrawal sleeve instead of an adapter sleeve: the bearing presses against the shoulder and the sleeve is drawn out for dismounting, making the 23940-cck-w33 removable without an induction heater.", "applications": [ "steel-plant continuous-caster segments", "large induced-draft fan rotors", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat", "split-housing plummer block arrangements with bearings swapped in situ" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "At 200 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23900-series series at 200 mm bore (280×60 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "The 23940-cck-w33 and its cylindrical-bore counterpart 23940-cc-w33 share envelope and load ratings (651/1040 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "The 23940-cck-w33 and its cylindrical-bore counterpart 23940-cc-w33 share envelope and load ratings (651/1040 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23940-cck-w33; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 651/1040 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23940 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23940-cck-w33?", "a": "The SKF 23940 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 200 mm nominal bore, 280 mm outer diameter and 60 mm width (7.874 × 11.024 × 2.362 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 651 kN, C0 1040 kN, Pu 93 kN, reference speed 2,200 r/min, limiting speed 2,400 r/min, mass about 19000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23940-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23940-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 200 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23940-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23940-cck-w33 and 23940-cc-w33?", "a": "They share the ISO 15 envelope and the same 651/1040 kN ratings, but 23940-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23940-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23940", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23940; identical ISO 15 envelope, fits H3940 adapter sleeve on a 180 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23940-CCK-W33", "SKF 23940 CCK/W33", "23940 K" ], "locale_variants": {} }, { "sku": "23040-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23040 CCK/W33", "series": "23000-series", "type": "spherical_roller", "d_mm": 200, "D_mm": 310, "B_mm": 82, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1058, "static_load_kN": 1530, "fatigue_load_limit_kN": 137, "max_rpm": 2200, "reference_speed_rpm": 1800, "limiting_speed_rpm": 2200, "weight_g": 31500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "23040-cck-w33 is the 1:12 tapered-bore execution of the 23000-series spherical roller bearing: the same two barrel-roller rows on a sphered outer raceway as 23040-cc-w33, but the inner-ring bore tapers 1 mm per 12 mm for adapter- or withdrawal-sleeve mounting, as listed by SKF in SKF catalogue PUB BU/P1 17000. Numbering ties the bearing to its envelope: 23040-cck-w33 means spherical-roller type, dimension series 30, 200 mm bore — which is why the 310×82 mm outline swaps dimensionally with other ISO 15 bearings of the same code. The K in the designation marks the 1:12 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. The 137 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.45 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. On an H adapter sleeve the 200 mm shaft seat only needs an h9 plain journal; slide the sleeve into the 23040-cck-w33 inner ring, tighten the KM nut against the MB washer until the catalogue clearance-reduction value is reached, then lock the washer tab.", "applications": [ "steel-plant continuous-caster segments", "large induced-draft fan rotors", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 200 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23000-series series at 200 mm bore (310×82 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "The adapter sleeve is selected by actual shaft diameter, not by the 200 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23040-cck-w33 with different sleeves.", "The adapter sleeve is selected by actual shaft diameter, not by the 200 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23040-cck-w33 with different sleeves.", "Catalogue reference speed and limiting speed are different limits: the 1,800 r/min reference is a thermal criterion under load, while the 2,200 r/min limiting value is the mechanical ceiling — observe both.", "The 1058/1530 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23040 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23040-cck-w33?", "a": "The SKF 23040 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 200 mm nominal bore, 310 mm outer diameter and 82 mm width (7.874 × 12.205 × 3.228 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1058 kN, C0 1530 kN, Pu 137 kN, reference speed 1,800 r/min, limiting speed 2,200 r/min, mass about 31500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23040-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23040-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 200 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23040-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23040-cck-w33 and 23040-cc-w33?", "a": "They share the ISO 15 envelope and the same 1058/1530 kN ratings, but 23040-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23040-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23040", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23040; identical ISO 15 envelope, fits H3040 adapter sleeve on a 180 mm shaft." }, { "equiv_sku": "C3040", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 3040 shares the 200×310×82 mm envelope but catalogue C/C0 differ (1120/1730 kN vs 1058/1530 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C3040-K", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 3040 K shares the 200×310×82 mm envelope but catalogue C/C0 differ (1120/1730 kN vs 1058/1530 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23040-CCK-W33", "SKF 23040 CCK/W33", "23040 K" ], "locale_variants": {} }, { "sku": "23140-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23140 CCK/W33", "series": "23100-series", "type": "spherical_roller", "d_mm": 200, "D_mm": 340, "B_mm": 112, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1665, "static_load_kN": 2360, "fatigue_load_limit_kN": 204, "max_rpm": 1900, "reference_speed_rpm": 1500, "limiting_speed_rpm": 1900, "weight_g": 55500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The SKF 23140 CCK/W33 is a 200×340×112 mm spherical roller bearing with a 1:12 tapered bore — SKF catalogue execution for sleeve mounting on a 200 mm plain shaft, retaining the double-row self-aligning barrel-roller design. On the SKF nameplate, 23140-cck-w33 follows the ISO 15 convention: 2 for the spherical roller type, 31 for the dimension series 31 (medium OD, wide), final digits 40 for the 200 mm bore. Reading the suffix on 23140-cck-w33, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 23140-cc-w33. Catalogue mass 55500 g for the 200×340×112 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. Mounting on the 1:12 taper is controlled by clearance reduction or measured axial drive-up, never by locknut torque: SKF tables give the target radial-clearance decrease for the 200 mm 23140-cck-w33, checked with feeler gauges before and after drive-up.", "applications": [ "large dredger and marine winch drums", "steel-plant continuous-caster segments", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "At 200 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23100-series series at 200 mm bore (340×112 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23140-cck-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "The 23140-cck-w33 and its cylindrical-bore counterpart 23140-cc-w33 share envelope and load ratings (1665/2360 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "The 23140-cck-w33 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 1665/2360 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The 1665/2360 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23140 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23140-cck-w33?", "a": "The SKF 23140 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 200 mm nominal bore, 340 mm outer diameter and 112 mm width (7.874 × 13.386 × 4.409 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1665 kN, C0 2360 kN, Pu 204 kN, reference speed 1,500 r/min, limiting speed 1,900 r/min, mass about 55500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23140-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23140-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 200 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23140-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23140-cck-w33 and 23140-cc-w33?", "a": "They share the ISO 15 envelope and the same 1665/2360 kN ratings, but 23140-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23140-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23140", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23140; identical ISO 15 envelope, fits H3140 adapter sleeve on a 180 mm shaft." }, { "equiv_sku": "C3140", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3140 shares the 200×340×112 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C3140-K", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3140 K shares the 200×340×112 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23140-CCK-W33", "SKF 23140 CCK/W33", "23140 K" ], "locale_variants": {} }, { "sku": "23240-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23240 CCK/W33", "series": "23200-series", "type": "spherical_roller", "d_mm": 200, "D_mm": 360, "B_mm": 128, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1947, "static_load_kN": 2700, "fatigue_load_limit_kN": 228, "max_rpm": 1700, "reference_speed_rpm": 1200, "limiting_speed_rpm": 1700, "weight_g": 70000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 23240-cck-w33 denotes the tapered-bore version (K suffix, taper 1:12) of the 23200-series spherical roller bearing: dimensioned 200×360×128 mm, it seats on an adapter or withdrawal sleeve rather than directly on a machined journal. The code breaks down as type digit 2 (double-row spherical roller), dimension series 32 (dimension series 32 (medium OD, extra wide)), and bore code 40 = 200 mm; dimensions 200×360×128 mm therefore match the ISO 15 envelope. Reading the suffix on 23240-cck-w33, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 23240-cc-w33. The 80.0 mm radial section height ((360−200)/2) and 70000 g catalogue mass frame a 200 mm bore bearing rated at 1947 kN C — roughly 9.73 kN of dynamic capacity per millimetre of bore before application factors. After drive-up, re-check radial clearance and then swing the outer ring through its self-aligning range: the sphered raceway of the 23240-cck-w33 must still tilt ≈ 0.5–2.5° freely — a joint that binds after sleeve mounting signals excessive drive-up or a cocked sleeve.", "applications": [ "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat", "split-housing plummer block arrangements with bearings swapped in situ" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "At 200 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23200-series series at 200 mm bore (360×128 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 128 mm width changes abutment spacing, even though the 360 mm OD matches.", "The 23240-cck-w33 and its cylindrical-bore counterpart 23240-cc-w33 share envelope and load ratings (1947/2700 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23240-cck-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 1947/2700 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23240 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23240-cck-w33?", "a": "The SKF 23240 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 200 mm nominal bore, 360 mm outer diameter and 128 mm width (7.874 × 14.173 × 5.039 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1947 kN, C0 2700 kN, Pu 228 kN, reference speed 1,200 r/min, limiting speed 1,700 r/min, mass about 70000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23240-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23240-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 200 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23240-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23240-cck-w33 and 23240-cc-w33?", "a": "They share the ISO 15 envelope and the same 1947/2700 kN ratings, but 23240-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23240-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23240", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23240; identical ISO 15 envelope, fits H2340 adapter sleeve on a 180 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23240-CCK-W33", "SKF 23240 CCK/W33", "23240 K" ], "locale_variants": {} }, { "sku": "23944-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23944 CCK/W33", "series": "23900-series", "type": "spherical_roller", "d_mm": 220, "D_mm": 300, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 661, "static_load_kN": 1080, "fatigue_load_limit_kN": 93, "max_rpm": 2200, "reference_speed_rpm": 2000, "limiting_speed_rpm": 2200, "weight_g": 22500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 23944-cck-w33 denotes the tapered-bore version (K suffix, taper 1:12) of the 23900-series spherical roller bearing: dimensioned 220×300×60 mm, it seats on an adapter or withdrawal sleeve rather than directly on a machined journal. On the SKF nameplate, 23944-cck-w33 follows the ISO 15 convention: 2 for the spherical roller type, 39 for the dimension series 39 (compact OD, narrow), final digits 44 for the 220 mm bore. The K in the designation marks the 1:12 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. Catalogue mass 22500 g for the 220×300×60 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. On an H adapter sleeve the 220 mm shaft seat only needs an h9 plain journal; slide the sleeve into the 23944-cck-w33 inner ring, tighten the KM nut against the MB washer until the catalogue clearance-reduction value is reached, then lock the washer tab.", "applications": [ "large dredger and marine winch drums", "steel-plant continuous-caster segments", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 220 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23900-series series at 220 mm bore (300×60 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "The 23944-cck-w33 and its cylindrical-bore counterpart 23944-cc-w33 share envelope and load ratings (661/1080 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "The 23944-cck-w33 and its cylindrical-bore counterpart 23944-cc-w33 share envelope and load ratings (661/1080 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23944-cck-w33; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 661/1080 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23944 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23944-cck-w33?", "a": "The SKF 23944 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 220 mm nominal bore, 300 mm outer diameter and 60 mm width (8.661 × 11.811 × 2.362 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 661 kN, C0 1080 kN, Pu 93 kN, reference speed 2,000 r/min, limiting speed 2,200 r/min, mass about 22500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23944-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23944-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 220 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23944-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23944-cck-w33 and 23944-cc-w33?", "a": "They share the ISO 15 envelope and the same 661/1080 kN ratings, but 23944-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23944-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23944", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23944; identical ISO 15 envelope, fits OH3944 adapter sleeve on a 200 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23944-CCK-W33", "SKF 23944 CCK/W33", "23944 K" ], "locale_variants": {} }, { "sku": "23044-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23044 CCK/W33", "series": "23000-series", "type": "spherical_roller", "d_mm": 220, "D_mm": 340, "B_mm": 90, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1261, "static_load_kN": 1860, "fatigue_load_limit_kN": 163, "max_rpm": 2000, "reference_speed_rpm": 1600, "limiting_speed_rpm": 2000, "weight_g": 39500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The SKF 23044 CCK/W33 is a 220×340×90 mm spherical roller bearing with a 1:12 tapered bore — SKF catalogue execution for sleeve mounting on a 220 mm plain shaft, retaining the double-row self-aligning barrel-roller design. Digit by digit, 23044-cck-w33 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 30, and bore reference 44 resolving to 220 mm; 340 mm OD and 90 mm width are the matching ISO 15 boundary values. Reading the suffix on 23044-cck-w33, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 23044-cc-w33. Catalogue mass 39500 g for the 220×340×90 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. Because driving up the 1:12 taper consumes radial clearance, K executions are commonly ordered with C3 initial clearance so the residual running clearance after mounting matches the cylindrical-bore 23044-cc-w33 on an interference seat.", "applications": [ "large dredger and marine winch drums", "steel-plant continuous-caster segments", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat", "split-housing plummer block arrangements with bearings swapped in situ" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "smearing on the roller-raceway contact during skid starts below the minimum load" ], "pitfalls": [ "At 220 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23000-series series at 220 mm bore (340×90 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "The adapter sleeve is selected by actual shaft diameter, not by the 220 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23044-cck-w33 with different sleeves.", "The adapter sleeve is selected by actual shaft diameter, not by the 220 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23044-cck-w33 with different sleeves.", "Catalogue reference speed and limiting speed are different limits: the 1,600 r/min reference is a thermal criterion under load, while the 2,000 r/min limiting value is the mechanical ceiling — observe both.", "The 1261/1860 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23044 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23044-cck-w33?", "a": "The SKF 23044 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 220 mm nominal bore, 340 mm outer diameter and 90 mm width (8.661 × 13.386 × 3.543 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1261 kN, C0 1860 kN, Pu 163 kN, reference speed 1,600 r/min, limiting speed 2,000 r/min, mass about 39500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23044-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23044-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 220 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23044-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23044-cck-w33 and 23044-cc-w33?", "a": "They share the ISO 15 envelope and the same 1261/1860 kN ratings, but 23044-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23044-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23044", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23044; identical ISO 15 envelope, fits OH3044 adapter sleeve on a 200 mm shaft." }, { "equiv_sku": "C3044", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3044 shares the 220×340×90 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C3044-K", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3044 K shares the 220×340×90 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23044-CCK-W33", "SKF 23044 CCK/W33", "23044 K" ], "locale_variants": {} }, { "sku": "23144-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23144 CCK/W33", "series": "23100-series", "type": "spherical_roller", "d_mm": 220, "D_mm": 370, "B_mm": 120, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1888, "static_load_kN": 2750, "fatigue_load_limit_kN": 232, "max_rpm": 1700, "reference_speed_rpm": 1300, "limiting_speed_rpm": 1700, "weight_g": 67500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 23144-cck-w33 denotes the tapered-bore version (K suffix, taper 1:12) of the 23100-series spherical roller bearing: dimensioned 220×370×120 mm, it seats on an adapter or withdrawal sleeve rather than directly on a machined journal. Numbering ties the bearing to its envelope: 23144-cck-w33 means spherical-roller type, dimension series 31, 220 mm bore — which is why the 370×120 mm outline swaps dimensionally with other ISO 15 bearings of the same code. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. With C 1888 kN and C0 2750 kN, the 23144-cck-w33 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. After drive-up, re-check radial clearance and then swing the outer ring through its self-aligning range: the sphered raceway of the 23144-cck-w33 must still tilt ≈ 0.5–2.5° freely — a joint that binds after sleeve mounting signals excessive drive-up or a cocked sleeve.", "applications": [ "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "fan and pulley shafts that need periodic bearing removal in the field", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "At 220 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23100-series series at 220 mm bore (370×120 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23144-cck-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "The 23144-cck-w33 and its cylindrical-bore counterpart 23144-cc-w33 share envelope and load ratings (1888/2750 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "The 23144-cck-w33 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 1888/2750 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The 1888/2750 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23144 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23144-cck-w33?", "a": "The SKF 23144 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 220 mm nominal bore, 370 mm outer diameter and 120 mm width (8.661 × 14.567 × 4.724 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1888 kN, C0 2750 kN, Pu 232 kN, reference speed 1,300 r/min, limiting speed 1,700 r/min, mass about 67500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23144-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23144-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 220 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23144-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23144-cck-w33 and 23144-cc-w33?", "a": "They share the ISO 15 envelope and the same 1888/2750 kN ratings, but 23144-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23144-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23144", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23144; identical ISO 15 envelope, fits OH3144 adapter sleeve on a 200 mm shaft." }, { "equiv_sku": "C3144", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3144 shares the 220×370×120 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C3144-K", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3144 K shares the 220×370×120 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23144-CCK-W33", "SKF 23144 CCK/W33", "23144 K" ], "locale_variants": {} }, { "sku": "23244-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23244 CCK/W33", "series": "23200-series", "type": "spherical_roller", "d_mm": 220, "D_mm": 400, "B_mm": 144, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2485, "static_load_kN": 3450, "fatigue_load_limit_kN": 285, "max_rpm": 1500, "reference_speed_rpm": 1100, "limiting_speed_rpm": 1500, "weight_g": 96500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF lists SKF 23244 CCK/W33 as the adapter-sleeve execution in the 23200-series range: a 220 mm nominal-bore spherical roller bearing whose 1:12 tapered inner ring is driven up a sleeve, with 400 mm OD and 144 mm width to the ISO 15 envelope. On the SKF nameplate, 23244-cck-w33 follows the ISO 15 convention: 2 for the spherical roller type, 32 for the dimension series 32 (medium OD, extra wide), final digits 44 for the 220 mm bore. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. Speed planning uses two different ceilings: 1,100 r/min thermal reference and 1,500 r/min mechanical limiting speed. For shafts with a locating shoulder, use an AH withdrawal sleeve instead of an adapter sleeve: the bearing presses against the shoulder and the sleeve is drawn out for dismounting, making the 23244-cck-w33 removable without an induction heater.", "applications": [ "large mining crusher main shafts", "wind-turbine main shaft support", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "At 220 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23200-series series at 220 mm bore (400×144 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 144 mm width changes abutment spacing, even though the 400 mm OD matches.", "The 23244-cck-w33 and its cylindrical-bore counterpart 23244-cc-w33 share envelope and load ratings (2485/3450 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23244-cck-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 2485/3450 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23244 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23244-cck-w33?", "a": "The SKF 23244 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 220 mm nominal bore, 400 mm outer diameter and 144 mm width (8.661 × 15.748 × 5.669 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 2485 kN, C0 3450 kN, Pu 285 kN, reference speed 1,100 r/min, limiting speed 1,500 r/min, mass about 96500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23244-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23244-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 220 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23244-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23244-cck-w33 and 23244-cc-w33?", "a": "They share the ISO 15 envelope and the same 2485/3450 kN ratings, but 23244-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23244-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23244", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23244; identical ISO 15 envelope, fits OH2344 adapter sleeve on a 200 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23244-CCK-W33", "SKF 23244 CCK/W33", "23244 K" ], "locale_variants": {} }, { "sku": "23948-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23948 CCK/W33", "series": "23900-series", "type": "spherical_roller", "d_mm": 240, "D_mm": 320, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 685, "static_load_kN": 1160, "fatigue_load_limit_kN": 98, "max_rpm": 2000, "reference_speed_rpm": 1900, "limiting_speed_rpm": 2000, "weight_g": 24500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF lists SKF 23948 CCK/W33 as the adapter-sleeve execution in the 23900-series range: a 240 mm nominal-bore spherical roller bearing whose 1:12 tapered inner ring is driven up a sleeve, with 320 mm OD and 60 mm width to the ISO 15 envelope. Numbering ties the bearing to its envelope: 23948-cck-w33 means spherical-roller type, dimension series 39, 240 mm bore — which is why the 320×60 mm outline swaps dimensionally with other ISO 15 bearings of the same code. Reading the suffix on 23948-cck-w33, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 23948-cc-w33. With C 685 kN and C0 1160 kN, the 23948-cck-w33 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. Because driving up the 1:12 taper consumes radial clearance, K executions are commonly ordered with C3 initial clearance so the residual running clearance after mounting matches the cylindrical-bore 23948-cc-w33 on an interference seat.", "applications": [ "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat", "split-housing plummer block arrangements with bearings swapped in situ" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "smearing on the roller-raceway contact during skid starts below the minimum load" ], "pitfalls": [ "At 240 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23900-series series at 240 mm bore (320×60 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "The 23948-cck-w33 and its cylindrical-bore counterpart 23948-cc-w33 share envelope and load ratings (685/1160 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "The 23948-cck-w33 and its cylindrical-bore counterpart 23948-cc-w33 share envelope and load ratings (685/1160 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23948-cck-w33; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 685/1160 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23948 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23948-cck-w33?", "a": "The SKF 23948 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 240 mm nominal bore, 320 mm outer diameter and 60 mm width (9.449 × 12.598 × 2.362 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 685 kN, C0 1160 kN, Pu 98 kN, reference speed 1,900 r/min, limiting speed 2,000 r/min, mass about 24500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23948-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23948-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 240 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23948-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23948-cck-w33 and 23948-cc-w33?", "a": "They share the ISO 15 envelope and the same 685/1160 kN ratings, but 23948-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23948-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23948", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23948; identical ISO 15 envelope, fits OH3948 adapter sleeve on a 220 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23948-CCK-W33", "SKF 23948 CCK/W33", "23948 K" ], "locale_variants": {} }, { "sku": "23048-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23048 CCK/W33", "series": "23000-series", "type": "spherical_roller", "d_mm": 240, "D_mm": 360, "B_mm": 92, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1340, "static_load_kN": 2080, "fatigue_load_limit_kN": 176, "max_rpm": 1900, "reference_speed_rpm": 1500, "limiting_speed_rpm": 1900, "weight_g": 44500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 23048-cck-w33 denotes the tapered-bore version (K suffix, taper 1:12) of the 23000-series spherical roller bearing: dimensioned 240×360×92 mm, it seats on an adapter or withdrawal sleeve rather than directly on a machined journal. Reading the designation: the leading 2 marks a spherical roller bearing, the 30 is the ISO 15 dimension series (dimension series 30 (slim OD, extra-wide)), and the last two digits encode the 240 mm bore; the 360 mm OD and 92 mm width follow the ISO 15 general plan. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. Catalogue mass 44500 g for the 240×360×92 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. After drive-up, re-check radial clearance and then swing the outer ring through its self-aligning range: the sphered raceway of the 23048-cck-w33 must still tilt ≈ 0.5–2.5° freely — a joint that binds after sleeve mounting signals excessive drive-up or a cocked sleeve.", "applications": [ "large dredger and marine winch drums", "steel-plant continuous-caster segments", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder", "fan and pulley shafts that need periodic bearing removal in the field" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "At 240 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23000-series series at 240 mm bore (360×92 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "The adapter sleeve is selected by actual shaft diameter, not by the 240 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23048-cck-w33 with different sleeves.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 92 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23048-cck-w33; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 1340/2080 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23048 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23048-cck-w33?", "a": "The SKF 23048 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 240 mm nominal bore, 360 mm outer diameter and 92 mm width (9.449 × 14.173 × 3.622 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1340 kN, C0 2080 kN, Pu 176 kN, reference speed 1,500 r/min, limiting speed 1,900 r/min, mass about 44500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23048-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23048-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 240 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23048-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23048-cck-w33 and 23048-cc-w33?", "a": "They share the ISO 15 envelope and the same 1340/2080 kN ratings, but 23048-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23048-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23048", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23048; identical ISO 15 envelope, fits OH3048 adapter sleeve on a 220 mm shaft." }, { "equiv_sku": "C3048", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3048 shares the 240×360×92 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C3048-K", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3048 K shares the 240×360×92 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23048-CCK-W33", "SKF 23048 CCK/W33", "23048 K" ], "locale_variants": {} }, { "sku": "23148-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23148 CCK/W33", "series": "23100-series", "type": "spherical_roller", "d_mm": 240, "D_mm": 400, "B_mm": 128, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2187, "static_load_kN": 3200, "fatigue_load_limit_kN": 255, "max_rpm": 1600, "reference_speed_rpm": 1200, "limiting_speed_rpm": 1600, "weight_g": 80500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF lists SKF 23148 CCK/W33 as the adapter-sleeve execution in the 23100-series range: a 240 mm nominal-bore spherical roller bearing whose 1:12 tapered inner ring is driven up a sleeve, with 400 mm OD and 128 mm width to the ISO 15 envelope. Digit by digit, 23148-cck-w33 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 31, and bore reference 48 resolving to 240 mm; 400 mm OD and 128 mm width are the matching ISO 15 boundary values. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. The 80.0 mm radial section height ((400−240)/2) and 80500 g catalogue mass frame a 240 mm bore bearing rated at 2187 kN C — roughly 9.11 kN of dynamic capacity per millimetre of bore before application factors. For shafts with a locating shoulder, use an AH withdrawal sleeve instead of an adapter sleeve: the bearing presses against the shoulder and the sleeve is drawn out for dismounting, making the 23148-cck-w33 removable without an induction heater.", "applications": [ "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "At 240 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23100-series series at 240 mm bore (400×128 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23148-cck-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "The 23148-cck-w33 and its cylindrical-bore counterpart 23148-cc-w33 share envelope and load ratings (2187/3200 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "The 23148-cck-w33 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 2187/3200 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The 2187/3200 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23148 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23148-cck-w33?", "a": "The SKF 23148 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 240 mm nominal bore, 400 mm outer diameter and 128 mm width (9.449 × 15.748 × 5.039 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 2187 kN, C0 3200 kN, Pu 255 kN, reference speed 1,200 r/min, limiting speed 1,600 r/min, mass about 80500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23148-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23148-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 240 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23148-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23148-cck-w33 and 23148-cc-w33?", "a": "They share the ISO 15 envelope and the same 2187/3200 kN ratings, but 23148-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23148-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23148", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23148; identical ISO 15 envelope, fits OH3148 adapter sleeve on a 220 mm shaft." }, { "equiv_sku": "C3148", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3148 shares the 240×400×128 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C3148-K", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3148 K shares the 240×400×128 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23148-CCK-W33", "SKF 23148 CCK/W33", "23148 K" ], "locale_variants": {} }, { "sku": "23248-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23248 CCK/W33", "series": "23200-series", "type": "spherical_roller", "d_mm": 240, "D_mm": 440, "B_mm": 160, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 3042, "static_load_kN": 4300, "fatigue_load_limit_kN": 345, "max_rpm": 1300, "reference_speed_rpm": 950, "limiting_speed_rpm": 1300, "weight_g": 125000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For sleeve mounting on a 240 mm shaft, SKF order number SKF 23248 CCK/W33 is the 1:12 tapered-bore spherical roller bearing in the 23200-series family (dimension series 32 (medium OD, extra wide)); the cylindrical-bore equivalent is a separate order number, 23248-cc-w33. Numbering ties the bearing to its envelope: 23248-cck-w33 means spherical-roller type, dimension series 32, 240 mm bore — which is why the 440×160 mm outline swaps dimensionally with other ISO 15 bearings of the same code. The K in the designation marks the 1:12 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. Speed planning uses two different ceilings: 950 r/min thermal reference and 1,300 r/min mechanical limiting speed. Over-driving the 23248-cck-w33 up its sleeve pinches radial clearance below the residual minimum and can crack the inner ring in service; under-driving leaves the sleeve seat loose, so the ring creeps and frets the sleeve — measure, do not estimate.", "applications": [ "large mining crusher main shafts", "wind-turbine main shaft support", "split-housing plummer block arrangements with bearings swapped in situ", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems" ], "pitfalls": [ "At 240 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23200-series series at 240 mm bore (440×160 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 160 mm width changes abutment spacing, even though the 440 mm OD matches.", "The 23248-cck-w33 and its cylindrical-bore counterpart 23248-cc-w33 share envelope and load ratings (3042/4300 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "The adapter sleeve is selected by actual shaft diameter, not by the 240 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23248-cck-w33 with different sleeves.", "The 125000 g mass and 160 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23248-cck-w33.", "The 3042/4300 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23248 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23248-cck-w33?", "a": "The SKF 23248 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 240 mm nominal bore, 440 mm outer diameter and 160 mm width (9.449 × 17.323 × 6.299 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 3042 kN, C0 4300 kN, Pu 345 kN, reference speed 950 r/min, limiting speed 1,300 r/min, mass about 125000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23248-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23248-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 240 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23248-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23248-cck-w33 and 23248-cc-w33?", "a": "They share the ISO 15 envelope and the same 3042/4300 kN ratings, but 23248-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23248-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23248", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23248; identical ISO 15 envelope, fits OH2348 adapter sleeve on a 220 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23248-CCK-W33", "SKF 23248 CCK/W33", "23248 K" ], "locale_variants": {} }, { "sku": "23952-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23952 CCK/W33", "series": "23900-series", "type": "spherical_roller", "d_mm": 260, "D_mm": 360, "B_mm": 75, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1055, "static_load_kN": 1800, "fatigue_load_limit_kN": 156, "max_rpm": 1900, "reference_speed_rpm": 1700, "limiting_speed_rpm": 1900, "weight_g": 35000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "23952-cck-w33 is the 1:12 tapered-bore execution of the 23900-series spherical roller bearing: the same two barrel-roller rows on a sphered outer raceway as 23952-cc-w33, but the inner-ring bore tapers 1 mm per 12 mm for adapter- or withdrawal-sleeve mounting, as listed by SKF in SKF catalogue PUB BU/P1 17000. Reading the designation: the leading 2 marks a spherical roller bearing, the 39 is the ISO 15 dimension series (dimension series 39 (compact OD, narrow)), and the last two digits encode the 260 mm bore; the 360 mm OD and 75 mm width follow the ISO 15 general plan. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. At 1,700 r/min reference speed the 50.0 mm-section 23952-cck-w33 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 1,900 r/min as the mechanical ceiling. Because driving up the 1:12 taper consumes radial clearance, K executions are commonly ordered with C3 initial clearance so the residual running clearance after mounting matches the cylindrical-bore 23952-cc-w33 on an interference seat.", "applications": [ "large induced-draft fan rotors", "SAG and ball-mill drive shafts", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "At 260 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23900-series series at 260 mm bore (360×75 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "The adapter sleeve is selected by actual shaft diameter, not by the 260 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23952-cck-w33 with different sleeves.", "The adapter sleeve is selected by actual shaft diameter, not by the 260 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23952-cck-w33 with different sleeves.", "Shaft and housing fillets must clear the bearing chamfer so the 75 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 1055/1800 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23952 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23952-cck-w33?", "a": "The SKF 23952 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 260 mm nominal bore, 360 mm outer diameter and 75 mm width (10.236 × 14.173 × 2.953 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1055 kN, C0 1800 kN, Pu 156 kN, reference speed 1,700 r/min, limiting speed 1,900 r/min, mass about 35000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23952-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23952-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 260 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23952-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23952-cck-w33 and 23952-cc-w33?", "a": "They share the ISO 15 envelope and the same 1055/1800 kN ratings, but 23952-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23952-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23952", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23952; identical ISO 15 envelope, fits OH3952 adapter sleeve on a 240 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23952-CCK-W33", "SKF 23952 CCK/W33", "23952 K" ], "locale_variants": {} }, { "sku": "23052-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23052 CCK/W33", "series": "23000-series", "type": "spherical_roller", "d_mm": 260, "D_mm": 400, "B_mm": 104, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1675, "static_load_kN": 2550, "fatigue_load_limit_kN": 212, "max_rpm": 1700, "reference_speed_rpm": 1300, "limiting_speed_rpm": 1700, "weight_g": 60500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF 23052 CCK/W33 in SKF catalogue PUB BU/P1 17000 is a double-row spherical roller bearing with a tapered bore (1:12), intended for an H-series adapter sleeve or AH withdrawal sleeve, with two pressed-steel cages with a floating guide ring and the same 260×400×104 mm ISO 15 outline as its cylindrical-bore counterpart. On the SKF nameplate, 23052-cck-w33 follows the ISO 15 convention: 2 for the spherical roller type, 30 for the dimension series 30 (slim OD, extra-wide), final digits 52 for the 260 mm bore. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. At 1,300 r/min reference speed the 70.0 mm-section 23052-cck-w33 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 1,700 r/min as the mechanical ceiling. At 260 mm bore, dismount after service is by KM locknut reversal or a hydraulic nut on larger sizes; oil-injection grooves on the bigger sleeves let pressurised oil float the 23052-cck-w33 off the taper without scoring either surface.", "applications": [ "large induced-draft fan rotors", "SAG and ball-mill drive shafts", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat", "split-housing plummer block arrangements with bearings swapped in situ" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "At 260 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23000-series series at 260 mm bore (400×104 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "The 23052-cck-w33 and its cylindrical-bore counterpart 23052-cc-w33 share envelope and load ratings (1675/2550 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "The 23052-cck-w33 and its cylindrical-bore counterpart 23052-cc-w33 share envelope and load ratings (1675/2550 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23052-cck-w33; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 1675/2550 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23052 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23052-cck-w33?", "a": "The SKF 23052 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 260 mm nominal bore, 400 mm outer diameter and 104 mm width (10.236 × 15.748 × 4.094 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1675 kN, C0 2550 kN, Pu 212 kN, reference speed 1,300 r/min, limiting speed 1,700 r/min, mass about 60500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23052-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23052-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 260 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23052-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23052-cck-w33 and 23052-cc-w33?", "a": "They share the ISO 15 envelope and the same 1675/2550 kN ratings, but 23052-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23052-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23052", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23052; identical ISO 15 envelope, fits OH3052 adapter sleeve on a 240 mm shaft." }, { "equiv_sku": "C3052", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 3052 shares the 260×400×104 mm envelope but catalogue C/C0 differ (1760/2850 kN vs 1675/2550 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C3052-K", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 3052 K shares the 260×400×104 mm envelope but catalogue C/C0 differ (1760/2850 kN vs 1675/2550 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23052-CCK-W33", "SKF 23052 CCK/W33", "23052 K" ], "locale_variants": {} }, { "sku": "23152-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23152 CCK/W33", "series": "23100-series", "type": "spherical_roller", "d_mm": 260, "D_mm": 440, "B_mm": 144, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2664, "static_load_kN": 3900, "fatigue_load_limit_kN": 290, "max_rpm": 1400, "reference_speed_rpm": 1100, "limiting_speed_rpm": 1400, "weight_g": 109000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "23152-cck-w33 is the 1:12 tapered-bore execution of the 23100-series spherical roller bearing: the same two barrel-roller rows on a sphered outer raceway as 23152-cc-w33, but the inner-ring bore tapers 1 mm per 12 mm for adapter- or withdrawal-sleeve mounting, as listed by SKF in SKF catalogue PUB BU/P1 17000. The code breaks down as type digit 2 (double-row spherical roller), dimension series 31 (dimension series 31 (medium OD, wide)), and bore code 52 = 260 mm; dimensions 260×440×144 mm therefore match the ISO 15 envelope. The K in the designation marks the 1:12 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. The 290 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.46 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. For shafts with a locating shoulder, use an AH withdrawal sleeve instead of an adapter sleeve: the bearing presses against the shoulder and the sleeve is drawn out for dismounting, making the 23152-cck-w33 removable without an induction heater.", "applications": [ "steel-plant continuous-caster segments", "large induced-draft fan rotors", "fan and pulley shafts that need periodic bearing removal in the field", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems" ], "pitfalls": [ "At 260 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23100-series series at 260 mm bore (440×144 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 144 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "The adapter sleeve is selected by actual shaft diameter, not by the 260 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23152-cck-w33 with different sleeves.", "Catalogue reference speed and limiting speed are different limits: the 1,100 r/min reference is a thermal criterion under load, while the 1,400 r/min limiting value is the mechanical ceiling — observe both.", "The 2664/3900 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23152 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23152-cck-w33?", "a": "The SKF 23152 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 260 mm nominal bore, 440 mm outer diameter and 144 mm width (10.236 × 17.323 × 5.669 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 2664 kN, C0 3900 kN, Pu 290 kN, reference speed 1,100 r/min, limiting speed 1,400 r/min, mass about 109000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23152-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23152-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 260 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23152-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23152-cck-w33 and 23152-cc-w33?", "a": "They share the ISO 15 envelope and the same 2664/3900 kN ratings, but 23152-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23152-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23152", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23152; identical ISO 15 envelope, fits OH3152 adapter sleeve on a 240 mm shaft." }, { "equiv_sku": "C3152", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3152 shares the 260×440×144 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C3152-K", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3152 K shares the 260×440×144 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23152-CCK-W33", "SKF 23152 CCK/W33", "23152 K" ], "locale_variants": {} }, { "sku": "23252-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23252 CCK/W33", "series": "23200-series", "type": "spherical_roller", "d_mm": 260, "D_mm": 480, "B_mm": 174, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 3395, "static_load_kN": 4750, "fatigue_load_limit_kN": 360, "max_rpm": 1200, "reference_speed_rpm": 850, "limiting_speed_rpm": 1200, "weight_g": 160000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The SKF 23252 CCK/W33 is a 260×480×174 mm spherical roller bearing with a 1:12 tapered bore — SKF catalogue execution for sleeve mounting on a 260 mm plain shaft, retaining the double-row self-aligning barrel-roller design. Reading the designation: the leading 2 marks a spherical roller bearing, the 32 is the ISO 15 dimension series (dimension series 32 (medium OD, extra wide)), and the last two digits encode the 260 mm bore; the 480 mm OD and 174 mm width follow the ISO 15 general plan. The K in the designation marks the 1:12 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. With C 3395 kN and C0 4750 kN, the 23252-cck-w33 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. On an H adapter sleeve the 260 mm shaft seat only needs an h9 plain journal; slide the sleeve into the 23252-cck-w33 inner ring, tighten the KM nut against the MB washer until the catalogue clearance-reduction value is reached, then lock the washer tab.", "applications": [ "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems" ], "pitfalls": [ "At 260 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23200-series series at 260 mm bore (480×174 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 174 mm width changes abutment spacing, even though the 480 mm OD matches.", "The adapter sleeve is selected by actual shaft diameter, not by the 260 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23252-cck-w33 with different sleeves.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 174 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "The 160000 g mass and 174 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23252-cck-w33.", "The 3395/4750 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23252 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23252-cck-w33?", "a": "The SKF 23252 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 260 mm nominal bore, 480 mm outer diameter and 174 mm width (10.236 × 18.898 × 6.85 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 3395 kN, C0 4750 kN, Pu 360 kN, reference speed 850 r/min, limiting speed 1,200 r/min, mass about 160000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23252-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23252-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 260 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23252-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23252-cck-w33 and 23252-cc-w33?", "a": "They share the ISO 15 envelope and the same 3395/4750 kN ratings, but 23252-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23252-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23252", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23252; identical ISO 15 envelope, fits OH2352 adapter sleeve on a 240 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23252-CCK-W33", "SKF 23252 CCK/W33", "23252 K" ], "locale_variants": {} }, { "sku": "23956-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23956 CCK/W33", "series": "23900-series", "type": "spherical_roller", "d_mm": 280, "D_mm": 380, "B_mm": 75, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1016, "static_load_kN": 1760, "fatigue_load_limit_kN": 143, "max_rpm": 1700, "reference_speed_rpm": 1600, "limiting_speed_rpm": 1700, "weight_g": 40000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The SKF 23956 CCK/W33 is a 280×380×75 mm spherical roller bearing with a 1:12 tapered bore — SKF catalogue execution for sleeve mounting on a 280 mm plain shaft, retaining the double-row self-aligning barrel-roller design. The code breaks down as type digit 2 (double-row spherical roller), dimension series 39 (dimension series 39 (compact OD, narrow)), and bore code 56 = 280 mm; dimensions 280×380×75 mm therefore match the ISO 15 envelope. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. The 143 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.73 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. At 280 mm bore, dismount after service is by KM locknut reversal or a hydraulic nut on larger sizes; oil-injection grooves on the bigger sleeves let pressurised oil float the 23956-cck-w33 off the taper without scoring either surface.", "applications": [ "steel-plant continuous-caster segments", "large induced-draft fan rotors", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat", "split-housing plummer block arrangements with bearings swapped in situ" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "At 280 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23900-series series at 280 mm bore (380×75 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "The adapter sleeve is selected by actual shaft diameter, not by the 280 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23956-cck-w33 with different sleeves.", "The adapter sleeve is selected by actual shaft diameter, not by the 280 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23956-cck-w33 with different sleeves.", "Shaft and housing fillets must clear the bearing chamfer so the 75 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 1016/1760 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23956 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23956-cck-w33?", "a": "The SKF 23956 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 280 mm nominal bore, 380 mm outer diameter and 75 mm width (11.024 × 14.961 × 2.953 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1016 kN, C0 1760 kN, Pu 143 kN, reference speed 1,600 r/min, limiting speed 1,700 r/min, mass about 40000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23956-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23956-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 280 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23956-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23956-cck-w33 and 23956-cc-w33?", "a": "They share the ISO 15 envelope and the same 1016/1760 kN ratings, but 23956-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23956-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23956", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23956; identical ISO 15 envelope, fits OH3956 adapter sleeve on a 260 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23956-CCK-W33", "SKF 23956 CCK/W33", "23956 K" ], "locale_variants": {} }, { "sku": "23056-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23056 CCK/W33", "series": "23000-series", "type": "spherical_roller", "d_mm": 280, "D_mm": 420, "B_mm": 106, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1797, "static_load_kN": 2850, "fatigue_load_limit_kN": 224, "max_rpm": 1600, "reference_speed_rpm": 1300, "limiting_speed_rpm": 1600, "weight_g": 67000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "23056-cck-w33 is the 1:12 tapered-bore execution of the 23000-series spherical roller bearing: the same two barrel-roller rows on a sphered outer raceway as 23056-cc-w33, but the inner-ring bore tapers 1 mm per 12 mm for adapter- or withdrawal-sleeve mounting, as listed by SKF in SKF catalogue PUB BU/P1 17000. Numbering ties the bearing to its envelope: 23056-cck-w33 means spherical-roller type, dimension series 30, 280 mm bore — which is why the 420×106 mm outline swaps dimensionally with other ISO 15 bearings of the same code. The K in the designation marks the 1:12 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. The 224 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.59 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. Over-driving the 23056-cck-w33 up its sleeve pinches radial clearance below the residual minimum and can crack the inner ring in service; under-driving leaves the sleeve seat loose, so the ring creeps and frets the sleeve — measure, do not estimate.", "applications": [ "steel-plant continuous-caster segments", "large induced-draft fan rotors", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 280 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23000-series series at 280 mm bore (420×106 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "The 23056-cck-w33 and its cylindrical-bore counterpart 23056-cc-w33 share envelope and load ratings (1797/2850 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "The 23056-cck-w33 and its cylindrical-bore counterpart 23056-cc-w33 share envelope and load ratings (1797/2850 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23056-cck-w33; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 1797/2850 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23056 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23056-cck-w33?", "a": "The SKF 23056 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 280 mm nominal bore, 420 mm outer diameter and 106 mm width (11.024 × 16.535 × 4.173 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1797 kN, C0 2850 kN, Pu 224 kN, reference speed 1,300 r/min, limiting speed 1,600 r/min, mass about 67000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23056-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23056-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 280 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23056-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23056-cck-w33 and 23056-cc-w33?", "a": "They share the ISO 15 envelope and the same 1797/2850 kN ratings, but 23056-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23056-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23056", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23056; identical ISO 15 envelope, fits OH3056 adapter sleeve on a 260 mm shaft." }, { "equiv_sku": "C3056", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3056 shares the 280×420×106 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C3056-K", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3056 K shares the 280×420×106 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23056-CCK-W33", "SKF 23056 CCK/W33", "23056 K" ], "locale_variants": {} }, { "sku": "23156-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23156 CCK/W33", "series": "23100-series", "type": "spherical_roller", "d_mm": 280, "D_mm": 460, "B_mm": 146, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2784, "static_load_kN": 4250, "fatigue_load_limit_kN": 335, "max_rpm": 1300, "reference_speed_rpm": 1000, "limiting_speed_rpm": 1300, "weight_g": 115000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The SKF 23156 CCK/W33 is a 280×460×146 mm spherical roller bearing with a 1:12 tapered bore — SKF catalogue execution for sleeve mounting on a 280 mm plain shaft, retaining the double-row self-aligning barrel-roller design. On the SKF nameplate, 23156-cck-w33 follows the ISO 15 convention: 2 for the spherical roller type, 31 for the dimension series 31 (medium OD, wide), final digits 56 for the 280 mm bore. Reading the suffix on 23156-cck-w33, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 23156-cc-w33. Catalogue mass 115000 g for the 280×460×146 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. On an H adapter sleeve the 280 mm shaft seat only needs an h9 plain journal; slide the sleeve into the 23156-cck-w33 inner ring, tighten the KM nut against the MB washer until the catalogue clearance-reduction value is reached, then lock the washer tab.", "applications": [ "large dredger and marine winch drums", "steel-plant continuous-caster segments", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "At 280 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23100-series series at 280 mm bore (460×146 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 146 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "The adapter sleeve is selected by actual shaft diameter, not by the 280 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23156-cck-w33 with different sleeves.", "Catalogue reference speed and limiting speed are different limits: the 1,000 r/min reference is a thermal criterion under load, while the 1,300 r/min limiting value is the mechanical ceiling — observe both.", "The 2784/4250 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23156 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23156-cck-w33?", "a": "The SKF 23156 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 280 mm nominal bore, 460 mm outer diameter and 146 mm width (11.024 × 18.11 × 5.748 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 2784 kN, C0 4250 kN, Pu 335 kN, reference speed 1,000 r/min, limiting speed 1,300 r/min, mass about 115000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23156-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23156-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 280 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23156-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23156-cck-w33 and 23156-cc-w33?", "a": "They share the ISO 15 envelope and the same 2784/4250 kN ratings, but 23156-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23156-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23156", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23156; identical ISO 15 envelope, fits OH3156 adapter sleeve on a 260 mm shaft." }, { "equiv_sku": "C3156", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3156 shares the 280×460×146 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C3156-K", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3156 K shares the 280×460×146 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23156-CCK-W33", "SKF 23156 CCK/W33", "23156 K" ], "locale_variants": {} }, { "sku": "23256-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23256 CCK/W33", "series": "23200-series", "type": "spherical_roller", "d_mm": 280, "D_mm": 500, "B_mm": 176, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 3425, "static_load_kN": 4900, "fatigue_load_limit_kN": 365, "max_rpm": 1100, "reference_speed_rpm": 800, "limiting_speed_rpm": 1100, "weight_g": 165000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 23256-cck-w33 denotes the tapered-bore version (K suffix, taper 1:12) of the 23200-series spherical roller bearing: dimensioned 280×500×176 mm, it seats on an adapter or withdrawal sleeve rather than directly on a machined journal. The code breaks down as type digit 2 (double-row spherical roller), dimension series 32 (dimension series 32 (medium OD, extra wide)), and bore code 56 = 280 mm; dimensions 280×500×176 mm therefore match the ISO 15 envelope. Reading the suffix on 23256-cck-w33, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 23256-cc-w33. The 110.0 mm radial section height ((500−280)/2) and 165000 g catalogue mass frame a 280 mm bore bearing rated at 3425 kN C — roughly 12.23 kN of dynamic capacity per millimetre of bore before application factors. Because driving up the 1:12 taper consumes radial clearance, K executions are commonly ordered with C3 initial clearance so the residual running clearance after mounting matches the cylindrical-bore 23256-cc-w33 on an interference seat.", "applications": [ "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat", "split-housing plummer block arrangements with bearings swapped in situ" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "At 280 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23200-series series at 280 mm bore (500×176 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 176 mm width changes abutment spacing, even though the 500 mm OD matches.", "The adapter sleeve is selected by actual shaft diameter, not by the 280 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23256-cck-w33 with different sleeves.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 176 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "The 165000 g mass and 176 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23256-cck-w33.", "The 3425/4900 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23256 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23256-cck-w33?", "a": "The SKF 23256 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 280 mm nominal bore, 500 mm outer diameter and 176 mm width (11.024 × 19.685 × 6.929 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 3425 kN, C0 4900 kN, Pu 365 kN, reference speed 800 r/min, limiting speed 1,100 r/min, mass about 165000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23256-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23256-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 280 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23256-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23256-cck-w33 and 23256-cc-w33?", "a": "They share the ISO 15 envelope and the same 3425/4900 kN ratings, but 23256-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23256-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23256", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23256; identical ISO 15 envelope, fits OH2356 adapter sleeve on a 260 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23256-CCK-W33", "SKF 23256 CCK/W33", "23256 K" ], "locale_variants": {} }, { "sku": "23960-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23960 CCK/W33", "series": "23900-series", "type": "spherical_roller", "d_mm": 300, "D_mm": 420, "B_mm": 90, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1413, "static_load_kN": 2500, "fatigue_load_limit_kN": 200, "max_rpm": 1600, "reference_speed_rpm": 1400, "limiting_speed_rpm": 1600, "weight_g": 58500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For sleeve mounting on a 300 mm shaft, SKF order number SKF 23960 CCK/W33 is the 1:12 tapered-bore spherical roller bearing in the 23900-series family (dimension series 39 (compact OD, narrow)); the cylindrical-bore equivalent is a separate order number, 23960-cc-w33. Numbering ties the bearing to its envelope: 23960-cck-w33 means spherical-roller type, dimension series 39, 300 mm bore — which is why the 420×90 mm outline swaps dimensionally with other ISO 15 bearings of the same code. The K in the designation marks the 1:12 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. Speed planning uses two different ceilings: 1,400 r/min thermal reference and 1,600 r/min mechanical limiting speed. At 300 mm bore, dismount after service is by KM locknut reversal or a hydraulic nut on larger sizes; oil-injection grooves on the bigger sleeves let pressurised oil float the 23960-cck-w33 off the taper without scoring either surface.", "applications": [ "large mining crusher main shafts", "wind-turbine main shaft support", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems" ], "pitfalls": [ "At 300 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23900-series series at 300 mm bore (420×90 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "The 23960-cck-w33 and its cylindrical-bore counterpart 23960-cc-w33 share envelope and load ratings (1413/2500 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "The 23960-cck-w33 and its cylindrical-bore counterpart 23960-cc-w33 share envelope and load ratings (1413/2500 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23960-cck-w33 pits long before its L10 life.", "The 1413/2500 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23960 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23960-cck-w33?", "a": "The SKF 23960 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 300 mm nominal bore, 420 mm outer diameter and 90 mm width (11.811 × 16.535 × 3.543 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1413 kN, C0 2500 kN, Pu 200 kN, reference speed 1,400 r/min, limiting speed 1,600 r/min, mass about 58500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23960-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23960-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 300 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23960-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23960-cck-w33 and 23960-cc-w33?", "a": "They share the ISO 15 envelope and the same 1413/2500 kN ratings, but 23960-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23960-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23960", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23960; identical ISO 15 envelope, fits OH3960 adapter sleeve on a 280 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23960-CCK-W33", "SKF 23960 CCK/W33", "23960 K" ], "locale_variants": {} }, { "sku": "23060-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23060 CCK/W33", "series": "23000-series", "type": "spherical_roller", "d_mm": 300, "D_mm": 460, "B_mm": 118, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2219, "static_load_kN": 3450, "fatigue_load_limit_kN": 265, "max_rpm": 1500, "reference_speed_rpm": 1200, "limiting_speed_rpm": 1500, "weight_g": 90000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF lists SKF 23060 CCK/W33 as the adapter-sleeve execution in the 23000-series range: a 300 mm nominal-bore spherical roller bearing whose 1:12 tapered inner ring is driven up a sleeve, with 460 mm OD and 118 mm width to the ISO 15 envelope. Reading the designation: the leading 2 marks a spherical roller bearing, the 30 is the ISO 15 dimension series (dimension series 30 (slim OD, extra-wide)), and the last two digits encode the 300 mm bore; the 460 mm OD and 118 mm width follow the ISO 15 general plan. Reading the suffix on 23060-cck-w33, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 23060-cc-w33. Speed planning uses two different ceilings: 1,200 r/min thermal reference and 1,500 r/min mechanical limiting speed. Over-driving the 23060-cck-w33 up its sleeve pinches radial clearance below the residual minimum and can crack the inner ring in service; under-driving leaves the sleeve seat loose, so the ring creeps and frets the sleeve — measure, do not estimate.", "applications": [ "large mining crusher main shafts", "wind-turbine main shaft support", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat", "split-housing plummer block arrangements with bearings swapped in situ" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "At 300 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23000-series series at 300 mm bore (460×118 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "The adapter sleeve is selected by actual shaft diameter, not by the 300 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23060-cck-w33 with different sleeves.", "The adapter sleeve is selected by actual shaft diameter, not by the 300 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23060-cck-w33 with different sleeves.", "Shaft and housing fillets must clear the bearing chamfer so the 118 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 2219/3450 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23060 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23060-cck-w33?", "a": "The SKF 23060 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 300 mm nominal bore, 460 mm outer diameter and 118 mm width (11.811 × 18.11 × 4.646 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 2219 kN, C0 3450 kN, Pu 265 kN, reference speed 1,200 r/min, limiting speed 1,500 r/min, mass about 90000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23060-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23060-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 300 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23060-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23060-cck-w33 and 23060-cc-w33?", "a": "They share the ISO 15 envelope and the same 2219/3450 kN ratings, but 23060-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23060-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23060", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23060; identical ISO 15 envelope, fits OH3060 adapter sleeve on a 280 mm shaft." }, { "equiv_sku": "C3060-M", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3060 M shares the 300×460×118 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C3060-KM", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3060 KM shares the 300×460×118 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23060-CCK-W33", "SKF 23060 CCK/W33", "23060 K" ], "locale_variants": {} }, { "sku": "23160-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23160 CCK/W33", "series": "23100-series", "type": "spherical_roller", "d_mm": 300, "D_mm": 500, "B_mm": 160, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 3368, "static_load_kN": 5100, "fatigue_load_limit_kN": 380, "max_rpm": 1200, "reference_speed_rpm": 950, "limiting_speed_rpm": 1200, "weight_g": 150000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For sleeve mounting on a 300 mm shaft, SKF order number SKF 23160 CCK/W33 is the 1:12 tapered-bore spherical roller bearing in the 23100-series family (dimension series 31 (medium OD, wide)); the cylindrical-bore equivalent is a separate order number, 23160-cc-w33. Digit by digit, 23160-cck-w33 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 31, and bore reference 60 resolving to 300 mm; 500 mm OD and 160 mm width are the matching ISO 15 boundary values. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. Selection arithmetic: the C0/C ratio is about 1.51 (static 5100 kN against dynamic 3368 kN), typical of a spherical roller sized for heavy combined loads, and the 380 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. On an H adapter sleeve the 300 mm shaft seat only needs an h9 plain journal; slide the sleeve into the 23160-cck-w33 inner ring, tighten the KM nut against the MB washer until the catalogue clearance-reduction value is reached, then lock the washer tab.", "applications": [ "SAG and ball-mill drive shafts", "large mining crusher main shafts", "fan and pulley shafts that need periodic bearing removal in the field", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still" ], "pitfalls": [ "At 300 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23100-series series at 300 mm bore (500×160 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23160-cck-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "The 23160-cck-w33 and its cylindrical-bore counterpart 23160-cc-w33 share envelope and load ratings (3368/5100 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23160-cck-w33; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 3368/5100 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23160 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23160-cck-w33?", "a": "The SKF 23160 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 300 mm nominal bore, 500 mm outer diameter and 160 mm width (11.811 × 19.685 × 6.299 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 3368 kN, C0 5100 kN, Pu 380 kN, reference speed 950 r/min, limiting speed 1,200 r/min, mass about 150000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23160-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23160-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 300 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23160-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23160-cck-w33 and 23160-cc-w33?", "a": "They share the ISO 15 envelope and the same 3368/5100 kN ratings, but 23160-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23160-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23160", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23160; identical ISO 15 envelope, fits OH3160 adapter sleeve on a 280 mm shaft." }, { "equiv_sku": "C3160", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3160 shares the 300×500×160 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C3160-K", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3160 K shares the 300×500×160 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23160-CCK-W33", "SKF 23160 CCK/W33", "23160 K" ], "locale_variants": {} }, { "sku": "23260-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23260 CCK/W33", "series": "23200-series", "type": "spherical_roller", "d_mm": 300, "D_mm": 540, "B_mm": 192, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4052, "static_load_kN": 5850, "fatigue_load_limit_kN": 425, "max_rpm": 1000, "reference_speed_rpm": 750, "limiting_speed_rpm": 1000, "weight_g": 210000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF 23260 CCK/W33 in SKF catalogue PUB BU/P1 17000 is a double-row spherical roller bearing with a tapered bore (1:12), intended for an H-series adapter sleeve or AH withdrawal sleeve, with two pressed-steel cages with a floating guide ring and the same 300×540×192 mm ISO 15 outline as its cylindrical-bore counterpart. Numbering ties the bearing to its envelope: 23260-cck-w33 means spherical-roller type, dimension series 32, 300 mm bore — which is why the 540×192 mm outline swaps dimensionally with other ISO 15 bearings of the same code. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. The 425 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.44 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. Because driving up the 1:12 taper consumes radial clearance, K executions are commonly ordered with C3 initial clearance so the residual running clearance after mounting matches the cylindrical-bore 23260-cc-w33 on an interference seat.", "applications": [ "steel-plant continuous-caster segments", "large induced-draft fan rotors", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still" ], "pitfalls": [ "At 300 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23200-series series at 300 mm bore (540×192 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 192 mm width changes abutment spacing, even though the 540 mm OD matches.", "The 23260-cck-w33 and its cylindrical-bore counterpart 23260-cc-w33 share envelope and load ratings (4052/5850 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23260-cck-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "The 23260-cck-w33 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 4052/5850 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The 4052/5850 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23260 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23260-cck-w33?", "a": "The SKF 23260 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 300 mm nominal bore, 540 mm outer diameter and 192 mm width (11.811 × 21.26 × 7.559 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 4052 kN, C0 5850 kN, Pu 425 kN, reference speed 750 r/min, limiting speed 1,000 r/min, mass about 210000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23260-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23260-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 300 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23260-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23260-cck-w33 and 23260-cc-w33?", "a": "They share the ISO 15 envelope and the same 4052/5850 kN ratings, but 23260-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23260-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23260", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23260; identical ISO 15 envelope, fits OH3260 adapter sleeve on a 280 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23260-CCK-W33", "SKF 23260 CCK/W33", "23260 K" ], "locale_variants": {} }, { "sku": "23964-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23964 CCK/W33", "series": "23900-series", "type": "spherical_roller", "d_mm": 320, "D_mm": 440, "B_mm": 90, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1480, "static_load_kN": 2700, "fatigue_load_limit_kN": 212, "max_rpm": 1500, "reference_speed_rpm": 1400, "limiting_speed_rpm": 1500, "weight_g": 61000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF 23964 CCK/W33 in SKF catalogue PUB BU/P1 17000 is a double-row spherical roller bearing with a tapered bore (1:12), intended for an H-series adapter sleeve or AH withdrawal sleeve, with two pressed-steel cages with a floating guide ring and the same 320×440×90 mm ISO 15 outline as its cylindrical-bore counterpart. Digit by digit, 23964-cck-w33 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 39, and bore reference 64 resolving to 320 mm; 440 mm OD and 90 mm width are the matching ISO 15 boundary values. Reading the suffix on 23964-cck-w33, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 23964-cc-w33. Selection arithmetic: the C0/C ratio is about 1.82 (static 2700 kN against dynamic 1480 kN), typical of a spherical roller sized for heavy combined loads, and the 212 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Over-driving the 23964-cck-w33 up its sleeve pinches radial clearance below the residual minimum and can crack the inner ring in service; under-driving leaves the sleeve seat loose, so the ring creeps and frets the sleeve — measure, do not estimate.", "applications": [ "SAG and ball-mill drive shafts", "large mining crusher main shafts", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat", "split-housing plummer block arrangements with bearings swapped in situ" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "At 320 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23900-series series at 320 mm bore (440×90 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "The 23964-cck-w33 and its cylindrical-bore counterpart 23964-cc-w33 share envelope and load ratings (1480/2700 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "The 23964-cck-w33 and its cylindrical-bore counterpart 23964-cc-w33 share envelope and load ratings (1480/2700 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23964-cck-w33 pits long before its L10 life.", "The 1480/2700 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23964 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23964-cck-w33?", "a": "The SKF 23964 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 320 mm nominal bore, 440 mm outer diameter and 90 mm width (12.598 × 17.323 × 3.543 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1480 kN, C0 2700 kN, Pu 212 kN, reference speed 1,400 r/min, limiting speed 1,500 r/min, mass about 61000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23964-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23964-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 320 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23964-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23964-cck-w33 and 23964-cc-w33?", "a": "They share the ISO 15 envelope and the same 1480/2700 kN ratings, but 23964-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23964-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23964", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23964; identical ISO 15 envelope, fits OH3964 adapter sleeve on a 300 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23964-CCK-W33", "SKF 23964 CCK/W33", "23964 K" ], "locale_variants": {} }, { "sku": "23064-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23064 CCK/W33", "series": "23000-series", "type": "spherical_roller", "d_mm": 320, "D_mm": 480, "B_mm": 121, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2348, "static_load_kN": 3800, "fatigue_load_limit_kN": 285, "max_rpm": 1400, "reference_speed_rpm": 1100, "limiting_speed_rpm": 1400, "weight_g": 97000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For sleeve mounting on a 320 mm shaft, SKF order number SKF 23064 CCK/W33 is the 1:12 tapered-bore spherical roller bearing in the 23000-series family (dimension series 30 (slim OD, extra-wide)); the cylindrical-bore equivalent is a separate order number, 23064-cc-w33. The code breaks down as type digit 2 (double-row spherical roller), dimension series 30 (dimension series 30 (slim OD, extra-wide)), and bore code 64 = 320 mm; dimensions 320×480×121 mm therefore match the ISO 15 envelope. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. Selection arithmetic: the C0/C ratio is about 1.62 (static 3800 kN against dynamic 2348 kN), typical of a spherical roller sized for heavy combined loads, and the 285 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Mounting on the 1:12 taper is controlled by clearance reduction or measured axial drive-up, never by locknut torque: SKF tables give the target radial-clearance decrease for the 320 mm 23064-cck-w33, checked with feeler gauges before and after drive-up.", "applications": [ "SAG and ball-mill drive shafts", "large mining crusher main shafts", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "At 320 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23000-series series at 320 mm bore (480×121 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "The adapter sleeve is selected by actual shaft diameter, not by the 320 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23064-cck-w33 with different sleeves.", "The adapter sleeve is selected by actual shaft diameter, not by the 320 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23064-cck-w33 with different sleeves.", "Shaft and housing fillets must clear the bearing chamfer so the 121 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 2348/3800 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23064 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23064-cck-w33?", "a": "The SKF 23064 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 320 mm nominal bore, 480 mm outer diameter and 121 mm width (12.598 × 18.898 × 4.764 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 2348 kN, C0 3800 kN, Pu 285 kN, reference speed 1,100 r/min, limiting speed 1,400 r/min, mass about 97000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23064-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23064-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 320 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23064-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23064-cck-w33 and 23064-cc-w33?", "a": "They share the ISO 15 envelope and the same 2348/3800 kN ratings, but 23064-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23064-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23064", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23064; identical ISO 15 envelope, fits OH3064 adapter sleeve on a 300 mm shaft." }, { "equiv_sku": "C3064-M", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3064 M shares the 320×480×121 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C3064-KM", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3064 KM shares the 320×480×121 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23064-CCK-W33", "SKF 23064 CCK/W33", "23064 K" ], "locale_variants": {} }, { "sku": "23164-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23164 CCK/W33", "series": "23100-series", "type": "spherical_roller", "d_mm": 320, "D_mm": 540, "B_mm": 176, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 3923, "static_load_kN": 6000, "fatigue_load_limit_kN": 440, "max_rpm": 1100, "reference_speed_rpm": 850, "limiting_speed_rpm": 1100, "weight_g": 185000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF 23164 CCK/W33 in SKF catalogue PUB BU/P1 17000 is a double-row spherical roller bearing with a tapered bore (1:12), intended for an H-series adapter sleeve or AH withdrawal sleeve, with two pressed-steel cages with a floating guide ring and the same 320×540×176 mm ISO 15 outline as its cylindrical-bore counterpart. Reading the designation: the leading 2 marks a spherical roller bearing, the 31 is the ISO 15 dimension series (dimension series 31 (medium OD, wide)), and the last two digits encode the 320 mm bore; the 540 mm OD and 176 mm width follow the ISO 15 general plan. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. At 850 r/min reference speed the 110.0 mm-section 23164-cck-w33 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 1,100 r/min as the mechanical ceiling. Because driving up the 1:12 taper consumes radial clearance, K executions are commonly ordered with C3 initial clearance so the residual running clearance after mounting matches the cylindrical-bore 23164-cc-w33 on an interference seat.", "applications": [ "large induced-draft fan rotors", "SAG and ball-mill drive shafts", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals" ], "pitfalls": [ "At 320 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23100-series series at 320 mm bore (540×176 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23164-cck-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "The 23164-cck-w33 and its cylindrical-bore counterpart 23164-cc-w33 share envelope and load ratings (3923/6000 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23164-cck-w33; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 3923/6000 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23164 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23164-cck-w33?", "a": "The SKF 23164 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 320 mm nominal bore, 540 mm outer diameter and 176 mm width (12.598 × 21.26 × 6.929 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 3923 kN, C0 6000 kN, Pu 440 kN, reference speed 850 r/min, limiting speed 1,100 r/min, mass about 185000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23164-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23164-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 320 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23164-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23164-cck-w33 and 23164-cc-w33?", "a": "They share the ISO 15 envelope and the same 3923/6000 kN ratings, but 23164-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23164-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23164", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23164; identical ISO 15 envelope, fits OH3164 adapter sleeve on a 300 mm shaft." }, { "equiv_sku": "C3164-M", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3164 M shares the 320×540×176 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C3164-KM", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3164 KM shares the 320×540×176 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23164-CCK-W33", "SKF 23164 CCK/W33", "23164 K" ], "locale_variants": {} }, { "sku": "23264-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23264 CCK/W33", "series": "23200-series", "type": "spherical_roller", "d_mm": 320, "D_mm": 580, "B_mm": 208, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4607, "static_load_kN": 6700, "fatigue_load_limit_kN": 475, "max_rpm": 950, "reference_speed_rpm": 700, "limiting_speed_rpm": 950, "weight_g": 260000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "23264-cck-w33 is the 1:12 tapered-bore execution of the 23200-series spherical roller bearing: the same two barrel-roller rows on a sphered outer raceway as 23264-cc-w33, but the inner-ring bore tapers 1 mm per 12 mm for adapter- or withdrawal-sleeve mounting, as listed by SKF in SKF catalogue PUB BU/P1 17000. Digit by digit, 23264-cck-w33 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 32, and bore reference 64 resolving to 320 mm; 580 mm OD and 208 mm width are the matching ISO 15 boundary values. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. Catalogue mass 260000 g for the 320×580×208 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. At 320 mm bore, dismount after service is by KM locknut reversal or a hydraulic nut on larger sizes; oil-injection grooves on the bigger sleeves let pressurised oil float the 23264-cck-w33 off the taper without scoring either surface.", "applications": [ "large dredger and marine winch drums", "steel-plant continuous-caster segments", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat", "split-housing plummer block arrangements with bearings swapped in situ" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals" ], "pitfalls": [ "At 320 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23200-series series at 320 mm bore (580×208 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 208 mm width changes abutment spacing, even though the 580 mm OD matches.", "The 23264-cck-w33 and its cylindrical-bore counterpart 23264-cc-w33 share envelope and load ratings (4607/6700 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23264-cck-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "The 23264-cck-w33 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 4607/6700 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The 4607/6700 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23264 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23264-cck-w33?", "a": "The SKF 23264 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 320 mm nominal bore, 580 mm outer diameter and 208 mm width (12.598 × 22.835 × 8.189 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 4607 kN, C0 6700 kN, Pu 475 kN, reference speed 700 r/min, limiting speed 950 r/min, mass about 260000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23264-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23264-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 320 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23264-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23264-cck-w33 and 23264-cc-w33?", "a": "They share the ISO 15 envelope and the same 4607/6700 kN ratings, but 23264-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23264-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23264", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23264; identical ISO 15 envelope, fits OH3264 adapter sleeve on a 300 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23264-CCK-W33", "SKF 23264 CCK/W33", "23264 K" ], "locale_variants": {} }, { "sku": "23968-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23968 CCK/W33", "series": "23900-series", "type": "spherical_roller", "d_mm": 340, "D_mm": 460, "B_mm": 90, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1490, "static_load_kN": 2800, "fatigue_load_limit_kN": 216, "max_rpm": 1400, "reference_speed_rpm": 1300, "limiting_speed_rpm": 1400, "weight_g": 67500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "23968-cck-w33 is the 1:12 tapered-bore execution of the 23900-series spherical roller bearing: the same two barrel-roller rows on a sphered outer raceway as 23968-cc-w33, but the inner-ring bore tapers 1 mm per 12 mm for adapter- or withdrawal-sleeve mounting, as listed by SKF in SKF catalogue PUB BU/P1 17000. Reading the designation: the leading 2 marks a spherical roller bearing, the 39 is the ISO 15 dimension series (dimension series 39 (compact OD, narrow)), and the last two digits encode the 340 mm bore; the 460 mm OD and 90 mm width follow the ISO 15 general plan. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. At 1,300 r/min reference speed the 60.0 mm-section 23968-cck-w33 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 1,400 r/min as the mechanical ceiling. Mounting on the 1:12 taper is controlled by clearance reduction or measured axial drive-up, never by locknut torque: SKF tables give the target radial-clearance decrease for the 340 mm 23968-cck-w33, checked with feeler gauges before and after drive-up.", "applications": [ "large induced-draft fan rotors", "SAG and ball-mill drive shafts", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "At 340 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23900-series series at 340 mm bore (460×90 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "The 23968-cck-w33 and its cylindrical-bore counterpart 23968-cc-w33 share envelope and load ratings (1490/2800 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "The 23968-cck-w33 and its cylindrical-bore counterpart 23968-cc-w33 share envelope and load ratings (1490/2800 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23968-cck-w33 pits long before its L10 life.", "The 1490/2800 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23968 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23968-cck-w33?", "a": "The SKF 23968 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 340 mm nominal bore, 460 mm outer diameter and 90 mm width (13.386 × 18.11 × 3.543 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1490 kN, C0 2800 kN, Pu 216 kN, reference speed 1,300 r/min, limiting speed 1,400 r/min, mass about 67500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23968-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23968-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 340 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23968-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23968-cck-w33 and 23968-cc-w33?", "a": "They share the ISO 15 envelope and the same 1490/2800 kN ratings, but 23968-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23968-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23968", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23968; identical ISO 15 envelope, fits OH3968 adapter sleeve on a 320 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23968-CCK-W33", "SKF 23968 CCK/W33", "23968 K" ], "locale_variants": {} }, { "sku": "23168-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23168 CCK/W33", "series": "23100-series", "type": "spherical_roller", "d_mm": 340, "D_mm": 580, "B_mm": 190, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4445, "static_load_kN": 6800, "fatigue_load_limit_kN": 480, "max_rpm": 1000, "reference_speed_rpm": 800, "limiting_speed_rpm": 1000, "weight_g": 250000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "23168-cck-w33 is the 1:12 tapered-bore execution of the 23100-series spherical roller bearing: the same two barrel-roller rows on a sphered outer raceway as 23168-cc-w33, but the inner-ring bore tapers 1 mm per 12 mm for adapter- or withdrawal-sleeve mounting, as listed by SKF in SKF catalogue PUB BU/P1 17000. The code breaks down as type digit 2 (double-row spherical roller), dimension series 31 (dimension series 31 (medium OD, wide)), and bore code 68 = 340 mm; dimensions 340×580×190 mm therefore match the ISO 15 envelope. The K in the designation marks the 1:12 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. The 480 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.53 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. At 340 mm bore, dismount after service is by KM locknut reversal or a hydraulic nut on larger sizes; oil-injection grooves on the bigger sleeves let pressurised oil float the 23168-cck-w33 off the taper without scoring either surface.", "applications": [ "steel-plant continuous-caster segments", "large induced-draft fan rotors", "fan and pulley shafts that need periodic bearing removal in the field", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems" ], "pitfalls": [ "At 340 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23100-series series at 340 mm bore (580×190 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23168-cck-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "The 23168-cck-w33 and its cylindrical-bore counterpart 23168-cc-w33 share envelope and load ratings (4445/6800 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23168-cck-w33; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 4445/6800 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23168 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23168-cck-w33?", "a": "The SKF 23168 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 340 mm nominal bore, 580 mm outer diameter and 190 mm width (13.386 × 22.835 × 7.48 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 4445 kN, C0 6800 kN, Pu 480 kN, reference speed 800 r/min, limiting speed 1,000 r/min, mass about 250000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23168-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23168-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 340 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23168-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23168-cck-w33 and 23168-cc-w33?", "a": "They share the ISO 15 envelope and the same 4445/6800 kN ratings, but 23168-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23168-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23168", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23168; identical ISO 15 envelope, fits OH3168 adapter sleeve on a 320 mm shaft." }, { "equiv_sku": "C3168-M", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 3168 M shares the 340×580×190 mm envelope but catalogue C/C0 differ (4900/7500 kN vs 4445/6800 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C3168-KM", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 3168 KM shares the 340×580×190 mm envelope but catalogue C/C0 differ (4900/7500 kN vs 4445/6800 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23168-CCK-W33", "SKF 23168 CCK/W33", "23168 K" ], "locale_variants": {} }, { "sku": "23268-CAK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23268 CAK/W33", "series": "23200-series", "type": "spherical_roller", "d_mm": 340, "D_mm": 620, "B_mm": 224, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass_machined_M1", "dynamic_load_kN": 5362, "static_load_kN": 7800, "fatigue_load_limit_kN": 550, "max_rpm": 800, "reference_speed_rpm": 560, "limiting_speed_rpm": 800, "weight_g": 335000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For sleeve mounting on a 340 mm shaft, SKF order number SKF 23268 CAK/W33 is the 1:12 tapered-bore spherical roller bearing in the 23200-series family (dimension series 32 (medium OD, extra wide)); the cylindrical-bore equivalent is a separate order number, 23268-cak-w33. Reading the designation: the leading 2 marks a spherical roller bearing, the 32 is the ISO 15 dimension series (dimension series 32 (medium OD, extra wide)), and the last two digits encode the 340 mm bore; the 620 mm OD and 224 mm width follow the ISO 15 general plan. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. The 550 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.45 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. Mounting on the 1:12 taper is controlled by clearance reduction or measured axial drive-up, never by locknut torque: SKF tables give the target radial-clearance decrease for the 340 mm 23268-cak-w33, checked with feeler gauges before and after drive-up.", "applications": [ "steel-plant continuous-caster segments", "large induced-draft fan rotors", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder", "fan and pulley shafts that need periodic bearing removal in the field" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals" ], "pitfalls": [ "At 340 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23200-series series at 340 mm bore (620×224 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 224 mm width changes abutment spacing, even though the 620 mm OD matches.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 224 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23268-cak-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "Catalogue reference speed and limiting speed are different limits: the 560 r/min reference is a thermal criterion under load, while the 800 r/min limiting value is the mechanical ceiling — observe both.", "The 5362/7800 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23268 CAK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23268-cak-w33?", "a": "The SKF 23268 CAK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 340 mm nominal bore, 620 mm outer diameter and 224 mm width (13.386 × 24.409 × 8.819 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 5362 kN, C0 7800 kN, Pu 550 kN, reference speed 560 r/min, limiting speed 800 r/min, mass about 335000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23268-cak-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23268-cak-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 340 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23268-cak-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23268-cak-w33 and 23268-cak-w33?", "a": "They share the ISO 15 envelope and the same 5362/7800 kN ratings, but 23268-cak-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23268-cak-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23268", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23268; identical ISO 15 envelope, fits OH3268 adapter sleeve on a 320 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23268-CAK-W33", "SKF 23268 CAK/W33", "23268 K" ], "locale_variants": {} }, { "sku": "23972-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23972 CCK/W33", "series": "23900-series", "type": "spherical_roller", "d_mm": 360, "D_mm": 480, "B_mm": 90, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1456, "static_load_kN": 2750, "fatigue_load_limit_kN": 220, "max_rpm": 1300, "reference_speed_rpm": 1200, "limiting_speed_rpm": 1300, "weight_g": 70500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF lists SKF 23972 CCK/W33 as the adapter-sleeve execution in the 23900-series range: a 360 mm nominal-bore spherical roller bearing whose 1:12 tapered inner ring is driven up a sleeve, with 480 mm OD and 90 mm width to the ISO 15 envelope. On the SKF nameplate, 23972-cck-w33 follows the ISO 15 convention: 2 for the spherical roller type, 39 for the dimension series 39 (compact OD, narrow), final digits 72 for the 360 mm bore. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. The 60.0 mm radial section height ((480−360)/2) and 70500 g catalogue mass frame a 360 mm bore bearing rated at 1456 kN C — roughly 4.04 kN of dynamic capacity per millimetre of bore before application factors. Mounting on the 1:12 taper is controlled by clearance reduction or measured axial drive-up, never by locknut torque: SKF tables give the target radial-clearance decrease for the 360 mm 23972-cck-w33, checked with feeler gauges before and after drive-up.", "applications": [ "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat", "split-housing plummer block arrangements with bearings swapped in situ" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals" ], "pitfalls": [ "At 360 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23900-series series at 360 mm bore (480×90 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "The adapter sleeve is selected by actual shaft diameter, not by the 360 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23972-cck-w33 with different sleeves.", "The adapter sleeve is selected by actual shaft diameter, not by the 360 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23972-cck-w33 with different sleeves.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 1456/2750 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23972 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23972-cck-w33?", "a": "The SKF 23972 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 360 mm nominal bore, 480 mm outer diameter and 90 mm width (14.173 × 18.898 × 3.543 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1456 kN, C0 2750 kN, Pu 220 kN, reference speed 1,200 r/min, limiting speed 1,300 r/min, mass about 70500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23972-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23972-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 360 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23972-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23972-cck-w33 and 23972-cc-w33?", "a": "They share the ISO 15 envelope and the same 1456/2750 kN ratings, but 23972-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23972-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23972", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23972; identical ISO 15 envelope, fits OH3972 adapter sleeve on a 340 mm shaft." }, { "equiv_sku": "C3972-M", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 3972 M shares the 360×480×90 mm envelope but catalogue C/C0 differ (1760/3250 kN vs 1456/2750 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C3972-KM", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 3972 KM shares the 360×480×90 mm envelope but catalogue C/C0 differ (1760/3250 kN vs 1456/2750 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23972-CCK-W33", "SKF 23972 CCK/W33", "23972 K" ], "locale_variants": {} }, { "sku": "23172-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23172 CCK/W33", "series": "23100-series", "type": "spherical_roller", "d_mm": 360, "D_mm": 600, "B_mm": 192, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4515, "static_load_kN": 6950, "fatigue_load_limit_kN": 490, "max_rpm": 1000, "reference_speed_rpm": 750, "limiting_speed_rpm": 1000, "weight_g": 260000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF lists SKF 23172 CCK/W33 as the adapter-sleeve execution in the 23100-series range: a 360 mm nominal-bore spherical roller bearing whose 1:12 tapered inner ring is driven up a sleeve, with 600 mm OD and 192 mm width to the ISO 15 envelope. Numbering ties the bearing to its envelope: 23172-cck-w33 means spherical-roller type, dimension series 31, 360 mm bore — which is why the 600×192 mm outline swaps dimensionally with other ISO 15 bearings of the same code. Reading the suffix on 23172-cck-w33, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 23172-cc-w33. Speed planning uses two different ceilings: 750 r/min thermal reference and 1,000 r/min mechanical limiting speed. At 360 mm bore, dismount after service is by KM locknut reversal or a hydraulic nut on larger sizes; oil-injection grooves on the bigger sleeves let pressurised oil float the 23172-cck-w33 off the taper without scoring either surface.", "applications": [ "large mining crusher main shafts", "wind-turbine main shaft support", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "smearing on the roller-raceway contact during skid starts below the minimum load" ], "pitfalls": [ "At 360 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23100-series series at 360 mm bore (600×192 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 192 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "The adapter sleeve is selected by actual shaft diameter, not by the 360 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23172-cck-w33 with different sleeves.", "Shaft and housing fillets must clear the bearing chamfer so the 192 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 4515/6950 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23172 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23172-cck-w33?", "a": "The SKF 23172 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 360 mm nominal bore, 600 mm outer diameter and 192 mm width (14.173 × 23.622 × 7.559 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 4515 kN, C0 6950 kN, Pu 490 kN, reference speed 750 r/min, limiting speed 1,000 r/min, mass about 260000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23172-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23172-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 360 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23172-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23172-cck-w33 and 23172-cc-w33?", "a": "They share the ISO 15 envelope and the same 4515/6950 kN ratings, but 23172-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23172-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23172", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23172; identical ISO 15 envelope, fits OH3172 adapter sleeve on a 340 mm shaft." }, { "equiv_sku": "C3172-M", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 3172 M shares the 360×600×192 mm envelope but catalogue C/C0 differ (5000/8000 kN vs 4515/6950 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C3172-KM", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 3172 KM shares the 360×600×192 mm envelope but catalogue C/C0 differ (5000/8000 kN vs 4515/6950 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23172-CCK-W33", "SKF 23172 CCK/W33", "23172 K" ], "locale_variants": {} }, { "sku": "23272-CAK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23272 CAK/W33", "series": "23200-series", "type": "spherical_roller", "d_mm": 360, "D_mm": 650, "B_mm": 232, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass_machined_M1", "dynamic_load_kN": 5663, "static_load_kN": 8300, "fatigue_load_limit_kN": 570, "max_rpm": 750, "reference_speed_rpm": 530, "limiting_speed_rpm": 750, "weight_g": 375000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The SKF 23272 CAK/W33 is a 360×650×232 mm spherical roller bearing with a 1:12 tapered bore — SKF catalogue execution for sleeve mounting on a 360 mm plain shaft, retaining the double-row self-aligning barrel-roller design. On the SKF nameplate, 23272-cak-w33 follows the ISO 15 convention: 2 for the spherical roller type, 32 for the dimension series 32 (medium OD, extra wide), final digits 72 for the 360 mm bore. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. Selection arithmetic: the C0/C ratio is about 1.47 (static 8300 kN against dynamic 5663 kN), typical of a spherical roller sized for heavy combined loads, and the 570 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Because driving up the 1:12 taper consumes radial clearance, K executions are commonly ordered with C3 initial clearance so the residual running clearance after mounting matches the cylindrical-bore 23272-cak-w33 on an interference seat.", "applications": [ "SAG and ball-mill drive shafts", "large mining crusher main shafts", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat", "split-housing plummer block arrangements with bearings swapped in situ" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals" ], "pitfalls": [ "At 360 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23200-series series at 360 mm bore (650×232 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 232 mm width changes abutment spacing, even though the 650 mm OD matches.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23272-cak-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "The adapter sleeve is selected by actual shaft diameter, not by the 360 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23272-cak-w33 with different sleeves.", "Catalogue reference speed and limiting speed are different limits: the 530 r/min reference is a thermal criterion under load, while the 750 r/min limiting value is the mechanical ceiling — observe both.", "The 5663/8300 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23272 CAK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23272-cak-w33?", "a": "The SKF 23272 CAK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 360 mm nominal bore, 650 mm outer diameter and 232 mm width (14.173 × 25.591 × 9.134 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 5663 kN, C0 8300 kN, Pu 570 kN, reference speed 530 r/min, limiting speed 750 r/min, mass about 375000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23272-cak-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23272-cak-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 360 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23272-cak-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23272-cak-w33 and 23272-cak-w33?", "a": "They share the ISO 15 envelope and the same 5663/8300 kN ratings, but 23272-cak-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23272-cak-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23272", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23272; identical ISO 15 envelope, fits OH3272 adapter sleeve on a 340 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23272-CAK-W33", "SKF 23272 CAK/W33", "23272 K" ], "locale_variants": {} }, { "sku": "23976-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23976 CCK/W33", "series": "23900-series", "type": "spherical_roller", "d_mm": 380, "D_mm": 520, "B_mm": 106, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2011, "static_load_kN": 3800, "fatigue_load_limit_kN": 285, "max_rpm": 1200, "reference_speed_rpm": 1100, "limiting_speed_rpm": 1200, "weight_g": 95000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For sleeve mounting on a 380 mm shaft, SKF order number SKF 23976 CCK/W33 is the 1:12 tapered-bore spherical roller bearing in the 23900-series family (dimension series 39 (compact OD, narrow)); the cylindrical-bore equivalent is a separate order number, 23976-cc-w33. Numbering ties the bearing to its envelope: 23976-cck-w33 means spherical-roller type, dimension series 39, 380 mm bore — which is why the 520×106 mm outline swaps dimensionally with other ISO 15 bearings of the same code. The K in the designation marks the 1:12 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. Speed planning uses two different ceilings: 1,100 r/min thermal reference and 1,200 r/min mechanical limiting speed. After drive-up, re-check radial clearance and then swing the outer ring through its self-aligning range: the sphered raceway of the 23976-cck-w33 must still tilt ≈ 0.5–2.5° freely — a joint that binds after sleeve mounting signals excessive drive-up or a cocked sleeve.", "applications": [ "large mining crusher main shafts", "wind-turbine main shaft support", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems" ], "pitfalls": [ "At 380 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23900-series series at 380 mm bore (520×106 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "The adapter sleeve is selected by actual shaft diameter, not by the 380 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23976-cck-w33 with different sleeves.", "The adapter sleeve is selected by actual shaft diameter, not by the 380 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23976-cck-w33 with different sleeves.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 2011/3800 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23976 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23976-cck-w33?", "a": "The SKF 23976 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 380 mm nominal bore, 520 mm outer diameter and 106 mm width (14.961 × 20.472 × 4.173 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 2011 kN, C0 3800 kN, Pu 285 kN, reference speed 1,100 r/min, limiting speed 1,200 r/min, mass about 95000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23976-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23976-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 380 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23976-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23976-cck-w33 and 23976-cc-w33?", "a": "They share the ISO 15 envelope and the same 2011/3800 kN ratings, but 23976-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23976-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23976", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23976; identical ISO 15 envelope, fits OH3976 adapter sleeve on a 360 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23976-CCK-W33", "SKF 23976 CCK/W33", "23976 K" ], "locale_variants": {} }, { "sku": "23176-CAK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23176 CAK/W33", "series": "23100-series", "type": "spherical_roller", "d_mm": 380, "D_mm": 620, "B_mm": 194, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass_machined_M1", "dynamic_load_kN": 4561, "static_load_kN": 7100, "fatigue_load_limit_kN": 500, "max_rpm": 1000, "reference_speed_rpm": 560, "limiting_speed_rpm": 1000, "weight_g": 275000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The SKF 23176 CAK/W33 is a 380×620×194 mm spherical roller bearing with a 1:12 tapered bore — SKF catalogue execution for sleeve mounting on a 380 mm plain shaft, retaining the double-row self-aligning barrel-roller design. Digit by digit, 23176-cak-w33 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 31, and bore reference 76 resolving to 380 mm; 620 mm OD and 194 mm width are the matching ISO 15 boundary values. The K in the designation marks the 1:12 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. Speed planning uses two different ceilings: 560 r/min thermal reference and 1,000 r/min mechanical limiting speed. Because driving up the 1:12 taper consumes radial clearance, K executions are commonly ordered with C3 initial clearance so the residual running clearance after mounting matches the cylindrical-bore 23176-cak-w33 on an interference seat.", "applications": [ "large mining crusher main shafts", "wind-turbine main shaft support", "fan and pulley shafts that need periodic bearing removal in the field", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems" ], "pitfalls": [ "At 380 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23100-series series at 380 mm bore (620×194 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.", "The adapter sleeve is selected by actual shaft diameter, not by the 380 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23176-cak-w33 with different sleeves.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23176-cak-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "Shaft and housing fillets must clear the bearing chamfer so the 194 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 4561/7100 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23176 CAK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23176-cak-w33?", "a": "The SKF 23176 CAK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 380 mm nominal bore, 620 mm outer diameter and 194 mm width (14.961 × 24.409 × 7.638 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 4561 kN, C0 7100 kN, Pu 500 kN, reference speed 560 r/min, limiting speed 1,000 r/min, mass about 275000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23176-cak-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23176-cak-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 380 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23176-cak-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23176-cak-w33 and 23176-cak-w33?", "a": "They share the ISO 15 envelope and the same 4561/7100 kN ratings, but 23176-cak-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23176-cak-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23176", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23176; identical ISO 15 envelope, fits OH3176 adapter sleeve on a 360 mm shaft." }, { "equiv_sku": "C3176-MB", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3176 MB shares the 380×620×194 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C3176-KMB", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3176 KMB shares the 380×620×194 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23176-CAK-W33", "SKF 23176 CAK/W33", "23176 K" ], "locale_variants": {} }, { "sku": "23276-CAK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23276 CAK/W33", "series": "23200-series", "type": "spherical_roller", "d_mm": 380, "D_mm": 680, "B_mm": 240, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass_machined_M1", "dynamic_load_kN": 6126, "static_load_kN": 9150, "fatigue_load_limit_kN": 620, "max_rpm": 750, "reference_speed_rpm": 500, "limiting_speed_rpm": 750, "weight_g": 420000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 23276-cak-w33 denotes the tapered-bore version (K suffix, taper 1:12) of the 23200-series spherical roller bearing: dimensioned 380×680×240 mm, it seats on an adapter or withdrawal sleeve rather than directly on a machined journal. Numbering ties the bearing to its envelope: 23276-cak-w33 means spherical-roller type, dimension series 32, 380 mm bore — which is why the 680×240 mm outline swaps dimensionally with other ISO 15 bearings of the same code. Reading the suffix on 23276-cak-w33, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CA machined-brass-cage design with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 23276-cak-w33. Selection arithmetic: the C0/C ratio is about 1.49 (static 9150 kN against dynamic 6126 kN), typical of a spherical roller sized for heavy combined loads, and the 620 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. After drive-up, re-check radial clearance and then swing the outer ring through its self-aligning range: the sphered raceway of the 23276-cak-w33 must still tilt ≈ 0.5–2.5° freely — a joint that binds after sleeve mounting signals excessive drive-up or a cocked sleeve.", "applications": [ "SAG and ball-mill drive shafts", "large mining crusher main shafts", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder", "fan and pulley shafts that need periodic bearing removal in the field" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "smearing on the roller-raceway contact during skid starts below the minimum load" ], "pitfalls": [ "At 380 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23200-series series at 380 mm bore (680×240 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 240 mm width changes abutment spacing, even though the 680 mm OD matches.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23276-cak-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 240 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23276-cak-w33; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 6126/9150 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23276 CAK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23276-cak-w33?", "a": "The SKF 23276 CAK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 380 mm nominal bore, 680 mm outer diameter and 240 mm width (14.961 × 26.772 × 9.449 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 6126 kN, C0 9150 kN, Pu 620 kN, reference speed 500 r/min, limiting speed 750 r/min, mass about 420000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23276-cak-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23276-cak-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 380 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23276-cak-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23276-cak-w33 and 23276-cak-w33?", "a": "They share the ISO 15 envelope and the same 6126/9150 kN ratings, but 23276-cak-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23276-cak-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23276", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23276; identical ISO 15 envelope, fits OH3276 adapter sleeve on a 360 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23276-CAK-W33", "SKF 23276 CAK/W33", "23276 K" ], "locale_variants": {} }, { "sku": "23980-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23980 CCK/W33", "series": "23900-series", "type": "spherical_roller", "d_mm": 400, "D_mm": 540, "B_mm": 106, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2038, "static_load_kN": 3900, "fatigue_load_limit_kN": 290, "max_rpm": 1200, "reference_speed_rpm": 1100, "limiting_speed_rpm": 1200, "weight_g": 100000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The SKF 23980 CCK/W33 is a 400×540×106 mm spherical roller bearing with a 1:12 tapered bore — SKF catalogue execution for sleeve mounting on a 400 mm plain shaft, retaining the double-row self-aligning barrel-roller design. Reading the designation: the leading 2 marks a spherical roller bearing, the 39 is the ISO 15 dimension series (dimension series 39 (compact OD, narrow)), and the last two digits encode the 400 mm bore; the 540 mm OD and 106 mm width follow the ISO 15 general plan. Reading the suffix on 23980-cck-w33, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 23980-cc-w33. Catalogue mass 100000 g for the 400×540×106 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. After drive-up, re-check radial clearance and then swing the outer ring through its self-aligning range: the sphered raceway of the 23980-cck-w33 must still tilt ≈ 0.5–2.5° freely — a joint that binds after sleeve mounting signals excessive drive-up or a cocked sleeve.", "applications": [ "large dredger and marine winch drums", "steel-plant continuous-caster segments", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat", "split-housing plummer block arrangements with bearings swapped in situ" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "smearing on the roller-raceway contact during skid starts below the minimum load" ], "pitfalls": [ "At 400 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23900-series series at 400 mm bore (540×106 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "The 23980-cck-w33 and its cylindrical-bore counterpart 23980-cc-w33 share envelope and load ratings (2038/3900 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "The 23980-cck-w33 and its cylindrical-bore counterpart 23980-cc-w33 share envelope and load ratings (2038/3900 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "The 100000 g mass and 106 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23980-cck-w33.", "The 2038/3900 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23980 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23980-cck-w33?", "a": "The SKF 23980 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 400 mm nominal bore, 540 mm outer diameter and 106 mm width (15.748 × 21.26 × 4.173 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 2038 kN, C0 3900 kN, Pu 290 kN, reference speed 1,100 r/min, limiting speed 1,200 r/min, mass about 100000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23980-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23980-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 400 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23980-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23980-cck-w33 and 23980-cc-w33?", "a": "They share the ISO 15 envelope and the same 2038/3900 kN ratings, but 23980-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23980-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23980", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23980; identical ISO 15 envelope, fits OH3980 adapter sleeve on a 380 mm shaft." }, { "equiv_sku": "C3980-KM", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3980 KM shares the 400×540×106 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23980-CCK-W33", "SKF 23980 CCK/W33", "23980 K" ], "locale_variants": {} }, { "sku": "23180-CAK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23180 CAK/W33", "series": "23100-series", "type": "spherical_roller", "d_mm": 400, "D_mm": 650, "B_mm": 200, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass_machined_M1", "dynamic_load_kN": 4864, "static_load_kN": 7650, "fatigue_load_limit_kN": 530, "max_rpm": 950, "reference_speed_rpm": 530, "limiting_speed_rpm": 950, "weight_g": 325000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For sleeve mounting on a 400 mm shaft, SKF order number SKF 23180 CAK/W33 is the 1:12 tapered-bore spherical roller bearing in the 23100-series family (dimension series 31 (medium OD, wide)); the cylindrical-bore equivalent is a separate order number, 23180-cak-w33. The code breaks down as type digit 2 (double-row spherical roller), dimension series 31 (dimension series 31 (medium OD, wide)), and bore code 80 = 400 mm; dimensions 400×650×200 mm therefore match the ISO 15 envelope. Reading the suffix on 23180-cak-w33, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CA machined-brass-cage design with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 23180-cak-w33. Catalogue mass 325000 g for the 400×650×200 mm open execution covers the a one-piece machined brass cage guided on the inner ring (CA design); tapered-bore and sealed variants differ in mass and carry their own order numbers. Because driving up the 1:12 taper consumes radial clearance, K executions are commonly ordered with C3 initial clearance so the residual running clearance after mounting matches the cylindrical-bore 23180-cak-w33 on an interference seat.", "applications": [ "large dredger and marine winch drums", "steel-plant continuous-caster segments", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "smearing on the roller-raceway contact during skid starts below the minimum load" ], "pitfalls": [ "At 400 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23100-series series at 400 mm bore (650×200 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.", "The 23180-cak-w33 and its cylindrical-bore counterpart 23180-cak-w33 share envelope and load ratings (4864/7650 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 200 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23180-cak-w33 pits long before its L10 life.", "The 4864/7650 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23180 CAK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23180-cak-w33?", "a": "The SKF 23180 CAK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 400 mm nominal bore, 650 mm outer diameter and 200 mm width (15.748 × 25.591 × 7.874 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 4864 kN, C0 7650 kN, Pu 530 kN, reference speed 530 r/min, limiting speed 950 r/min, mass about 325000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23180-cak-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23180-cak-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 400 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23180-cak-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23180-cak-w33 and 23180-cak-w33?", "a": "They share the ISO 15 envelope and the same 4864/7650 kN ratings, but 23180-cak-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23180-cak-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23180", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23180; identical ISO 15 envelope, fits OH3180 adapter sleeve on a 380 mm shaft." }, { "equiv_sku": "C3180-M", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3180 M shares the 400×650×200 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C3180-KM", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3180 KM shares the 400×650×200 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23180-CAK-W33", "SKF 23180 CAK/W33", "23180 K" ], "locale_variants": {} }, { "sku": "23280-CAK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23280 CAK/W33", "series": "23200-series", "type": "spherical_roller", "d_mm": 400, "D_mm": 720, "B_mm": 256, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass_machined_M1", "dynamic_load_kN": 6881, "static_load_kN": 10400, "fatigue_load_limit_kN": 680, "max_rpm": 670, "reference_speed_rpm": 480, "limiting_speed_rpm": 670, "weight_g": 505000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF 23280 CAK/W33 in SKF catalogue PUB BU/P1 17000 is a double-row spherical roller bearing with a tapered bore (1:12), intended for an H-series adapter sleeve or AH withdrawal sleeve, with a one-piece machined brass cage guided on the inner ring (CA design) and the same 400×720×256 mm ISO 15 outline as its cylindrical-bore counterpart. Reading the designation: the leading 2 marks a spherical roller bearing, the 32 is the ISO 15 dimension series (dimension series 32 (medium OD, extra wide)), and the last two digits encode the 400 mm bore; the 720 mm OD and 256 mm width follow the ISO 15 general plan. Reading the suffix on 23280-cak-w33, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CA machined-brass-cage design with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 23280-cak-w33. The 160.0 mm radial section height ((720−400)/2) and 505000 g catalogue mass frame a 400 mm bore bearing rated at 6881 kN C — roughly 17.20 kN of dynamic capacity per millimetre of bore before application factors. At 400 mm bore, dismount after service is by KM locknut reversal or a hydraulic nut on larger sizes; oil-injection grooves on the bigger sleeves let pressurised oil float the 23280-cak-w33 off the taper without scoring either surface.", "applications": [ "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat", "split-housing plummer block arrangements with bearings swapped in situ" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "smearing on the roller-raceway contact during skid starts below the minimum load" ], "pitfalls": [ "At 400 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23200-series series at 400 mm bore (720×256 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 256 mm width changes abutment spacing, even though the 720 mm OD matches.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 256 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "The 23280-cak-w33 and its cylindrical-bore counterpart 23280-cak-w33 share envelope and load ratings (6881/10400 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23280-cak-w33; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 6881/10400 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23280 CAK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23280-cak-w33?", "a": "The SKF 23280 CAK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 400 mm nominal bore, 720 mm outer diameter and 256 mm width (15.748 × 28.346 × 10.079 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 6881 kN, C0 10400 kN, Pu 680 kN, reference speed 480 r/min, limiting speed 670 r/min, mass about 505000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23280-cak-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23280-cak-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 400 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23280-cak-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23280-cak-w33 and 23280-cak-w33?", "a": "They share the ISO 15 envelope and the same 6881/10400 kN ratings, but 23280-cak-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23280-cak-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23280", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23280; identical ISO 15 envelope, fits OH3280 adapter sleeve on a 380 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23280-CAK-W33", "SKF 23280 CAK/W33", "23280 K" ], "locale_variants": {} }, { "sku": "23984-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23984 CCK/W33", "series": "23900-series", "type": "spherical_roller", "d_mm": 420, "D_mm": 560, "B_mm": 106, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2083, "static_load_kN": 4150, "fatigue_load_limit_kN": 300, "max_rpm": 1100, "reference_speed_rpm": 1000, "limiting_speed_rpm": 1100, "weight_g": 105000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 23984-cck-w33 denotes the tapered-bore version (K suffix, taper 1:12) of the 23900-series spherical roller bearing: dimensioned 420×560×106 mm, it seats on an adapter or withdrawal sleeve rather than directly on a machined journal. The code breaks down as type digit 2 (double-row spherical roller), dimension series 39 (dimension series 39 (compact OD, narrow)), and bore code 84 = 420 mm; dimensions 420×560×106 mm therefore match the ISO 15 envelope. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. With C 2083 kN and C0 4150 kN, the 23984-cck-w33 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. For shafts with a locating shoulder, use an AH withdrawal sleeve instead of an adapter sleeve: the bearing presses against the shoulder and the sleeve is drawn out for dismounting, making the 23984-cck-w33 removable without an induction heater.", "applications": [ "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still" ], "pitfalls": [ "At 420 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23900-series series at 420 mm bore (560×106 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "The 23984-cck-w33 and its cylindrical-bore counterpart 23984-cc-w33 share envelope and load ratings (2083/4150 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "The 23984-cck-w33 and its cylindrical-bore counterpart 23984-cc-w33 share envelope and load ratings (2083/4150 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "The 105000 g mass and 106 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23984-cck-w33.", "The 2083/4150 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23984 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23984-cck-w33?", "a": "The SKF 23984 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 420 mm nominal bore, 560 mm outer diameter and 106 mm width (16.535 × 22.047 × 4.173 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 2083 kN, C0 4150 kN, Pu 300 kN, reference speed 1,000 r/min, limiting speed 1,100 r/min, mass about 105000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23984-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23984-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 420 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23984-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23984-cck-w33 and 23984-cc-w33?", "a": "They share the ISO 15 envelope and the same 2083/4150 kN ratings, but 23984-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23984-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23984", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23984; identical ISO 15 envelope, fits OH3984 adapter sleeve on a 400 mm shaft." }, { "equiv_sku": "C3984-M", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3984 M shares the 420×560×106 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C3984-KM", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3984 KM shares the 420×560×106 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23984-CCK-W33", "SKF 23984 CCK/W33", "23984 K" ], "locale_variants": {} }, { "sku": "23184-CKJ-W33", "brand": "SKF", "manufacturer_designation": "SKF 23184 CKJ/W33", "series": "23100-series", "type": "spherical_roller", "d_mm": 420, "D_mm": 700, "B_mm": 224, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5919, "static_load_kN": 9300, "fatigue_load_limit_kN": 620, "max_rpm": 900, "reference_speed_rpm": 480, "limiting_speed_rpm": 900, "weight_g": 410000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 23184-ckj-w33 denotes the tapered-bore version (K suffix, taper 1:12) of the 23100-series spherical roller bearing: dimensioned 420×700×224 mm, it seats on an adapter or withdrawal sleeve rather than directly on a machined journal. Digit by digit, 23184-ckj-w33 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 31, and bore reference 84 resolving to 420 mm; 700 mm OD and 224 mm width are the matching ISO 15 boundary values. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. The 140.0 mm radial section height ((700−420)/2) and 410000 g catalogue mass frame a 420 mm bore bearing rated at 5919 kN C — roughly 14.09 kN of dynamic capacity per millimetre of bore before application factors. After drive-up, re-check radial clearance and then swing the outer ring through its self-aligning range: the sphered raceway of the 23184-ckj-w33 must still tilt ≈ 0.5–2.5° freely — a joint that binds after sleeve mounting signals excessive drive-up or a cocked sleeve.", "applications": [ "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder", "fan and pulley shafts that need periodic bearing removal in the field" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "At 420 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23100-series series at 420 mm bore (700×224 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.", "The 23184-ckj-w33 and its cylindrical-bore counterpart 23184-ckj-w33 share envelope and load ratings (5919/9300 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23184-ckj-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 5919/9300 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23184 CKJ/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23184-ckj-w33?", "a": "The SKF 23184 CKJ/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 420 mm nominal bore, 700 mm outer diameter and 224 mm width (16.535 × 27.559 × 8.819 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 5919 kN, C0 9300 kN, Pu 620 kN, reference speed 480 r/min, limiting speed 900 r/min, mass about 410000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23184-ckj-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23184-ckj-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 420 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23184-ckj-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23184-ckj-w33 and 23184-ckj-w33?", "a": "They share the ISO 15 envelope and the same 5919/9300 kN ratings, but 23184-ckj-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23184-ckj-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23184", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23184; identical ISO 15 envelope, fits OH3184 adapter sleeve on a 400 mm shaft." }, { "equiv_sku": "C3184-M", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 3184 M shares the 420×700×224 mm envelope but catalogue C/C0 differ (6000/10400 kN vs 5919/9300 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C3184-KM", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 3184 KM shares the 420×700×224 mm envelope but catalogue C/C0 differ (6000/10400 kN vs 5919/9300 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23184-CKJ-W33", "SKF 23184 CKJ/W33", "23184 K" ], "locale_variants": {} }, { "sku": "23284-CAK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23284 CAK/W33", "series": "23200-series", "type": "spherical_roller", "d_mm": 420, "D_mm": 760, "B_mm": 272, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass_machined_M1", "dynamic_load_kN": 7677, "static_load_kN": 11600, "fatigue_load_limit_kN": 765, "max_rpm": 630, "reference_speed_rpm": 450, "limiting_speed_rpm": 630, "weight_g": 590000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF 23284 CAK/W33 in SKF catalogue PUB BU/P1 17000 is a double-row spherical roller bearing with a tapered bore (1:12), intended for an H-series adapter sleeve or AH withdrawal sleeve, with a one-piece machined brass cage guided on the inner ring (CA design) and the same 420×760×272 mm ISO 15 outline as its cylindrical-bore counterpart. The code breaks down as type digit 2 (double-row spherical roller), dimension series 32 (dimension series 32 (medium OD, extra wide)), and bore code 84 = 420 mm; dimensions 420×760×272 mm therefore match the ISO 15 envelope. Reading the suffix on 23284-cak-w33, the K (or EK/CCK) element changes only the bore — 1:12 taper for sleeve mounting — while the rest of the suffix chain (CA machined-brass-cage design with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 23284-cak-w33. Speed planning uses two different ceilings: 450 r/min thermal reference and 630 r/min mechanical limiting speed. Because driving up the 1:12 taper consumes radial clearance, K executions are commonly ordered with C3 initial clearance so the residual running clearance after mounting matches the cylindrical-bore 23284-cak-w33 on an interference seat.", "applications": [ "large mining crusher main shafts", "wind-turbine main shaft support", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "smearing on the roller-raceway contact during skid starts below the minimum load" ], "pitfalls": [ "At 420 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23200-series series at 420 mm bore (760×272 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 272 mm width changes abutment spacing, even though the 760 mm OD matches.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 272 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "The 23284-cak-w33 and its cylindrical-bore counterpart 23284-cak-w33 share envelope and load ratings (7677/11600 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "Never use the tapered-bore EK/K variant's drive-up figures on this cylindrical-bore 23284-cak-w33; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 7677/11600 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23284 CAK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23284-cak-w33?", "a": "The SKF 23284 CAK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 420 mm nominal bore, 760 mm outer diameter and 272 mm width (16.535 × 29.921 × 10.709 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 7677 kN, C0 11600 kN, Pu 765 kN, reference speed 450 r/min, limiting speed 630 r/min, mass about 590000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23284-cak-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23284-cak-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 420 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23284-cak-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23284-cak-w33 and 23284-cak-w33?", "a": "They share the ISO 15 envelope and the same 7677/11600 kN ratings, but 23284-cak-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23284-cak-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23284", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23284; identical ISO 15 envelope, fits OH3284 adapter sleeve on a 400 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23284-CAK-W33", "SKF 23284 CAK/W33", "23284 K" ], "locale_variants": {} }, { "sku": "23988-CCK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23988 CCK/W33", "series": "23900-series", "type": "spherical_roller", "d_mm": 440, "D_mm": 600, "B_mm": 118, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2506, "static_load_kN": 4900, "fatigue_load_limit_kN": 345, "max_rpm": 1000, "reference_speed_rpm": 950, "limiting_speed_rpm": 1000, "weight_g": 150000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 23988-cck-w33 denotes the tapered-bore version (K suffix, taper 1:12) of the 23900-series spherical roller bearing: dimensioned 440×600×118 mm, it seats on an adapter or withdrawal sleeve rather than directly on a machined journal. On the SKF nameplate, 23988-cck-w33 follows the ISO 15 convention: 2 for the spherical roller type, 39 for the dimension series 39 (compact OD, narrow), final digits 88 for the 440 mm bore. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. The 80.0 mm radial section height ((600−440)/2) and 150000 g catalogue mass frame a 440 mm bore bearing rated at 2506 kN C — roughly 5.70 kN of dynamic capacity per millimetre of bore before application factors. After drive-up, re-check radial clearance and then swing the outer ring through its self-aligning range: the sphered raceway of the 23988-cck-w33 must still tilt ≈ 0.5–2.5° freely — a joint that binds after sleeve mounting signals excessive drive-up or a cocked sleeve.", "applications": [ "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "fan and pulley shafts that need periodic bearing removal in the field", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still" ], "pitfalls": [ "At 440 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23900-series series at 440 mm bore (600×118 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "The 23988-cck-w33 and its cylindrical-bore counterpart 23988-cc-w33 share envelope and load ratings (2506/4900 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "The 23988-cck-w33 and its cylindrical-bore counterpart 23988-cc-w33 share envelope and load ratings (2506/4900 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "The 150000 g mass and 118 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 23988-cck-w33.", "The 2506/4900 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23988 CCK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23988-cck-w33?", "a": "The SKF 23988 CCK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 440 mm nominal bore, 600 mm outer diameter and 118 mm width (17.323 × 23.622 × 4.646 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 2506 kN, C0 4900 kN, Pu 345 kN, reference speed 950 r/min, limiting speed 1,000 r/min, mass about 150000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23988-cck-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23988-cck-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 440 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23988-cck-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23988-cck-w33 and 23988-cc-w33?", "a": "They share the ISO 15 envelope and the same 2506/4900 kN ratings, but 23988-cck-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23988-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23988-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 440×600×118 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "23988", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23988; identical ISO 15 envelope, fits OH3988 adapter sleeve on a 410 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23988-CCK-W33", "SKF 23988 CCK/W33", "23988 K" ], "locale_variants": {} }, { "sku": "23188-CAK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23188 CAK/W33", "series": "23100-series", "type": "spherical_roller", "d_mm": 440, "D_mm": 720, "B_mm": 226, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass_machined_M1", "dynamic_load_kN": 6215, "static_load_kN": 10000, "fatigue_load_limit_kN": 670, "max_rpm": 850, "reference_speed_rpm": 450, "limiting_speed_rpm": 850, "weight_g": 430000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "23188-cak-w33 is the 1:12 tapered-bore execution of the 23100-series spherical roller bearing: the same two barrel-roller rows on a sphered outer raceway as 23188-cak-w33, but the inner-ring bore tapers 1 mm per 12 mm for adapter- or withdrawal-sleeve mounting, as listed by SKF in SKF catalogue PUB BU/P1 17000. Numbering ties the bearing to its envelope: 23188-cak-w33 means spherical-roller type, dimension series 31, 440 mm bore — which is why the 720×226 mm outline swaps dimensionally with other ISO 15 bearings of the same code. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. The 140.0 mm radial section height ((720−440)/2) and 430000 g catalogue mass frame a 440 mm bore bearing rated at 6215 kN C — roughly 14.13 kN of dynamic capacity per millimetre of bore before application factors. Over-driving the 23188-cak-w33 up its sleeve pinches radial clearance below the residual minimum and can crack the inner ring in service; under-driving leaves the sleeve seat loose, so the ring creeps and frets the sleeve — measure, do not estimate.", "applications": [ "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals" ], "pitfalls": [ "At 440 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23100-series series at 440 mm bore (720×226 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.", "The 23188-cak-w33 and its cylindrical-bore counterpart 23188-cak-w33 share envelope and load ratings (6215/10000 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 226 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 23188-cak-w33 pits long before its L10 life.", "The 6215/10000 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23188 CAK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23188-cak-w33?", "a": "The SKF 23188 CAK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 440 mm nominal bore, 720 mm outer diameter and 226 mm width (17.323 × 28.346 × 8.898 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 6215 kN, C0 10000 kN, Pu 670 kN, reference speed 450 r/min, limiting speed 850 r/min, mass about 430000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23188-cak-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23188-cak-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 440 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23188-cak-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23188-cak-w33 and 23188-cak-w33?", "a": "They share the ISO 15 envelope and the same 6215/10000 kN ratings, but 23188-cak-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23188-cak-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23188", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23188; identical ISO 15 envelope, fits OH3188 adapter sleeve on a 410 mm shaft." }, { "equiv_sku": "C3188-MB", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 3188 MB shares the 440×720×226 mm envelope but catalogue C/C0 differ (6700/11400 kN vs 6215/10000 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C3188-KMB", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 3188 KMB shares the 440×720×226 mm envelope but catalogue C/C0 differ (6700/11400 kN vs 6215/10000 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23188-CAK-W33", "SKF 23188 CAK/W33", "23188 K" ], "locale_variants": {} }, { "sku": "23288-CAK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23288 CAK/W33", "series": "23200-series", "type": "spherical_roller", "d_mm": 440, "D_mm": 790, "B_mm": 280, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass_machined_M1", "dynamic_load_kN": 8150, "static_load_kN": 12500, "fatigue_load_limit_kN": 800, "max_rpm": 600, "reference_speed_rpm": 430, "limiting_speed_rpm": 600, "weight_g": 670000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "23288-cak-w33 is the 1:12 tapered-bore execution of the 23200-series spherical roller bearing: the same two barrel-roller rows on a sphered outer raceway as 23288-cak-w33, but the inner-ring bore tapers 1 mm per 12 mm for adapter- or withdrawal-sleeve mounting, as listed by SKF in SKF catalogue PUB BU/P1 17000. On the SKF nameplate, 23288-cak-w33 follows the ISO 15 convention: 2 for the spherical roller type, 32 for the dimension series 32 (medium OD, extra wide), final digits 88 for the 440 mm bore. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. Speed planning uses two different ceilings: 430 r/min thermal reference and 600 r/min mechanical limiting speed. After drive-up, re-check radial clearance and then swing the outer ring through its self-aligning range: the sphered raceway of the 23288-cak-w33 must still tilt ≈ 0.5–2.5° freely — a joint that binds after sleeve mounting signals excessive drive-up or a cocked sleeve.", "applications": [ "large mining crusher main shafts", "wind-turbine main shaft support", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat", "split-housing plummer block arrangements with bearings swapped in situ" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "At 440 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23200-series series at 440 mm bore (790×280 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 280 mm width changes abutment spacing, even though the 790 mm OD matches.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 280 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23288-cak-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "Shaft and housing fillets must clear the bearing chamfer so the 280 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 8150/12500 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23288 CAK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23288-cak-w33?", "a": "The SKF 23288 CAK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 440 mm nominal bore, 790 mm outer diameter and 280 mm width (17.323 × 31.102 × 11.024 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 8150 kN, C0 12500 kN, Pu 800 kN, reference speed 430 r/min, limiting speed 600 r/min, mass about 670000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23288-cak-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23288-cak-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 440 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23288-cak-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23288-cak-w33 and 23288-cak-w33?", "a": "They share the ISO 15 envelope and the same 8150/12500 kN ratings, but 23288-cak-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23288-cak-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23288", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23288; identical ISO 15 envelope, fits OH3288 adapter sleeve on a 410 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23288-CAK-W33", "SKF 23288 CAK/W33", "23288 K" ], "locale_variants": {} }, { "sku": "23992-CAK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23992 CAK/W33", "series": "23900-series", "type": "spherical_roller", "d_mm": 460, "D_mm": 620, "B_mm": 118, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass_machined_M1", "dynamic_load_kN": 2558, "static_load_kN": 5000, "fatigue_load_limit_kN": 355, "max_rpm": 1000, "reference_speed_rpm": 600, "limiting_speed_rpm": 1000, "weight_g": 160000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF lists SKF 23992 CAK/W33 as the adapter-sleeve execution in the 23900-series range: a 460 mm nominal-bore spherical roller bearing whose 1:12 tapered inner ring is driven up a sleeve, with 620 mm OD and 118 mm width to the ISO 15 envelope. Digit by digit, 23992-cak-w33 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 39, and bore reference 92 resolving to 460 mm; 620 mm OD and 118 mm width are the matching ISO 15 boundary values. Sleeve mounting is why the K execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. At 600 r/min reference speed the 80.0 mm-section 23992-cak-w33 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 1,000 r/min as the mechanical ceiling. After drive-up, re-check radial clearance and then swing the outer ring through its self-aligning range: the sphered raceway of the 23992-cak-w33 must still tilt ≈ 0.5–2.5° freely — a joint that binds after sleeve mounting signals excessive drive-up or a cocked sleeve.", "applications": [ "large induced-draft fan rotors", "SAG and ball-mill drive shafts", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still" ], "pitfalls": [ "At 460 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23900-series series at 460 mm bore (620×118 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23992-cak-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23992-cak-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "The 23992-cak-w33 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 2558/5000 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The 2558/5000 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23992 CAK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23992-cak-w33?", "a": "The SKF 23992 CAK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 460 mm nominal bore, 620 mm outer diameter and 118 mm width (18.11 × 24.409 × 4.646 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 2558 kN, C0 5000 kN, Pu 355 kN, reference speed 600 r/min, limiting speed 1,000 r/min, mass about 160000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23992-cak-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23992-cak-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 460 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23992-cak-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23992-cak-w33 and 23992-cak-w33?", "a": "They share the ISO 15 envelope and the same 2558/5000 kN ratings, but 23992-cak-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23992-cak-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23992-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "23992", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23992; identical ISO 15 envelope, fits OH3992 adapter sleeve on a 430 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23992-CAK-W33", "SKF 23992 CAK/W33", "23992 K" ], "locale_variants": {} }, { "sku": "23192-CAK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23192 CAK/W33", "series": "23100-series", "type": "spherical_roller", "d_mm": 460, "D_mm": 760, "B_mm": 240, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass_machined_M1", "dynamic_load_kN": 6760, "static_load_kN": 10800, "fatigue_load_limit_kN": 680, "max_rpm": 800, "reference_speed_rpm": 430, "limiting_speed_rpm": 800, "weight_g": 530000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 23192-cak-w33 denotes the tapered-bore version (K suffix, taper 1:12) of the 23100-series spherical roller bearing: dimensioned 460×760×240 mm, it seats on an adapter or withdrawal sleeve rather than directly on a machined journal. Reading the designation: the leading 2 marks a spherical roller bearing, the 31 is the ISO 15 dimension series (dimension series 31 (medium OD, wide)), and the last two digits encode the 460 mm bore; the 760 mm OD and 240 mm width follow the ISO 15 general plan. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. The 680 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.60 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. Because driving up the 1:12 taper consumes radial clearance, K executions are commonly ordered with C3 initial clearance so the residual running clearance after mounting matches the cylindrical-bore 23192-cak-w33 on an interference seat.", "applications": [ "steel-plant continuous-caster segments", "large induced-draft fan rotors", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder", "fan and pulley shafts that need periodic bearing removal in the field" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "At 460 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23100-series series at 460 mm bore (760×240 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.", "The adapter sleeve is selected by actual shaft diameter, not by the 460 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23192-cak-w33 with different sleeves.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23192-cak-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 6760/10800 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23192 CAK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23192-cak-w33?", "a": "The SKF 23192 CAK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 460 mm nominal bore, 760 mm outer diameter and 240 mm width (18.11 × 29.921 × 9.449 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 6760 kN, C0 10800 kN, Pu 680 kN, reference speed 430 r/min, limiting speed 800 r/min, mass about 530000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23192-cak-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23192-cak-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 460 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23192-cak-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23192-cak-w33 and 23192-cak-w33?", "a": "They share the ISO 15 envelope and the same 6760/10800 kN ratings, but 23192-cak-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23192-cak-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23192", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23192; identical ISO 15 envelope, fits OH3192 adapter sleeve on a 430 mm shaft." }, { "equiv_sku": "C3192-M", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 3192 M shares the 460×760×240 mm envelope but catalogue C/C0 differ (6800/12000 kN vs 6760/10800 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C3192-KM", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 3192 KM shares the 460×760×240 mm envelope but catalogue C/C0 differ (6800/12000 kN vs 6760/10800 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23192-CAK-W33", "SKF 23192 CAK/W33", "23192 K" ], "locale_variants": {} }, { "sku": "23292-CAK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23292 CAK/W33", "series": "23200-series", "type": "spherical_roller", "d_mm": 460, "D_mm": 830, "B_mm": 296, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass_machined_M1", "dynamic_load_kN": 8958, "static_load_kN": 13700, "fatigue_load_limit_kN": 880, "max_rpm": 560, "reference_speed_rpm": 400, "limiting_speed_rpm": 560, "weight_g": 790000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF lists SKF 23292 CAK/W33 as the adapter-sleeve execution in the 23200-series range: a 460 mm nominal-bore spherical roller bearing whose 1:12 tapered inner ring is driven up a sleeve, with 830 mm OD and 296 mm width to the ISO 15 envelope. Digit by digit, 23292-cak-w33 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 32, and bore reference 92 resolving to 460 mm; 830 mm OD and 296 mm width are the matching ISO 15 boundary values. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. With C 8958 kN and C0 13700 kN, the 23292-cak-w33 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. At 460 mm bore, dismount after service is by KM locknut reversal or a hydraulic nut on larger sizes; oil-injection grooves on the bigger sleeves let pressurised oil float the 23292-cak-w33 off the taper without scoring either surface.", "applications": [ "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "At 460 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23200-series series at 460 mm bore (830×296 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 296 mm width changes abutment spacing, even though the 830 mm OD matches.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23292-cak-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "The adapter sleeve is selected by actual shaft diameter, not by the 460 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23292-cak-w33 with different sleeves.", "Shaft and housing fillets must clear the bearing chamfer so the 296 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 8958/13700 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23292 CAK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23292-cak-w33?", "a": "The SKF 23292 CAK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 460 mm nominal bore, 830 mm outer diameter and 296 mm width (18.11 × 32.677 × 11.654 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 8958 kN, C0 13700 kN, Pu 880 kN, reference speed 400 r/min, limiting speed 560 r/min, mass about 790000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23292-cak-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23292-cak-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 460 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23292-cak-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23292-cak-w33 and 23292-cak-w33?", "a": "They share the ISO 15 envelope and the same 8958/13700 kN ratings, but 23292-cak-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23292-cak-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23292", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23292; identical ISO 15 envelope, fits OH3292 adapter sleeve on a 430 mm shaft." }, { "equiv_sku": "C3292-MB", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3292 MB shares the 460×830×296 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C3292-KMB", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3292 KMB shares the 460×830×296 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23292-CAK-W33", "SKF 23292 CAK/W33", "23292 K" ], "locale_variants": {} }, { "sku": "23996-CAK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23996 CAK/W33", "series": "23900-series", "type": "spherical_roller", "d_mm": 480, "D_mm": 650, "B_mm": 128, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass_machined_M1", "dynamic_load_kN": 2990, "static_load_kN": 5700, "fatigue_load_limit_kN": 405, "max_rpm": 1000, "reference_speed_rpm": 560, "limiting_speed_rpm": 1000, "weight_g": 185000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For sleeve mounting on a 480 mm shaft, SKF order number SKF 23996 CAK/W33 is the 1:12 tapered-bore spherical roller bearing in the 23900-series family (dimension series 39 (compact OD, narrow)); the cylindrical-bore equivalent is a separate order number, 23996-cak-w33. Reading the designation: the leading 2 marks a spherical roller bearing, the 39 is the ISO 15 dimension series (dimension series 39 (compact OD, narrow)), and the last two digits encode the 480 mm bore; the 650 mm OD and 128 mm width follow the ISO 15 general plan. Note that K means 1:12 taper; the rarer K30 suffix means 1:30. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. The 405 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.91 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. For shafts with a locating shoulder, use an AH withdrawal sleeve instead of an adapter sleeve: the bearing presses against the shoulder and the sleeve is drawn out for dismounting, making the 23996-cak-w33 removable without an induction heater.", "applications": [ "steel-plant continuous-caster segments", "large induced-draft fan rotors", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat", "split-housing plummer block arrangements with bearings swapped in situ" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals" ], "pitfalls": [ "At 480 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23900-series series at 480 mm bore (650×128 mm) is the slim-OD envelope: it buys radial space but gives up capacity against a 222-series bearing of the same bore — confirm the L10 margin before downsizing into it.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23996-cak-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23996-cak-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "The 23996-cak-w33 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 2990/5700 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The 2990/5700 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23996 CAK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23996-cak-w33?", "a": "The SKF 23996 CAK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 480 mm nominal bore, 650 mm outer diameter and 128 mm width (18.898 × 25.591 × 5.039 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 2990 kN, C0 5700 kN, Pu 405 kN, reference speed 560 r/min, limiting speed 1,000 r/min, mass about 185000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23996-cak-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23996-cak-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 480 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23996-cak-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23996-cak-w33 and 23996-cak-w33?", "a": "They share the ISO 15 envelope and the same 2990/5700 kN ratings, but 23996-cak-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23996-cak-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23996-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 480×650×128 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "23996", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23996; identical ISO 15 envelope, fits OH3996 adapter sleeve on a 450 mm shaft." }, { "equiv_sku": "C3996-M", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3996 M shares the 480×650×128 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23996-CAK-W33", "SKF 23996 CAK/W33", "23996 K" ], "locale_variants": {} }, { "sku": "23196-CAK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23196 CAK/W33", "series": "23100-series", "type": "spherical_roller", "d_mm": 480, "D_mm": 790, "B_mm": 248, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass_machined_M1", "dynamic_load_kN": 7362, "static_load_kN": 12000, "fatigue_load_limit_kN": 780, "max_rpm": 750, "reference_speed_rpm": 400, "limiting_speed_rpm": 750, "weight_g": 590000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF lists SKF 23196 CAK/W33 as the adapter-sleeve execution in the 23100-series range: a 480 mm nominal-bore spherical roller bearing whose 1:12 tapered inner ring is driven up a sleeve, with 790 mm OD and 248 mm width to the ISO 15 envelope. The code breaks down as type digit 2 (double-row spherical roller), dimension series 31 (dimension series 31 (medium OD, wide)), and bore code 96 = 480 mm; dimensions 480×790×248 mm therefore match the ISO 15 envelope. The K in the designation marks the 1:12 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. Catalogue mass 590000 g for the 480×790×248 mm open execution covers the a one-piece machined brass cage guided on the inner ring (CA design); tapered-bore and sealed variants differ in mass and carry their own order numbers. At 480 mm bore, dismount after service is by KM locknut reversal or a hydraulic nut on larger sizes; oil-injection grooves on the bigger sleeves let pressurised oil float the 23196-cak-w33 off the taper without scoring either surface.", "applications": [ "large dredger and marine winch drums", "steel-plant continuous-caster segments", "split-housing plummer block arrangements with bearings swapped in situ", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 480 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23100-series series at 480 mm bore (790×248 mm) is the medium-OD wide envelope for heavy continuous duty; it is wider than a 222 bearing in the same OD class, so housing width and spacer stack must be re-checked before substitution.", "The adapter sleeve is selected by actual shaft diameter, not by the 480 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23196-cak-w33 with different sleeves.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23196-cak-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 7362/12000 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23196 CAK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23196-cak-w33?", "a": "The SKF 23196 CAK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 480 mm nominal bore, 790 mm outer diameter and 248 mm width (18.898 × 31.102 × 9.764 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 7362 kN, C0 12000 kN, Pu 780 kN, reference speed 400 r/min, limiting speed 750 r/min, mass about 590000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23196-cak-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23196-cak-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 480 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23196-cak-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23196-cak-w33 and 23196-cak-w33?", "a": "They share the ISO 15 envelope and the same 7362/12000 kN ratings, but 23196-cak-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23196-cak-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23196", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23196; identical ISO 15 envelope, fits OH3196 adapter sleeve on a 450 mm shaft." }, { "equiv_sku": "C3196-MB", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3196 MB shares the 480×790×248 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C3196-KMB", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 3196 KMB shares the 480×790×248 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23196-CAK-W33", "SKF 23196 CAK/W33", "23196 K" ], "locale_variants": {} }, { "sku": "23296-CAK-W33", "brand": "SKF", "manufacturer_designation": "SKF 23296 CAK/W33", "series": "23200-series", "type": "spherical_roller", "d_mm": 480, "D_mm": 870, "B_mm": 310, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass_machined_M1", "dynamic_load_kN": 9805, "static_load_kN": 15000, "fatigue_load_limit_kN": 950, "max_rpm": 530, "reference_speed_rpm": 380, "limiting_speed_rpm": 530, "weight_g": 935000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For sleeve mounting on a 480 mm shaft, SKF order number SKF 23296 CAK/W33 is the 1:12 tapered-bore spherical roller bearing in the 23200-series family (dimension series 32 (medium OD, extra wide)); the cylindrical-bore equivalent is a separate order number, 23296-cak-w33. Reading the designation: the leading 2 marks a spherical roller bearing, the 32 is the ISO 15 dimension series (dimension series 32 (medium OD, extra wide)), and the last two digits encode the 480 mm bore; the 870 mm OD and 310 mm width follow the ISO 15 general plan. The K in the designation marks the 1:12 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. The 195.0 mm radial section height ((870−480)/2) and 935000 g catalogue mass frame a 480 mm bore bearing rated at 9805 kN C — roughly 20.43 kN of dynamic capacity per millimetre of bore before application factors. Over-driving the 23296-cak-w33 up its sleeve pinches radial clearance below the residual minimum and can crack the inner ring in service; under-driving leaves the sleeve seat loose, so the ring creeps and frets the sleeve — measure, do not estimate.", "applications": [ "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "fan and pulley shafts that need periodic bearing removal in the field", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 480 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 23200-series series at 480 mm bore (870×310 mm) adds still more width for shock-loaded and vibratory loads; it does not interchange with a 231 bearing of the same bore because the 310 mm width changes abutment spacing, even though the 870 mm OD matches.", "Never apply the drive-up or clearance-reduction figures for this 1:12 tapered 23296-cak-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "The adapter sleeve is selected by actual shaft diameter, not by the 480 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 23296-cak-w33 with different sleeves.", "Shaft and housing fillets must clear the bearing chamfer so the 310 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 9805/15000 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 23296 CAK/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 23296-cak-w33?", "a": "The SKF 23296 CAK/W33 is a double-row spherical roller bearing with a 1:12 tapered bore, 480 mm nominal bore, 870 mm outer diameter and 310 mm width (18.898 × 34.252 × 12.205 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 9805 kN, C0 15000 kN, Pu 950 kN, reference speed 380 r/min, limiting speed 530 r/min, mass about 935000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K suffix mean on 23296-cak-w33?", "a": "K marks a 1:12 tapered bore for sleeve mounting — SKF writes EK or CCK(/W33), FAG writes -K- inside the suffix chain for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder. The rarer K30 suffix would instead mean a 1:30 taper; dimension series 40/41 spherical rollers commonly use it." }, { "q": "Which adapter sleeve fits the 23296-cak-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 480 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 23296-cak-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:12 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 23296-cak-w33 and 23296-cak-w33?", "a": "They share the ISO 15 envelope and the same 9805/15000 kN ratings, but 23296-cak-w33 has the 1:12 tapered bore for sleeve mounting on a plain shaft, while 23296-cak-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "23296", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:12) sleeve-mounted execution of 23296; identical ISO 15 envelope, fits OH3296 adapter sleeve on a 450 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.2 adapter-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "23296-CAK-W33", "SKF 23296 CAK/W33", "23296 K" ], "locale_variants": {} }, { "sku": "24122-CCK30-W33", "brand": "SKF", "manufacturer_designation": "SKF 24122 CCK30/W33", "series": "24100-series", "type": "spherical_roller", "d_mm": 110, "D_mm": 180, "B_mm": 69, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 539, "static_load_kN": 750, "fatigue_load_limit_kN": 78, "max_rpm": 3000, "reference_speed_rpm": 2000, "limiting_speed_rpm": 3000, "weight_g": 7700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "24122-cck30-w33 is the 1:30 tapered-bore execution of the 24100-series spherical roller bearing: the same two barrel-roller rows on a sphered outer raceway as 24122-cc-w33, but the inner-ring bore tapers 1 mm per 30 mm for adapter- or withdrawal-sleeve mounting, as listed by SKF in SKF catalogue PUB BU/P1 17000. Reading the designation: the leading 2 marks a spherical roller bearing, the 41 is the ISO 15 dimension series (dimension series 41 (medium OD, maximum width)), and the last two digits encode the 110 mm bore; the 180 mm OD and 69 mm width follow the ISO 15 general plan. The K30 in the designation marks the 1:30 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. At 2,000 r/min reference speed the 35.0 mm-section 24122-cck30-w33 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 3,000 r/min as the mechanical ceiling. At 110 mm bore, dismount after service is by KM locknut reversal or a hydraulic nut on larger sizes; oil-injection grooves on the bigger sleeves let pressurised oil float the 24122-cck30-w33 off the taper without scoring either surface.", "applications": [ "heavy conveyor head shafts in mining", "jaw and cone crusher main shafts", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems" ], "pitfalls": [ "Mount the 110 mm bore 24122-cck30-w33 by induction heating (max 120 °C) or oil injection — driving a bearing of this section home through the rollers brinells both raceways, and the damage only speaks up as vibration hours later.", "The 24100-series series at 110 mm bore (180×69 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 3,000 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.", "The 24122-cck30-w33 and its cylindrical-bore counterpart 24122-cc-w33 share envelope and load ratings (539/750 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "The 24122-cck30-w33 and its cylindrical-bore counterpart 24122-cc-w33 share envelope and load ratings (539/750 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "The 7700 g mass and 69 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 24122-cck30-w33.", "The 539/750 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 24122 CCK30/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24122-cck30-w33?", "a": "The SKF 24122 CCK30/W33 is a double-row spherical roller bearing with a 1:30 tapered bore, 110 mm nominal bore, 180 mm outer diameter and 69 mm width (4.331 × 7.087 × 2.717 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 539 kN, C0 750 kN, Pu 78 kN, reference speed 2,000 r/min, limiting speed 3,000 r/min, mass about 7700 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K30 suffix mean on 24122-cck30-w33?", "a": "K30 (written CCK30/W33 in the CC execution) marks the 1:30 tapered bore for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder." }, { "q": "Which adapter sleeve fits the 24122-cck30-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 110 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 24122-cck30-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:30 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 24122-cck30-w33 and 24122-cc-w33?", "a": "They share the ISO 15 envelope and the same 539/750 kN ratings, but 24122-cck30-w33 has the 1:30 tapered bore for sleeve mounting on a plain shaft, while 24122-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "24122", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) sleeve-mounted execution of 24122; identical ISO 15 envelope, fits AH24122 withdrawal sleeve on a 105 mm shaft." }, { "equiv_sku": "C4122-2CS5V-GEM9", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 4122-2CS5V/GEM9 shares the 110×180×69 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C4122-V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 4122 V shares the 110×180×69 mm envelope but catalogue C/C0 differ (670/1000 kN vs 539/750 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.3 withdrawal-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24122-CCK30-W33", "SKF 24122 CCK30/W33", "24122 K" ], "locale_variants": {} }, { "sku": "24024-CCK30-W33", "brand": "SKF", "manufacturer_designation": "SKF 24024 CCK30/W33", "series": "24000-series", "type": "spherical_roller", "d_mm": 120, "D_mm": 180, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 456, "static_load_kN": 670, "fatigue_load_limit_kN": 68, "max_rpm": 3400, "reference_speed_rpm": 2400, "limiting_speed_rpm": 3400, "weight_g": 5950, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For sleeve mounting on a 120 mm shaft, SKF order number SKF 24024 CCK30/W33 is the 1:30 tapered-bore spherical roller bearing in the 24000-series family (dimension series 40 (compact OD, maximum width)); the cylindrical-bore equivalent is a separate order number, 24024-cc-w33. Reading the designation: the leading 2 marks a spherical roller bearing, the 40 is the ISO 15 dimension series (dimension series 40 (compact OD, maximum width)), and the last two digits encode the 120 mm bore; the 180 mm OD and 60 mm width follow the ISO 15 general plan. The K30 in the designation marks the 1:30 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. The 30.0 mm radial section height ((180−120)/2) and 5950 g catalogue mass frame a 120 mm bore bearing rated at 456 kN C — roughly 3.80 kN of dynamic capacity per millimetre of bore before application factors. For shafts with a locating shoulder, use an AH withdrawal sleeve instead of an adapter sleeve: the bearing presses against the shoulder and the sleeve is drawn out for dismounting, making the 24024-cck30-w33 removable without an induction heater.", "applications": [ "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "split-housing plummer block arrangements with bearings swapped in situ", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 120 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24000-series series at 120 mm bore (180×60 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.", "The adapter sleeve is selected by actual shaft diameter, not by the 120 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 24024-cck30-w33 with different sleeves.", "The adapter sleeve is selected by actual shaft diameter, not by the 120 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 24024-cck30-w33 with different sleeves.", "The 5950 g mass and 60 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 24024-cck30-w33.", "The 456/670 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 24024 CCK30/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24024-cck30-w33?", "a": "The SKF 24024 CCK30/W33 is a double-row spherical roller bearing with a 1:30 tapered bore, 120 mm nominal bore, 180 mm outer diameter and 60 mm width (4.724 × 7.087 × 2.362 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 456 kN, C0 670 kN, Pu 68 kN, reference speed 2,400 r/min, limiting speed 3,400 r/min, mass about 5950 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K30 suffix mean on 24024-cck30-w33?", "a": "K30 (written CCK30/W33 in the CC execution) marks the 1:30 tapered bore for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder." }, { "q": "Which adapter sleeve fits the 24024-cck30-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 120 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 24024-cck30-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:30 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 24024-cck30-w33 and 24024-cc-w33?", "a": "They share the ISO 15 envelope and the same 456/670 kN ratings, but 24024-cck30-w33 has the 1:30 tapered bore for sleeve mounting on a plain shaft, while 24024-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "24024", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) sleeve-mounted execution of 24024; identical ISO 15 envelope, fits AH24024 withdrawal sleeve on a 115 mm shaft." }, { "equiv_sku": "C4024-2CS5V-GEM9", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 4024-2CS5V/GEM9 shares the 120×180×60 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C4024-V-VE240", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 4024 V/VE240 shares the 120×180×60 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C4024-K30V-VE240", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 4024 K30V/VE240 shares the 120×180×60 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C4024-V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 4024 V shares the 120×180×60 mm envelope but catalogue C/C0 differ (530/880 kN vs 456/670 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C4024-K30V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 4024 K30V shares the 120×180×60 mm envelope but catalogue C/C0 differ (530/880 kN vs 456/670 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.3 withdrawal-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24024-CCK30-W33", "SKF 24024 CCK30/W33", "24024 K" ], "locale_variants": {} }, { "sku": "24124-CCK30-W33", "brand": "SKF", "manufacturer_designation": "SKF 24124 CCK30/W33", "series": "24100-series", "type": "spherical_roller", "d_mm": 120, "D_mm": 200, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 679, "static_load_kN": 950, "fatigue_load_limit_kN": 95, "max_rpm": 2600, "reference_speed_rpm": 1900, "limiting_speed_rpm": 2600, "weight_g": 11000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 24124-cck30-w33 denotes the tapered-bore version (K30 suffix, taper 1:30) of the 24100-series spherical roller bearing: dimensioned 120×200×80 mm, it seats on an adapter or withdrawal sleeve rather than directly on a machined journal. Numbering ties the bearing to its envelope: 24124-cck30-w33 means spherical-roller type, dimension series 41, 120 mm bore — which is why the 200×80 mm outline swaps dimensionally with other ISO 15 bearings of the same code. Reading the suffix on 24124-cck30-w33, the K30 (or EK/CCK30) element changes only the bore — 1:30 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 24124-cc-w33. With C 679 kN and C0 950 kN, the 24124-cck30-w33 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. On an H adapter sleeve the 120 mm shaft seat only needs an h9 plain journal; slide the sleeve into the 24124-cck30-w33 inner ring, tighten the KM nut against the MB washer until the catalogue clearance-reduction value is reached, then lock the washer tab.", "applications": [ "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat", "split-housing plummer block arrangements with bearings swapped in situ" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "smearing on the roller-raceway contact during skid starts below the minimum load" ], "pitfalls": [ "At 120 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24100-series series at 120 mm bore (200×80 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 2,600 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.", "The adapter sleeve is selected by actual shaft diameter, not by the 120 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 24124-cck30-w33 with different sleeves.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 80 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "Shaft and housing fillets must clear the bearing chamfer so the 80 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 679/950 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 24124 CCK30/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24124-cck30-w33?", "a": "The SKF 24124 CCK30/W33 is a double-row spherical roller bearing with a 1:30 tapered bore, 120 mm nominal bore, 200 mm outer diameter and 80 mm width (4.724 × 7.874 × 3.15 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 679 kN, C0 950 kN, Pu 95 kN, reference speed 1,900 r/min, limiting speed 2,600 r/min, mass about 11000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K30 suffix mean on 24124-cck30-w33?", "a": "K30 (written CCK30/W33 in the CC execution) marks the 1:30 tapered bore for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder." }, { "q": "Which adapter sleeve fits the 24124-cck30-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 120 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 24124-cck30-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:30 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 24124-cck30-w33 and 24124-cc-w33?", "a": "They share the ISO 15 envelope and the same 679/950 kN ratings, but 24124-cck30-w33 has the 1:30 tapered bore for sleeve mounting on a plain shaft, while 24124-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "24124", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) sleeve-mounted execution of 24124; identical ISO 15 envelope, fits AH24124 withdrawal sleeve on a 115 mm shaft." }, { "equiv_sku": "C4124-V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 4124 V shares the 120×200×80 mm envelope but catalogue C/C0 differ (780/1120 kN vs 679/950 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.3 withdrawal-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24124-CCK30-W33", "SKF 24124 CCK30/W33", "24124 K" ], "locale_variants": {} }, { "sku": "24026-CCK30-W33", "brand": "SKF", "manufacturer_designation": "SKF 24026 CCK30/W33", "series": "24000-series", "type": "spherical_roller", "d_mm": 130, "D_mm": 200, "B_mm": 69, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 569, "static_load_kN": 815, "fatigue_load_limit_kN": 81.5, "max_rpm": 3000, "reference_speed_rpm": 2000, "limiting_speed_rpm": 3000, "weight_g": 8650, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF 24026 CCK30/W33 in SKF catalogue PUB BU/P1 17000 is a double-row spherical roller bearing with a tapered bore (1:30), intended for an H-series adapter sleeve or AH withdrawal sleeve, with two pressed-steel cages with a floating guide ring and the same 130×200×69 mm ISO 15 outline as its cylindrical-bore counterpart. Reading the designation: the leading 2 marks a spherical roller bearing, the 40 is the ISO 15 dimension series (dimension series 40 (compact OD, maximum width)), and the last two digits encode the 130 mm bore; the 200 mm OD and 69 mm width follow the ISO 15 general plan. The K30 in the designation marks the 1:30 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. The 81.5 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.43 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. At 130 mm bore, dismount after service is by KM locknut reversal or a hydraulic nut on larger sizes; oil-injection grooves on the bigger sleeves let pressurised oil float the 24026-cck30-w33 off the taper without scoring either surface.", "applications": [ "steel-plant continuous-caster segments", "large induced-draft fan rotors", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems" ], "pitfalls": [ "At 130 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24000-series series at 130 mm bore (200×69 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 69 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "Never apply the drive-up or clearance-reduction figures for this 1:30 tapered 24026-cck30-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "Shaft and housing fillets must clear the bearing chamfer so the 69 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 569/815 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 24026 CCK30/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24026-cck30-w33?", "a": "The SKF 24026 CCK30/W33 is a double-row spherical roller bearing with a 1:30 tapered bore, 130 mm nominal bore, 200 mm outer diameter and 69 mm width (5.118 × 7.874 × 2.717 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 569 kN, C0 815 kN, Pu 81.5 kN, reference speed 2,000 r/min, limiting speed 3,000 r/min, mass about 8650 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K30 suffix mean on 24026-cck30-w33?", "a": "K30 (written CCK30/W33 in the CC execution) marks the 1:30 tapered bore for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder." }, { "q": "Which adapter sleeve fits the 24026-cck30-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 130 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 24026-cck30-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:30 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 24026-cck30-w33 and 24026-cc-w33?", "a": "They share the ISO 15 envelope and the same 569/815 kN ratings, but 24026-cck30-w33 has the 1:30 tapered bore for sleeve mounting on a plain shaft, while 24026-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "24026", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) sleeve-mounted execution of 24026; identical ISO 15 envelope, fits AH24026 withdrawal sleeve on a 125 mm shaft." }, { "equiv_sku": "C4026-2CS5V-GEM9", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 4026-2CS5V/GEM9 shares the 130×200×69 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C4026", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 4026 shares the 130×200×69 mm envelope but catalogue C/C0 differ (620/930 kN vs 569/815 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C4026-K30", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 4026 K30 shares the 130×200×69 mm envelope but catalogue C/C0 differ (620/930 kN vs 569/815 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C4026-V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 4026 V shares the 130×200×69 mm envelope but catalogue C/C0 differ (720/1120 kN vs 569/815 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C4026-K30V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 4026 K30V shares the 130×200×69 mm envelope but catalogue C/C0 differ (720/1120 kN vs 569/815 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.3 withdrawal-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24026-CCK30-W33", "SKF 24026 CCK30/W33", "24026 K" ], "locale_variants": {} }, { "sku": "24126-CCK30-W33", "brand": "SKF", "manufacturer_designation": "SKF 24126 CCK30/W33", "series": "24100-series", "type": "spherical_roller", "d_mm": 130, "D_mm": 210, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 699, "static_load_kN": 1000, "fatigue_load_limit_kN": 100, "max_rpm": 2400, "reference_speed_rpm": 1700, "limiting_speed_rpm": 2400, "weight_g": 11500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF lists SKF 24126 CCK30/W33 as the adapter-sleeve execution in the 24100-series range: a 130 mm nominal-bore spherical roller bearing whose 1:30 tapered inner ring is driven up a sleeve, with 210 mm OD and 80 mm width to the ISO 15 envelope. Numbering ties the bearing to its envelope: 24126-cck30-w33 means spherical-roller type, dimension series 41, 130 mm bore — which is why the 210×80 mm outline swaps dimensionally with other ISO 15 bearings of the same code. Reading the suffix on 24126-cck30-w33, the K30 (or EK/CCK30) element changes only the bore — 1:30 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 24126-cc-w33. At 1,700 r/min reference speed the 40.0 mm-section 24126-cck30-w33 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 2,400 r/min as the mechanical ceiling. Over-driving the 24126-cck30-w33 up its sleeve pinches radial clearance below the residual minimum and can crack the inner ring in service; under-driving leaves the sleeve seat loose, so the ring creeps and frets the sleeve — measure, do not estimate.", "applications": [ "large induced-draft fan rotors", "SAG and ball-mill drive shafts", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "At 130 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24100-series series at 130 mm bore (210×80 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 2,400 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 80 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "The adapter sleeve is selected by actual shaft diameter, not by the 130 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 24126-cck30-w33 with different sleeves.", "The 24126-cck30-w33 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 699/1000 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The 699/1000 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 24126 CCK30/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24126-cck30-w33?", "a": "The SKF 24126 CCK30/W33 is a double-row spherical roller bearing with a 1:30 tapered bore, 130 mm nominal bore, 210 mm outer diameter and 80 mm width (5.118 × 8.268 × 3.15 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 699 kN, C0 1000 kN, Pu 100 kN, reference speed 1,700 r/min, limiting speed 2,400 r/min, mass about 11500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K30 suffix mean on 24126-cck30-w33?", "a": "K30 (written CCK30/W33 in the CC execution) marks the 1:30 tapered bore for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder." }, { "q": "Which adapter sleeve fits the 24126-cck30-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 130 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 24126-cck30-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:30 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 24126-cck30-w33 and 24126-cc-w33?", "a": "They share the ISO 15 envelope and the same 699/1000 kN ratings, but 24126-cck30-w33 has the 1:30 tapered bore for sleeve mounting on a plain shaft, while 24126-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "24126", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) sleeve-mounted execution of 24126; identical ISO 15 envelope, fits AH24126 withdrawal sleeve on a 125 mm shaft." }, { "equiv_sku": "C4126-2CS5V-GEM9", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 4126-2CS5V/GEM9 shares the 130×210×80 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.3 withdrawal-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24126-CCK30-W33", "SKF 24126 CCK30/W33", "24126 K" ], "locale_variants": {} }, { "sku": "24028-CCK30-W33", "brand": "SKF", "manufacturer_designation": "SKF 24028 CCK30/W33", "series": "24000-series", "type": "spherical_roller", "d_mm": 140, "D_mm": 210, "B_mm": 69, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 600, "static_load_kN": 900, "fatigue_load_limit_kN": 88, "max_rpm": 2800, "reference_speed_rpm": 2000, "limiting_speed_rpm": 2800, "weight_g": 9200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The SKF 24028 CCK30/W33 is a 140×210×69 mm spherical roller bearing with a 1:30 tapered bore — SKF catalogue execution for sleeve mounting on a 140 mm plain shaft, retaining the double-row self-aligning barrel-roller design. Numbering ties the bearing to its envelope: 24028-cck30-w33 means spherical-roller type, dimension series 40, 140 mm bore — which is why the 210×69 mm outline swaps dimensionally with other ISO 15 bearings of the same code. Reading the suffix on 24028-cck30-w33, the K30 (or EK/CCK30) element changes only the bore — 1:30 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 24028-cc-w33. The 35.0 mm radial section height ((210−140)/2) and 9200 g catalogue mass frame a 140 mm bore bearing rated at 600 kN C — roughly 4.29 kN of dynamic capacity per millimetre of bore before application factors. On an H adapter sleeve the 140 mm shaft seat only needs an h9 plain journal; slide the sleeve into the 24028-cck30-w33 inner ring, tighten the KM nut against the MB washer until the catalogue clearance-reduction value is reached, then lock the washer tab.", "applications": [ "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat", "split-housing plummer block arrangements with bearings swapped in situ" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "smearing on the roller-raceway contact during skid starts below the minimum load" ], "pitfalls": [ "At 140 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24000-series series at 140 mm bore (210×69 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.", "Never apply the drive-up or clearance-reduction figures for this 1:30 tapered 24028-cck30-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "The 24028-cck30-w33 and its cylindrical-bore counterpart 24028-cc-w33 share envelope and load ratings (600/900 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "The 24028-cck30-w33 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 600/900 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The 600/900 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 24028 CCK30/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24028-cck30-w33?", "a": "The SKF 24028 CCK30/W33 is a double-row spherical roller bearing with a 1:30 tapered bore, 140 mm nominal bore, 210 mm outer diameter and 69 mm width (5.512 × 8.268 × 2.717 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 600 kN, C0 900 kN, Pu 88 kN, reference speed 2,000 r/min, limiting speed 2,800 r/min, mass about 9200 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K30 suffix mean on 24028-cck30-w33?", "a": "K30 (written CCK30/W33 in the CC execution) marks the 1:30 tapered bore for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder." }, { "q": "Which adapter sleeve fits the 24028-cck30-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 140 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 24028-cck30-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:30 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 24028-cck30-w33 and 24028-cc-w33?", "a": "They share the ISO 15 envelope and the same 600/900 kN ratings, but 24028-cck30-w33 has the 1:30 tapered bore for sleeve mounting on a plain shaft, while 24028-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "24028", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) sleeve-mounted execution of 24028; identical ISO 15 envelope, fits AH24028 withdrawal sleeve on a 135 mm shaft." }, { "equiv_sku": "C4028-V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 4028 V shares the 140×210×69 mm envelope but catalogue C/C0 differ (750/1220 kN vs 600/900 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C4028-K30V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 4028 K30V shares the 140×210×69 mm envelope but catalogue C/C0 differ (750/1220 kN vs 600/900 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.3 withdrawal-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24028-CCK30-W33", "SKF 24028 CCK30/W33", "24028 K" ], "locale_variants": {} }, { "sku": "24128-CCK30-W33", "brand": "SKF", "manufacturer_designation": "SKF 24128 CCK30/W33", "series": "24100-series", "type": "spherical_roller", "d_mm": 140, "D_mm": 225, "B_mm": 85, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 796, "static_load_kN": 1160, "fatigue_load_limit_kN": 112, "max_rpm": 2200, "reference_speed_rpm": 1600, "limiting_speed_rpm": 2200, "weight_g": 14500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF 24128 CCK30/W33 in SKF catalogue PUB BU/P1 17000 is a double-row spherical roller bearing with a tapered bore (1:30), intended for an H-series adapter sleeve or AH withdrawal sleeve, with two pressed-steel cages with a floating guide ring and the same 140×225×85 mm ISO 15 outline as its cylindrical-bore counterpart. The code breaks down as type digit 2 (double-row spherical roller), dimension series 41 (dimension series 41 (medium OD, maximum width)), and bore code 28 = 140 mm; dimensions 140×225×85 mm therefore match the ISO 15 envelope. Sleeve mounting is why the K30 execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. With C 796 kN and C0 1160 kN, the 24128-cck30-w33 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. Because driving up the 1:30 taper consumes radial clearance, K30 executions are commonly ordered with C3 initial clearance so the residual running clearance after mounting matches the cylindrical-bore 24128-cc-w33 on an interference seat.", "applications": [ "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "fan and pulley shafts that need periodic bearing removal in the field", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still" ], "pitfalls": [ "At 140 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24100-series series at 140 mm bore (225×85 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 2,200 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.", "Never apply the drive-up or clearance-reduction figures for this 1:30 tapered 24128-cck30-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "Never apply the drive-up or clearance-reduction figures for this 1:30 tapered 24128-cck30-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 24128-cck30-w33 pits long before its L10 life.", "The 796/1160 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 24128 CCK30/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24128-cck30-w33?", "a": "The SKF 24128 CCK30/W33 is a double-row spherical roller bearing with a 1:30 tapered bore, 140 mm nominal bore, 225 mm outer diameter and 85 mm width (5.512 × 8.858 × 3.346 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 796 kN, C0 1160 kN, Pu 112 kN, reference speed 1,600 r/min, limiting speed 2,200 r/min, mass about 14500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K30 suffix mean on 24128-cck30-w33?", "a": "K30 (written CCK30/W33 in the CC execution) marks the 1:30 tapered bore for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder." }, { "q": "Which adapter sleeve fits the 24128-cck30-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 140 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 24128-cck30-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:30 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 24128-cck30-w33 and 24128-cc-w33?", "a": "They share the ISO 15 envelope and the same 796/1160 kN ratings, but 24128-cck30-w33 has the 1:30 tapered bore for sleeve mounting on a plain shaft, while 24128-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "24128", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) sleeve-mounted execution of 24128; identical ISO 15 envelope, fits AH24128 withdrawal sleeve on a 135 mm shaft." }, { "equiv_sku": "C4128-2CS5V-GEM9", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 4128-2CS5V/GEM9 shares the 140×225×85 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C4128-V-VE240", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 4128 V/VE240 shares the 140×225×85 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.3 withdrawal-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24128-CCK30-W33", "SKF 24128 CCK30/W33", "24128 K" ], "locale_variants": {} }, { "sku": "24030-CCK30-W33", "brand": "SKF", "manufacturer_designation": "SKF 24030 CCK30/W33", "series": "24000-series", "type": "spherical_roller", "d_mm": 150, "D_mm": 225, "B_mm": 75, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 680, "static_load_kN": 1040, "fatigue_load_limit_kN": 100, "max_rpm": 2600, "reference_speed_rpm": 1800, "limiting_speed_rpm": 2600, "weight_g": 11500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The SKF 24030 CCK30/W33 is a 150×225×75 mm spherical roller bearing with a 1:30 tapered bore — SKF catalogue execution for sleeve mounting on a 150 mm plain shaft, retaining the double-row self-aligning barrel-roller design. Reading the designation: the leading 2 marks a spherical roller bearing, the 40 is the ISO 15 dimension series (dimension series 40 (compact OD, maximum width)), and the last two digits encode the 150 mm bore; the 225 mm OD and 75 mm width follow the ISO 15 general plan. Reading the suffix on 24030-cck30-w33, the K30 (or EK/CCK30) element changes only the bore — 1:30 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 24030-cc-w33. The 37.5 mm radial section height ((225−150)/2) and 11500 g catalogue mass frame a 150 mm bore bearing rated at 680 kN C — roughly 4.53 kN of dynamic capacity per millimetre of bore before application factors. For shafts with a locating shoulder, use an AH withdrawal sleeve instead of an adapter sleeve: the bearing presses against the shoulder and the sleeve is drawn out for dismounting, making the 24030-cck30-w33 removable without an induction heater.", "applications": [ "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "At 150 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24000-series series at 150 mm bore (225×75 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.", "Never apply the drive-up or clearance-reduction figures for this 1:30 tapered 24030-cck30-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "The 24030-cck30-w33 and its cylindrical-bore counterpart 24030-cc-w33 share envelope and load ratings (680/1040 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "Shaft and housing fillets must clear the bearing chamfer so the 75 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 680/1040 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 24030 CCK30/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24030-cck30-w33?", "a": "The SKF 24030 CCK30/W33 is a double-row spherical roller bearing with a 1:30 tapered bore, 150 mm nominal bore, 225 mm outer diameter and 75 mm width (5.906 × 8.858 × 2.953 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 680 kN, C0 1040 kN, Pu 100 kN, reference speed 1,800 r/min, limiting speed 2,600 r/min, mass about 11500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K30 suffix mean on 24030-cck30-w33?", "a": "K30 (written CCK30/W33 in the CC execution) marks the 1:30 tapered bore for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder." }, { "q": "Which adapter sleeve fits the 24030-cck30-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 150 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 24030-cck30-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:30 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 24030-cck30-w33 and 24030-cc-w33?", "a": "They share the ISO 15 envelope and the same 680/1040 kN ratings, but 24030-cck30-w33 has the 1:30 tapered bore for sleeve mounting on a plain shaft, while 24030-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "24030", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) sleeve-mounted execution of 24030; identical ISO 15 envelope, fits AH24030 withdrawal sleeve on a 145 mm shaft." }, { "equiv_sku": "C4030-2CS5V-GEM9", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 4030-2CS5V/GEM9 shares the 150×225×75 mm envelope but catalogue C/C0 differ (585/965 kN vs 680/1040 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C4030-V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 4030 V shares the 150×225×75 mm envelope but catalogue C/C0 differ (780/1320 kN vs 680/1040 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C4030-K30V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 4030 K30V shares the 150×225×75 mm envelope but catalogue C/C0 differ (780/1320 kN vs 680/1040 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.3 withdrawal-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24030-CCK30-W33", "SKF 24030 CCK30/W33", "24030 K" ], "locale_variants": {} }, { "sku": "24130-CCK30-W33", "brand": "SKF", "manufacturer_designation": "SKF 24130 CCK30/W33", "series": "24100-series", "type": "spherical_roller", "d_mm": 150, "D_mm": 250, "B_mm": 100, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1054, "static_load_kN": 1530, "fatigue_load_limit_kN": 146, "max_rpm": 2000, "reference_speed_rpm": 1400, "limiting_speed_rpm": 2000, "weight_g": 21000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF 24130 CCK30/W33 in SKF catalogue PUB BU/P1 17000 is a double-row spherical roller bearing with a tapered bore (1:30), intended for an H-series adapter sleeve or AH withdrawal sleeve, with two pressed-steel cages with a floating guide ring and the same 150×250×100 mm ISO 15 outline as its cylindrical-bore counterpart. Numbering ties the bearing to its envelope: 24130-cck30-w33 means spherical-roller type, dimension series 41, 150 mm bore — which is why the 250×100 mm outline swaps dimensionally with other ISO 15 bearings of the same code. Note that K30 means the 1:30 taper used on dimension series 40/41; the more common K means 1:12. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. Catalogue mass 21000 g for the 150×250×100 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. Over-driving the 24130-cck30-w33 up its sleeve pinches radial clearance below the residual minimum and can crack the inner ring in service; under-driving leaves the sleeve seat loose, so the ring creeps and frets the sleeve — measure, do not estimate.", "applications": [ "large dredger and marine winch drums", "steel-plant continuous-caster segments", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals" ], "pitfalls": [ "At 150 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24100-series series at 150 mm bore (250×100 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 2,000 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.", "Never apply the drive-up or clearance-reduction figures for this 1:30 tapered 24130-cck30-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "The adapter sleeve is selected by actual shaft diameter, not by the 150 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 24130-cck30-w33 with different sleeves.", "Catalogue reference speed and limiting speed are different limits: the 1,400 r/min reference is a thermal criterion under load, while the 2,000 r/min limiting value is the mechanical ceiling — observe both.", "The 1054/1530 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 24130 CCK30/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24130-cck30-w33?", "a": "The SKF 24130 CCK30/W33 is a double-row spherical roller bearing with a 1:30 tapered bore, 150 mm nominal bore, 250 mm outer diameter and 100 mm width (5.906 × 9.843 × 3.937 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1054 kN, C0 1530 kN, Pu 146 kN, reference speed 1,400 r/min, limiting speed 2,000 r/min, mass about 21000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K30 suffix mean on 24130-cck30-w33?", "a": "K30 (written CCK30/W33 in the CC execution) marks the 1:30 tapered bore for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder." }, { "q": "Which adapter sleeve fits the 24130-cck30-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 150 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 24130-cck30-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:30 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 24130-cck30-w33 and 24130-cc-w33?", "a": "They share the ISO 15 envelope and the same 1054/1530 kN ratings, but 24130-cck30-w33 has the 1:30 tapered bore for sleeve mounting on a plain shaft, while 24130-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "24130", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) sleeve-mounted execution of 24130; identical ISO 15 envelope, fits AH24130 withdrawal sleeve on a 145 mm shaft." }, { "equiv_sku": "C4130-V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 4130 V shares the 150×250×100 mm envelope but catalogue C/C0 differ (1220/1860 kN vs 1054/1530 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.3 withdrawal-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24130-CCK30-W33", "SKF 24130 CCK30/W33", "24130 K" ], "locale_variants": {} }, { "sku": "24032-CCK30-W33", "brand": "SKF", "manufacturer_designation": "SKF 24032 CCK30/W33", "series": "24000-series", "type": "spherical_roller", "d_mm": 160, "D_mm": 240, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 783, "static_load_kN": 1200, "fatigue_load_limit_kN": 114, "max_rpm": 2400, "reference_speed_rpm": 1700, "limiting_speed_rpm": 2400, "weight_g": 15000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 24032-cck30-w33 denotes the tapered-bore version (K30 suffix, taper 1:30) of the 24000-series spherical roller bearing: dimensioned 160×240×80 mm, it seats on an adapter or withdrawal sleeve rather than directly on a machined journal. Reading the designation: the leading 2 marks a spherical roller bearing, the 40 is the ISO 15 dimension series (dimension series 40 (compact OD, maximum width)), and the last two digits encode the 160 mm bore; the 240 mm OD and 80 mm width follow the ISO 15 general plan. Reading the suffix on 24032-cck30-w33, the K30 (or EK/CCK30) element changes only the bore — 1:30 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 24032-cc-w33. The 114 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.53 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. At 160 mm bore, dismount after service is by KM locknut reversal or a hydraulic nut on larger sizes; oil-injection grooves on the bigger sleeves let pressurised oil float the 24032-cck30-w33 off the taper without scoring either surface.", "applications": [ "steel-plant continuous-caster segments", "large induced-draft fan rotors", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder", "fan and pulley shafts that need periodic bearing removal in the field" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "smearing on the roller-raceway contact during skid starts below the minimum load" ], "pitfalls": [ "At 160 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24000-series series at 160 mm bore (240×80 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.", "The adapter sleeve is selected by actual shaft diameter, not by the 160 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 24032-cck30-w33 with different sleeves.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 80 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "The 24032-cck30-w33 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 783/1200 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The 783/1200 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 24032 CCK30/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24032-cck30-w33?", "a": "The SKF 24032 CCK30/W33 is a double-row spherical roller bearing with a 1:30 tapered bore, 160 mm nominal bore, 240 mm outer diameter and 80 mm width (6.299 × 9.449 × 3.15 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 783 kN, C0 1200 kN, Pu 114 kN, reference speed 1,700 r/min, limiting speed 2,400 r/min, mass about 15000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K30 suffix mean on 24032-cck30-w33?", "a": "K30 (written CCK30/W33 in the CC execution) marks the 1:30 tapered bore for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder." }, { "q": "Which adapter sleeve fits the 24032-cck30-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 160 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 24032-cck30-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:30 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 24032-cck30-w33 and 24032-cc-w33?", "a": "They share the ISO 15 envelope and the same 783/1200 kN ratings, but 24032-cck30-w33 has the 1:30 tapered bore for sleeve mounting on a plain shaft, while 24032-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "24032", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) sleeve-mounted execution of 24032; identical ISO 15 envelope, fits AH24032 withdrawal sleeve on a 150 mm shaft." }, { "equiv_sku": "C4032", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 4032 shares the 160×240×80 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C4032-K30", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 4032 K30 shares the 160×240×80 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C4032-2CS5V-GEM9", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 4032-2CS5V/GEM9 shares the 160×240×80 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C4032-V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 4032 V shares the 160×240×80 mm envelope but catalogue C/C0 differ (915/1460 kN vs 783/1200 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C4032-K30V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 4032 K30V shares the 160×240×80 mm envelope but catalogue C/C0 differ (915/1460 kN vs 783/1200 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.3 withdrawal-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24032-CCK30-W33", "SKF 24032 CCK30/W33", "24032 K" ], "locale_variants": {} }, { "sku": "24132-CCK30-W33", "brand": "SKF", "manufacturer_designation": "SKF 24132 CCK30/W33", "series": "24100-series", "type": "spherical_roller", "d_mm": 160, "D_mm": 270, "B_mm": 109, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1227, "static_load_kN": 1760, "fatigue_load_limit_kN": 163, "max_rpm": 1900, "reference_speed_rpm": 1300, "limiting_speed_rpm": 1900, "weight_g": 28500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "24132-cck30-w33 is the 1:30 tapered-bore execution of the 24100-series spherical roller bearing: the same two barrel-roller rows on a sphered outer raceway as 24132-cc-w33, but the inner-ring bore tapers 1 mm per 30 mm for adapter- or withdrawal-sleeve mounting, as listed by SKF in SKF catalogue PUB BU/P1 17000. Numbering ties the bearing to its envelope: 24132-cck30-w33 means spherical-roller type, dimension series 41, 160 mm bore — which is why the 270×109 mm outline swaps dimensionally with other ISO 15 bearings of the same code. Note that K30 means the 1:30 taper used on dimension series 40/41; the more common K means 1:12. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. Selection arithmetic: the C0/C ratio is about 1.43 (static 1760 kN against dynamic 1227 kN), typical of a spherical roller sized for heavy combined loads, and the 163 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. For shafts with a locating shoulder, use an AH withdrawal sleeve instead of an adapter sleeve: the bearing presses against the shoulder and the sleeve is drawn out for dismounting, making the 24132-cck30-w33 removable without an induction heater.", "applications": [ "SAG and ball-mill drive shafts", "large mining crusher main shafts", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder", "fan and pulley shafts that need periodic bearing removal in the field" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "At 160 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24100-series series at 160 mm bore (270×109 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 1,900 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.", "The adapter sleeve is selected by actual shaft diameter, not by the 160 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 24132-cck30-w33 with different sleeves.", "Never apply the drive-up or clearance-reduction figures for this 1:30 tapered 24132-cck30-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 1227/1760 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 24132 CCK30/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24132-cck30-w33?", "a": "The SKF 24132 CCK30/W33 is a double-row spherical roller bearing with a 1:30 tapered bore, 160 mm nominal bore, 270 mm outer diameter and 109 mm width (6.299 × 10.63 × 4.291 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1227 kN, C0 1760 kN, Pu 163 kN, reference speed 1,300 r/min, limiting speed 1,900 r/min, mass about 28500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K30 suffix mean on 24132-cck30-w33?", "a": "K30 (written CCK30/W33 in the CC execution) marks the 1:30 tapered bore for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder." }, { "q": "Which adapter sleeve fits the 24132-cck30-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 160 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 24132-cck30-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:30 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 24132-cck30-w33 and 24132-cc-w33?", "a": "They share the ISO 15 envelope and the same 1227/1760 kN ratings, but 24132-cck30-w33 has the 1:30 tapered bore for sleeve mounting on a plain shaft, while 24132-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "24132", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) sleeve-mounted execution of 24132; identical ISO 15 envelope, fits AH24132 withdrawal sleeve on a 150 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.3 withdrawal-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24132-CCK30-W33", "SKF 24132 CCK30/W33", "24132 K" ], "locale_variants": {} }, { "sku": "24034-CCK30-W33", "brand": "SKF", "manufacturer_designation": "SKF 24034 CCK30/W33", "series": "24000-series", "type": "spherical_roller", "d_mm": 170, "D_mm": 260, "B_mm": 90, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 963, "static_load_kN": 1460, "fatigue_load_limit_kN": 137, "max_rpm": 2400, "reference_speed_rpm": 1600, "limiting_speed_rpm": 2400, "weight_g": 20000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For sleeve mounting on a 170 mm shaft, SKF order number SKF 24034 CCK30/W33 is the 1:30 tapered-bore spherical roller bearing in the 24000-series family (dimension series 40 (compact OD, maximum width)); the cylindrical-bore equivalent is a separate order number, 24034-cc-w33. Numbering ties the bearing to its envelope: 24034-cck30-w33 means spherical-roller type, dimension series 40, 170 mm bore — which is why the 260×90 mm outline swaps dimensionally with other ISO 15 bearings of the same code. Sleeve mounting is why the K30 execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. The 45.0 mm radial section height ((260−170)/2) and 20000 g catalogue mass frame a 170 mm bore bearing rated at 963 kN C — roughly 5.66 kN of dynamic capacity per millimetre of bore before application factors. On an H adapter sleeve the 170 mm shaft seat only needs an h9 plain journal; slide the sleeve into the 24034-cck30-w33 inner ring, tighten the KM nut against the MB washer until the catalogue clearance-reduction value is reached, then lock the washer tab.", "applications": [ "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "split-housing plummer block arrangements with bearings swapped in situ", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "At 170 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24000-series series at 170 mm bore (260×90 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.", "The 24034-cck30-w33 and its cylindrical-bore counterpart 24034-cc-w33 share envelope and load ratings (963/1460 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "The adapter sleeve is selected by actual shaft diameter, not by the 170 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 24034-cck30-w33 with different sleeves.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 24034-cck30-w33 pits long before its L10 life.", "The 963/1460 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 24034 CCK30/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24034-cck30-w33?", "a": "The SKF 24034 CCK30/W33 is a double-row spherical roller bearing with a 1:30 tapered bore, 170 mm nominal bore, 260 mm outer diameter and 90 mm width (6.693 × 10.236 × 3.543 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 963 kN, C0 1460 kN, Pu 137 kN, reference speed 1,600 r/min, limiting speed 2,400 r/min, mass about 20000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K30 suffix mean on 24034-cck30-w33?", "a": "K30 (written CCK30/W33 in the CC execution) marks the 1:30 tapered bore for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder." }, { "q": "Which adapter sleeve fits the 24034-cck30-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 170 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 24034-cck30-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:30 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 24034-cck30-w33 and 24034-cc-w33?", "a": "They share the ISO 15 envelope and the same 963/1460 kN ratings, but 24034-cck30-w33 has the 1:30 tapered bore for sleeve mounting on a plain shaft, while 24034-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "24034", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) sleeve-mounted execution of 24034; identical ISO 15 envelope, fits AH24034 withdrawal sleeve on a 160 mm shaft." }, { "equiv_sku": "C4034-V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 4034 V shares the 170×260×90 mm envelope but catalogue C/C0 differ (1140/1860 kN vs 963/1460 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C4034-K30V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 4034 K30V shares the 170×260×90 mm envelope but catalogue C/C0 differ (1140/1860 kN vs 963/1460 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.3 withdrawal-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24034-CCK30-W33", "SKF 24034 CCK30/W33", "24034 K" ], "locale_variants": {} }, { "sku": "24134-CCK30-W33", "brand": "SKF", "manufacturer_designation": "SKF 24134 CCK30/W33", "series": "24100-series", "type": "spherical_roller", "d_mm": 170, "D_mm": 280, "B_mm": 109, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1270, "static_load_kN": 1860, "fatigue_load_limit_kN": 170, "max_rpm": 1800, "reference_speed_rpm": 1200, "limiting_speed_rpm": 1800, "weight_g": 30000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 24134-cck30-w33 denotes the tapered-bore version (K30 suffix, taper 1:30) of the 24100-series spherical roller bearing: dimensioned 170×280×109 mm, it seats on an adapter or withdrawal sleeve rather than directly on a machined journal. The code breaks down as type digit 2 (double-row spherical roller), dimension series 41 (dimension series 41 (medium OD, maximum width)), and bore code 34 = 170 mm; dimensions 170×280×109 mm therefore match the ISO 15 envelope. The K30 in the designation marks the 1:30 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. Catalogue mass 30000 g for the 170×280×109 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. Mounting on the 1:30 taper is controlled by clearance reduction or measured axial drive-up, never by locknut torque: SKF tables give the target radial-clearance decrease for the 170 mm 24134-cck30-w33, checked with feeler gauges before and after drive-up.", "applications": [ "large dredger and marine winch drums", "steel-plant continuous-caster segments", "split-housing plummer block arrangements with bearings swapped in situ", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems" ], "pitfalls": [ "At 170 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24100-series series at 170 mm bore (280×109 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 1,800 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.", "The 24134-cck30-w33 and its cylindrical-bore counterpart 24134-cc-w33 share envelope and load ratings (1270/1860 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "The 24134-cck30-w33 and its cylindrical-bore counterpart 24134-cc-w33 share envelope and load ratings (1270/1860 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "Never use the tapered-bore CCK30/K30 variant's drive-up figures on this cylindrical-bore 24134-cck30-w33; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 1270/1860 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 24134 CCK30/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24134-cck30-w33?", "a": "The SKF 24134 CCK30/W33 is a double-row spherical roller bearing with a 1:30 tapered bore, 170 mm nominal bore, 280 mm outer diameter and 109 mm width (6.693 × 11.024 × 4.291 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1270 kN, C0 1860 kN, Pu 170 kN, reference speed 1,200 r/min, limiting speed 1,800 r/min, mass about 30000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K30 suffix mean on 24134-cck30-w33?", "a": "K30 (written CCK30/W33 in the CC execution) marks the 1:30 tapered bore for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder." }, { "q": "Which adapter sleeve fits the 24134-cck30-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 170 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 24134-cck30-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:30 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 24134-cck30-w33 and 24134-cc-w33?", "a": "They share the ISO 15 envelope and the same 1270/1860 kN ratings, but 24134-cck30-w33 has the 1:30 tapered bore for sleeve mounting on a plain shaft, while 24134-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "24134", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) sleeve-mounted execution of 24134; identical ISO 15 envelope, fits AH24134 withdrawal sleeve on a 160 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.3 withdrawal-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24134-CCK30-W33", "SKF 24134 CCK30/W33", "24134 K" ], "locale_variants": {} }, { "sku": "24036-CCK30-W33", "brand": "SKF", "manufacturer_designation": "SKF 24036 CCK30/W33", "series": "24000-series", "type": "spherical_roller", "d_mm": 180, "D_mm": 280, "B_mm": 100, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1134, "static_load_kN": 1730, "fatigue_load_limit_kN": 156, "max_rpm": 2200, "reference_speed_rpm": 1500, "limiting_speed_rpm": 2200, "weight_g": 25500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF 24036 CCK30/W33 in SKF catalogue PUB BU/P1 17000 is a double-row spherical roller bearing with a tapered bore (1:30), intended for an H-series adapter sleeve or AH withdrawal sleeve, with two pressed-steel cages with a floating guide ring and the same 180×280×100 mm ISO 15 outline as its cylindrical-bore counterpart. The code breaks down as type digit 2 (double-row spherical roller), dimension series 40 (dimension series 40 (compact OD, maximum width)), and bore code 36 = 180 mm; dimensions 180×280×100 mm therefore match the ISO 15 envelope. Sleeve mounting is why the K30 execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. At 1,500 r/min reference speed the 50.0 mm-section 24036-cck30-w33 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 2,200 r/min as the mechanical ceiling. Over-driving the 24036-cck30-w33 up its sleeve pinches radial clearance below the residual minimum and can crack the inner ring in service; under-driving leaves the sleeve seat loose, so the ring creeps and frets the sleeve — measure, do not estimate.", "applications": [ "large induced-draft fan rotors", "SAG and ball-mill drive shafts", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still" ], "pitfalls": [ "At 180 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24000-series series at 180 mm bore (280×100 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.", "The adapter sleeve is selected by actual shaft diameter, not by the 180 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 24036-cck30-w33 with different sleeves.", "Never apply the drive-up or clearance-reduction figures for this 1:30 tapered 24036-cck30-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "Catalogue reference speed and limiting speed are different limits: the 1,500 r/min reference is a thermal criterion under load, while the 2,200 r/min limiting value is the mechanical ceiling — observe both.", "The 1134/1730 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 24036 CCK30/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24036-cck30-w33?", "a": "The SKF 24036 CCK30/W33 is a double-row spherical roller bearing with a 1:30 tapered bore, 180 mm nominal bore, 280 mm outer diameter and 100 mm width (7.087 × 11.024 × 3.937 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1134 kN, C0 1730 kN, Pu 156 kN, reference speed 1,500 r/min, limiting speed 2,200 r/min, mass about 25500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K30 suffix mean on 24036-cck30-w33?", "a": "K30 (written CCK30/W33 in the CC execution) marks the 1:30 tapered bore for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder." }, { "q": "Which adapter sleeve fits the 24036-cck30-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 180 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 24036-cck30-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:30 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 24036-cck30-w33 and 24036-cc-w33?", "a": "They share the ISO 15 envelope and the same 1134/1730 kN ratings, but 24036-cck30-w33 has the 1:30 tapered bore for sleeve mounting on a plain shaft, while 24036-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "24036", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) sleeve-mounted execution of 24036; identical ISO 15 envelope, fits AH24036 withdrawal sleeve on a 170 mm shaft." }, { "equiv_sku": "C4036-V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 4036 V shares the 180×280×100 mm envelope but catalogue C/C0 differ (1320/2120 kN vs 1134/1730 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.3 withdrawal-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24036-CCK30-W33", "SKF 24036 CCK30/W33", "24036 K" ], "locale_variants": {} }, { "sku": "24136-CCK30-W33", "brand": "SKF", "manufacturer_designation": "SKF 24136 CCK30/W33", "series": "24100-series", "type": "spherical_roller", "d_mm": 180, "D_mm": 300, "B_mm": 118, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1449, "static_load_kN": 2160, "fatigue_load_limit_kN": 196, "max_rpm": 1600, "reference_speed_rpm": 1100, "limiting_speed_rpm": 1600, "weight_g": 37000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF lists SKF 24136 CCK30/W33 as the adapter-sleeve execution in the 24100-series range: a 180 mm nominal-bore spherical roller bearing whose 1:30 tapered inner ring is driven up a sleeve, with 300 mm OD and 118 mm width to the ISO 15 envelope. Digit by digit, 24136-cck30-w33 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 41, and bore reference 36 resolving to 180 mm; 300 mm OD and 118 mm width are the matching ISO 15 boundary values. The K30 in the designation marks the 1:30 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. Speed planning uses two different ceilings: 1,100 r/min thermal reference and 1,600 r/min mechanical limiting speed. On an H adapter sleeve the 180 mm shaft seat only needs an h9 plain journal; slide the sleeve into the 24136-cck30-w33 inner ring, tighten the KM nut against the MB washer until the catalogue clearance-reduction value is reached, then lock the washer tab.", "applications": [ "large mining crusher main shafts", "wind-turbine main shaft support", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 180 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24100-series series at 180 mm bore (300×118 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 1,600 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.", "The adapter sleeve is selected by actual shaft diameter, not by the 180 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 24136-cck30-w33 with different sleeves.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 118 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "The 37000 g mass and 118 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 24136-cck30-w33.", "The 1449/2160 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 24136 CCK30/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24136-cck30-w33?", "a": "The SKF 24136 CCK30/W33 is a double-row spherical roller bearing with a 1:30 tapered bore, 180 mm nominal bore, 300 mm outer diameter and 118 mm width (7.087 × 11.811 × 4.646 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1449 kN, C0 2160 kN, Pu 196 kN, reference speed 1,100 r/min, limiting speed 1,600 r/min, mass about 37000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K30 suffix mean on 24136-cck30-w33?", "a": "K30 (written CCK30/W33 in the CC execution) marks the 1:30 tapered bore for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder." }, { "q": "Which adapter sleeve fits the 24136-cck30-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 180 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 24136-cck30-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:30 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 24136-cck30-w33 and 24136-cc-w33?", "a": "They share the ISO 15 envelope and the same 1449/2160 kN ratings, but 24136-cck30-w33 has the 1:30 tapered bore for sleeve mounting on a plain shaft, while 24136-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "24136", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) sleeve-mounted execution of 24136; identical ISO 15 envelope, fits AH24136 withdrawal sleeve on a 170 mm shaft." }, { "equiv_sku": "C4136-V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 4136 V shares the 180×300×118 mm envelope but catalogue C/C0 differ (1760/2700 kN vs 1449/2160 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.3 withdrawal-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24136-CCK30-W33", "SKF 24136 CCK30/W33", "24136 K" ], "locale_variants": {} }, { "sku": "24038-CCK30-W33", "brand": "SKF", "manufacturer_designation": "SKF 24038 CCK30/W33", "series": "24000-series", "type": "spherical_roller", "d_mm": 190, "D_mm": 290, "B_mm": 100, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1164, "static_load_kN": 1800, "fatigue_load_limit_kN": 163, "max_rpm": 2000, "reference_speed_rpm": 1400, "limiting_speed_rpm": 2000, "weight_g": 27500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The SKF 24038 CCK30/W33 is a 190×290×100 mm spherical roller bearing with a 1:30 tapered bore — SKF catalogue execution for sleeve mounting on a 190 mm plain shaft, retaining the double-row self-aligning barrel-roller design. Digit by digit, 24038-cck30-w33 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 40, and bore reference 38 resolving to 190 mm; 290 mm OD and 100 mm width are the matching ISO 15 boundary values. Note that K30 means the 1:30 taper used on dimension series 40/41; the more common K means 1:12. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. With C 1164 kN and C0 1800 kN, the 24038-cck30-w33 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. Because driving up the 1:30 taper consumes radial clearance, K30 executions are commonly ordered with C3 initial clearance so the residual running clearance after mounting matches the cylindrical-bore 24038-cc-w33 on an interference seat.", "applications": [ "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat", "split-housing plummer block arrangements with bearings swapped in situ" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "At 190 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24000-series series at 190 mm bore (290×100 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.", "The 24038-cck30-w33 and its cylindrical-bore counterpart 24038-cc-w33 share envelope and load ratings (1164/1800 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "The 24038-cck30-w33 and its cylindrical-bore counterpart 24038-cc-w33 share envelope and load ratings (1164/1800 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 1164/1800 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 24038 CCK30/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24038-cck30-w33?", "a": "The SKF 24038 CCK30/W33 is a double-row spherical roller bearing with a 1:30 tapered bore, 190 mm nominal bore, 290 mm outer diameter and 100 mm width (7.48 × 11.417 × 3.937 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1164 kN, C0 1800 kN, Pu 163 kN, reference speed 1,400 r/min, limiting speed 2,000 r/min, mass about 27500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K30 suffix mean on 24038-cck30-w33?", "a": "K30 (written CCK30/W33 in the CC execution) marks the 1:30 tapered bore for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder." }, { "q": "Which adapter sleeve fits the 24038-cck30-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 190 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 24038-cck30-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:30 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 24038-cck30-w33 and 24038-cc-w33?", "a": "They share the ISO 15 envelope and the same 1164/1800 kN ratings, but 24038-cck30-w33 has the 1:30 tapered bore for sleeve mounting on a plain shaft, while 24038-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "24038", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) sleeve-mounted execution of 24038; identical ISO 15 envelope, fits AH24038 withdrawal sleeve on a 180 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.3 withdrawal-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24038-CCK30-W33", "SKF 24038 CCK30/W33", "24038 K" ], "locale_variants": {} }, { "sku": "24138-CCK30-W33", "brand": "SKF", "manufacturer_designation": "SKF 24138 CCK30/W33", "series": "24100-series", "type": "spherical_roller", "d_mm": 190, "D_mm": 320, "B_mm": 128, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1652, "static_load_kN": 2500, "fatigue_load_limit_kN": 212, "max_rpm": 1500, "reference_speed_rpm": 1100, "limiting_speed_rpm": 1500, "weight_g": 46500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF 24138 CCK30/W33 in SKF catalogue PUB BU/P1 17000 is a double-row spherical roller bearing with a tapered bore (1:30), intended for an H-series adapter sleeve or AH withdrawal sleeve, with two pressed-steel cages with a floating guide ring and the same 190×320×128 mm ISO 15 outline as its cylindrical-bore counterpart. On the SKF nameplate, 24138-cck30-w33 follows the ISO 15 convention: 2 for the spherical roller type, 41 for the dimension series 41 (medium OD, maximum width), final digits 38 for the 190 mm bore. Reading the suffix on 24138-cck30-w33, the K30 (or EK/CCK30) element changes only the bore — 1:30 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 24138-cc-w33. The 212 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.51 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. After drive-up, re-check radial clearance and then swing the outer ring through its self-aligning range: the sphered raceway of the 24138-cck30-w33 must still tilt ≈ 0.5–2.5° freely — a joint that binds after sleeve mounting signals excessive drive-up or a cocked sleeve.", "applications": [ "steel-plant continuous-caster segments", "large induced-draft fan rotors", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat", "split-housing plummer block arrangements with bearings swapped in situ" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "At 190 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24100-series series at 190 mm bore (320×128 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 1,500 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.", "The 24138-cck30-w33 and its cylindrical-bore counterpart 24138-cc-w33 share envelope and load ratings (1652/2500 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "The adapter sleeve is selected by actual shaft diameter, not by the 190 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 24138-cck30-w33 with different sleeves.", "Shaft and housing fillets must clear the bearing chamfer so the 128 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 1652/2500 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 24138 CCK30/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24138-cck30-w33?", "a": "The SKF 24138 CCK30/W33 is a double-row spherical roller bearing with a 1:30 tapered bore, 190 mm nominal bore, 320 mm outer diameter and 128 mm width (7.48 × 12.598 × 5.039 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1652 kN, C0 2500 kN, Pu 212 kN, reference speed 1,100 r/min, limiting speed 1,500 r/min, mass about 46500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K30 suffix mean on 24138-cck30-w33?", "a": "K30 (written CCK30/W33 in the CC execution) marks the 1:30 tapered bore for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder." }, { "q": "Which adapter sleeve fits the 24138-cck30-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 190 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 24138-cck30-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:30 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 24138-cck30-w33 and 24138-cc-w33?", "a": "They share the ISO 15 envelope and the same 1652/2500 kN ratings, but 24138-cck30-w33 has the 1:30 tapered bore for sleeve mounting on a plain shaft, while 24138-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "24138", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) sleeve-mounted execution of 24138; identical ISO 15 envelope, fits AH24138 withdrawal sleeve on a 180 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.3 withdrawal-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24138-CCK30-W33", "SKF 24138 CCK30/W33", "24138 K" ], "locale_variants": {} }, { "sku": "24040-CCK30-W33", "brand": "SKF", "manufacturer_designation": "SKF 24040 CCK30/W33", "series": "24000-series", "type": "spherical_roller", "d_mm": 200, "D_mm": 310, "B_mm": 109, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1353, "static_load_kN": 2120, "fatigue_load_limit_kN": 186, "max_rpm": 1900, "reference_speed_rpm": 1300, "limiting_speed_rpm": 1900, "weight_g": 34500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The SKF 24040 CCK30/W33 is a 200×310×109 mm spherical roller bearing with a 1:30 tapered bore — SKF catalogue execution for sleeve mounting on a 200 mm plain shaft, retaining the double-row self-aligning barrel-roller design. Numbering ties the bearing to its envelope: 24040-cck30-w33 means spherical-roller type, dimension series 40, 200 mm bore — which is why the 310×109 mm outline swaps dimensionally with other ISO 15 bearings of the same code. The K30 in the designation marks the 1:30 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. With C 1353 kN and C0 2120 kN, the 24040-cck30-w33 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. Over-driving the 24040-cck30-w33 up its sleeve pinches radial clearance below the residual minimum and can crack the inner ring in service; under-driving leaves the sleeve seat loose, so the ring creeps and frets the sleeve — measure, do not estimate.", "applications": [ "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 200 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24000-series series at 200 mm bore (310×109 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 109 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "Never apply the drive-up or clearance-reduction figures for this 1:30 tapered 24040-cck30-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "Never use the tapered-bore CCK30/K30 variant's drive-up figures on this cylindrical-bore 24040-cck30-w33; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 1353/2120 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 24040 CCK30/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24040-cck30-w33?", "a": "The SKF 24040 CCK30/W33 is a double-row spherical roller bearing with a 1:30 tapered bore, 200 mm nominal bore, 310 mm outer diameter and 109 mm width (7.874 × 12.205 × 4.291 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1353 kN, C0 2120 kN, Pu 186 kN, reference speed 1,300 r/min, limiting speed 1,900 r/min, mass about 34500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K30 suffix mean on 24040-cck30-w33?", "a": "K30 (written CCK30/W33 in the CC execution) marks the 1:30 tapered bore for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder." }, { "q": "Which adapter sleeve fits the 24040-cck30-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 200 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 24040-cck30-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:30 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 24040-cck30-w33 and 24040-cc-w33?", "a": "They share the ISO 15 envelope and the same 1353/2120 kN ratings, but 24040-cck30-w33 has the 1:30 tapered bore for sleeve mounting on a plain shaft, while 24040-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "24040", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) sleeve-mounted execution of 24040; identical ISO 15 envelope, fits AH24040 withdrawal sleeve on a 190 mm shaft." }, { "equiv_sku": "C4040-V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 4040 V shares the 200×310×109 mm envelope but catalogue C/C0 differ (1630/2650 kN vs 1353/2120 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.3 withdrawal-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24040-CCK30-W33", "SKF 24040 CCK30/W33", "24040 K" ], "locale_variants": {} }, { "sku": "24140-CCK30-W33", "brand": "SKF", "manufacturer_designation": "SKF 24140 CCK30/W33", "series": "24100-series", "type": "spherical_roller", "d_mm": 200, "D_mm": 340, "B_mm": 140, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1865, "static_load_kN": 2800, "fatigue_load_limit_kN": 232, "max_rpm": 1400, "reference_speed_rpm": 1000, "limiting_speed_rpm": 1400, "weight_g": 57500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For sleeve mounting on a 200 mm shaft, SKF order number SKF 24140 CCK30/W33 is the 1:30 tapered-bore spherical roller bearing in the 24100-series family (dimension series 41 (medium OD, maximum width)); the cylindrical-bore equivalent is a separate order number, 24140-cc-w33. The code breaks down as type digit 2 (double-row spherical roller), dimension series 41 (dimension series 41 (medium OD, maximum width)), and bore code 40 = 200 mm; dimensions 200×340×140 mm therefore match the ISO 15 envelope. The K30 in the designation marks the 1:30 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. Catalogue mass 57500 g for the 200×340×140 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. At 200 mm bore, dismount after service is by KM locknut reversal or a hydraulic nut on larger sizes; oil-injection grooves on the bigger sleeves let pressurised oil float the 24140-cck30-w33 off the taper without scoring either surface.", "applications": [ "large dredger and marine winch drums", "steel-plant continuous-caster segments", "split-housing plummer block arrangements with bearings swapped in situ", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "At 200 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24100-series series at 200 mm bore (340×140 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 1,400 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 140 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "The adapter sleeve is selected by actual shaft diameter, not by the 200 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 24140-cck30-w33 with different sleeves.", "The 57500 g mass and 140 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 24140-cck30-w33.", "The 1865/2800 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 24140 CCK30/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24140-cck30-w33?", "a": "The SKF 24140 CCK30/W33 is a double-row spherical roller bearing with a 1:30 tapered bore, 200 mm nominal bore, 340 mm outer diameter and 140 mm width (7.874 × 13.386 × 5.512 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1865 kN, C0 2800 kN, Pu 232 kN, reference speed 1,000 r/min, limiting speed 1,400 r/min, mass about 57500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K30 suffix mean on 24140-cck30-w33?", "a": "K30 (written CCK30/W33 in the CC execution) marks the 1:30 tapered bore for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder." }, { "q": "Which adapter sleeve fits the 24140-cck30-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 200 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 24140-cck30-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:30 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 24140-cck30-w33 and 24140-cc-w33?", "a": "They share the ISO 15 envelope and the same 1865/2800 kN ratings, but 24140-cck30-w33 has the 1:30 tapered bore for sleeve mounting on a plain shaft, while 24140-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "24140", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) sleeve-mounted execution of 24140; identical ISO 15 envelope, fits AH24140 withdrawal sleeve on a 190 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.3 withdrawal-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24140-CCK30-W33", "SKF 24140 CCK30/W33", "24140 K" ], "locale_variants": {} }, { "sku": "24044-CCK30-W33", "brand": "SKF", "manufacturer_designation": "SKF 24044 CCK30/W33", "series": "24000-series", "type": "spherical_roller", "d_mm": 220, "D_mm": 340, "B_mm": 118, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1628, "static_load_kN": 2600, "fatigue_load_limit_kN": 212, "max_rpm": 1700, "reference_speed_rpm": 1200, "limiting_speed_rpm": 1700, "weight_g": 47500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For sleeve mounting on a 220 mm shaft, SKF order number SKF 24044 CCK30/W33 is the 1:30 tapered-bore spherical roller bearing in the 24000-series family (dimension series 40 (compact OD, maximum width)); the cylindrical-bore equivalent is a separate order number, 24044-cc-w33. The code breaks down as type digit 2 (double-row spherical roller), dimension series 40 (dimension series 40 (compact OD, maximum width)), and bore code 44 = 220 mm; dimensions 220×340×118 mm therefore match the ISO 15 envelope. Reading the suffix on 24044-cck30-w33, the K30 (or EK/CCK30) element changes only the bore — 1:30 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 24044-cc-w33. With C 1628 kN and C0 2600 kN, the 24044-cck30-w33 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. Mounting on the 1:30 taper is controlled by clearance reduction or measured axial drive-up, never by locknut torque: SKF tables give the target radial-clearance decrease for the 220 mm 24044-cck30-w33, checked with feeler gauges before and after drive-up.", "applications": [ "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "smearing on the roller-raceway contact during skid starts below the minimum load" ], "pitfalls": [ "At 220 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24000-series series at 220 mm bore (340×118 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.", "The adapter sleeve is selected by actual shaft diameter, not by the 220 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 24044-cck30-w33 with different sleeves.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 118 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "Shaft and housing fillets must clear the bearing chamfer so the 118 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 1628/2600 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 24044 CCK30/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24044-cck30-w33?", "a": "The SKF 24044 CCK30/W33 is a double-row spherical roller bearing with a 1:30 tapered bore, 220 mm nominal bore, 340 mm outer diameter and 118 mm width (8.661 × 13.386 × 4.646 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1628 kN, C0 2600 kN, Pu 212 kN, reference speed 1,200 r/min, limiting speed 1,700 r/min, mass about 47500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K30 suffix mean on 24044-cck30-w33?", "a": "K30 (written CCK30/W33 in the CC execution) marks the 1:30 tapered bore for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder." }, { "q": "Which adapter sleeve fits the 24044-cck30-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 220 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 24044-cck30-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:30 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 24044-cck30-w33 and 24044-cc-w33?", "a": "They share the ISO 15 envelope and the same 1628/2600 kN ratings, but 24044-cck30-w33 has the 1:30 tapered bore for sleeve mounting on a plain shaft, while 24044-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "24044", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) sleeve-mounted execution of 24044; identical ISO 15 envelope, fits AOH24044 withdrawal sleeve on a 200 mm shaft." }, { "equiv_sku": "C4044-V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 4044 V shares the 220×340×118 mm envelope but catalogue C/C0 differ (1930/3250 kN vs 1628/2600 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." }, { "equiv_sku": "C4044-K30V", "equiv_brand": "SKF", "level": "partial", "note": "SKF CARB toroidal bearing C 4044 K30V shares the 220×340×118 mm envelope but catalogue C/C0 differ (1930/3250 kN vs 1628/2600 kN); it floats axially and cannot locate the shaft — pair, never swap one-for-one." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.3 withdrawal-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24044-CCK30-W33", "SKF 24044 CCK30/W33", "24044 K" ], "locale_variants": {} }, { "sku": "24144-CCK30-W33", "brand": "SKF", "manufacturer_designation": "SKF 24144 CCK30/W33", "series": "24100-series", "type": "spherical_roller", "d_mm": 220, "D_mm": 370, "B_mm": 150, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2197, "static_load_kN": 3350, "fatigue_load_limit_kN": 285, "max_rpm": 1200, "reference_speed_rpm": 850, "limiting_speed_rpm": 1200, "weight_g": 76000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 24144-cck30-w33 denotes the tapered-bore version (K30 suffix, taper 1:30) of the 24100-series spherical roller bearing: dimensioned 220×370×150 mm, it seats on an adapter or withdrawal sleeve rather than directly on a machined journal. Digit by digit, 24144-cck30-w33 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 41, and bore reference 44 resolving to 220 mm; 370 mm OD and 150 mm width are the matching ISO 15 boundary values. Sleeve mounting is why the K30 execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. Catalogue mass 76000 g for the 220×370×150 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. After drive-up, re-check radial clearance and then swing the outer ring through its self-aligning range: the sphered raceway of the 24144-cck30-w33 must still tilt ≈ 0.5–2.5° freely — a joint that binds after sleeve mounting signals excessive drive-up or a cocked sleeve.", "applications": [ "large dredger and marine winch drums", "steel-plant continuous-caster segments", "split-housing plummer block arrangements with bearings swapped in situ", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still" ], "pitfalls": [ "At 220 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24100-series series at 220 mm bore (370×150 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 1,200 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.", "The adapter sleeve is selected by actual shaft diameter, not by the 220 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 24144-cck30-w33 with different sleeves.", "The 24144-cck30-w33 and its cylindrical-bore counterpart 24144-cc-w33 share envelope and load ratings (2197/3350 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "The 24144-cck30-w33 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 2197/3350 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The 2197/3350 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 24144 CCK30/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24144-cck30-w33?", "a": "The SKF 24144 CCK30/W33 is a double-row spherical roller bearing with a 1:30 tapered bore, 220 mm nominal bore, 370 mm outer diameter and 150 mm width (8.661 × 14.567 × 5.906 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 2197 kN, C0 3350 kN, Pu 285 kN, reference speed 850 r/min, limiting speed 1,200 r/min, mass about 76000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K30 suffix mean on 24144-cck30-w33?", "a": "K30 (written CCK30/W33 in the CC execution) marks the 1:30 tapered bore for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder." }, { "q": "Which adapter sleeve fits the 24144-cck30-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 220 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 24144-cck30-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:30 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 24144-cck30-w33 and 24144-cc-w33?", "a": "They share the ISO 15 envelope and the same 2197/3350 kN ratings, but 24144-cck30-w33 has the 1:30 tapered bore for sleeve mounting on a plain shaft, while 24144-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "24144", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) sleeve-mounted execution of 24144; identical ISO 15 envelope, fits AOH24144 withdrawal sleeve on a 200 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.3 withdrawal-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24144-CCK30-W33", "SKF 24144 CCK30/W33", "24144 K" ], "locale_variants": {} }, { "sku": "24048-CCK30-W33", "brand": "SKF", "manufacturer_designation": "SKF 24048 CCK30/W33", "series": "24000-series", "type": "spherical_roller", "d_mm": 240, "D_mm": 360, "B_mm": 118, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1663, "static_load_kN": 2700, "fatigue_load_limit_kN": 228, "max_rpm": 1600, "reference_speed_rpm": 1100, "limiting_speed_rpm": 1600, "weight_g": 50500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The SKF 24048 CCK30/W33 is a 240×360×118 mm spherical roller bearing with a 1:30 tapered bore — SKF catalogue execution for sleeve mounting on a 240 mm plain shaft, retaining the double-row self-aligning barrel-roller design. On the SKF nameplate, 24048-cck30-w33 follows the ISO 15 convention: 2 for the spherical roller type, 40 for the dimension series 40 (compact OD, maximum width), final digits 48 for the 240 mm bore. Sleeve mounting is why the K30 execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. Catalogue mass 50500 g for the 240×360×118 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. After drive-up, re-check radial clearance and then swing the outer ring through its self-aligning range: the sphered raceway of the 24048-cck30-w33 must still tilt ≈ 0.5–2.5° freely — a joint that binds after sleeve mounting signals excessive drive-up or a cocked sleeve.", "applications": [ "large dredger and marine winch drums", "steel-plant continuous-caster segments", "split-housing plummer block arrangements with bearings swapped in situ", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still" ], "pitfalls": [ "At 240 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24000-series series at 240 mm bore (360×118 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.", "The adapter sleeve is selected by actual shaft diameter, not by the 240 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 24048-cck30-w33 with different sleeves.", "Never apply the drive-up or clearance-reduction figures for this 1:30 tapered 24048-cck30-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 24048-cck30-w33 pits long before its L10 life.", "The 1663/2700 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 24048 CCK30/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24048-cck30-w33?", "a": "The SKF 24048 CCK30/W33 is a double-row spherical roller bearing with a 1:30 tapered bore, 240 mm nominal bore, 360 mm outer diameter and 118 mm width (9.449 × 14.173 × 4.646 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 1663 kN, C0 2700 kN, Pu 228 kN, reference speed 1,100 r/min, limiting speed 1,600 r/min, mass about 50500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K30 suffix mean on 24048-cck30-w33?", "a": "K30 (written CCK30/W33 in the CC execution) marks the 1:30 tapered bore for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder." }, { "q": "Which adapter sleeve fits the 24048-cck30-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 240 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 24048-cck30-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:30 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 24048-cck30-w33 and 24048-cc-w33?", "a": "They share the ISO 15 envelope and the same 1663/2700 kN ratings, but 24048-cck30-w33 has the 1:30 tapered bore for sleeve mounting on a plain shaft, while 24048-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "24048", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) sleeve-mounted execution of 24048; identical ISO 15 envelope, fits AOH24048 withdrawal sleeve on a 220 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.3 withdrawal-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24048-CCK30-W33", "SKF 24048 CCK30/W33", "24048 K" ], "locale_variants": {} }, { "sku": "24148-CCK30-W33", "brand": "SKF", "manufacturer_designation": "SKF 24148 CCK30/W33", "series": "24100-series", "type": "spherical_roller", "d_mm": 240, "D_mm": 400, "B_mm": 160, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2489, "static_load_kN": 3900, "fatigue_load_limit_kN": 320, "max_rpm": 1100, "reference_speed_rpm": 750, "limiting_speed_rpm": 1100, "weight_g": 91500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF 24148 CCK30/W33 in SKF catalogue PUB BU/P1 17000 is a double-row spherical roller bearing with a tapered bore (1:30), intended for an H-series adapter sleeve or AH withdrawal sleeve, with two pressed-steel cages with a floating guide ring and the same 240×400×160 mm ISO 15 outline as its cylindrical-bore counterpart. Reading the designation: the leading 2 marks a spherical roller bearing, the 41 is the ISO 15 dimension series (dimension series 41 (medium OD, maximum width)), and the last two digits encode the 240 mm bore; the 400 mm OD and 160 mm width follow the ISO 15 general plan. Note that K30 means the 1:30 taper used on dimension series 40/41; the more common K means 1:12. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. The 320 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.57 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. For shafts with a locating shoulder, use an AH withdrawal sleeve instead of an adapter sleeve: the bearing presses against the shoulder and the sleeve is drawn out for dismounting, making the 24148-cck30-w33 removable without an induction heater.", "applications": [ "steel-plant continuous-caster segments", "large induced-draft fan rotors", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat", "split-housing plummer block arrangements with bearings swapped in situ" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals" ], "pitfalls": [ "At 240 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24100-series series at 240 mm bore (400×160 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 1,100 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.", "The adapter sleeve is selected by actual shaft diameter, not by the 240 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 24148-cck30-w33 with different sleeves.", "The adapter sleeve is selected by actual shaft diameter, not by the 240 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 24148-cck30-w33 with different sleeves.", "Catalogue reference speed and limiting speed are different limits: the 750 r/min reference is a thermal criterion under load, while the 1,100 r/min limiting value is the mechanical ceiling — observe both.", "The 2489/3900 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 24148 CCK30/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24148-cck30-w33?", "a": "The SKF 24148 CCK30/W33 is a double-row spherical roller bearing with a 1:30 tapered bore, 240 mm nominal bore, 400 mm outer diameter and 160 mm width (9.449 × 15.748 × 6.299 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 2489 kN, C0 3900 kN, Pu 320 kN, reference speed 750 r/min, limiting speed 1,100 r/min, mass about 91500 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K30 suffix mean on 24148-cck30-w33?", "a": "K30 (written CCK30/W33 in the CC execution) marks the 1:30 tapered bore for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder." }, { "q": "Which adapter sleeve fits the 24148-cck30-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 240 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 24148-cck30-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:30 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 24148-cck30-w33 and 24148-cc-w33?", "a": "They share the ISO 15 envelope and the same 2489/3900 kN ratings, but 24148-cck30-w33 has the 1:30 tapered bore for sleeve mounting on a plain shaft, while 24148-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "24148", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) sleeve-mounted execution of 24148; identical ISO 15 envelope, fits AOH24148 withdrawal sleeve on a 220 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.3 withdrawal-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24148-CCK30-W33", "SKF 24148 CCK30/W33", "24148 K" ], "locale_variants": {} }, { "sku": "24052-CCK30-W33", "brand": "SKF", "manufacturer_designation": "SKF 24052 CCK30/W33", "series": "24000-series", "type": "spherical_roller", "d_mm": 260, "D_mm": 400, "B_mm": 140, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2135, "static_load_kN": 3450, "fatigue_load_limit_kN": 285, "max_rpm": 1400, "reference_speed_rpm": 1000, "limiting_speed_rpm": 1400, "weight_g": 75000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 24052-cck30-w33 denotes the tapered-bore version (K30 suffix, taper 1:30) of the 24000-series spherical roller bearing: dimensioned 260×400×140 mm, it seats on an adapter or withdrawal sleeve rather than directly on a machined journal. Digit by digit, 24052-cck30-w33 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 40, and bore reference 52 resolving to 260 mm; 400 mm OD and 140 mm width are the matching ISO 15 boundary values. Sleeve mounting is why the K30 execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. Selection arithmetic: the C0/C ratio is about 1.62 (static 3450 kN against dynamic 2135 kN), typical of a spherical roller sized for heavy combined loads, and the 285 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. On an H adapter sleeve the 260 mm shaft seat only needs an h9 plain journal; slide the sleeve into the 24052-cck30-w33 inner ring, tighten the KM nut against the MB washer until the catalogue clearance-reduction value is reached, then lock the washer tab.", "applications": [ "SAG and ball-mill drive shafts", "large mining crusher main shafts", "fan and pulley shafts that need periodic bearing removal in the field", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still" ], "pitfalls": [ "At 260 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24000-series series at 260 mm bore (400×140 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 140 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "The 24052-cck30-w33 and its cylindrical-bore counterpart 24052-cc-w33 share envelope and load ratings (2135/3450 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 24052-cck30-w33 pits long before its L10 life.", "The 2135/3450 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 24052 CCK30/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24052-cck30-w33?", "a": "The SKF 24052 CCK30/W33 is a double-row spherical roller bearing with a 1:30 tapered bore, 260 mm nominal bore, 400 mm outer diameter and 140 mm width (10.236 × 15.748 × 5.512 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 2135 kN, C0 3450 kN, Pu 285 kN, reference speed 1,000 r/min, limiting speed 1,400 r/min, mass about 75000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K30 suffix mean on 24052-cck30-w33?", "a": "K30 (written CCK30/W33 in the CC execution) marks the 1:30 tapered bore for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder." }, { "q": "Which adapter sleeve fits the 24052-cck30-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 260 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 24052-cck30-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:30 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 24052-cck30-w33 and 24052-cc-w33?", "a": "They share the ISO 15 envelope and the same 2135/3450 kN ratings, but 24052-cck30-w33 has the 1:30 tapered bore for sleeve mounting on a plain shaft, while 24052-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "24052", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) sleeve-mounted execution of 24052; identical ISO 15 envelope, fits AOH24052 withdrawal sleeve on a 240 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.3 withdrawal-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24052-CCK30-W33", "SKF 24052 CCK30/W33", "24052 K" ], "locale_variants": {} }, { "sku": "24152-CCK30-W33", "brand": "SKF", "manufacturer_designation": "SKF 24152 CCK30/W33", "series": "24100-series", "type": "spherical_roller", "d_mm": 260, "D_mm": 440, "B_mm": 180, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 3086, "static_load_kN": 4800, "fatigue_load_limit_kN": 380, "max_rpm": 950, "reference_speed_rpm": 670, "limiting_speed_rpm": 950, "weight_g": 120000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "24152-cck30-w33 is the 1:30 tapered-bore execution of the 24100-series spherical roller bearing: the same two barrel-roller rows on a sphered outer raceway as 24152-cc-w33, but the inner-ring bore tapers 1 mm per 30 mm for adapter- or withdrawal-sleeve mounting, as listed by SKF in SKF catalogue PUB BU/P1 17000. On the SKF nameplate, 24152-cck30-w33 follows the ISO 15 convention: 2 for the spherical roller type, 41 for the dimension series 41 (medium OD, maximum width), final digits 52 for the 260 mm bore. Note that K30 means the 1:30 taper used on dimension series 40/41; the more common K means 1:12. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. Speed planning uses two different ceilings: 670 r/min thermal reference and 950 r/min mechanical limiting speed. Because driving up the 1:30 taper consumes radial clearance, K30 executions are commonly ordered with C3 initial clearance so the residual running clearance after mounting matches the cylindrical-bore 24152-cc-w33 on an interference seat.", "applications": [ "large mining crusher main shafts", "wind-turbine main shaft support", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder", "fan and pulley shafts that need periodic bearing removal in the field" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals" ], "pitfalls": [ "At 260 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24100-series series at 260 mm bore (440×180 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 950 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 180 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "Never apply the drive-up or clearance-reduction figures for this 1:30 tapered 24152-cck30-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "Catalogue reference speed and limiting speed are different limits: the 670 r/min reference is a thermal criterion under load, while the 950 r/min limiting value is the mechanical ceiling — observe both.", "The 3086/4800 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 24152 CCK30/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24152-cck30-w33?", "a": "The SKF 24152 CCK30/W33 is a double-row spherical roller bearing with a 1:30 tapered bore, 260 mm nominal bore, 440 mm outer diameter and 180 mm width (10.236 × 17.323 × 7.087 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 3086 kN, C0 4800 kN, Pu 380 kN, reference speed 670 r/min, limiting speed 950 r/min, mass about 120000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K30 suffix mean on 24152-cck30-w33?", "a": "K30 (written CCK30/W33 in the CC execution) marks the 1:30 tapered bore for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder." }, { "q": "Which adapter sleeve fits the 24152-cck30-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 260 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 24152-cck30-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:30 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 24152-cck30-w33 and 24152-cc-w33?", "a": "They share the ISO 15 envelope and the same 3086/4800 kN ratings, but 24152-cck30-w33 has the 1:30 tapered bore for sleeve mounting on a plain shaft, while 24152-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "24152", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) sleeve-mounted execution of 24152; identical ISO 15 envelope, fits AOH24152 withdrawal sleeve on a 240 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.3 withdrawal-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24152-CCK30-W33", "SKF 24152 CCK30/W33", "24152 K" ], "locale_variants": {} }, { "sku": "24056-CCK30-W33", "brand": "SKF", "manufacturer_designation": "SKF 24056 CCK30/W33", "series": "24000-series", "type": "spherical_roller", "d_mm": 280, "D_mm": 420, "B_mm": 140, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2248, "static_load_kN": 3800, "fatigue_load_limit_kN": 285, "max_rpm": 1400, "reference_speed_rpm": 950, "limiting_speed_rpm": 1400, "weight_g": 79000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF 24056 CCK30/W33 in SKF catalogue PUB BU/P1 17000 is a double-row spherical roller bearing with a tapered bore (1:30), intended for an H-series adapter sleeve or AH withdrawal sleeve, with two pressed-steel cages with a floating guide ring and the same 280×420×140 mm ISO 15 outline as its cylindrical-bore counterpart. Reading the designation: the leading 2 marks a spherical roller bearing, the 40 is the ISO 15 dimension series (dimension series 40 (compact OD, maximum width)), and the last two digits encode the 280 mm bore; the 420 mm OD and 140 mm width follow the ISO 15 general plan. Note that K30 means the 1:30 taper used on dimension series 40/41; the more common K means 1:12. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. Speed planning uses two different ceilings: 950 r/min thermal reference and 1,400 r/min mechanical limiting speed. Because driving up the 1:30 taper consumes radial clearance, K30 executions are commonly ordered with C3 initial clearance so the residual running clearance after mounting matches the cylindrical-bore 24056-cc-w33 on an interference seat.", "applications": [ "large mining crusher main shafts", "wind-turbine main shaft support", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder", "fan and pulley shafts that need periodic bearing removal in the field" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals" ], "pitfalls": [ "At 280 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24000-series series at 280 mm bore (420×140 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 140 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "The adapter sleeve is selected by actual shaft diameter, not by the 280 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 24056-cck30-w33 with different sleeves.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 2248/3800 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 24056 CCK30/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24056-cck30-w33?", "a": "The SKF 24056 CCK30/W33 is a double-row spherical roller bearing with a 1:30 tapered bore, 280 mm nominal bore, 420 mm outer diameter and 140 mm width (11.024 × 16.535 × 5.512 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 2248 kN, C0 3800 kN, Pu 285 kN, reference speed 950 r/min, limiting speed 1,400 r/min, mass about 79000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K30 suffix mean on 24056-cck30-w33?", "a": "K30 (written CCK30/W33 in the CC execution) marks the 1:30 tapered bore for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder." }, { "q": "Which adapter sleeve fits the 24056-cck30-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 280 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 24056-cck30-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:30 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 24056-cck30-w33 and 24056-cc-w33?", "a": "They share the ISO 15 envelope and the same 2248/3800 kN ratings, but 24056-cck30-w33 has the 1:30 tapered bore for sleeve mounting on a plain shaft, while 24056-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "24056", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) sleeve-mounted execution of 24056; identical ISO 15 envelope, fits AOH24056 withdrawal sleeve on a 260 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.3 withdrawal-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24056-CCK30-W33", "SKF 24056 CCK30/W33", "24056 K" ], "locale_variants": {} }, { "sku": "24156-CCK30-W33", "brand": "SKF", "manufacturer_designation": "SKF 24156 CCK30/W33", "series": "24100-series", "type": "spherical_roller", "d_mm": 280, "D_mm": 460, "B_mm": 180, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 3183, "static_load_kN": 5100, "fatigue_load_limit_kN": 415, "max_rpm": 900, "reference_speed_rpm": 630, "limiting_speed_rpm": 900, "weight_g": 130000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF lists SKF 24156 CCK30/W33 as the adapter-sleeve execution in the 24100-series range: a 280 mm nominal-bore spherical roller bearing whose 1:30 tapered inner ring is driven up a sleeve, with 460 mm OD and 180 mm width to the ISO 15 envelope. Numbering ties the bearing to its envelope: 24156-cck30-w33 means spherical-roller type, dimension series 41, 280 mm bore — which is why the 460×180 mm outline swaps dimensionally with other ISO 15 bearings of the same code. The K30 in the designation marks the 1:30 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. The 90.0 mm radial section height ((460−280)/2) and 130000 g catalogue mass frame a 280 mm bore bearing rated at 3183 kN C — roughly 11.37 kN of dynamic capacity per millimetre of bore before application factors. At 280 mm bore, dismount after service is by KM locknut reversal or a hydraulic nut on larger sizes; oil-injection grooves on the bigger sleeves let pressurised oil float the 24156-cck30-w33 off the taper without scoring either surface.", "applications": [ "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems" ], "pitfalls": [ "At 280 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24100-series series at 280 mm bore (460×180 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 900 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 180 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 180 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "Never use the tapered-bore CCK30/K30 variant's drive-up figures on this cylindrical-bore 24156-cck30-w33; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 3183/5100 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 24156 CCK30/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24156-cck30-w33?", "a": "The SKF 24156 CCK30/W33 is a double-row spherical roller bearing with a 1:30 tapered bore, 280 mm nominal bore, 460 mm outer diameter and 180 mm width (11.024 × 18.11 × 7.087 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 3183 kN, C0 5100 kN, Pu 415 kN, reference speed 630 r/min, limiting speed 900 r/min, mass about 130000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K30 suffix mean on 24156-cck30-w33?", "a": "K30 (written CCK30/W33 in the CC execution) marks the 1:30 tapered bore for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder." }, { "q": "Which adapter sleeve fits the 24156-cck30-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 280 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 24156-cck30-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:30 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 24156-cck30-w33 and 24156-cc-w33?", "a": "They share the ISO 15 envelope and the same 3183/5100 kN ratings, but 24156-cck30-w33 has the 1:30 tapered bore for sleeve mounting on a plain shaft, while 24156-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "24156", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) sleeve-mounted execution of 24156; identical ISO 15 envelope, fits AOH24156 withdrawal sleeve on a 260 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.3 withdrawal-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24156-CCK30-W33", "SKF 24156 CCK30/W33", "24156 K" ], "locale_variants": {} }, { "sku": "24060-CCK30-W33", "brand": "SKF", "manufacturer_designation": "SKF 24060 CCK30/W33", "series": "24000-series", "type": "spherical_roller", "d_mm": 300, "D_mm": 460, "B_mm": 160, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2821, "static_load_kN": 4750, "fatigue_load_limit_kN": 355, "max_rpm": 1200, "reference_speed_rpm": 850, "limiting_speed_rpm": 1200, "weight_g": 110000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The SKF 24060 CCK30/W33 is a 300×460×160 mm spherical roller bearing with a 1:30 tapered bore — SKF catalogue execution for sleeve mounting on a 300 mm plain shaft, retaining the double-row self-aligning barrel-roller design. On the SKF nameplate, 24060-cck30-w33 follows the ISO 15 convention: 2 for the spherical roller type, 40 for the dimension series 40 (compact OD, maximum width), final digits 60 for the 300 mm bore. The K30 in the designation marks the 1:30 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. Catalogue mass 110000 g for the 300×460×160 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. After drive-up, re-check radial clearance and then swing the outer ring through its self-aligning range: the sphered raceway of the 24060-cck30-w33 must still tilt ≈ 0.5–2.5° freely — a joint that binds after sleeve mounting signals excessive drive-up or a cocked sleeve.", "applications": [ "large dredger and marine winch drums", "steel-plant continuous-caster segments", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems" ], "pitfalls": [ "At 300 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24000-series series at 300 mm bore (460×160 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.", "The 24060-cck30-w33 and its cylindrical-bore counterpart 24060-cc-w33 share envelope and load ratings (2821/4750 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "Never apply the drive-up or clearance-reduction figures for this 1:30 tapered 24060-cck30-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 2821/4750 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 24060 CCK30/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24060-cck30-w33?", "a": "The SKF 24060 CCK30/W33 is a double-row spherical roller bearing with a 1:30 tapered bore, 300 mm nominal bore, 460 mm outer diameter and 160 mm width (11.811 × 18.11 × 6.299 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 2821 kN, C0 4750 kN, Pu 355 kN, reference speed 850 r/min, limiting speed 1,200 r/min, mass about 110000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K30 suffix mean on 24060-cck30-w33?", "a": "K30 (written CCK30/W33 in the CC execution) marks the 1:30 tapered bore for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder." }, { "q": "Which adapter sleeve fits the 24060-cck30-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 300 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 24060-cck30-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:30 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 24060-cck30-w33 and 24060-cc-w33?", "a": "They share the ISO 15 envelope and the same 2821/4750 kN ratings, but 24060-cck30-w33 has the 1:30 tapered bore for sleeve mounting on a plain shaft, while 24060-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "24060", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) sleeve-mounted execution of 24060; identical ISO 15 envelope, fits AOH24060 withdrawal sleeve on a 280 mm shaft." }, { "equiv_sku": "C4060-M", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 4060 M shares the 300×460×160 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C4060-K30M", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 4060 K30M shares the 300×460×160 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.3 withdrawal-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24060-CCK30-W33", "SKF 24060 CCK30/W33", "24060 K" ], "locale_variants": {} }, { "sku": "24160-CCK30-W33", "brand": "SKF", "manufacturer_designation": "SKF 24160 CCK30/W33", "series": "24100-series", "type": "spherical_roller", "d_mm": 300, "D_mm": 500, "B_mm": 200, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 3876, "static_load_kN": 6300, "fatigue_load_limit_kN": 465, "max_rpm": 800, "reference_speed_rpm": 560, "limiting_speed_rpm": 800, "weight_g": 180000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For sleeve mounting on a 300 mm shaft, SKF order number SKF 24160 CCK30/W33 is the 1:30 tapered-bore spherical roller bearing in the 24100-series family (dimension series 41 (medium OD, maximum width)); the cylindrical-bore equivalent is a separate order number, 24160-cc-w33. Reading the designation: the leading 2 marks a spherical roller bearing, the 41 is the ISO 15 dimension series (dimension series 41 (medium OD, maximum width)), and the last two digits encode the 300 mm bore; the 500 mm OD and 200 mm width follow the ISO 15 general plan. Reading the suffix on 24160-cck30-w33, the K30 (or EK/CCK30) element changes only the bore — 1:30 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 24160-cc-w33. At 560 r/min reference speed the 100.0 mm-section 24160-cck30-w33 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 800 r/min as the mechanical ceiling. On an H adapter sleeve the 300 mm shaft seat only needs an h9 plain journal; slide the sleeve into the 24160-cck30-w33 inner ring, tighten the KM nut against the MB washer until the catalogue clearance-reduction value is reached, then lock the washer tab.", "applications": [ "large induced-draft fan rotors", "SAG and ball-mill drive shafts", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "smearing on the roller-raceway contact during skid starts below the minimum load" ], "pitfalls": [ "At 300 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24100-series series at 300 mm bore (500×200 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 800 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.", "The 24160-cck30-w33 and its cylindrical-bore counterpart 24160-cc-w33 share envelope and load ratings (3876/6300 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 200 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "Shaft and housing fillets must clear the bearing chamfer so the 200 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 3876/6300 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 24160 CCK30/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24160-cck30-w33?", "a": "The SKF 24160 CCK30/W33 is a double-row spherical roller bearing with a 1:30 tapered bore, 300 mm nominal bore, 500 mm outer diameter and 200 mm width (11.811 × 19.685 × 7.874 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 3876 kN, C0 6300 kN, Pu 465 kN, reference speed 560 r/min, limiting speed 800 r/min, mass about 180000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K30 suffix mean on 24160-cck30-w33?", "a": "K30 (written CCK30/W33 in the CC execution) marks the 1:30 tapered bore for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder." }, { "q": "Which adapter sleeve fits the 24160-cck30-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 300 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 24160-cck30-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:30 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 24160-cck30-w33 and 24160-cc-w33?", "a": "They share the ISO 15 envelope and the same 3876/6300 kN ratings, but 24160-cck30-w33 has the 1:30 tapered bore for sleeve mounting on a plain shaft, while 24160-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "24160", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) sleeve-mounted execution of 24160; identical ISO 15 envelope, fits AOH24160 withdrawal sleeve on a 280 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.3 withdrawal-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24160-CCK30-W33", "SKF 24160 CCK30/W33", "24160 K" ], "locale_variants": {} }, { "sku": "24064-CCK30-W33", "brand": "SKF", "manufacturer_designation": "SKF 24064 CCK30/W33", "series": "24000-series", "type": "spherical_roller", "d_mm": 320, "D_mm": 480, "B_mm": 160, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2969, "static_load_kN": 5100, "fatigue_load_limit_kN": 400, "max_rpm": 1200, "reference_speed_rpm": 800, "limiting_speed_rpm": 1200, "weight_g": 115000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For sleeve mounting on a 320 mm shaft, SKF order number SKF 24064 CCK30/W33 is the 1:30 tapered-bore spherical roller bearing in the 24000-series family (dimension series 40 (compact OD, maximum width)); the cylindrical-bore equivalent is a separate order number, 24064-cc-w33. Reading the designation: the leading 2 marks a spherical roller bearing, the 40 is the ISO 15 dimension series (dimension series 40 (compact OD, maximum width)), and the last two digits encode the 320 mm bore; the 480 mm OD and 160 mm width follow the ISO 15 general plan. Reading the suffix on 24064-cck30-w33, the K30 (or EK/CCK30) element changes only the bore — 1:30 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 24064-cc-w33. Catalogue mass 115000 g for the 320×480×160 mm open execution covers the two pressed-steel cages with a floating guide ring; tapered-bore and sealed variants differ in mass and carry their own order numbers. For shafts with a locating shoulder, use an AH withdrawal sleeve instead of an adapter sleeve: the bearing presses against the shoulder and the sleeve is drawn out for dismounting, making the 24064-cck30-w33 removable without an induction heater.", "applications": [ "large dredger and marine winch drums", "steel-plant continuous-caster segments", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "At 320 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24000-series series at 320 mm bore (480×160 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 160 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 160 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "The 115000 g mass and 160 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of 24064-cck30-w33.", "The 2969/5100 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 24064 CCK30/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24064-cck30-w33?", "a": "The SKF 24064 CCK30/W33 is a double-row spherical roller bearing with a 1:30 tapered bore, 320 mm nominal bore, 480 mm outer diameter and 160 mm width (12.598 × 18.898 × 6.299 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 2969 kN, C0 5100 kN, Pu 400 kN, reference speed 800 r/min, limiting speed 1,200 r/min, mass about 115000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K30 suffix mean on 24064-cck30-w33?", "a": "K30 (written CCK30/W33 in the CC execution) marks the 1:30 tapered bore for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder." }, { "q": "Which adapter sleeve fits the 24064-cck30-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 320 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 24064-cck30-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:30 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 24064-cck30-w33 and 24064-cc-w33?", "a": "They share the ISO 15 envelope and the same 2969/5100 kN ratings, but 24064-cck30-w33 has the 1:30 tapered bore for sleeve mounting on a plain shaft, while 24064-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "24064", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) sleeve-mounted execution of 24064; identical ISO 15 envelope, fits AOH24064 withdrawal sleeve on a 300 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.3 withdrawal-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24064-CCK30-W33", "SKF 24064 CCK30/W33", "24064 K" ], "locale_variants": {} }, { "sku": "24164-CCK30-W33", "brand": "SKF", "manufacturer_designation": "SKF 24164 CCK30/W33", "series": "24100-series", "type": "spherical_roller", "d_mm": 320, "D_mm": 540, "B_mm": 218, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4395, "static_load_kN": 7100, "fatigue_load_limit_kN": 510, "max_rpm": 700, "reference_speed_rpm": 500, "limiting_speed_rpm": 700, "weight_g": 225000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The SKF 24164 CCK30/W33 is a 320×540×218 mm spherical roller bearing with a 1:30 tapered bore — SKF catalogue execution for sleeve mounting on a 320 mm plain shaft, retaining the double-row self-aligning barrel-roller design. Numbering ties the bearing to its envelope: 24164-cck30-w33 means spherical-roller type, dimension series 41, 320 mm bore — which is why the 540×218 mm outline swaps dimensionally with other ISO 15 bearings of the same code. Sleeve mounting is why the K30 execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. At 500 r/min reference speed the 110.0 mm-section 24164-cck30-w33 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 700 r/min as the mechanical ceiling. Because driving up the 1:30 taper consumes radial clearance, K30 executions are commonly ordered with C3 initial clearance so the residual running clearance after mounting matches the cylindrical-bore 24164-cc-w33 on an interference seat.", "applications": [ "large induced-draft fan rotors", "SAG and ball-mill drive shafts", "split-housing plummer block arrangements with bearings swapped in situ", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still" ], "pitfalls": [ "At 320 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24100-series series at 320 mm bore (540×218 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 700 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 218 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "Never apply the drive-up or clearance-reduction figures for this 1:30 tapered 24164-cck30-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 24164-cck30-w33 pits long before its L10 life.", "The 4395/7100 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 24164 CCK30/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24164-cck30-w33?", "a": "The SKF 24164 CCK30/W33 is a double-row spherical roller bearing with a 1:30 tapered bore, 320 mm nominal bore, 540 mm outer diameter and 218 mm width (12.598 × 21.26 × 8.583 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 4395 kN, C0 7100 kN, Pu 510 kN, reference speed 500 r/min, limiting speed 700 r/min, mass about 225000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K30 suffix mean on 24164-cck30-w33?", "a": "K30 (written CCK30/W33 in the CC execution) marks the 1:30 tapered bore for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder." }, { "q": "Which adapter sleeve fits the 24164-cck30-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 320 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 24164-cck30-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:30 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 24164-cck30-w33 and 24164-cc-w33?", "a": "They share the ISO 15 envelope and the same 4395/7100 kN ratings, but 24164-cck30-w33 has the 1:30 tapered bore for sleeve mounting on a plain shaft, while 24164-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "24164", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) sleeve-mounted execution of 24164; identical ISO 15 envelope, fits AOH24164 withdrawal sleeve on a 300 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.3 withdrawal-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24164-CCK30-W33", "SKF 24164 CCK30/W33", "24164 K" ], "locale_variants": {} }, { "sku": "24068-CCK30-W33", "brand": "SKF", "manufacturer_designation": "SKF 24068 CCK30/W33", "series": "24000-series", "type": "spherical_roller", "d_mm": 340, "D_mm": 520, "B_mm": 180, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 3621, "static_load_kN": 6200, "fatigue_load_limit_kN": 475, "max_rpm": 1100, "reference_speed_rpm": 750, "limiting_speed_rpm": 1100, "weight_g": 160000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The SKF 24068 CCK30/W33 is a 340×520×180 mm spherical roller bearing with a 1:30 tapered bore — SKF catalogue execution for sleeve mounting on a 340 mm plain shaft, retaining the double-row self-aligning barrel-roller design. The code breaks down as type digit 2 (double-row spherical roller), dimension series 40 (dimension series 40 (compact OD, maximum width)), and bore code 68 = 340 mm; dimensions 340×520×180 mm therefore match the ISO 15 envelope. Sleeve mounting is why the K30 execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. The 475 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.71 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. On an H adapter sleeve the 340 mm shaft seat only needs an h9 plain journal; slide the sleeve into the 24068-cck30-w33 inner ring, tighten the KM nut against the MB washer until the catalogue clearance-reduction value is reached, then lock the washer tab.", "applications": [ "steel-plant continuous-caster segments", "large induced-draft fan rotors", "split-housing plummer block arrangements with bearings swapped in situ", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "At 340 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24000-series series at 340 mm bore (520×180 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 180 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "Never apply the drive-up or clearance-reduction figures for this 1:30 tapered 24068-cck30-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "The 24068-cck30-w33 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 3621/6200 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The 3621/6200 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 24068 CCK30/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24068-cck30-w33?", "a": "The SKF 24068 CCK30/W33 is a double-row spherical roller bearing with a 1:30 tapered bore, 340 mm nominal bore, 520 mm outer diameter and 180 mm width (13.386 × 20.472 × 7.087 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 3621 kN, C0 6200 kN, Pu 475 kN, reference speed 750 r/min, limiting speed 1,100 r/min, mass about 160000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K30 suffix mean on 24068-cck30-w33?", "a": "K30 (written CCK30/W33 in the CC execution) marks the 1:30 tapered bore for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder." }, { "q": "Which adapter sleeve fits the 24068-cck30-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 340 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 24068-cck30-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:30 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 24068-cck30-w33 and 24068-cc-w33?", "a": "They share the ISO 15 envelope and the same 3621/6200 kN ratings, but 24068-cck30-w33 has the 1:30 tapered bore for sleeve mounting on a plain shaft, while 24068-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "24068", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) sleeve-mounted execution of 24068; identical ISO 15 envelope, fits AOH24068 withdrawal sleeve on a 320 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.3 withdrawal-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24068-CCK30-W33", "SKF 24068 CCK30/W33", "24068 K" ], "locale_variants": {} }, { "sku": "24168-ECCK30J-W33", "brand": "SKF", "manufacturer_designation": "SKF 24168 ECCK30J/W33", "series": "24100-series", "type": "spherical_roller", "d_mm": 340, "D_mm": 580, "B_mm": 243, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5487, "static_load_kN": 8650, "fatigue_load_limit_kN": 630, "max_rpm": 630, "reference_speed_rpm": 430, "limiting_speed_rpm": 630, "weight_g": 295000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF lists SKF 24168 ECCK30J/W33 as the adapter-sleeve execution in the 24100-series range: a 340 mm nominal-bore spherical roller bearing whose 1:30 tapered inner ring is driven up a sleeve, with 580 mm OD and 243 mm width to the ISO 15 envelope. On the SKF nameplate, 24168-ecck30j-w33 follows the ISO 15 convention: 2 for the spherical roller type, 41 for the dimension series 41 (medium OD, maximum width), final digits 68 for the 340 mm bore. Sleeve mounting is why the K30 execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. With C 5487 kN and C0 8650 kN, the 24168-ecck30j-w33 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. Over-driving the 24168-ecck30j-w33 up its sleeve pinches radial clearance below the residual minimum and can crack the inner ring in service; under-driving leaves the sleeve seat loose, so the ring creeps and frets the sleeve — measure, do not estimate.", "applications": [ "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "split-housing plummer block arrangements with bearings swapped in situ", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "At 340 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24100-series series at 340 mm bore (580×243 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 630 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.", "The 24168-ecck30j-w33 and its cylindrical-bore counterpart 24168-ecck30j-w33 share envelope and load ratings (5487/8650 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 243 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 24168-ecck30j-w33 pits long before its L10 life.", "The 5487/8650 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 24168 ECCK30J/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24168-ecck30j-w33?", "a": "The SKF 24168 ECCK30J/W33 is a double-row spherical roller bearing with a 1:30 tapered bore, 340 mm nominal bore, 580 mm outer diameter and 243 mm width (13.386 × 22.835 × 9.567 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 5487 kN, C0 8650 kN, Pu 630 kN, reference speed 430 r/min, limiting speed 630 r/min, mass about 295000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K30 suffix mean on 24168-ecck30j-w33?", "a": "K30 (written CCK30/W33 in the CC execution) marks the 1:30 tapered bore for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder." }, { "q": "Which adapter sleeve fits the 24168-ecck30j-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 340 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 24168-ecck30j-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:30 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 24168-ecck30j-w33 and 24168-ecck30j-w33?", "a": "They share the ISO 15 envelope and the same 5487/8650 kN ratings, but 24168-ecck30j-w33 has the 1:30 tapered bore for sleeve mounting on a plain shaft, while 24168-ecck30j-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "24168", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) sleeve-mounted execution of 24168; identical ISO 15 envelope, fits AOH24168 withdrawal sleeve on a 320 mm shaft." }, { "equiv_sku": "C4168-K30MB", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 4168 K30MB shares the 340×580×243 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.3 withdrawal-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24168-ECCK30J-W33", "SKF 24168 ECCK30J/W33", "24168 K" ], "locale_variants": {} }, { "sku": "24072-CCK30-W33", "brand": "SKF", "manufacturer_designation": "SKF 24072 CCK30/W33", "series": "24000-series", "type": "spherical_roller", "d_mm": 360, "D_mm": 540, "B_mm": 180, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 3705, "static_load_kN": 6550, "fatigue_load_limit_kN": 490, "max_rpm": 1000, "reference_speed_rpm": 700, "limiting_speed_rpm": 1000, "weight_g": 165000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 24072-cck30-w33 denotes the tapered-bore version (K30 suffix, taper 1:30) of the 24000-series spherical roller bearing: dimensioned 360×540×180 mm, it seats on an adapter or withdrawal sleeve rather than directly on a machined journal. Numbering ties the bearing to its envelope: 24072-cck30-w33 means spherical-roller type, dimension series 40, 360 mm bore — which is why the 540×180 mm outline swaps dimensionally with other ISO 15 bearings of the same code. Note that K30 means the 1:30 taper used on dimension series 40/41; the more common K means 1:12. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. The 90.0 mm radial section height ((540−360)/2) and 165000 g catalogue mass frame a 360 mm bore bearing rated at 3705 kN C — roughly 10.29 kN of dynamic capacity per millimetre of bore before application factors. After drive-up, re-check radial clearance and then swing the outer ring through its self-aligning range: the sphered raceway of the 24072-cck30-w33 must still tilt ≈ 0.5–2.5° freely — a joint that binds after sleeve mounting signals excessive drive-up or a cocked sleeve.", "applications": [ "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat", "split-housing plummer block arrangements with bearings swapped in situ" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals" ], "pitfalls": [ "At 360 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24000-series series at 360 mm bore (540×180 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.", "The 24072-cck30-w33 and its cylindrical-bore counterpart 24072-cc-w33 share envelope and load ratings (3705/6550 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "Never apply the drive-up or clearance-reduction figures for this 1:30 tapered 24072-cck30-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "Catalogue reference speed and limiting speed are different limits: the 700 r/min reference is a thermal criterion under load, while the 1,000 r/min limiting value is the mechanical ceiling — observe both.", "The 3705/6550 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 24072 CCK30/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24072-cck30-w33?", "a": "The SKF 24072 CCK30/W33 is a double-row spherical roller bearing with a 1:30 tapered bore, 360 mm nominal bore, 540 mm outer diameter and 180 mm width (14.173 × 21.26 × 7.087 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 3705 kN, C0 6550 kN, Pu 490 kN, reference speed 700 r/min, limiting speed 1,000 r/min, mass about 165000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K30 suffix mean on 24072-cck30-w33?", "a": "K30 (written CCK30/W33 in the CC execution) marks the 1:30 tapered bore for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder." }, { "q": "Which adapter sleeve fits the 24072-cck30-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 360 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 24072-cck30-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:30 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 24072-cck30-w33 and 24072-cc-w33?", "a": "They share the ISO 15 envelope and the same 3705/6550 kN ratings, but 24072-cck30-w33 has the 1:30 tapered bore for sleeve mounting on a plain shaft, while 24072-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "24072", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) sleeve-mounted execution of 24072; identical ISO 15 envelope, fits AOH24072 withdrawal sleeve on a 340 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.3 withdrawal-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24072-CCK30-W33", "SKF 24072 CCK30/W33", "24072 K" ], "locale_variants": {} }, { "sku": "24172-ECCK30J-W33", "brand": "SKF", "manufacturer_designation": "SKF 24172 ECCK30J/W33", "series": "24100-series", "type": "spherical_roller", "d_mm": 360, "D_mm": 600, "B_mm": 243, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 5737, "static_load_kN": 9300, "fatigue_load_limit_kN": 670, "max_rpm": 600, "reference_speed_rpm": 400, "limiting_speed_rpm": 600, "weight_g": 295000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 24172-ecck30j-w33 denotes the tapered-bore version (K30 suffix, taper 1:30) of the 24100-series spherical roller bearing: dimensioned 360×600×243 mm, it seats on an adapter or withdrawal sleeve rather than directly on a machined journal. Numbering ties the bearing to its envelope: 24172-ecck30j-w33 means spherical-roller type, dimension series 41, 360 mm bore — which is why the 600×243 mm outline swaps dimensionally with other ISO 15 bearings of the same code. Sleeve mounting is why the K30 execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. The 670 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.62 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. On an H adapter sleeve the 360 mm shaft seat only needs an h9 plain journal; slide the sleeve into the 24172-ecck30j-w33 inner ring, tighten the KM nut against the MB washer until the catalogue clearance-reduction value is reached, then lock the washer tab.", "applications": [ "steel-plant continuous-caster segments", "large induced-draft fan rotors", "fan and pulley shafts that need periodic bearing removal in the field", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "At 360 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24100-series series at 360 mm bore (600×243 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 600 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.", "Never apply the drive-up or clearance-reduction figures for this 1:30 tapered 24172-ecck30j-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "The 24172-ecck30j-w33 and its cylindrical-bore counterpart 24172-ecck30j-w33 share envelope and load ratings (5737/9300 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "The 24172-ecck30j-w33 shares its ISO 15 envelope across brands, but internal geometry differs — SKF load ratings in this row are 5737/9300 kN; another maker's same-size bearing may rate higher or lower, so do not interchange on envelope alone.", "The 5737/9300 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 24172 ECCK30J/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24172-ecck30j-w33?", "a": "The SKF 24172 ECCK30J/W33 is a double-row spherical roller bearing with a 1:30 tapered bore, 360 mm nominal bore, 600 mm outer diameter and 243 mm width (14.173 × 23.622 × 9.567 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 5737 kN, C0 9300 kN, Pu 670 kN, reference speed 400 r/min, limiting speed 600 r/min, mass about 295000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K30 suffix mean on 24172-ecck30j-w33?", "a": "K30 (written CCK30/W33 in the CC execution) marks the 1:30 tapered bore for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder." }, { "q": "Which adapter sleeve fits the 24172-ecck30j-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 360 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 24172-ecck30j-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:30 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 24172-ecck30j-w33 and 24172-ecck30j-w33?", "a": "They share the ISO 15 envelope and the same 5737/9300 kN ratings, but 24172-ecck30j-w33 has the 1:30 tapered bore for sleeve mounting on a plain shaft, while 24172-ecck30j-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "24172", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) sleeve-mounted execution of 24172; identical ISO 15 envelope, fits AOH24172 withdrawal sleeve on a 340 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.3 withdrawal-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24172-ECCK30J-W33", "SKF 24172 ECCK30J/W33", "24172 K" ], "locale_variants": {} }, { "sku": "24076-CCK30-W33", "brand": "SKF", "manufacturer_designation": "SKF 24076 CCK30/W33", "series": "24000-series", "type": "spherical_roller", "d_mm": 380, "D_mm": 560, "B_mm": 180, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 3786, "static_load_kN": 6800, "fatigue_load_limit_kN": 475, "max_rpm": 950, "reference_speed_rpm": 670, "limiting_speed_rpm": 950, "weight_g": 170000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF 24076 CCK30/W33 in SKF catalogue PUB BU/P1 17000 is a double-row spherical roller bearing with a tapered bore (1:30), intended for an H-series adapter sleeve or AH withdrawal sleeve, with two pressed-steel cages with a floating guide ring and the same 380×560×180 mm ISO 15 outline as its cylindrical-bore counterpart. The code breaks down as type digit 2 (double-row spherical roller), dimension series 40 (dimension series 40 (compact OD, maximum width)), and bore code 76 = 380 mm; dimensions 380×560×180 mm therefore match the ISO 15 envelope. The K30 in the designation marks the 1:30 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. The 90.0 mm radial section height ((560−380)/2) and 170000 g catalogue mass frame a 380 mm bore bearing rated at 3786 kN C — roughly 9.96 kN of dynamic capacity per millimetre of bore before application factors. For shafts with a locating shoulder, use an AH withdrawal sleeve instead of an adapter sleeve: the bearing presses against the shoulder and the sleeve is drawn out for dismounting, making the 24076-cck30-w33 removable without an induction heater.", "applications": [ "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "fan and pulley shafts that need periodic bearing removal in the field", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems" ], "pitfalls": [ "At 380 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24000-series series at 380 mm bore (560×180 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 180 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 180 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "Never use the tapered-bore CCK30/K30 variant's drive-up figures on this cylindrical-bore 24076-cck30-w33; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 3786/6800 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 24076 CCK30/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24076-cck30-w33?", "a": "The SKF 24076 CCK30/W33 is a double-row spherical roller bearing with a 1:30 tapered bore, 380 mm nominal bore, 560 mm outer diameter and 180 mm width (14.961 × 22.047 × 7.087 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 3786 kN, C0 6800 kN, Pu 475 kN, reference speed 670 r/min, limiting speed 950 r/min, mass about 170000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K30 suffix mean on 24076-cck30-w33?", "a": "K30 (written CCK30/W33 in the CC execution) marks the 1:30 tapered bore for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder." }, { "q": "Which adapter sleeve fits the 24076-cck30-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 380 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 24076-cck30-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:30 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 24076-cck30-w33 and 24076-cc-w33?", "a": "They share the ISO 15 envelope and the same 3786/6800 kN ratings, but 24076-cck30-w33 has the 1:30 tapered bore for sleeve mounting on a plain shaft, while 24076-cc-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "24076", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) sleeve-mounted execution of 24076; identical ISO 15 envelope, fits AOH24076 withdrawal sleeve on a 360 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.3 withdrawal-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24076-CCK30-W33", "SKF 24076 CCK30/W33", "24076 K" ], "locale_variants": {} }, { "sku": "24176-ECAK30-W33", "brand": "SKF", "manufacturer_designation": "SKF 24176 ECAK30/W33", "series": "24100-series", "type": "spherical_roller", "d_mm": 380, "D_mm": 620, "B_mm": 243, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass_machined_M1", "dynamic_load_kN": 5936, "static_load_kN": 9800, "fatigue_load_limit_kN": 710, "max_rpm": 530, "reference_speed_rpm": 360, "limiting_speed_rpm": 530, "weight_g": 325000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF lists SKF 24176 ECAK30/W33 as the adapter-sleeve execution in the 24100-series range: a 380 mm nominal-bore spherical roller bearing whose 1:30 tapered inner ring is driven up a sleeve, with 620 mm OD and 243 mm width to the ISO 15 envelope. Digit by digit, 24176-ecak30-w33 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 41, and bore reference 76 resolving to 380 mm; 620 mm OD and 243 mm width are the matching ISO 15 boundary values. Note that K30 means the 1:30 taper used on dimension series 40/41; the more common K means 1:12. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. At 360 r/min reference speed the 120.0 mm-section 24176-ecak30-w33 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 530 r/min as the mechanical ceiling. For shafts with a locating shoulder, use an AH withdrawal sleeve instead of an adapter sleeve: the bearing presses against the shoulder and the sleeve is drawn out for dismounting, making the 24176-ecak30-w33 removable without an induction heater.", "applications": [ "large induced-draft fan rotors", "SAG and ball-mill drive shafts", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder", "fan and pulley shafts that need periodic bearing removal in the field" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "At 380 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24100-series series at 380 mm bore (620×243 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 530 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.", "The adapter sleeve is selected by actual shaft diameter, not by the 380 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 24176-ecak30-w33 with different sleeves.", "The 24176-ecak30-w33 and its cylindrical-bore counterpart 24176-ecak30-w33 share envelope and load ratings (5936/9800 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "Shaft and housing fillets must clear the bearing chamfer so the 243 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 5936/9800 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 24176 ECAK30/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24176-ecak30-w33?", "a": "The SKF 24176 ECAK30/W33 is a double-row spherical roller bearing with a 1:30 tapered bore, 380 mm nominal bore, 620 mm outer diameter and 243 mm width (14.961 × 24.409 × 9.567 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 5936 kN, C0 9800 kN, Pu 710 kN, reference speed 360 r/min, limiting speed 530 r/min, mass about 325000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K30 suffix mean on 24176-ecak30-w33?", "a": "K30 (written CCK30/W33 in the CC execution) marks the 1:30 tapered bore for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder." }, { "q": "Which adapter sleeve fits the 24176-ecak30-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 380 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 24176-ecak30-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:30 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 24176-ecak30-w33 and 24176-ecak30-w33?", "a": "They share the ISO 15 envelope and the same 5936/9800 kN ratings, but 24176-ecak30-w33 has the 1:30 tapered bore for sleeve mounting on a plain shaft, while 24176-ecak30-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "24176", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) sleeve-mounted execution of 24176; identical ISO 15 envelope, fits AOH24176 withdrawal sleeve on a 360 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.3 withdrawal-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24176-ECAK30-W33", "SKF 24176 ECAK30/W33", "24176 K" ], "locale_variants": {} }, { "sku": "24080-ECCK30J-W33", "brand": "SKF", "manufacturer_designation": "SKF 24080 ECCK30J/W33", "series": "24000-series", "type": "spherical_roller", "d_mm": 400, "D_mm": 600, "B_mm": 200, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 4507, "static_load_kN": 8000, "fatigue_load_limit_kN": 560, "max_rpm": 900, "reference_speed_rpm": 630, "limiting_speed_rpm": 900, "weight_g": 220000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "24080-ecck30j-w33 is the 1:30 tapered-bore execution of the 24000-series spherical roller bearing: the same two barrel-roller rows on a sphered outer raceway as 24080-ecck30j-w33, but the inner-ring bore tapers 1 mm per 30 mm for adapter- or withdrawal-sleeve mounting, as listed by SKF in SKF catalogue PUB BU/P1 17000. Reading the designation: the leading 2 marks a spherical roller bearing, the 40 is the ISO 15 dimension series (dimension series 40 (compact OD, maximum width)), and the last two digits encode the 400 mm bore; the 600 mm OD and 200 mm width follow the ISO 15 general plan. Reading the suffix on 24080-ecck30j-w33, the K30 (or EK/CCK30) element changes only the bore — 1:30 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 24080-ecck30j-w33. The 100.0 mm radial section height ((600−400)/2) and 220000 g catalogue mass frame a 400 mm bore bearing rated at 4507 kN C — roughly 11.27 kN of dynamic capacity per millimetre of bore before application factors. Because driving up the 1:30 taper consumes radial clearance, K30 executions are commonly ordered with C3 initial clearance so the residual running clearance after mounting matches the cylindrical-bore 24080-ecck30j-w33 on an interference seat.", "applications": [ "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder", "fan and pulley shafts that need periodic bearing removal in the field" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "At 400 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24000-series series at 400 mm bore (600×200 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.", "Never apply the drive-up or clearance-reduction figures for this 1:30 tapered 24080-ecck30j-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 200 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "Shaft and housing fillets must clear the bearing chamfer so the 200 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 4507/8000 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 24080 ECCK30J/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24080-ecck30j-w33?", "a": "The SKF 24080 ECCK30J/W33 is a double-row spherical roller bearing with a 1:30 tapered bore, 400 mm nominal bore, 600 mm outer diameter and 200 mm width (15.748 × 23.622 × 7.874 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 4507 kN, C0 8000 kN, Pu 560 kN, reference speed 630 r/min, limiting speed 900 r/min, mass about 220000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K30 suffix mean on 24080-ecck30j-w33?", "a": "K30 (written CCK30/W33 in the CC execution) marks the 1:30 tapered bore for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder." }, { "q": "Which adapter sleeve fits the 24080-ecck30j-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 400 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 24080-ecck30j-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:30 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 24080-ecck30j-w33 and 24080-ecck30j-w33?", "a": "They share the ISO 15 envelope and the same 4507/8000 kN ratings, but 24080-ecck30j-w33 has the 1:30 tapered bore for sleeve mounting on a plain shaft, while 24080-ecck30j-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "24080", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) sleeve-mounted execution of 24080; identical ISO 15 envelope, fits AOH24080 withdrawal sleeve on a 380 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.3 withdrawal-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24080-ECCK30J-W33", "SKF 24080 ECCK30J/W33", "24080 K" ], "locale_variants": {} }, { "sku": "24180-ECAK30-W33", "brand": "SKF", "manufacturer_designation": "SKF 24180 ECAK30/W33", "series": "24100-series", "type": "spherical_roller", "d_mm": 400, "D_mm": 650, "B_mm": 250, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass_machined_M1", "dynamic_load_kN": 6331, "static_load_kN": 10600, "fatigue_load_limit_kN": 735, "max_rpm": 500, "reference_speed_rpm": 340, "limiting_speed_rpm": 500, "weight_g": 365000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The SKF 24180 ECAK30/W33 is a 400×650×250 mm spherical roller bearing with a 1:30 tapered bore — SKF catalogue execution for sleeve mounting on a 400 mm plain shaft, retaining the double-row self-aligning barrel-roller design. Numbering ties the bearing to its envelope: 24180-ecak30-w33 means spherical-roller type, dimension series 41, 400 mm bore — which is why the 650×250 mm outline swaps dimensionally with other ISO 15 bearings of the same code. Sleeve mounting is why the K30 execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. With C 6331 kN and C0 10600 kN, the 24180-ecak30-w33 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. At 400 mm bore, dismount after service is by KM locknut reversal or a hydraulic nut on larger sizes; oil-injection grooves on the bigger sleeves let pressurised oil float the 24180-ecak30-w33 off the taper without scoring either surface.", "applications": [ "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "split-housing plummer block arrangements with bearings swapped in situ", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "fretting corrosion on a loose rotating shaft seat or in vibratory stand-still" ], "pitfalls": [ "At 400 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24100-series series at 400 mm bore (650×250 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 500 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.", "The 24180-ecak30-w33 and its cylindrical-bore counterpart 24180-ecak30-w33 share envelope and load ratings (6331/10600 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 250 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "Shaft and housing fillets must clear the bearing chamfer so the 250 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 6331/10600 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 24180 ECAK30/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24180-ecak30-w33?", "a": "The SKF 24180 ECAK30/W33 is a double-row spherical roller bearing with a 1:30 tapered bore, 400 mm nominal bore, 650 mm outer diameter and 250 mm width (15.748 × 25.591 × 9.843 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 6331 kN, C0 10600 kN, Pu 735 kN, reference speed 340 r/min, limiting speed 500 r/min, mass about 365000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K30 suffix mean on 24180-ecak30-w33?", "a": "K30 (written CCK30/W33 in the CC execution) marks the 1:30 tapered bore for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder." }, { "q": "Which adapter sleeve fits the 24180-ecak30-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 400 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 24180-ecak30-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:30 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 24180-ecak30-w33 and 24180-ecak30-w33?", "a": "They share the ISO 15 envelope and the same 6331/10600 kN ratings, but 24180-ecak30-w33 has the 1:30 tapered bore for sleeve mounting on a plain shaft, while 24180-ecak30-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "24180", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) sleeve-mounted execution of 24180; identical ISO 15 envelope, fits AOH24180 withdrawal sleeve on a 380 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.3 withdrawal-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24180-ECAK30-W33", "SKF 24180 ECAK30/W33", "24180 K" ], "locale_variants": {} }, { "sku": "24084-ECAK30-W33", "brand": "SKF", "manufacturer_designation": "SKF 24084 ECAK30/W33", "series": "24000-series", "type": "spherical_roller", "d_mm": 420, "D_mm": 620, "B_mm": 200, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass_machined_M1", "dynamic_load_kN": 4610, "static_load_kN": 8300, "fatigue_load_limit_kN": 585, "max_rpm": 900, "reference_speed_rpm": 530, "limiting_speed_rpm": 900, "weight_g": 230000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For sleeve mounting on a 420 mm shaft, SKF order number SKF 24084 ECAK30/W33 is the 1:30 tapered-bore spherical roller bearing in the 24000-series family (dimension series 40 (compact OD, maximum width)); the cylindrical-bore equivalent is a separate order number, 24084-ecak30-w33. On the SKF nameplate, 24084-ecak30-w33 follows the ISO 15 convention: 2 for the spherical roller type, 40 for the dimension series 40 (compact OD, maximum width), final digits 84 for the 420 mm bore. Reading the suffix on 24084-ecak30-w33, the K30 (or EK/CCK30) element changes only the bore — 1:30 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 24084-ecak30-w33. With C 4610 kN and C0 8300 kN, the 24084-ecak30-w33 load check covers radial plus moderate axial in either direction — but below the minimum load the rollers skid, so verify P ≥ 0.01·C0 at the lightest operating point. Mounting on the 1:30 taper is controlled by clearance reduction or measured axial drive-up, never by locknut torque: SKF tables give the target radial-clearance decrease for the 420 mm 24084-ecak30-w33, checked with feeler gauges before and after drive-up.", "applications": [ "heavy rolling-mill work-roll chocks", "large dredger and marine winch drums", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder", "fan and pulley shafts that need periodic bearing removal in the field" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "smearing on the roller-raceway contact during skid starts below the minimum load" ], "pitfalls": [ "At 420 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24000-series series at 420 mm bore (620×200 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.", "Never apply the drive-up or clearance-reduction figures for this 1:30 tapered 24084-ecak30-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 200 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "Never use the tapered-bore CCK30/K30 variant's drive-up figures on this cylindrical-bore 24084-ecak30-w33; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 4610/8300 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 24084 ECAK30/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24084-ecak30-w33?", "a": "The SKF 24084 ECAK30/W33 is a double-row spherical roller bearing with a 1:30 tapered bore, 420 mm nominal bore, 620 mm outer diameter and 200 mm width (16.535 × 24.409 × 7.874 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 4610 kN, C0 8300 kN, Pu 585 kN, reference speed 530 r/min, limiting speed 900 r/min, mass about 230000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K30 suffix mean on 24084-ecak30-w33?", "a": "K30 (written CCK30/W33 in the CC execution) marks the 1:30 tapered bore for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder." }, { "q": "Which adapter sleeve fits the 24084-ecak30-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 420 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 24084-ecak30-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:30 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 24084-ecak30-w33 and 24084-ecak30-w33?", "a": "They share the ISO 15 envelope and the same 4610/8300 kN ratings, but 24084-ecak30-w33 has the 1:30 tapered bore for sleeve mounting on a plain shaft, while 24084-ecak30-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "24084", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) sleeve-mounted execution of 24084; identical ISO 15 envelope, fits AOH24084 withdrawal sleeve on a 400 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.3 withdrawal-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24084-ECAK30-W33", "SKF 24084 ECAK30/W33", "24084 K" ], "locale_variants": {} }, { "sku": "24184-ECAK30-W33", "brand": "SKF", "manufacturer_designation": "SKF 24184 ECAK30/W33", "series": "24100-series", "type": "spherical_roller", "d_mm": 420, "D_mm": 700, "B_mm": 280, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass_machined_M1", "dynamic_load_kN": 7577, "static_load_kN": 12500, "fatigue_load_limit_kN": 850, "max_rpm": 480, "reference_speed_rpm": 320, "limiting_speed_rpm": 480, "weight_g": 470000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The SKF 24184 ECAK30/W33 is a 420×700×280 mm spherical roller bearing with a 1:30 tapered bore — SKF catalogue execution for sleeve mounting on a 420 mm plain shaft, retaining the double-row self-aligning barrel-roller design. The code breaks down as type digit 2 (double-row spherical roller), dimension series 41 (dimension series 41 (medium OD, maximum width)), and bore code 84 = 420 mm; dimensions 420×700×280 mm therefore match the ISO 15 envelope. The K30 in the designation marks the 1:30 tapered bore: SKF mounts it on an H-series adapter sleeve (with KM locknut and MB lock washer) on a plain commercial-grade shaft, or on an AH withdrawal sleeve where the bearing must abut a shaft shoulder. Selection arithmetic: the C0/C ratio is about 1.65 (static 12500 kN against dynamic 7577 kN), typical of a spherical roller sized for heavy combined loads, and the 850 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. After drive-up, re-check radial clearance and then swing the outer ring through its self-aligning range: the sphered raceway of the 24184-ecak30-w33 must still tilt ≈ 0.5–2.5° freely — a joint that binds after sleeve mounting signals excessive drive-up or a cocked sleeve.", "applications": [ "SAG and ball-mill drive shafts", "large mining crusher main shafts", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "hard-particle indentation of the raceway in unfiltered oil or contaminated grease systems" ], "pitfalls": [ "At 420 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24100-series series at 420 mm bore (700×280 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 480 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.", "The adapter sleeve is selected by actual shaft diameter, not by the 420 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 24184-ecak30-w33 with different sleeves.", "Never apply the drive-up or clearance-reduction figures for this 1:30 tapered 24184-ecak30-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 24184-ecak30-w33 pits long before its L10 life.", "The 7577/12500 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 24184 ECAK30/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24184-ecak30-w33?", "a": "The SKF 24184 ECAK30/W33 is a double-row spherical roller bearing with a 1:30 tapered bore, 420 mm nominal bore, 700 mm outer diameter and 280 mm width (16.535 × 27.559 × 11.024 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 7577 kN, C0 12500 kN, Pu 850 kN, reference speed 320 r/min, limiting speed 480 r/min, mass about 470000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K30 suffix mean on 24184-ecak30-w33?", "a": "K30 (written CCK30/W33 in the CC execution) marks the 1:30 tapered bore for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder." }, { "q": "Which adapter sleeve fits the 24184-ecak30-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 420 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 24184-ecak30-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:30 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 24184-ecak30-w33 and 24184-ecak30-w33?", "a": "They share the ISO 15 envelope and the same 7577/12500 kN ratings, but 24184-ecak30-w33 has the 1:30 tapered bore for sleeve mounting on a plain shaft, while 24184-ecak30-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "24184", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) sleeve-mounted execution of 24184; identical ISO 15 envelope, fits AOH24184 withdrawal sleeve on a 400 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.3 withdrawal-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24184-ECAK30-W33", "SKF 24184 ECAK30/W33", "24184 K" ], "locale_variants": {} }, { "sku": "24088-ECAK30-W33", "brand": "SKF", "manufacturer_designation": "SKF 24088 ECAK30/W33", "series": "24000-series", "type": "spherical_roller", "d_mm": 440, "D_mm": 650, "B_mm": 212, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass_machined_M1", "dynamic_load_kN": 4987, "static_load_kN": 9150, "fatigue_load_limit_kN": 630, "max_rpm": 850, "reference_speed_rpm": 500, "limiting_speed_rpm": 850, "weight_g": 275000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For sleeve mounting on a 440 mm shaft, SKF order number SKF 24088 ECAK30/W33 is the 1:30 tapered-bore spherical roller bearing in the 24000-series family (dimension series 40 (compact OD, maximum width)); the cylindrical-bore equivalent is a separate order number, 24088-ecak30-w33. On the SKF nameplate, 24088-ecak30-w33 follows the ISO 15 convention: 2 for the spherical roller type, 40 for the dimension series 40 (compact OD, maximum width), final digits 88 for the 440 mm bore. Sleeve mounting is why the K30 execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. The 630 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.83 C0/C balance shows this execution is tuned to heavy radial-plus-axial duty with misalignment tolerance. Mounting on the 1:30 taper is controlled by clearance reduction or measured axial drive-up, never by locknut torque: SKF tables give the target radial-clearance decrease for the 440 mm 24088-ecak30-w33, checked with feeler gauges before and after drive-up.", "applications": [ "steel-plant continuous-caster segments", "large induced-draft fan rotors", "fan and pulley shafts that need periodic bearing removal in the field", "shafting produced to commercial tolerances, where the adapter sleeve supplies the precision seat" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "At 440 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24000-series series at 440 mm bore (650×212 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.", "The adapter sleeve is selected by actual shaft diameter, not by the 440 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 24088-ecak30-w33 with different sleeves.", "The 24088-ecak30-w33 and its cylindrical-bore counterpart 24088-ecak30-w33 share envelope and load ratings (4987/9150 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "Never use the tapered-bore CCK30/K30 variant's drive-up figures on this cylindrical-bore 24088-ecak30-w33; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 4987/9150 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 24088 ECAK30/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24088-ecak30-w33?", "a": "The SKF 24088 ECAK30/W33 is a double-row spherical roller bearing with a 1:30 tapered bore, 440 mm nominal bore, 650 mm outer diameter and 212 mm width (17.323 × 25.591 × 8.346 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 4987 kN, C0 9150 kN, Pu 630 kN, reference speed 500 r/min, limiting speed 850 r/min, mass about 275000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K30 suffix mean on 24088-ecak30-w33?", "a": "K30 (written CCK30/W33 in the CC execution) marks the 1:30 tapered bore for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder." }, { "q": "Which adapter sleeve fits the 24088-ecak30-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 440 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 24088-ecak30-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:30 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 24088-ecak30-w33 and 24088-ecak30-w33?", "a": "They share the ISO 15 envelope and the same 4987/9150 kN ratings, but 24088-ecak30-w33 has the 1:30 tapered bore for sleeve mounting on a plain shaft, while 24088-ecak30-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "24088", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) sleeve-mounted execution of 24088; identical ISO 15 envelope, fits AOH24088 withdrawal sleeve on a 420 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.3 withdrawal-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24088-ECAK30-W33", "SKF 24088 ECAK30/W33", "24088 K" ], "locale_variants": {} }, { "sku": "24188-ECAK30-W33", "brand": "SKF", "manufacturer_designation": "SKF 24188 ECAK30/W33", "series": "24100-series", "type": "spherical_roller", "d_mm": 440, "D_mm": 720, "B_mm": 280, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass_machined_M1", "dynamic_load_kN": 7777, "static_load_kN": 13200, "fatigue_load_limit_kN": 900, "max_rpm": 450, "reference_speed_rpm": 300, "limiting_speed_rpm": 450, "weight_g": 490000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "The SKF 24188 ECAK30/W33 is a 440×720×280 mm spherical roller bearing with a 1:30 tapered bore — SKF catalogue execution for sleeve mounting on a 440 mm plain shaft, retaining the double-row self-aligning barrel-roller design. The code breaks down as type digit 2 (double-row spherical roller), dimension series 41 (dimension series 41 (medium OD, maximum width)), and bore code 88 = 440 mm; dimensions 440×720×280 mm therefore match the ISO 15 envelope. Reading the suffix on 24188-ecak30-w33, the K30 (or EK/CCK30) element changes only the bore — 1:30 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 24188-ecak30-w33. The 140.0 mm radial section height ((720−440)/2) and 490000 g catalogue mass frame a 440 mm bore bearing rated at 7777 kN C — roughly 17.68 kN of dynamic capacity per millimetre of bore before application factors. After drive-up, re-check radial clearance and then swing the outer ring through its self-aligning range: the sphered raceway of the 24188-ecak30-w33 must still tilt ≈ 0.5–2.5° freely — a joint that binds after sleeve mounting signals excessive drive-up or a cocked sleeve.", "applications": [ "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder", "fan and pulley shafts that need periodic bearing removal in the field" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "smearing on the roller-raceway contact during skid starts below the minimum load" ], "pitfalls": [ "At 440 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24100-series series at 440 mm bore (720×280 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 450 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 280 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "The adapter sleeve is selected by actual shaft diameter, not by the 440 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 24188-ecak30-w33 with different sleeves.", "Open spherical roller bearings rely on the housing seals; in screening or crusher duty a failed seal lets grit into the sphered raceway and the 24188-ecak30-w33 pits long before its L10 life.", "The 7777/13200 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 24188 ECAK30/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24188-ecak30-w33?", "a": "The SKF 24188 ECAK30/W33 is a double-row spherical roller bearing with a 1:30 tapered bore, 440 mm nominal bore, 720 mm outer diameter and 280 mm width (17.323 × 28.346 × 11.024 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 7777 kN, C0 13200 kN, Pu 900 kN, reference speed 300 r/min, limiting speed 450 r/min, mass about 490000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K30 suffix mean on 24188-ecak30-w33?", "a": "K30 (written CCK30/W33 in the CC execution) marks the 1:30 tapered bore for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder." }, { "q": "Which adapter sleeve fits the 24188-ecak30-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 440 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 24188-ecak30-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:30 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 24188-ecak30-w33 and 24188-ecak30-w33?", "a": "They share the ISO 15 envelope and the same 7777/13200 kN ratings, but 24188-ecak30-w33 has the 1:30 tapered bore for sleeve mounting on a plain shaft, while 24188-ecak30-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "24188", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) sleeve-mounted execution of 24188; identical ISO 15 envelope, fits AOH24188 withdrawal sleeve on a 420 mm shaft." }, { "equiv_sku": "C4188-MB", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 4188 MB shares the 440×720×280 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C4188-K30MB", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 4188 K30MB shares the 440×720×280 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.3 withdrawal-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24188-ECAK30-W33", "SKF 24188 ECAK30/W33", "24188 K" ], "locale_variants": {} }, { "sku": "24092-ECAK30-W33", "brand": "SKF", "manufacturer_designation": "SKF 24092 ECAK30/W33", "series": "24000-series", "type": "spherical_roller", "d_mm": 460, "D_mm": 680, "B_mm": 218, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass_machined_M1", "dynamic_load_kN": 5401, "static_load_kN": 10000, "fatigue_load_limit_kN": 670, "max_rpm": 800, "reference_speed_rpm": 480, "limiting_speed_rpm": 800, "weight_g": 300000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 24092-ecak30-w33 denotes the tapered-bore version (K30 suffix, taper 1:30) of the 24000-series spherical roller bearing: dimensioned 460×680×218 mm, it seats on an adapter or withdrawal sleeve rather than directly on a machined journal. The code breaks down as type digit 2 (double-row spherical roller), dimension series 40 (dimension series 40 (compact OD, maximum width)), and bore code 92 = 460 mm; dimensions 460×680×218 mm therefore match the ISO 15 envelope. Reading the suffix on 24092-ecak30-w33, the K30 (or EK/CCK30) element changes only the bore — 1:30 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 24092-ecak30-w33. The 110.0 mm radial section height ((680−460)/2) and 300000 g catalogue mass frame a 460 mm bore bearing rated at 5401 kN C — roughly 11.74 kN of dynamic capacity per millimetre of bore before application factors. On an H adapter sleeve the 460 mm shaft seat only needs an h9 plain journal; slide the sleeve into the 24092-ecak30-w33 inner ring, tighten the KM nut against the MB washer until the catalogue clearance-reduction value is reached, then lock the washer tab.", "applications": [ "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "smearing on the roller-raceway contact during skid starts below the minimum load" ], "pitfalls": [ "At 460 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24000-series series at 460 mm bore (680×218 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.", "The 24092-ecak30-w33 and its cylindrical-bore counterpart 24092-ecak30-w33 share envelope and load ratings (5401/10000 kN) but are not interchangeable in a housing already fitted for direct shaft mounting — the sleeve changes the assembly stack-up.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 218 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "Never use the tapered-bore CCK30/K30 variant's drive-up figures on this cylindrical-bore 24092-ecak30-w33; clearance reduction targets differ, and over-driving a cylindrical bore onto an oversized journal cracks the inner ring.", "The 5401/10000 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 24092 ECAK30/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24092-ecak30-w33?", "a": "The SKF 24092 ECAK30/W33 is a double-row spherical roller bearing with a 1:30 tapered bore, 460 mm nominal bore, 680 mm outer diameter and 218 mm width (18.11 × 26.772 × 8.583 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 5401 kN, C0 10000 kN, Pu 670 kN, reference speed 480 r/min, limiting speed 800 r/min, mass about 300000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K30 suffix mean on 24092-ecak30-w33?", "a": "K30 (written CCK30/W33 in the CC execution) marks the 1:30 tapered bore for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder." }, { "q": "Which adapter sleeve fits the 24092-ecak30-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 460 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 24092-ecak30-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:30 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 24092-ecak30-w33 and 24092-ecak30-w33?", "a": "They share the ISO 15 envelope and the same 5401/10000 kN ratings, but 24092-ecak30-w33 has the 1:30 tapered bore for sleeve mounting on a plain shaft, while 24092-ecak30-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "24092", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) sleeve-mounted execution of 24092; identical ISO 15 envelope, fits AOH24092 withdrawal sleeve on a 440 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.3 withdrawal-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24092-ECAK30-W33", "SKF 24092 ECAK30/W33", "24092 K" ], "locale_variants": {} }, { "sku": "24192-ECAK30-W33", "brand": "SKF", "manufacturer_designation": "SKF 24192 ECAK30/W33", "series": "24100-series", "type": "spherical_roller", "d_mm": 460, "D_mm": 760, "B_mm": 300, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass_machined_M1", "dynamic_load_kN": 8608, "static_load_kN": 14600, "fatigue_load_limit_kN": 1000, "max_rpm": 430, "reference_speed_rpm": 280, "limiting_speed_rpm": 430, "weight_g": 590000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF 24192 ECAK30/W33 in SKF catalogue PUB BU/P1 17000 is a double-row spherical roller bearing with a tapered bore (1:30), intended for an H-series adapter sleeve or AH withdrawal sleeve, with a one-piece machined brass cage guided on the inner ring (CA design) and the same 460×760×300 mm ISO 15 outline as its cylindrical-bore counterpart. Reading the designation: the leading 2 marks a spherical roller bearing, the 41 is the ISO 15 dimension series (dimension series 41 (medium OD, maximum width)), and the last two digits encode the 460 mm bore; the 760 mm OD and 300 mm width follow the ISO 15 general plan. Reading the suffix on 24192-ecak30-w33, the K30 (or EK/CCK30) element changes only the bore — 1:30 taper for sleeve mounting — while the rest of the suffix chain (CC cages with W33 groove) keeps the same internal design, cage and W33 relubrication features as the cylindrical-bore 24192-ecak30-w33. Selection arithmetic: the C0/C ratio is about 1.70 (static 14600 kN against dynamic 8608 kN), typical of a spherical roller sized for heavy combined loads, and the 1000 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation. Mounting on the 1:30 taper is controlled by clearance reduction or measured axial drive-up, never by locknut torque: SKF tables give the target radial-clearance decrease for the 460 mm 24192-ecak30-w33, checked with feeler gauges before and after drive-up.", "applications": [ "SAG and ball-mill drive shafts", "large mining crusher main shafts", "heavy crusher and screen shafts mounted and dismounted with hydraulic nuts", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "sleeve seizure and shaft seat damage from omitting the anti-seize film between withdrawal sleeve and journal before drive-up", "surface distress and smearing when the relubrication interval is exceeded — the W33 groove is only effective if grease actually reaches the roller rows", "smearing on the roller-raceway contact during skid starts below the minimum load" ], "pitfalls": [ "At 460 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24100-series series at 460 mm bore (760×300 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 430 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.", "Never apply the drive-up or clearance-reduction figures for this 1:30 tapered 24192-ecak30-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "The adapter sleeve is selected by actual shaft diameter, not by the 460 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 24192-ecak30-w33 with different sleeves.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 8608/14600 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 24192 ECAK30/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24192-ecak30-w33?", "a": "The SKF 24192 ECAK30/W33 is a double-row spherical roller bearing with a 1:30 tapered bore, 460 mm nominal bore, 760 mm outer diameter and 300 mm width (18.11 × 29.921 × 11.811 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 8608 kN, C0 14600 kN, Pu 1000 kN, reference speed 280 r/min, limiting speed 430 r/min, mass about 590000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K30 suffix mean on 24192-ecak30-w33?", "a": "K30 (written CCK30/W33 in the CC execution) marks the 1:30 tapered bore for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder." }, { "q": "Which adapter sleeve fits the 24192-ecak30-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 460 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 24192-ecak30-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:30 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 24192-ecak30-w33 and 24192-ecak30-w33?", "a": "They share the ISO 15 envelope and the same 8608/14600 kN ratings, but 24192-ecak30-w33 has the 1:30 tapered bore for sleeve mounting on a plain shaft, while 24192-ecak30-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "24192", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) sleeve-mounted execution of 24192; identical ISO 15 envelope, fits AOH24192 withdrawal sleeve on a 440 mm shaft." }, { "equiv_sku": "C4192-MB", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 4192 MB shares the 460×760×300 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." }, { "equiv_sku": "C4192-K30MB", "equiv_brand": "SKF", "level": "full", "note": "SKF CARB toroidal bearing C 4192 K30MB shares the 460×760×300 mm envelope with ratings within 10 %; it self-aligns but floats axially and cannot locate the shaft — locating/non-locating pair, not a substitute." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.3 withdrawal-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24192-ECAK30-W33", "SKF 24192 ECAK30/W33", "24192 K" ], "locale_variants": {} }, { "sku": "24096-ECAK30-W33", "brand": "SKF", "manufacturer_designation": "SKF 24096 ECAK30/W33", "series": "24000-series", "type": "spherical_roller", "d_mm": 480, "D_mm": 700, "B_mm": 218, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass_machined_M1", "dynamic_load_kN": 5524, "static_load_kN": 10400, "fatigue_load_limit_kN": 695, "max_rpm": 750, "reference_speed_rpm": 450, "limiting_speed_rpm": 750, "weight_g": 310000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, 24096-ecak30-w33 denotes the tapered-bore version (K30 suffix, taper 1:30) of the 24000-series spherical roller bearing: dimensioned 480×700×218 mm, it seats on an adapter or withdrawal sleeve rather than directly on a machined journal. Digit by digit, 24096-ecak30-w33 reads as bearing type 2 (spherical roller, two barrel-roller rows), dimension series 40, and bore reference 96 resolving to 480 mm; 700 mm OD and 218 mm width are the matching ISO 15 boundary values. Note that K30 means the 1:30 taper used on dimension series 40/41; the more common K means 1:12. Adapter sleeves (H) and withdrawal sleeves (AH) are ordered separately by shaft diameter, and the KM locknut plus MB lock washer used for drive-up are also separate components. At 450 r/min reference speed the 110.0 mm-section 24096-ecak30-w33 is governed thermally by lubricant flow through the W33 groove and the two-row roller complement; grease or oil selection should be made against that value, with 750 r/min as the mechanical ceiling. Over-driving the 24096-ecak30-w33 up its sleeve pinches radial clearance below the residual minimum and can crack the inner ring in service; under-driving leaves the sleeve seat loose, so the ring creeps and frets the sleeve — measure, do not estimate.", "applications": [ "large induced-draft fan rotors", "SAG and ball-mill drive shafts", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder", "fan and pulley shafts that need periodic bearing removal in the field" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "inner-ring circumferential cracking after over-drive on the tapered seat removes too much radial clearance and the bearing runs preloaded", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "seal-lip wear and grease purge loss when an open bearing is run without functioning housing seals" ], "pitfalls": [ "At 480 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24000-series series at 480 mm bore (700×218 mm) packs maximum roller length into the smallest OD envelope — very high C0 for its size but the lowest speed ceiling; never swap it for a wider-OD 231 bearing without re-checking the housing bore and the speed margin.", "The adapter sleeve is selected by actual shaft diameter, not by the 480 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 24096-ecak30-w33 with different sleeves.", "Never apply the drive-up or clearance-reduction figures for this 1:30 tapered 24096-ecak30-w33 to a bearing of the other taper (1:12 vs 1:30); the steeper taper moves far less clearance per nut turn and the targets come from different catalogue tables.", "Shaft and housing fillets must clear the bearing chamfer so the 218 mm-wide rings seat square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.", "The 5524/10400 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 24096 ECAK30/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24096-ecak30-w33?", "a": "The SKF 24096 ECAK30/W33 is a double-row spherical roller bearing with a 1:30 tapered bore, 480 mm nominal bore, 700 mm outer diameter and 218 mm width (18.898 × 27.559 × 8.583 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 5524 kN, C0 10400 kN, Pu 695 kN, reference speed 450 r/min, limiting speed 750 r/min, mass about 310000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K30 suffix mean on 24096-ecak30-w33?", "a": "K30 (written CCK30/W33 in the CC execution) marks the 1:30 tapered bore for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder." }, { "q": "Which adapter sleeve fits the 24096-ecak30-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 480 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 24096-ecak30-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:30 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 24096-ecak30-w33 and 24096-ecak30-w33?", "a": "They share the ISO 15 envelope and the same 5524/10400 kN ratings, but 24096-ecak30-w33 has the 1:30 tapered bore for sleeve mounting on a plain shaft, while 24096-ecak30-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "24096", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) sleeve-mounted execution of 24096; identical ISO 15 envelope, fits AOH24096 withdrawal sleeve on a 460 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.3 withdrawal-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24096-ECAK30-W33", "SKF 24096 ECAK30/W33", "24096 K" ], "locale_variants": {} }, { "sku": "24196-ECAK30-W33", "brand": "SKF", "manufacturer_designation": "SKF 24196 ECAK30/W33", "series": "24100-series", "type": "spherical_roller", "d_mm": 480, "D_mm": 790, "B_mm": 308, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass_machined_M1", "dynamic_load_kN": 9198, "static_load_kN": 15600, "fatigue_load_limit_kN": 1040, "max_rpm": 400, "reference_speed_rpm": 260, "limiting_speed_rpm": 400, "weight_g": 635000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF 24196 ECAK30/W33 in SKF catalogue PUB BU/P1 17000 is a double-row spherical roller bearing with a tapered bore (1:30), intended for an H-series adapter sleeve or AH withdrawal sleeve, with a one-piece machined brass cage guided on the inner ring (CA design) and the same 480×790×308 mm ISO 15 outline as its cylindrical-bore counterpart. Reading the designation: the leading 2 marks a spherical roller bearing, the 41 is the ISO 15 dimension series (dimension series 41 (medium OD, maximum width)), and the last two digits encode the 480 mm bore; the 790 mm OD and 308 mm width follow the ISO 15 general plan. Sleeve mounting is why the K30 execution exists: a plain h9-tolerance shaft is enough because the adapter sleeve supplies the precision seat, and the bearing is removable without pulling over an interference journal — a separate order number from the cylindrical-bore bearing, never a field conversion. The 155.0 mm radial section height ((790−480)/2) and 635000 g catalogue mass frame a 480 mm bore bearing rated at 9198 kN C — roughly 19.16 kN of dynamic capacity per millimetre of bore before application factors. Mounting on the 1:30 taper is controlled by clearance reduction or measured axial drive-up, never by locknut torque: SKF tables give the target radial-clearance decrease for the 480 mm 24196-ecak30-w33, checked with feeler gauges before and after drive-up.", "applications": [ "wind-turbine main shaft support", "heavy rolling-mill work-roll chocks", "long through-shafts in conveyors, where a sleeve seat avoids a precision journal", "stepped shafts fitted with withdrawal sleeves against a fixed shoulder" ], "failure_modes": [ "raceway fatigue spalling of the sphered outer raceway after extended service above the catalogue L10 rating", "inner-ring raceway spalling from edge loading when misalignment exceeds the self-aligning recovery range", "fretting corrosion and sleeve-seat scoring when drive-up is insufficient and the tapered inner ring creeps on the adapter sleeve", "roller-end scoring from starved lubricant at start-up before the grease channel purges", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "At 480 mm bore the ring mass makes cocking during mounting a real risk; guide the bearing square, confirm seat contact around the full circumference, and re-check the self-aligning swing after the housing cap is torqued down.", "The 24100-series series at 480 mm bore (790×308 mm) is the heaviest medium-OD execution, built for extreme radial and shock loads at low speed; the 400 r/min ceiling is part of the design, not an afterthought — check it before using it in a faster drive.", "The adapter sleeve is selected by actual shaft diameter, not by the 480 mm nominal bearing bore: H-sleeve part numbers span a small diameter range, so two different shaft diameters can use the same 24196-ecak30-w33 with different sleeves.", "A loose sleeve after the first weeks of service usually means inadequate initial drive-up; re-checking clearance without dismounting is possible through the 308 mm-wide roller rows with feeler gauges — do not simply tighten the KM nut until vibration stops.", "The self-aligning feature is not a license to ignore alignment: beyond ≈ 0.5–2.5° (series-dependent) the edge loading eats the fatigue margin, and seal drag grows as the rings tilt.", "The 9198/15600 kN ratings are SKF catalogue values for this tapered-bore execution (SKF 24196 ECAK30/W33); sleeve, KM nut and MB washer are separate order numbers, and the catalogue version (SKF catalogue PUB BU/P1 17000) should travel with the mounting specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 24196-ecak30-w33?", "a": "The SKF 24196 ECAK30/W33 is a double-row spherical roller bearing with a 1:30 tapered bore, 480 mm nominal bore, 790 mm outer diameter and 308 mm width (18.898 × 31.102 × 12.126 in) per ISO 15. From SKF catalogue PUB BU/P1 17000: C 9198 kN, C0 15600 kN, Pu 1040 kN, reference speed 260 r/min, limiting speed 400 r/min, mass about 635000 g. It is mounted on an adapter (H) or withdrawal (AH) sleeve, not directly on the shaft." }, { "q": "What does the K30 suffix mean on 24196-ecak30-w33?", "a": "K30 (written CCK30/W33 in the CC execution) marks the 1:30 tapered bore for sleeve mounting. The bearing seats on an H-series adapter sleeve with a KM locknut and MB lock washer (plain shaft, h9 tolerance), or on an AH withdrawal sleeve against a shaft shoulder." }, { "q": "Which adapter sleeve fits the 24196-ecak30-w33?", "a": "The sleeve is selected by the actual shaft diameter in millimetres, not only by the 480 mm nominal bore: SKF H-sleeve numbers each cover a small shaft-diameter range and are width-series specific (H39/H30/H31/H32 matching dimension series 39/40/31/32), and each kit bundles the sleeve, KM locknut and MB lock washer. For shoulder locations use an AH withdrawal sleeve instead. Confirm the sleeve number against the SKF catalogue PUB BU/P1 17000 mounting tables for your shaft size." }, { "q": "How is the 24196-ecak30-w33 driven up and checked?", "a": "Mounting is controlled by radial-clearance reduction or axial drive-up distance from the SKF catalogue tables for the 1:30 taper, never by locknut torque. Measure clearance with feeler gauges before and after tightening the KM nut, stop at the tabulated decrease, and lock the MB washer tab. Over-drive removes too much clearance (inner-ring cracking risk); under-drive lets the sleeve creep and fret." }, { "q": "What is the difference between 24196-ecak30-w33 and 24196-ecak30-w33?", "a": "They share the ISO 15 envelope and the same 9198/15600 kN ratings, but 24196-ecak30-w33 has the 1:30 tapered bore for sleeve mounting on a plain shaft, while 24196-ecak30-w33 has a cylindrical bore for direct mounting on a machined interference journal (typically m6 with H7 housing). They are separate order numbers, not interchangeable in the same shaft arrangement." } ], "cross_ref": [ { "equiv_sku": "24196", "equiv_brand": "SKF", "level": "full", "note": "Tapered-bore (1:30) sleeve-mounted execution of 24196; identical ISO 15 envelope, fits AOH24196 withdrawal sleeve on a 460 mm shaft." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/spherical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 9.3 withdrawal-sleeve executions", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "24196-ECAK30-W33", "SKF 24196 ECAK30/W33", "24196 K" ], "locale_variants": {} }, { "sku": "319426-B-2LS", "brand": "SKF", "manufacturer_designation": "SKF 319426 B-2LS", "series": "NNF4900-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 190, "B_mm": 80, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 446, "static_load_kN": 815, "fatigue_load_limit_kN": 91.5, "max_rpm": 670, "reference_speed_rpm": 670, "limiting_speed_rpm": 670, "weight_g": 7300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 130 mm shaft, SKF lists 319426-B-2LS as sealed double-row full-complement cylindrical roller: 190 mm OD, 80 mm wide, Pu 91.5 kN, with a sealed limiting speed of 670 r/min. The NNF configuration means a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed; functionally the bearing is a sealed locating unit for very heavy radial loads; the sealed-for-life execution is the classic crane-sheave bearing. The B-2LS suffix denotes nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. The six-digit order number is SKF's earlier designation convention retained for this 49-series envelope; it is still the factory order number rather than an NNF-series code. Selection arithmetic: C0/C ≈ 1.83 (815 against 446 kN), and the Pu figure 91.5 kN is the fatigue load-limit floor for the SKF life equation; SKF publishes only a limiting speed of 670 r/min for this sealed execution — the seal contact and packed grease, not a thermal reference speed, set the ceiling. Mounting: mount as a complete sealed unit — never wash out the factory grease; the seals set the speed ceiling, and relubrication, where specified, goes through the ring grooves. A 130 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "large offshore hook blocks and jib sheaves", "heavy dock and shipyard crane systems", "mining dragline and shovel rope sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "seal-lip wear and grease loss in dusty crane and construction service after the relubrication interval is exceeded", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "grease degradation inside the sealed unit after long high-temperature periods, invisible until noise rises", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "The sealed NNF unit is packed for life with the correct grease — do not heat it above the seal limit or wash it before mounting; damaged lip seals invalidate the heavy-load duty.", "The B1 width (79 mm inner-assembly width) differs from the overall B 80 mm; check housing and spacer geometry against both values.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 190 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 80 mm-wide ring and concentrates load.", "The 446/815 kN ratings are SKF catalogue 17000 (2018) values for the B-2LS execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 319426-B-2LS?", "a": "SKF 319426 B-2LS is a sealed double-row full-complement cylindrical roller bearing with 130 mm bore, 190 mm OD and 80 mm width per ISO 15. SKF lists C 446 kN, C0 815 kN, Pu 91.5 kN, limiting speed 670 r/min (sealed execution), mass about 7300 g. Inner-assembly width B1 is 79 mm." }, { "q": "What does the NNF designation and B-2LS suffix mean?", "a": "The B-2LS suffix denotes nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. Structurally this execution has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed." }, { "q": "Can 319426-B-2LS take axial load and locate the shaft?", "a": "The sealed NNF unit can guide light axial loads in both directions via the flanged inner ring, but its primary duty is very heavy radial load in sealed positions." }, { "q": "How does 319426-B-2LS compare with the other executions in the same envelope?", "a": "The sealed NNF execution shares its envelope with the open NNCF/NNCL/NNC full-complement bearings but is delivered grease-packed with contact seals and a much lower speed ceiling." }, { "q": "Does the sealed NNF bearing need relubrication?", "a": "NNF bearings are delivered grease-packed and sealed for long service; where the design provides relubrication grooves/holes, replenish through them at the prescribed interval. Never wash the bearing out or exceed the seal-limited speed." } ], "cross_ref": [ { "equiv_sku": "319426", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.5 sealed double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "319426-B-2LS", "SKF 319426 B-2LS" ], "locale_variants": {} }, { "sku": "319428-DA-2LS", "brand": "SKF", "manufacturer_designation": "SKF 319428 DA-2LS", "series": "NNF4900-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 200, "B_mm": 80, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 468, "static_load_kN": 865, "fatigue_load_limit_kN": 96.5, "max_rpm": 630, "reference_speed_rpm": 630, "limiting_speed_rpm": 630, "weight_g": 8000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF 319428 DA-2LS resolves to a 140×200×80 mm sealed double-row full-complement cylindrical roller bearing (dimension series 3194); a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed. Structurally, the NNF design has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed. In arrangement terms it is a sealed locating unit for very heavy radial loads; the sealed-for-life execution is the classic crane-sheave bearing. The DA-2LS suffix marks the contact-sealed both-side execution in the DA ring configuration; it is a sealed, grease-packed unit. The six-digit order number is SKF's earlier designation convention retained for this 49-series envelope; it is still the factory order number rather than an NNF-series code. With C 468 kN and C0 865 kN, size the bearing on the 140×200 mm ISO 15 envelope and check the 96.5 kN Pu against the equivalent-load floor; SKF publishes only a limiting speed of 630 r/min for this sealed execution — the seal contact and packed grease, not a thermal reference speed, set the ceiling. Fit practice for 319428-DA-2LS: mount as a complete sealed unit — never wash out the factory grease; the seals set the speed ceiling, and relubrication, where specified, goes through the ring grooves. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "mining dragline and shovel rope sheaves", "large offshore hook blocks and jib sheaves", "heavy dock and shipyard crane systems" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "seal-lip wear and grease loss in dusty crane and construction service after the relubrication interval is exceeded", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "grease degradation inside the sealed unit after long high-temperature periods, invisible until noise rises", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "The sealed NNF unit is packed for life with the correct grease — do not heat it above the seal limit or wash it before mounting; damaged lip seals invalidate the heavy-load duty.", "The B1 width (79 mm inner-assembly width) differs from the overall B 80 mm; check housing and spacer geometry against both values.", "Catalogue reference and limiting speeds are different criteria, though only the limiting speed is published for this sealed unit: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 80 mm-wide ring and concentrates load.", "The 468/865 kN ratings are SKF catalogue 17000 (2018) values for the DA-2LS execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 319428-DA-2LS?", "a": "SKF 319428 DA-2LS is a sealed double-row full-complement cylindrical roller bearing with 140 mm bore, 200 mm OD and 80 mm width per ISO 15. SKF lists C 468 kN, C0 865 kN, Pu 96.5 kN, limiting speed 630 r/min (sealed execution), mass about 8000 g. Inner-assembly width B1 is 79 mm." }, { "q": "What does the NNF designation and DA-2LS suffix mean?", "a": "The DA-2LS suffix marks the contact-sealed both-side execution in the DA ring configuration; it is a sealed, grease-packed unit. Structurally this execution has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed." }, { "q": "Can 319428-DA-2LS take axial load and locate the shaft?", "a": "The sealed NNF unit can guide light axial loads in both directions via the flanged inner ring, but its primary duty is very heavy radial load in sealed positions." }, { "q": "How does 319428-DA-2LS compare with the other executions in the same envelope?", "a": "The sealed NNF execution shares its envelope with the open NNCF/NNCL/NNC full-complement bearings but is delivered grease-packed with contact seals and a much lower speed ceiling." }, { "q": "Does the sealed NNF bearing need relubrication?", "a": "NNF bearings are delivered grease-packed and sealed for long service; where the design provides relubrication grooves/holes, replenish through them at the prescribed interval. Never wash the bearing out or exceed the seal-limited speed." } ], "cross_ref": [ { "equiv_sku": "319428", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.5 sealed double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "319428-DA-2LS", "SKF 319428 DA-2LS" ], "locale_variants": {} }, { "sku": "319430-B-2LS", "brand": "SKF", "manufacturer_designation": "SKF 319430 B-2LS", "series": "NNF4900-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 210, "B_mm": 80, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 484, "static_load_kN": 915, "fatigue_load_limit_kN": 100, "max_rpm": 600, "reference_speed_rpm": 600, "limiting_speed_rpm": 600, "weight_g": 8400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF 319430 B-2LS is a sealed double-row full-complement cylindrical roller bearing sized 150×210×80 mm — a dimension series 3194, listed in SKF catalogue PUB BU/P1 17000 ch. 6.5. Structurally, the NNF design has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed. In arrangement terms it is a sealed locating unit for very heavy radial loads; the sealed-for-life execution is the classic crane-sheave bearing. The B-2LS suffix denotes nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. The six-digit order number is SKF's earlier designation convention retained for this 49-series envelope; it is still the factory order number rather than an NNF-series code. Load-per-bore for the 150 mm seat is about 3.23 kN/mm, typical of dimension series 3194; use C0 915 kN for static checks such as crane hook blocks standing under load. Assembly note: mount as a complete sealed unit — never wash out the factory grease; the seals set the speed ceiling, and relubrication, where specified, goes through the ring grooves. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "large offshore hook blocks and jib sheaves", "heavy dock and shipyard crane systems", "mining dragline and shovel rope sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "seal-lip wear and grease loss in dusty crane and construction service after the relubrication interval is exceeded", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "grease degradation inside the sealed unit after long high-temperature periods, invisible until noise rises", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "The sealed NNF unit is packed for life with the correct grease — do not heat it above the seal limit or wash it before mounting; damaged lip seals invalidate the heavy-load duty.", "The B1 width (79 mm inner-assembly width) differs from the overall B 80 mm; check housing and spacer geometry against both values.", "Catalogue reference and limiting speeds are different criteria, though only the limiting speed is published for this sealed unit: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 210 mm raceway.", "The 484/915 kN ratings are SKF catalogue 17000 (2018) values for the B-2LS execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 319430-B-2LS?", "a": "SKF 319430 B-2LS is a sealed double-row full-complement cylindrical roller bearing with 150 mm bore, 210 mm OD and 80 mm width per ISO 15. SKF lists C 484 kN, C0 915 kN, Pu 100 kN, limiting speed 600 r/min (sealed execution), mass about 8400 g. Inner-assembly width B1 is 79 mm." }, { "q": "What does the NNF designation and B-2LS suffix mean?", "a": "The B-2LS suffix denotes nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. Structurally this execution has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed." }, { "q": "Can 319430-B-2LS take axial load and locate the shaft?", "a": "The sealed NNF unit can guide light axial loads in both directions via the flanged inner ring, but its primary duty is very heavy radial load in sealed positions." }, { "q": "How does 319430-B-2LS compare with the other executions in the same envelope?", "a": "The sealed NNF execution shares its envelope with the open NNCF/NNCL/NNC full-complement bearings but is delivered grease-packed with contact seals and a much lower speed ceiling." }, { "q": "Does the sealed NNF bearing need relubrication?", "a": "NNF bearings are delivered grease-packed and sealed for long service; where the design provides relubrication grooves/holes, replenish through them at the prescribed interval. Never wash the bearing out or exceed the seal-limited speed." } ], "cross_ref": [ { "equiv_sku": "319430", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.5 sealed double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "319430-B-2LS", "SKF 319430 B-2LS" ], "locale_variants": {} }, { "sku": "319432-DA-2LS", "brand": "SKF", "manufacturer_designation": "SKF 319432 DA-2LS", "series": "NNF4900-series", "type": "cylindrical_roller", "d_mm": 160, "D_mm": 220, "B_mm": 80, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 501, "static_load_kN": 1000, "fatigue_load_limit_kN": 106, "max_rpm": 530, "reference_speed_rpm": 530, "limiting_speed_rpm": 530, "weight_g": 8800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF 319432 DA-2LS is a sealed double-row full-complement cylindrical roller bearing sized 160×220×80 mm — a dimension series 3194, listed in SKF catalogue PUB BU/P1 17000 ch. 6.5. Reading the NNF prefix: a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed. This makes the execution a sealed locating unit for very heavy radial loads; the sealed-for-life execution is the classic crane-sheave bearing. The six-digit order number is SKF's earlier designation convention retained for this 49-series envelope; it is still the factory order number rather than an NNF-series code. Reading the order-string suffix DA-2LS: contact seals on both sides in the DA ring configuration, delivered grease-packed. Selection arithmetic: C0/C ≈ 2.00 (1000 against 501 kN), and the Pu figure 106 kN is the fatigue load-limit floor for the SKF life equation; SKF publishes only a limiting speed of 530 r/min for this sealed execution — the seal contact and packed grease, not a thermal reference speed, set the ceiling. Mounting: mount as a complete sealed unit — never wash out the factory grease; the seals set the speed ceiling, and relubrication, where specified, goes through the ring grooves. A 160 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "large offshore hook blocks and jib sheaves", "heavy dock and shipyard crane systems", "mining dragline and shovel rope sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "seal-lip wear and grease loss in dusty crane and construction service after the relubrication interval is exceeded", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "grease degradation inside the sealed unit after long high-temperature periods, invisible until noise rises", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "The sealed NNF unit is packed for life with the correct grease — do not heat it above the seal limit or wash it before mounting; damaged lip seals invalidate the heavy-load duty.", "The B1 width (79 mm inner-assembly width) differs from the overall B 80 mm; check housing and spacer geometry against both values.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 80 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria, though only the limiting speed is published for this sealed unit: observe the mechanical ceiling even when thermal calculations allow more.", "The 501/1000 kN ratings are SKF catalogue 17000 (2018) values for the DA-2LS execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 319432-DA-2LS?", "a": "SKF 319432 DA-2LS is a sealed double-row full-complement cylindrical roller bearing with 160 mm bore, 220 mm OD and 80 mm width per ISO 15. SKF lists C 501 kN, C0 1000 kN, Pu 106 kN, limiting speed 530 r/min (sealed execution), mass about 8800 g. Inner-assembly width B1 is 79 mm." }, { "q": "What does the NNF designation and DA-2LS suffix mean?", "a": "The DA-2LS suffix marks the contact-sealed both-side execution in the DA ring configuration; it is a sealed, grease-packed unit. Structurally this execution has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed." }, { "q": "Can 319432-DA-2LS take axial load and locate the shaft?", "a": "The sealed NNF unit can guide light axial loads in both directions via the flanged inner ring, but its primary duty is very heavy radial load in sealed positions." }, { "q": "How does 319432-DA-2LS compare with the other executions in the same envelope?", "a": "The sealed NNF execution shares its envelope with the open NNCF/NNCL/NNC full-complement bearings but is delivered grease-packed with contact seals and a much lower speed ceiling." }, { "q": "Does the sealed NNF bearing need relubrication?", "a": "NNF bearings are delivered grease-packed and sealed for long service; where the design provides relubrication grooves/holes, replenish through them at the prescribed interval. Never wash the bearing out or exceed the seal-limited speed." } ], "cross_ref": [ { "equiv_sku": "319432", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.5 sealed double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "319432-DA-2LS", "SKF 319432 DA-2LS" ], "locale_variants": {} }, { "sku": "319434-B-2LS", "brand": "SKF", "manufacturer_designation": "SKF 319434 B-2LS", "series": "NNF4900-series", "type": "cylindrical_roller", "d_mm": 170, "D_mm": 230, "B_mm": 80, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 512, "static_load_kN": 1060, "fatigue_load_limit_kN": 110, "max_rpm": 530, "reference_speed_rpm": 530, "limiting_speed_rpm": 530, "weight_g": 9200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF 319434 B-2LS is a sealed double-row full-complement cylindrical roller bearing sized 170×230×80 mm — a dimension series 3194, listed in SKF catalogue PUB BU/P1 17000 ch. 6.5. Structurally, the NNF design has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed. In arrangement terms it is a sealed locating unit for very heavy radial loads; the sealed-for-life execution is the classic crane-sheave bearing. The six-digit order number is SKF's earlier designation convention retained for this 49-series envelope; it is still the factory order number rather than an NNF-series code. Reading the order-string suffix B-2LS: nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. The radial section height is 30.0 mm and the catalogue mass 9200 g; at 512 kN dynamic rating this is roughly 3.01 kN of C per millimetre of bore before application factors. Mounting: mount as a complete sealed unit — never wash out the factory grease; the seals set the speed ceiling, and relubrication, where specified, goes through the ring grooves. A 170 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "heavy dock and shipyard crane systems", "mining dragline and shovel rope sheaves", "large offshore hook blocks and jib sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "seal-lip wear and grease loss in dusty crane and construction service after the relubrication interval is exceeded", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "grease degradation inside the sealed unit after long high-temperature periods, invisible until noise rises", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "The sealed NNF unit is packed for life with the correct grease — do not heat it above the seal limit or wash it before mounting; damaged lip seals invalidate the heavy-load duty.", "The B1 width (79 mm inner-assembly width) differs from the overall B 80 mm; check housing and spacer geometry against both values.", "Catalogue reference and limiting speeds are different criteria, though only the limiting speed is published for this sealed unit: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria, though only the limiting speed is published for this sealed unit: observe the mechanical ceiling even when thermal calculations allow more.", "The 512/1060 kN ratings are SKF catalogue 17000 (2018) values for the B-2LS execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 319434-B-2LS?", "a": "SKF 319434 B-2LS is a sealed double-row full-complement cylindrical roller bearing with 170 mm bore, 230 mm OD and 80 mm width per ISO 15. SKF lists C 512 kN, C0 1060 kN, Pu 110 kN, limiting speed 530 r/min (sealed execution), mass about 9200 g. Inner-assembly width B1 is 79 mm." }, { "q": "What does the NNF designation and B-2LS suffix mean?", "a": "The B-2LS suffix denotes nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. Structurally this execution has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed." }, { "q": "Can 319434-B-2LS take axial load and locate the shaft?", "a": "The sealed NNF unit can guide light axial loads in both directions via the flanged inner ring, but its primary duty is very heavy radial load in sealed positions." }, { "q": "How does 319434-B-2LS compare with the other executions in the same envelope?", "a": "The sealed NNF execution shares its envelope with the open NNCF/NNCL/NNC full-complement bearings but is delivered grease-packed with contact seals and a much lower speed ceiling." }, { "q": "Does the sealed NNF bearing need relubrication?", "a": "NNF bearings are delivered grease-packed and sealed for long service; where the design provides relubrication grooves/holes, replenish through them at the prescribed interval. Never wash the bearing out or exceed the seal-limited speed." } ], "cross_ref": [ { "equiv_sku": "319434", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.5 sealed double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "319434-B-2LS", "SKF 319434 B-2LS" ], "locale_variants": {} }, { "sku": "319436-DA-2LS", "brand": "SKF", "manufacturer_designation": "SKF 319436 DA-2LS", "series": "NNF4900-series", "type": "cylindrical_roller", "d_mm": 180, "D_mm": 240, "B_mm": 80, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 528, "static_load_kN": 1100, "fatigue_load_limit_kN": 114, "max_rpm": 480, "reference_speed_rpm": 480, "limiting_speed_rpm": 480, "weight_g": 9800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF 319436 DA-2LS resolves to a 180×240×80 mm sealed double-row full-complement cylindrical roller bearing (dimension series 3194); a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed. Structurally, the NNF design has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed. In arrangement terms it is a sealed locating unit for very heavy radial loads; the sealed-for-life execution is the classic crane-sheave bearing. The DA-2LS suffix marks the contact-sealed both-side execution in the DA ring configuration; it is a sealed, grease-packed unit. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. The six-digit order number is SKF's earlier designation convention retained for this 49-series envelope; it is still the factory order number rather than an NNF-series code. Selection arithmetic: C0/C ≈ 2.08 (1100 against 528 kN), and the Pu figure 114 kN is the fatigue load-limit floor for the SKF life equation; SKF publishes only a limiting speed of 480 r/min for this sealed execution — the seal contact and packed grease, not a thermal reference speed, set the ceiling. Mounting: mount as a complete sealed unit — never wash out the factory grease; the seals set the speed ceiling, and relubrication, where specified, goes through the ring grooves. A 180 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "mining dragline and shovel rope sheaves", "large offshore hook blocks and jib sheaves", "heavy dock and shipyard crane systems" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "seal-lip wear and grease loss in dusty crane and construction service after the relubrication interval is exceeded", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "grease degradation inside the sealed unit after long high-temperature periods, invisible until noise rises", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "The sealed NNF unit is packed for life with the correct grease — do not heat it above the seal limit or wash it before mounting; damaged lip seals invalidate the heavy-load duty.", "The B1 width (79 mm inner-assembly width) differs from the overall B 80 mm; check housing and spacer geometry against both values.", "Catalogue reference and limiting speeds are different criteria, though only the limiting speed is published for this sealed unit: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 80 mm-wide ring and concentrates load.", "The 528/1100 kN ratings are SKF catalogue 17000 (2018) values for the DA-2LS execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 319436-DA-2LS?", "a": "SKF 319436 DA-2LS is a sealed double-row full-complement cylindrical roller bearing with 180 mm bore, 240 mm OD and 80 mm width per ISO 15. SKF lists C 528 kN, C0 1100 kN, Pu 114 kN, limiting speed 480 r/min (sealed execution), mass about 9800 g. Inner-assembly width B1 is 79 mm." }, { "q": "What does the NNF designation and DA-2LS suffix mean?", "a": "The DA-2LS suffix marks the contact-sealed both-side execution in the DA ring configuration; it is a sealed, grease-packed unit. Structurally this execution has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed." }, { "q": "Can 319436-DA-2LS take axial load and locate the shaft?", "a": "The sealed NNF unit can guide light axial loads in both directions via the flanged inner ring, but its primary duty is very heavy radial load in sealed positions." }, { "q": "How does 319436-DA-2LS compare with the other executions in the same envelope?", "a": "The sealed NNF execution shares its envelope with the open NNCF/NNCL/NNC full-complement bearings but is delivered grease-packed with contact seals and a much lower speed ceiling." }, { "q": "Does the sealed NNF bearing need relubrication?", "a": "NNF bearings are delivered grease-packed and sealed for long service; where the design provides relubrication grooves/holes, replenish through them at the prescribed interval. Never wash the bearing out or exceed the seal-limited speed." } ], "cross_ref": [ { "equiv_sku": "319436", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.5 sealed double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "319436-DA-2LS", "SKF 319436 DA-2LS" ], "locale_variants": {} }, { "sku": "319438-DA-2LS", "brand": "SKF", "manufacturer_designation": "SKF 319438 DA-2LS", "series": "NNF4900-series", "type": "cylindrical_roller", "d_mm": 190, "D_mm": 260, "B_mm": 80, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 550, "static_load_kN": 1180, "fatigue_load_limit_kN": 120, "max_rpm": 450, "reference_speed_rpm": 450, "limiting_speed_rpm": 450, "weight_g": 12500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "319438-DA-2LS is the 190 mm bore entry in the NNF4900 range: a 190×260×80 mm sealed double-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 550 kN / C0 1180 kN. Reading the NNF prefix: a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed. This makes the execution a sealed locating unit for very heavy radial loads; the sealed-for-life execution is the classic crane-sheave bearing. The six-digit order number is SKF's earlier designation convention retained for this 49-series envelope; it is still the factory order number rather than an NNF-series code. Reading the order-string suffix DA-2LS: contact seals on both sides in the DA ring configuration, delivered grease-packed. Selection arithmetic: C0/C ≈ 2.15 (1180 against 550 kN), and the Pu figure 120 kN is the fatigue load-limit floor for the SKF life equation; SKF publishes only a limiting speed of 450 r/min for this sealed execution — the seal contact and packed grease, not a thermal reference speed, set the ceiling. Mounting: mount as a complete sealed unit — never wash out the factory grease; the seals set the speed ceiling, and relubrication, where specified, goes through the ring grooves. A 190 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "large offshore hook blocks and jib sheaves", "heavy dock and shipyard crane systems", "mining dragline and shovel rope sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "seal-lip wear and grease loss in dusty crane and construction service after the relubrication interval is exceeded", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "grease degradation inside the sealed unit after long high-temperature periods, invisible until noise rises", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "The sealed NNF unit is packed for life with the correct grease — do not heat it above the seal limit or wash it before mounting; damaged lip seals invalidate the heavy-load duty.", "The B1 width (79 mm inner-assembly width) differs from the overall B 80 mm; check housing and spacer geometry against both values.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 80 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria, though only the limiting speed is published for this sealed unit: observe the mechanical ceiling even when thermal calculations allow more.", "The 550/1180 kN ratings are SKF catalogue 17000 (2018) values for the DA-2LS execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 319438-DA-2LS?", "a": "SKF 319438 DA-2LS is a sealed double-row full-complement cylindrical roller bearing with 190 mm bore, 260 mm OD and 80 mm width per ISO 15. SKF lists C 550 kN, C0 1180 kN, Pu 120 kN, limiting speed 450 r/min (sealed execution), mass about 12500 g. Inner-assembly width B1 is 79 mm." }, { "q": "What does the NNF designation and DA-2LS suffix mean?", "a": "The DA-2LS suffix marks the contact-sealed both-side execution in the DA ring configuration; it is a sealed, grease-packed unit. Structurally this execution has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed." }, { "q": "Can 319438-DA-2LS take axial load and locate the shaft?", "a": "The sealed NNF unit can guide light axial loads in both directions via the flanged inner ring, but its primary duty is very heavy radial load in sealed positions." }, { "q": "How does 319438-DA-2LS compare with the other executions in the same envelope?", "a": "The sealed NNF execution shares its envelope with the open NNCF/NNCL/NNC full-complement bearings but is delivered grease-packed with contact seals and a much lower speed ceiling." }, { "q": "Does the sealed NNF bearing need relubrication?", "a": "NNF bearings are delivered grease-packed and sealed for long service; where the design provides relubrication grooves/holes, replenish through them at the prescribed interval. Never wash the bearing out or exceed the seal-limited speed." } ], "cross_ref": [ { "equiv_sku": "319438", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.5 sealed double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "319438-DA-2LS", "SKF 319438 DA-2LS" ], "locale_variants": {} }, { "sku": "319440-B-2LS", "brand": "SKF", "manufacturer_designation": "SKF 319440 B-2LS", "series": "NNF4900-series", "type": "cylindrical_roller", "d_mm": 200, "D_mm": 270, "B_mm": 80, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 583, "static_load_kN": 1370, "fatigue_load_limit_kN": 137, "max_rpm": 430, "reference_speed_rpm": 430, "limiting_speed_rpm": 430, "weight_g": 13000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "319440-B-2LS is the 200 mm bore entry in the NNF4900 range: a 200×270×80 mm sealed double-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 583 kN / C0 1370 kN. Structurally, the NNF design has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed. In arrangement terms it is a sealed locating unit for very heavy radial loads; the sealed-for-life execution is the classic crane-sheave bearing. The six-digit order number is SKF's earlier designation convention retained for this 49-series envelope; it is still the factory order number rather than an NNF-series code. Reading the order-string suffix B-2LS: nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. Selection arithmetic: C0/C ≈ 2.35 (1370 against 583 kN), and the Pu figure 137 kN is the fatigue load-limit floor for the SKF life equation; SKF publishes only a limiting speed of 430 r/min for this sealed execution — the seal contact and packed grease, not a thermal reference speed, set the ceiling. Fit practice for 319440-B-2LS: mount as a complete sealed unit — never wash out the factory grease; the seals set the speed ceiling, and relubrication, where specified, goes through the ring grooves. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "large offshore hook blocks and jib sheaves", "heavy dock and shipyard crane systems", "mining dragline and shovel rope sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "seal-lip wear and grease loss in dusty crane and construction service after the relubrication interval is exceeded", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "grease degradation inside the sealed unit after long high-temperature periods, invisible until noise rises", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "The sealed NNF unit is packed for life with the correct grease — do not heat it above the seal limit or wash it before mounting; damaged lip seals invalidate the heavy-load duty.", "The B1 width (79 mm inner-assembly width) differs from the overall B 80 mm; check housing and spacer geometry against both values.", "Catalogue reference and limiting speeds are different criteria, though only the limiting speed is published for this sealed unit: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 270 mm raceway.", "The 583/1370 kN ratings are SKF catalogue 17000 (2018) values for the B-2LS execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 319440-B-2LS?", "a": "SKF 319440 B-2LS is a sealed double-row full-complement cylindrical roller bearing with 200 mm bore, 270 mm OD and 80 mm width per ISO 15. SKF lists C 583 kN, C0 1370 kN, Pu 137 kN, limiting speed 430 r/min (sealed execution), mass about 13000 g. Inner-assembly width B1 is 79 mm." }, { "q": "What does the NNF designation and B-2LS suffix mean?", "a": "The B-2LS suffix denotes nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. Structurally this execution has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed." }, { "q": "Can 319440-B-2LS take axial load and locate the shaft?", "a": "The sealed NNF unit can guide light axial loads in both directions via the flanged inner ring, but its primary duty is very heavy radial load in sealed positions." }, { "q": "How does 319440-B-2LS compare with the other executions in the same envelope?", "a": "The sealed NNF execution shares its envelope with the open NNCF/NNCL/NNC full-complement bearings but is delivered grease-packed with contact seals and a much lower speed ceiling." }, { "q": "Does the sealed NNF bearing need relubrication?", "a": "NNF bearings are delivered grease-packed and sealed for long service; where the design provides relubrication grooves/holes, replenish through them at the prescribed interval. Never wash the bearing out or exceed the seal-limited speed." } ], "cross_ref": [ { "equiv_sku": "319440", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.5 sealed double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "319440-B-2LS", "SKF 319440 B-2LS" ], "locale_variants": {} }, { "sku": "319444-B-2LS", "brand": "SKF", "manufacturer_designation": "SKF 319444 B-2LS", "series": "NNF4900-series", "type": "cylindrical_roller", "d_mm": 220, "D_mm": 300, "B_mm": 95, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 880, "static_load_kN": 1860, "fatigue_load_limit_kN": 190, "max_rpm": 380, "reference_speed_rpm": 380, "limiting_speed_rpm": 380, "weight_g": 19000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "319444-B-2LS is the 220 mm bore entry in the NNF4900 range: a 220×300×95 mm sealed double-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 880 kN / C0 1860 kN. Structurally, the NNF design has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed. In arrangement terms it is a sealed locating unit for very heavy radial loads; the sealed-for-life execution is the classic crane-sheave bearing. The B-2LS suffix denotes nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. The six-digit order number is SKF's earlier designation convention retained for this 49-series envelope; it is still the factory order number rather than an NNF-series code. With C 880 kN and C0 1860 kN, size the bearing on the 220×300 mm ISO 15 envelope and check the 190 kN Pu against the equivalent-load floor; SKF publishes only a limiting speed of 380 r/min for this sealed execution — the seal contact and packed grease, not a thermal reference speed, set the ceiling. Assembly note: mount as a complete sealed unit — never wash out the factory grease; the seals set the speed ceiling, and relubrication, where specified, goes through the ring grooves. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "heavy dock and shipyard crane systems", "mining dragline and shovel rope sheaves", "large offshore hook blocks and jib sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "seal-lip wear and grease loss in dusty crane and construction service after the relubrication interval is exceeded", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "grease degradation inside the sealed unit after long high-temperature periods, invisible until noise rises", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "The sealed NNF unit is packed for life with the correct grease — do not heat it above the seal limit or wash it before mounting; damaged lip seals invalidate the heavy-load duty.", "The B1 width (94 mm inner-assembly width) differs from the overall B 95 mm; check housing and spacer geometry against both values.", "Catalogue reference and limiting speeds are different criteria, though only the limiting speed is published for this sealed unit: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria, though only the limiting speed is published for this sealed unit: observe the mechanical ceiling even when thermal calculations allow more.", "The 880/1860 kN ratings are SKF catalogue 17000 (2018) values for the B-2LS execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 319444-B-2LS?", "a": "SKF 319444 B-2LS is a sealed double-row full-complement cylindrical roller bearing with 220 mm bore, 300 mm OD and 95 mm width per ISO 15. SKF lists C 880 kN, C0 1860 kN, Pu 190 kN, limiting speed 380 r/min (sealed execution), mass about 19000 g. Inner-assembly width B1 is 94 mm." }, { "q": "What does the NNF designation and B-2LS suffix mean?", "a": "The B-2LS suffix denotes nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. Structurally this execution has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed." }, { "q": "Can 319444-B-2LS take axial load and locate the shaft?", "a": "The sealed NNF unit can guide light axial loads in both directions via the flanged inner ring, but its primary duty is very heavy radial load in sealed positions." }, { "q": "How does 319444-B-2LS compare with the other executions in the same envelope?", "a": "The sealed NNF execution shares its envelope with the open NNCF/NNCL/NNC full-complement bearings but is delivered grease-packed with contact seals and a much lower speed ceiling." }, { "q": "Does the sealed NNF bearing need relubrication?", "a": "NNF bearings are delivered grease-packed and sealed for long service; where the design provides relubrication grooves/holes, replenish through them at the prescribed interval. Never wash the bearing out or exceed the seal-limited speed." } ], "cross_ref": [ { "equiv_sku": "319444", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.5 sealed double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "319444-B-2LS", "SKF 319444 B-2LS" ], "locale_variants": {} }, { "sku": "319448-B-2LS", "brand": "SKF", "manufacturer_designation": "SKF 319448 B-2LS", "series": "NNF4900-series", "type": "cylindrical_roller", "d_mm": 240, "D_mm": 320, "B_mm": 95, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 952, "static_load_kN": 2040, "fatigue_load_limit_kN": 200, "max_rpm": 360, "reference_speed_rpm": 360, "limiting_speed_rpm": 360, "weight_g": 20000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF 319448 B-2LS resolves to a 240×320×95 mm sealed double-row full-complement cylindrical roller bearing (dimension series 3194); a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed. Structurally, the NNF design has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed. In arrangement terms it is a sealed locating unit for very heavy radial loads; the sealed-for-life execution is the classic crane-sheave bearing. The B-2LS suffix denotes nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. The six-digit order number is SKF's earlier designation convention retained for this 49-series envelope; it is still the factory order number rather than an NNF-series code. Speed planning for 319448-B-2LS: SKF publishes only a limiting speed of 360 r/min for this sealed execution — the seal contact and packed grease, not a thermal reference speed, set the ceiling. The mass entry 20000 g covers the complete catalogue execution including factory grease fill and both seals. Fit practice for 319448-B-2LS: mount as a complete sealed unit — never wash out the factory grease; the seals set the speed ceiling, and relubrication, where specified, goes through the ring grooves. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "heavy dock and shipyard crane systems", "mining dragline and shovel rope sheaves", "large offshore hook blocks and jib sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "seal-lip wear and grease loss in dusty crane and construction service after the relubrication interval is exceeded", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "grease degradation inside the sealed unit after long high-temperature periods, invisible until noise rises", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "The sealed NNF unit is packed for life with the correct grease — do not heat it above the seal limit or wash it before mounting; damaged lip seals invalidate the heavy-load duty.", "The B1 width (94 mm inner-assembly width) differs from the overall B 95 mm; check housing and spacer geometry against both values.", "Catalogue reference and limiting speeds are different criteria, though only the limiting speed is published for this sealed unit: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria, though only the limiting speed is published for this sealed unit: observe the mechanical ceiling even when thermal calculations allow more.", "The 952/2040 kN ratings are SKF catalogue 17000 (2018) values for the B-2LS execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 319448-B-2LS?", "a": "SKF 319448 B-2LS is a sealed double-row full-complement cylindrical roller bearing with 240 mm bore, 320 mm OD and 95 mm width per ISO 15. SKF lists C 952 kN, C0 2040 kN, Pu 200 kN, limiting speed 360 r/min (sealed execution), mass about 20000 g. Inner-assembly width B1 is 94 mm." }, { "q": "What does the NNF designation and B-2LS suffix mean?", "a": "The B-2LS suffix denotes nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. Structurally this execution has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed." }, { "q": "Can 319448-B-2LS take axial load and locate the shaft?", "a": "The sealed NNF unit can guide light axial loads in both directions via the flanged inner ring, but its primary duty is very heavy radial load in sealed positions." }, { "q": "How does 319448-B-2LS compare with the other executions in the same envelope?", "a": "The sealed NNF execution shares its envelope with the open NNCF/NNCL/NNC full-complement bearings but is delivered grease-packed with contact seals and a much lower speed ceiling." }, { "q": "Does the sealed NNF bearing need relubrication?", "a": "NNF bearings are delivered grease-packed and sealed for long service; where the design provides relubrication grooves/holes, replenish through them at the prescribed interval. Never wash the bearing out or exceed the seal-limited speed." } ], "cross_ref": [ { "equiv_sku": "319448", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.5 sealed double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "319448-B-2LS", "SKF 319448 B-2LS" ], "locale_variants": {} }, { "sku": "319452-B-2LS", "brand": "SKF", "manufacturer_designation": "SKF 319452 B-2LS", "series": "NNF4900-series", "type": "cylindrical_roller", "d_mm": 260, "D_mm": 340, "B_mm": 95, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 990, "static_load_kN": 2160, "fatigue_load_limit_kN": 212, "max_rpm": 340, "reference_speed_rpm": 340, "limiting_speed_rpm": 340, "weight_g": 22000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "319452-B-2LS is the 260 mm bore entry in the NNF4900 range: a 260×340×95 mm sealed double-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 990 kN / C0 2160 kN. Reading the NNF prefix: a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed. This makes the execution a sealed locating unit for very heavy radial loads; the sealed-for-life execution is the classic crane-sheave bearing. The six-digit order number is SKF's earlier designation convention retained for this 49-series envelope; it is still the factory order number rather than an NNF-series code. Reading the order-string suffix B-2LS: nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. Speed planning for 319452-B-2LS: SKF publishes only a limiting speed of 340 r/min for this sealed execution — the seal contact and packed grease, not a thermal reference speed, set the ceiling. The mass entry 22000 g covers the complete catalogue execution including factory grease fill and both seals. Fit practice for 319452-B-2LS: mount as a complete sealed unit — never wash out the factory grease; the seals set the speed ceiling, and relubrication, where specified, goes through the ring grooves. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "mining dragline and shovel rope sheaves", "large offshore hook blocks and jib sheaves", "heavy dock and shipyard crane systems" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "seal-lip wear and grease loss in dusty crane and construction service after the relubrication interval is exceeded", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "grease degradation inside the sealed unit after long high-temperature periods, invisible until noise rises", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "The sealed NNF unit is packed for life with the correct grease — do not heat it above the seal limit or wash it before mounting; damaged lip seals invalidate the heavy-load duty.", "The B1 width (94 mm inner-assembly width) differs from the overall B 95 mm; check housing and spacer geometry against both values.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 95 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 340 mm raceway.", "The 990/2160 kN ratings are SKF catalogue 17000 (2018) values for the B-2LS execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of 319452-B-2LS?", "a": "SKF 319452 B-2LS is a sealed double-row full-complement cylindrical roller bearing with 260 mm bore, 340 mm OD and 95 mm width per ISO 15. SKF lists C 990 kN, C0 2160 kN, Pu 212 kN, limiting speed 340 r/min (sealed execution), mass about 22000 g. Inner-assembly width B1 is 94 mm." }, { "q": "What does the NNF designation and B-2LS suffix mean?", "a": "The B-2LS suffix denotes nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. Structurally this execution has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed." }, { "q": "Can 319452-B-2LS take axial load and locate the shaft?", "a": "The sealed NNF unit can guide light axial loads in both directions via the flanged inner ring, but its primary duty is very heavy radial load in sealed positions." }, { "q": "How does 319452-B-2LS compare with the other executions in the same envelope?", "a": "The sealed NNF execution shares its envelope with the open NNCF/NNCL/NNC full-complement bearings but is delivered grease-packed with contact seals and a much lower speed ceiling." }, { "q": "Does the sealed NNF bearing need relubrication?", "a": "NNF bearings are delivered grease-packed and sealed for long service; where the design provides relubrication grooves/holes, replenish through them at the prescribed interval. Never wash the bearing out or exceed the seal-limited speed." } ], "cross_ref": [ { "equiv_sku": "319452", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.5 sealed double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "319452-B-2LS", "SKF 319452 B-2LS" ], "locale_variants": {} }, { "sku": "N203-ECP", "brand": "SKF", "manufacturer_designation": "SKF N 203 ECP", "series": "N200-series", "type": "cylindrical_roller", "d_mm": 17, "D_mm": 40, "B_mm": 12, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 20, "static_load_kN": 14.3, "fatigue_load_limit_kN": 1.73, "max_rpm": 22000, "reference_speed_rpm": 20000, "limiting_speed_rpm": 22000, "weight_g": 66, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 17 mm shaft, SKF lists N203-ECP as single-row caged cylindrical roller: 40 mm OD, 12 mm wide, Pu 1.73 kN, the catalogue lists 20,000 r/min thermal reference speed and 22,000 r/min mechanical limiting speed. Reading the N prefix: two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. This makes the execution non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Selection arithmetic: C0/C ≈ 0.72 (14.3 against 20 kN), and the Pu figure 1.73 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 20,000 r/min thermal reference speed and 22,000 r/min mechanical limiting speed. Fit practice for N203-ECP: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "small industrial electric-motor shafts", "light gearbox layshafts", "motor-cycle and small-engine transmissions", "appliance and fan armature shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Do not use a N bearing where axial load must be carried — the design carries radial load only", "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 203, but flange configuration and axial-locating behaviour differ — quote the full SKF N 203 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 12 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 40 mm raceway.", "The 20/14.3 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of N203-ECP?", "a": "SKF N 203 ECP is a single-row caged cylindrical roller bearing with 17 mm bore, 40 mm OD and 12 mm width per ISO 15. SKF lists C 20 kN, C0 14.3 kN, Pu 1.73 kN, reference speed 20,000 r/min and limiting speed 22,000 r/min, mass about 66 g." }, { "q": "What does the N designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part." }, { "q": "Can N203-ECP take axial load and locate the shaft?", "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing." }, { "q": "How does N203-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ203-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 17×40×12 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU203-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 17×40×12 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP203-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 17×40×12 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "N203-ECP", "SKF N 203 ECP" ], "locale_variants": {} }, { "sku": "N204-ECP", "brand": "SKF", "manufacturer_designation": "SKF N 204 ECP", "series": "N200-series", "type": "cylindrical_roller", "d_mm": 20, "D_mm": 47, "B_mm": 14, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 28.5, "static_load_kN": 22, "fatigue_load_limit_kN": 2.75, "max_rpm": 19000, "reference_speed_rpm": 17000, "limiting_speed_rpm": 19000, "weight_g": 110, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF N 204 ECP is a single-row caged cylindrical roller bearing sized 20×47×14 mm — a dimension series 2 (light-section ISO 15 envelope), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. Structurally, the N design has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. In arrangement terms it is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The radial section height is 13.5 mm and the catalogue mass 110 g; at 28.5 kN dynamic rating this is roughly 1.43 kN of C per millimetre of bore before application factors. Mounting: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. A 20 mm seat normally takes a k5 interference with an H7 housing bore when the inner ring rotates.", "applications": [ "light gearbox layshafts", "motor-cycle and small-engine transmissions", "appliance and fan armature shafts", "small pump rotor shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Do not use a N bearing where axial load must be carried — the design carries radial load only", "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 204, but flange configuration and axial-locating behaviour differ — quote the full SKF N 204 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 47 mm raceway.", "The 28.5/22 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of N204-ECP?", "a": "SKF N 204 ECP is a single-row caged cylindrical roller bearing with 20 mm bore, 47 mm OD and 14 mm width per ISO 15. SKF lists C 28.5 kN, C0 22 kN, Pu 2.75 kN, reference speed 17,000 r/min and limiting speed 19,000 r/min, mass about 110 g." }, { "q": "What does the N designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part." }, { "q": "Can N204-ECP take axial load and locate the shaft?", "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing." }, { "q": "How does N204-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ204-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 20×47×14 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP204-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 20×47×14 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU204", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 20×47×14 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "N204-ECP", "SKF N 204 ECP" ], "locale_variants": {} }, { "sku": "N205-ECP", "brand": "SKF", "manufacturer_designation": "SKF N 205 ECP", "series": "N200-series", "type": "cylindrical_roller", "d_mm": 25, "D_mm": 52, "B_mm": 15, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 32.5, "static_load_kN": 27, "fatigue_load_limit_kN": 3.35, "max_rpm": 16000, "reference_speed_rpm": 15000, "limiting_speed_rpm": 16000, "weight_g": 130, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF N 205 ECP is a single-row caged cylindrical roller bearing sized 25×52×15 mm — a dimension series 2 (light-section ISO 15 envelope), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. The N configuration means two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part; functionally the bearing is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. With C 32.5 kN and C0 27 kN, size the bearing on the 25×52 mm ISO 15 envelope and check the 3.35 kN Pu against the equivalent-load floor; the catalogue lists 15,000 r/min thermal reference speed and 16,000 r/min mechanical limiting speed. Fit practice for N205-ECP: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "motor-cycle and small-engine transmissions", "appliance and fan armature shafts", "small pump rotor shafts", "small industrial electric-motor shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "Do not use a N bearing where axial load must be carried — the design carries radial load only", "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 205, but flange configuration and axial-locating behaviour differ — quote the full SKF N 205 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 52 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 52 mm raceway.", "The 32.5/27 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of N205-ECP?", "a": "SKF N 205 ECP is a single-row caged cylindrical roller bearing with 25 mm bore, 52 mm OD and 15 mm width per ISO 15. SKF lists C 32.5 kN, C0 27 kN, Pu 3.35 kN, reference speed 15,000 r/min and limiting speed 16,000 r/min, mass about 130 g." }, { "q": "What does the N designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part." }, { "q": "Can N205-ECP take axial load and locate the shaft?", "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing." }, { "q": "How does N205-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ205-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 25×52×15 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP205-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 25×52×15 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU205", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 25×52×15 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "N205-ECP", "SKF N 205 ECP" ], "locale_variants": {} }, { "sku": "N206-ECP", "brand": "SKF", "manufacturer_designation": "SKF N 206 ECP", "series": "N200-series", "type": "cylindrical_roller", "d_mm": 30, "D_mm": 62, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 44, "static_load_kN": 36.5, "fatigue_load_limit_kN": 4.5, "max_rpm": 14000, "reference_speed_rpm": 13000, "limiting_speed_rpm": 14000, "weight_g": 200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF N 206 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 30×62×16 mm envelope, dimension series 2 (light-section ISO 15 envelope), with catalogue mass 200 g. Structurally, the N design has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. In arrangement terms it is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Load-per-bore for the 30 mm seat is about 1.47 kN/mm, typical of dimension series 2 (light-section ISO 15 envelope); use C0 36.5 kN for static checks such as crane hook blocks standing under load. Mounting: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. A 30 mm seat normally takes a k5 interference with an H7 housing bore when the inner ring rotates.", "applications": [ "conveyor drive-pulley shafts", "medium industrial gearbox shafts", "electric-motor shafts in pumps and fans", "compressor crank and rotor shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Do not use a N bearing where axial load must be carried — the design carries radial load only", "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 206, but flange configuration and axial-locating behaviour differ — quote the full SKF N 206 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 62 mm raceway.", "The 44/36.5 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of N206-ECP?", "a": "SKF N 206 ECP is a single-row caged cylindrical roller bearing with 30 mm bore, 62 mm OD and 16 mm width per ISO 15. SKF lists C 44 kN, C0 36.5 kN, Pu 4.5 kN, reference speed 13,000 r/min and limiting speed 14,000 r/min, mass about 200 g." }, { "q": "What does the N designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part." }, { "q": "Can N206-ECP take axial load and locate the shaft?", "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing." }, { "q": "How does N206-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ206-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 30×62×16 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP206-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 30×62×16 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU206", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 30×62×16 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "N206-ECP", "SKF N 206 ECP" ], "locale_variants": {} }, { "sku": "N207-ECP", "brand": "SKF", "manufacturer_designation": "SKF N 207 ECP", "series": "N200-series", "type": "cylindrical_roller", "d_mm": 35, "D_mm": 72, "B_mm": 17, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 56, "static_load_kN": 48, "fatigue_load_limit_kN": 6.1, "max_rpm": 12000, "reference_speed_rpm": 11000, "limiting_speed_rpm": 12000, "weight_g": 300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF N 207 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 35×72×17 mm envelope, dimension series 2 (light-section ISO 15 envelope), with catalogue mass 300 g. The N configuration means two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part; functionally the bearing is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Selection arithmetic: C0/C ≈ 0.86 (48 against 56 kN), and the Pu figure 6.1 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 11,000 r/min thermal reference speed and 12,000 r/min mechanical limiting speed. Fit practice for N207-ECP: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "medium industrial gearbox shafts", "electric-motor shafts in pumps and fans", "compressor crank and rotor shafts", "machine-tool radial spindle supports" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Do not use a N bearing where axial load must be carried — the design carries radial load only", "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 207, but flange configuration and axial-locating behaviour differ — quote the full SKF N 207 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 72 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 72 mm raceway.", "The 56/48 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of N207-ECP?", "a": "SKF N 207 ECP is a single-row caged cylindrical roller bearing with 35 mm bore, 72 mm OD and 17 mm width per ISO 15. SKF lists C 56 kN, C0 48 kN, Pu 6.1 kN, reference speed 11,000 r/min and limiting speed 12,000 r/min, mass about 300 g." }, { "q": "What does the N designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part." }, { "q": "Can N207-ECP take axial load and locate the shaft?", "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing." }, { "q": "How does N207-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ207-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 35×72×17 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP207-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 35×72×17 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU207", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 35×72×17 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "N207-ECP", "SKF N 207 ECP" ], "locale_variants": {} }, { "sku": "N208-ECP", "brand": "SKF", "manufacturer_designation": "SKF N 208 ECP", "series": "N200-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 80, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 62, "static_load_kN": 53, "fatigue_load_limit_kN": 6.7, "max_rpm": 11000, "reference_speed_rpm": 9500, "limiting_speed_rpm": 11000, "weight_g": 370, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF N 208 ECP resolves to a 40×80×18 mm single-row caged cylindrical roller bearing (dimension series 2 (light-section ISO 15 envelope)); two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. Reading the N prefix: two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. This makes the execution non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The radial section height is 20.0 mm and the catalogue mass 370 g; at 62 kN dynamic rating this is roughly 1.55 kN of C per millimetre of bore before application factors. Mounting: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. A 40 mm seat normally takes a k5 interference with an H7 housing bore when the inner ring rotates.", "applications": [ "electric-motor shafts in pumps and fans", "compressor crank and rotor shafts", "machine-tool radial spindle supports", "conveyor drive-pulley shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "Do not use a N bearing where axial load must be carried — the design carries radial load only", "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 208, but flange configuration and axial-locating behaviour differ — quote the full SKF N 208 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 18 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 80 mm raceway.", "The 62/53 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of N208-ECP?", "a": "SKF N 208 ECP is a single-row caged cylindrical roller bearing with 40 mm bore, 80 mm OD and 18 mm width per ISO 15. SKF lists C 62 kN, C0 53 kN, Pu 6.7 kN, reference speed 9,500 r/min and limiting speed 11,000 r/min, mass about 370 g." }, { "q": "What does the N designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part." }, { "q": "Can N208-ECP take axial load and locate the shaft?", "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing." }, { "q": "How does N208-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "N208", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NJ208-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 40×80×18 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP208-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 40×80×18 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU208", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 40×80×18 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "N208-ECP", "SKF N 208 ECP" ], "locale_variants": {} }, { "sku": "N209-ECP", "brand": "SKF", "manufacturer_designation": "SKF N 209 ECP", "series": "N200-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 85, "B_mm": 19, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 69.5, "static_load_kN": 64, "fatigue_load_limit_kN": 8.15, "max_rpm": 9500, "reference_speed_rpm": 9000, "limiting_speed_rpm": 9500, "weight_g": 430, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N209-ECP is the 45 mm bore entry in the N200 range: a 45×85×19 mm single-row caged cylindrical roller bearing with a glass-fibre reinforced polyamide (PA66) window-type cage, rated C 69.5 kN / C0 64 kN. Structurally, the N design has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. In arrangement terms it is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. With C 69.5 kN and C0 64 kN, size the bearing on the 45×85 mm ISO 15 envelope and check the 8.15 kN Pu against the equivalent-load floor; the catalogue lists 9,000 r/min thermal reference speed and 9,500 r/min mechanical limiting speed. Assembly note: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.", "applications": [ "compressor crank and rotor shafts", "machine-tool radial spindle supports", "conveyor drive-pulley shafts", "medium industrial gearbox shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Do not use a N bearing where axial load must be carried — the design carries radial load only", "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 209, but flange configuration and axial-locating behaviour differ — quote the full SKF N 209 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 85 mm raceway.", "The 69.5/64 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of N209-ECP?", "a": "SKF N 209 ECP is a single-row caged cylindrical roller bearing with 45 mm bore, 85 mm OD and 19 mm width per ISO 15. SKF lists C 69.5 kN, C0 64 kN, Pu 8.15 kN, reference speed 9,000 r/min and limiting speed 9,500 r/min, mass about 430 g." }, { "q": "What does the N designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part." }, { "q": "Can N209-ECP take axial load and locate the shaft?", "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing." }, { "q": "How does N209-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "N209", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NJ209-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 45×85×19 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP209-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 45×85×19 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU209", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 45×85×19 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "N209-ECP", "SKF N 209 ECP" ], "locale_variants": {} }, { "sku": "N210-ECP", "brand": "SKF", "manufacturer_designation": "SKF N 210 ECP", "series": "N200-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 90, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 73.5, "static_load_kN": 69.5, "fatigue_load_limit_kN": 8.8, "max_rpm": 9000, "reference_speed_rpm": 8500, "limiting_speed_rpm": 9000, "weight_g": 480, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF N 210 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 50×90×20 mm envelope, dimension series 2 (light-section ISO 15 envelope), with catalogue mass 480 g. Reading the N prefix: two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. This makes the execution non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. Speed planning for N210-ECP: the catalogue lists 8,500 r/min thermal reference speed and 9,000 r/min mechanical limiting speed. The mass entry 480 g covers the complete catalogue execution. Mounting: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. A 50 mm seat normally takes a k5 interference with an H7 housing bore when the inner ring rotates.", "applications": [ "machine-tool radial spindle supports", "conveyor drive-pulley shafts", "medium industrial gearbox shafts", "electric-motor shafts in pumps and fans" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Do not use a N bearing where axial load must be carried — the design carries radial load only", "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 210, but flange configuration and axial-locating behaviour differ — quote the full SKF N 210 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 20 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 20 mm-wide ring and concentrates load.", "The 73.5/69.5 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of N210-ECP?", "a": "SKF N 210 ECP is a single-row caged cylindrical roller bearing with 50 mm bore, 90 mm OD and 20 mm width per ISO 15. SKF lists C 73.5 kN, C0 69.5 kN, Pu 8.8 kN, reference speed 8,500 r/min and limiting speed 9,000 r/min, mass about 480 g." }, { "q": "What does the N designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part." }, { "q": "Can N210-ECP take axial load and locate the shaft?", "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing." }, { "q": "How does N210-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "N210", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NJ210-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 50×90×20 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP210-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 50×90×20 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU210", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 50×90×20 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "N210-ECP", "SKF N 210 ECP" ], "locale_variants": {} }, { "sku": "N211-ECP", "brand": "SKF", "manufacturer_designation": "SKF N 211 ECP", "series": "N200-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 100, "B_mm": 21, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 96.5, "static_load_kN": 95, "fatigue_load_limit_kN": 12.2, "max_rpm": 8000, "reference_speed_rpm": 7500, "limiting_speed_rpm": 8000, "weight_g": 650, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF N 211 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 55×100×21 mm envelope, dimension series 2 (light-section ISO 15 envelope), with catalogue mass 650 g. Structurally, the N design has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. In arrangement terms it is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Load-per-bore for the 55 mm seat is about 1.75 kN/mm, typical of dimension series 2 (light-section ISO 15 envelope); use C0 95 kN for static checks such as crane hook blocks standing under load. Fit practice for N211-ECP: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "conveyor drive-pulley shafts", "medium industrial gearbox shafts", "electric-motor shafts in pumps and fans", "compressor crank and rotor shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Do not use a N bearing where axial load must be carried — the design carries radial load only", "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 211, but flange configuration and axial-locating behaviour differ — quote the full SKF N 211 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 21 mm-wide ring and concentrates load.", "The 96.5/95 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of N211-ECP?", "a": "SKF N 211 ECP is a single-row caged cylindrical roller bearing with 55 mm bore, 100 mm OD and 21 mm width per ISO 15. SKF lists C 96.5 kN, C0 95 kN, Pu 12.2 kN, reference speed 7,500 r/min and limiting speed 8,000 r/min, mass about 650 g." }, { "q": "What does the N designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part." }, { "q": "Can N211-ECP take axial load and locate the shaft?", "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing." }, { "q": "How does N211-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "N211", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NJ211-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 55×100×21 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP211-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 55×100×21 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU211", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 55×100×21 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "N211-ECP", "SKF N 211 ECP" ], "locale_variants": {} }, { "sku": "N212-ECP", "brand": "SKF", "manufacturer_designation": "SKF N 212 ECP", "series": "N200-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 110, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 108, "static_load_kN": 102, "fatigue_load_limit_kN": 13.4, "max_rpm": 7500, "reference_speed_rpm": 6700, "limiting_speed_rpm": 7500, "weight_g": 790, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF N 212 ECP resolves to a 60×110×22 mm single-row caged cylindrical roller bearing (dimension series 2 (light-section ISO 15 envelope)); two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. The N configuration means two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part; functionally the bearing is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 0.94 (102 against 108 kN), and the Pu figure 13.4 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 6,700 r/min thermal reference speed and 7,500 r/min mechanical limiting speed. Mounting: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. A 60 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "heavy gearbox and pinion shafts", "large pump and blower rotors", "rolling-mill auxiliary drive shafts", "paper-machine press rolls" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Do not use a N bearing where axial load must be carried — the design carries radial load only", "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 212, but flange configuration and axial-locating behaviour differ — quote the full SKF N 212 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 110 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 22 mm-wide ring and concentrates load.", "The 108/102 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of N212-ECP?", "a": "SKF N 212 ECP is a single-row caged cylindrical roller bearing with 60 mm bore, 110 mm OD and 22 mm width per ISO 15. SKF lists C 108 kN, C0 102 kN, Pu 13.4 kN, reference speed 6,700 r/min and limiting speed 7,500 r/min, mass about 790 g." }, { "q": "What does the N designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part." }, { "q": "Can N212-ECP take axial load and locate the shaft?", "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing." }, { "q": "How does N212-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "N212", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NJ212-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 60×110×22 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP212-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 60×110×22 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU212", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 60×110×22 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "N212-ECP", "SKF N 212 ECP" ], "locale_variants": {} }, { "sku": "N213-ECP", "brand": "SKF", "manufacturer_designation": "SKF N 213 ECP", "series": "N200-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 120, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 122, "static_load_kN": 118, "fatigue_load_limit_kN": 15.6, "max_rpm": 6700, "reference_speed_rpm": 6300, "limiting_speed_rpm": 6700, "weight_g": 1050, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N213-ECP is the 65 mm bore entry in the N200 range: a 65×120×23 mm single-row caged cylindrical roller bearing with a glass-fibre reinforced polyamide (PA66) window-type cage, rated C 122 kN / C0 118 kN. Structurally, the N design has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. In arrangement terms it is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. With C 122 kN and C0 118 kN, size the bearing on the 65×120 mm ISO 15 envelope and check the 15.6 kN Pu against the equivalent-load floor; the catalogue lists 6,300 r/min thermal reference speed and 6,700 r/min mechanical limiting speed. Assembly note: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.", "applications": [ "rolling-mill auxiliary drive shafts", "paper-machine press rolls", "cement-plant conveyor drives", "heavy gearbox and pinion shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "Do not use a N bearing where axial load must be carried — the design carries radial load only", "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 213, but flange configuration and axial-locating behaviour differ — quote the full SKF N 213 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 23 mm-wide ring and concentrates load.", "The 122/118 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of N213-ECP?", "a": "SKF N 213 ECP is a single-row caged cylindrical roller bearing with 65 mm bore, 120 mm OD and 23 mm width per ISO 15. SKF lists C 122 kN, C0 118 kN, Pu 15.6 kN, reference speed 6,300 r/min and limiting speed 6,700 r/min, mass about 1050 g." }, { "q": "What does the N designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part." }, { "q": "Can N213-ECP take axial load and locate the shaft?", "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing." }, { "q": "How does N213-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "N213", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NJ213-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 65×120×23 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP213-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 65×120×23 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU213", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 65×120×23 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "N213-ECP", "SKF N 213 ECP" ], "locale_variants": {} }, { "sku": "N214-ECP", "brand": "SKF", "manufacturer_designation": "SKF N 214 ECP", "series": "N200-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 125, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 137, "static_load_kN": 137, "fatigue_load_limit_kN": 18, "max_rpm": 6300, "reference_speed_rpm": 6000, "limiting_speed_rpm": 6300, "weight_g": 1100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N214-ECP is the 70 mm bore entry in the N200 range: a 70×125×24 mm single-row caged cylindrical roller bearing with a glass-fibre reinforced polyamide (PA66) window-type cage, rated C 137 kN / C0 137 kN. The N configuration means two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part; functionally the bearing is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. Speed planning for N214-ECP: the catalogue lists 6,000 r/min thermal reference speed and 6,300 r/min mechanical limiting speed. The mass entry 1100 g covers the complete catalogue execution. Mounting: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. A 70 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "paper-machine press rolls", "cement-plant conveyor drives", "heavy gearbox and pinion shafts", "large pump and blower rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Do not use a N bearing where axial load must be carried — the design carries radial load only", "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 214, but flange configuration and axial-locating behaviour differ — quote the full SKF N 214 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 125 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 24 mm-wide ring and concentrates load.", "The 137/137 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of N214-ECP?", "a": "SKF N 214 ECP is a single-row caged cylindrical roller bearing with 70 mm bore, 125 mm OD and 24 mm width per ISO 15. SKF lists C 137 kN, C0 137 kN, Pu 18 kN, reference speed 6,000 r/min and limiting speed 6,300 r/min, mass about 1100 g." }, { "q": "What does the N designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part." }, { "q": "Can N214-ECP take axial load and locate the shaft?", "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing." }, { "q": "How does N214-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "N214", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NJ214-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 70×125×24 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP214-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 70×125×24 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU214", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 70×125×24 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "N214-ECP", "SKF N 214 ECP" ], "locale_variants": {} }, { "sku": "N215-ECP", "brand": "SKF", "manufacturer_designation": "SKF N 215 ECP", "series": "N200-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 130, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 150, "static_load_kN": 156, "fatigue_load_limit_kN": 20.4, "max_rpm": 6000, "reference_speed_rpm": 5600, "limiting_speed_rpm": 6000, "weight_g": 1200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 75 mm shaft, SKF lists N215-ECP as single-row caged cylindrical roller: 130 mm OD, 25 mm wide, Pu 20.4 kN, the catalogue lists 5,600 r/min thermal reference speed and 6,000 r/min mechanical limiting speed. Reading the N prefix: two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. This makes the execution non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Load-per-bore for the 75 mm seat is about 2.00 kN/mm, typical of dimension series 2 (light-section ISO 15 envelope); use C0 156 kN for static checks such as crane hook blocks standing under load. Assembly note: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.", "applications": [ "cement-plant conveyor drives", "heavy gearbox and pinion shafts", "large pump and blower rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Do not use a N bearing where axial load must be carried — the design carries radial load only", "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 215, but flange configuration and axial-locating behaviour differ — quote the full SKF N 215 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 25 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 25 mm-wide ring and concentrates load.", "The 150/156 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of N215-ECP?", "a": "SKF N 215 ECP is a single-row caged cylindrical roller bearing with 75 mm bore, 130 mm OD and 25 mm width per ISO 15. SKF lists C 150 kN, C0 156 kN, Pu 20.4 kN, reference speed 5,600 r/min and limiting speed 6,000 r/min, mass about 1200 g." }, { "q": "What does the N designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part." }, { "q": "Can N215-ECP take axial load and locate the shaft?", "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing." }, { "q": "How does N215-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "N215", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NJ215-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 75×130×25 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP215-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 75×130×25 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU215", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 75×130×25 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "N215-ECP", "SKF N 215 ECP" ], "locale_variants": {} }, { "sku": "N216-ECP", "brand": "SKF", "manufacturer_designation": "SKF N 216 ECP", "series": "N200-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 140, "B_mm": 26, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 160, "static_load_kN": 166, "fatigue_load_limit_kN": 21.2, "max_rpm": 5600, "reference_speed_rpm": 5300, "limiting_speed_rpm": 5600, "weight_g": 1550, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 80 mm shaft, SKF lists N216-ECP as single-row caged cylindrical roller: 140 mm OD, 26 mm wide, Pu 21.2 kN, the catalogue lists 5,300 r/min thermal reference speed and 5,600 r/min mechanical limiting speed. Structurally, the N design has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. In arrangement terms it is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 1.04 (166 against 160 kN), and the Pu figure 21.2 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 5,300 r/min thermal reference speed and 5,600 r/min mechanical limiting speed. Mounting: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. A 80 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "heavy gearbox and pinion shafts", "large pump and blower rotors", "rolling-mill auxiliary drive shafts", "paper-machine press rolls" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "Do not use a N bearing where axial load must be carried — the design carries radial load only", "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 216, but flange configuration and axial-locating behaviour differ — quote the full SKF N 216 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 26 mm-wide ring and concentrates load.", "The 160/166 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of N216-ECP?", "a": "SKF N 216 ECP is a single-row caged cylindrical roller bearing with 80 mm bore, 140 mm OD and 26 mm width per ISO 15. SKF lists C 160 kN, C0 166 kN, Pu 21.2 kN, reference speed 5,300 r/min and limiting speed 5,600 r/min, mass about 1550 g." }, { "q": "What does the N designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part." }, { "q": "Can N216-ECP take axial load and locate the shaft?", "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing." }, { "q": "How does N216-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "N216", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NJ216-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 80×140×26 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP216-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 80×140×26 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU216", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 80×140×26 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "N216-ECP", "SKF N 216 ECP" ], "locale_variants": {} }, { "sku": "N217-ECP", "brand": "SKF", "manufacturer_designation": "SKF N 217 ECP", "series": "N200-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 150, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 190, "static_load_kN": 200, "fatigue_load_limit_kN": 25, "max_rpm": 5300, "reference_speed_rpm": 4800, "limiting_speed_rpm": 5300, "weight_g": 1900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF N 217 ECP is a single-row caged cylindrical roller bearing sized 85×150×28 mm — a dimension series 2 (light-section ISO 15 envelope), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. The N configuration means two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part; functionally the bearing is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The radial section height is 32.5 mm and the catalogue mass 1900 g; at 190 kN dynamic rating this is roughly 2.24 kN of C per millimetre of bore before application factors. Assembly note: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.", "applications": [ "large pump and blower rotors", "rolling-mill auxiliary drive shafts", "paper-machine press rolls", "cement-plant conveyor drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Do not use a N bearing where axial load must be carried — the design carries radial load only", "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 217, but flange configuration and axial-locating behaviour differ — quote the full SKF N 217 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 150 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 28 mm-wide ring and concentrates load.", "The 190/200 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of N217-ECP?", "a": "SKF N 217 ECP is a single-row caged cylindrical roller bearing with 85 mm bore, 150 mm OD and 28 mm width per ISO 15. SKF lists C 190 kN, C0 200 kN, Pu 25 kN, reference speed 4,800 r/min and limiting speed 5,300 r/min, mass about 1900 g." }, { "q": "What does the N designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part." }, { "q": "Can N217-ECP take axial load and locate the shaft?", "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing." }, { "q": "How does N217-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "N217", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NJ217-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 85×150×28 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP217-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 85×150×28 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU217", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 85×150×28 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "N217-ECP", "SKF N 217 ECP" ], "locale_variants": {} }, { "sku": "N218-ECP", "brand": "SKF", "manufacturer_designation": "SKF N 218 ECP", "series": "N200-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 160, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 208, "static_load_kN": 220, "fatigue_load_limit_kN": 27, "max_rpm": 5000, "reference_speed_rpm": 4500, "limiting_speed_rpm": 5000, "weight_g": 2300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF N 218 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 90×160×30 mm envelope, dimension series 2 (light-section ISO 15 envelope), with catalogue mass 2300 g. Reading the N prefix: two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. This makes the execution non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. With C 208 kN and C0 220 kN, size the bearing on the 90×160 mm ISO 15 envelope and check the 27 kN Pu against the equivalent-load floor; the catalogue lists 4,500 r/min thermal reference speed and 5,000 r/min mechanical limiting speed. Fit practice for N218-ECP: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "rolling-mill auxiliary drive shafts", "paper-machine press rolls", "cement-plant conveyor drives", "heavy gearbox and pinion shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Do not use a N bearing where axial load must be carried — the design carries radial load only", "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 218, but flange configuration and axial-locating behaviour differ — quote the full SKF N 218 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 30 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 30 mm-wide ring and concentrates load.", "The 208/220 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of N218-ECP?", "a": "SKF N 218 ECP is a single-row caged cylindrical roller bearing with 90 mm bore, 160 mm OD and 30 mm width per ISO 15. SKF lists C 208 kN, C0 220 kN, Pu 27 kN, reference speed 4,500 r/min and limiting speed 5,000 r/min, mass about 2300 g." }, { "q": "What does the N designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part." }, { "q": "Can N218-ECP take axial load and locate the shaft?", "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing." }, { "q": "How does N218-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "N218", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NJ218-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 90×160×30 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP218-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 90×160×30 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU218", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 90×160×30 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "N218-ECP", "SKF N 218 ECP" ], "locale_variants": {} }, { "sku": "N219-ECP", "brand": "SKF", "manufacturer_designation": "SKF N 219 ECP", "series": "N200-series", "type": "cylindrical_roller", "d_mm": 95, "D_mm": 170, "B_mm": 32, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 255, "static_load_kN": 265, "fatigue_load_limit_kN": 32.5, "max_rpm": 4800, "reference_speed_rpm": 4300, "limiting_speed_rpm": 4800, "weight_g": 2850, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF N 219 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 95×170×32 mm envelope, dimension series 2 (light-section ISO 15 envelope), with catalogue mass 2850 g. Structurally, the N design has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. In arrangement terms it is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Speed planning for N219-ECP: the catalogue lists 4,300 r/min thermal reference speed and 4,800 r/min mechanical limiting speed. The mass entry 2850 g covers the complete catalogue execution. Assembly note: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.", "applications": [ "paper-machine press rolls", "cement-plant conveyor drives", "heavy gearbox and pinion shafts", "large pump and blower rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "Do not use a N bearing where axial load must be carried — the design carries radial load only", "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 219, but flange configuration and axial-locating behaviour differ — quote the full SKF N 219 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 32 mm-wide ring and concentrates load.", "The 255/265 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of N219-ECP?", "a": "SKF N 219 ECP is a single-row caged cylindrical roller bearing with 95 mm bore, 170 mm OD and 32 mm width per ISO 15. SKF lists C 255 kN, C0 265 kN, Pu 32.5 kN, reference speed 4,300 r/min and limiting speed 4,800 r/min, mass about 2850 g." }, { "q": "What does the N designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part." }, { "q": "Can N219-ECP take axial load and locate the shaft?", "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing." }, { "q": "How does N219-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "N219", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NJ219-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 95×170×32 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP219-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 95×170×32 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU219", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 95×170×32 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "N219-ECP", "SKF N 219 ECP" ], "locale_variants": {} }, { "sku": "N220-ECP", "brand": "SKF", "manufacturer_designation": "SKF N 220 ECP", "series": "N200-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 180, "B_mm": 34, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 285, "static_load_kN": 305, "fatigue_load_limit_kN": 36.5, "max_rpm": 4500, "reference_speed_rpm": 4000, "limiting_speed_rpm": 4500, "weight_g": 3450, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF N 220 ECP is a single-row caged cylindrical roller bearing sized 100×180×34 mm — a dimension series 2 (light-section ISO 15 envelope), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. Structurally, the N design has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. In arrangement terms it is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Load-per-bore for the 100 mm seat is about 2.85 kN/mm, typical of dimension series 2 (light-section ISO 15 envelope); use C0 305 kN for static checks such as crane hook blocks standing under load. Mounting: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. A 100 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "cement-plant conveyor drives", "heavy gearbox and pinion shafts", "large pump and blower rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Do not use a N bearing where axial load must be carried — the design carries radial load only", "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 220, but flange configuration and axial-locating behaviour differ — quote the full SKF N 220 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 180 mm raceway.", "The 285/305 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of N220-ECP?", "a": "SKF N 220 ECP is a single-row caged cylindrical roller bearing with 100 mm bore, 180 mm OD and 34 mm width per ISO 15. SKF lists C 285 kN, C0 305 kN, Pu 36.5 kN, reference speed 4,000 r/min and limiting speed 4,500 r/min, mass about 3450 g." }, { "q": "What does the N designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part." }, { "q": "Can N220-ECP take axial load and locate the shaft?", "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing." }, { "q": "How does N220-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "N220", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NJ220-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 100×180×34 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP220-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 100×180×34 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU220", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 100×180×34 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "N220-ECP", "SKF N 220 ECP" ], "locale_variants": {} }, { "sku": "N221-ECP", "brand": "SKF", "manufacturer_designation": "SKF N 221 ECP", "series": "N200-series", "type": "cylindrical_roller", "d_mm": 105, "D_mm": 190, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 300, "static_load_kN": 315, "fatigue_load_limit_kN": 36.5, "max_rpm": 4300, "reference_speed_rpm": 3800, "limiting_speed_rpm": 4300, "weight_g": 3900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF N 221 ECP is a single-row caged cylindrical roller bearing sized 105×190×36 mm — a dimension series 2 (light-section ISO 15 envelope), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. The N configuration means two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part; functionally the bearing is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Selection arithmetic: C0/C ≈ 1.05 (315 against 300 kN), and the Pu figure 36.5 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 3,800 r/min thermal reference speed and 4,300 r/min mechanical limiting speed. Fit practice for N221-ECP: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "heavy gearbox and pinion shafts", "large pump and blower rotors", "rolling-mill auxiliary drive shafts", "paper-machine press rolls" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Do not use a N bearing where axial load must be carried — the design carries radial load only", "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 221, but flange configuration and axial-locating behaviour differ — quote the full SKF N 221 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 190 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 190 mm raceway.", "The 300/315 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of N221-ECP?", "a": "SKF N 221 ECP is a single-row caged cylindrical roller bearing with 105 mm bore, 190 mm OD and 36 mm width per ISO 15. SKF lists C 300 kN, C0 315 kN, Pu 36.5 kN, reference speed 3,800 r/min and limiting speed 4,300 r/min, mass about 3900 g." }, { "q": "What does the N designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part." }, { "q": "Can N221-ECP take axial load and locate the shaft?", "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing." }, { "q": "How does N221-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "N221", "equiv_brand": "NTN", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NJ221-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 105×190×36 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU221-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 105×190×36 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP221-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 105×190×36 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "N221-ECP", "SKF N 221 ECP" ], "locale_variants": {} }, { "sku": "N222-ECP", "brand": "SKF", "manufacturer_designation": "SKF N 222 ECP", "series": "N200-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 200, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 335, "static_load_kN": 365, "fatigue_load_limit_kN": 42.5, "max_rpm": 4000, "reference_speed_rpm": 3600, "limiting_speed_rpm": 4000, "weight_g": 4800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF N 222 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 110×200×38 mm envelope, dimension series 2 (light-section ISO 15 envelope), with catalogue mass 4800 g. Reading the N prefix: two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. This makes the execution non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The radial section height is 45.0 mm and the catalogue mass 4800 g; at 335 kN dynamic rating this is roughly 3.05 kN of C per millimetre of bore before application factors. Mounting: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. A 110 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "large pump and blower rotors", "rolling-mill auxiliary drive shafts", "paper-machine press rolls", "cement-plant conveyor drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Do not use a N bearing where axial load must be carried — the design carries radial load only", "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 222, but flange configuration and axial-locating behaviour differ — quote the full SKF N 222 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 38 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 200 mm raceway.", "The 335/365 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of N222-ECP?", "a": "SKF N 222 ECP is a single-row caged cylindrical roller bearing with 110 mm bore, 200 mm OD and 38 mm width per ISO 15. SKF lists C 335 kN, C0 365 kN, Pu 42.5 kN, reference speed 3,600 r/min and limiting speed 4,000 r/min, mass about 4800 g." }, { "q": "What does the N designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part." }, { "q": "Can N222-ECP take axial load and locate the shaft?", "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing." }, { "q": "How does N222-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "N222", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NJ222-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 110×200×38 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU222-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 110×200×38 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP222-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 110×200×38 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "N222-ECP", "SKF N 222 ECP" ], "locale_variants": {} }, { "sku": "N224-ECP", "brand": "SKF", "manufacturer_designation": "SKF N 224 ECP", "series": "N200-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 215, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 390, "static_load_kN": 430, "fatigue_load_limit_kN": 49, "max_rpm": 3600, "reference_speed_rpm": 3400, "limiting_speed_rpm": 3600, "weight_g": 5750, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF N 224 ECP resolves to a 120×215×40 mm single-row caged cylindrical roller bearing (dimension series 2 (light-section ISO 15 envelope)); two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. The N configuration means two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part; functionally the bearing is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Speed planning for N224-ECP: the catalogue lists 3,400 r/min thermal reference speed and 3,600 r/min mechanical limiting speed. The mass entry 5750 g covers the complete catalogue execution. Mounting: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. A 120 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "mining hoist and winder shafts", "offshore drawworks shafts", "large rolling-mill drive trains", "marine propulsion line shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Do not use a N bearing where axial load must be carried — the design carries radial load only", "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 224, but flange configuration and axial-locating behaviour differ — quote the full SKF N 224 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 215 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 215 mm raceway.", "The 390/430 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of N224-ECP?", "a": "SKF N 224 ECP is a single-row caged cylindrical roller bearing with 120 mm bore, 215 mm OD and 40 mm width per ISO 15. SKF lists C 390 kN, C0 430 kN, Pu 49 kN, reference speed 3,400 r/min and limiting speed 3,600 r/min, mass about 5750 g." }, { "q": "What does the N designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part." }, { "q": "Can N224-ECP take axial load and locate the shaft?", "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing." }, { "q": "How does N224-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "N224", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NJ224-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 120×215×40 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU224-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 120×215×40 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP224-ECJ", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 120×215×40 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "N224-ECP", "SKF N 224 ECP" ], "locale_variants": {} }, { "sku": "N226-ECP", "brand": "SKF", "manufacturer_designation": "SKF N 226 ECP", "series": "N200-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 230, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 415, "static_load_kN": 455, "fatigue_load_limit_kN": 51, "max_rpm": 3400, "reference_speed_rpm": 3200, "limiting_speed_rpm": 3400, "weight_g": 6450, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N226-ECP is the 130 mm bore entry in the N200 range: a 130×230×40 mm single-row caged cylindrical roller bearing with a glass-fibre reinforced polyamide (PA66) window-type cage, rated C 415 kN / C0 455 kN. Structurally, the N design has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. In arrangement terms it is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Selection arithmetic: C0/C ≈ 1.10 (455 against 415 kN), and the Pu figure 51 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 3,200 r/min thermal reference speed and 3,400 r/min mechanical limiting speed. Mounting: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. A 130 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "large rolling-mill drive trains", "marine propulsion line shafts", "heavy turbogenerator rotor supports", "mining hoist and winder shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "Do not use a N bearing where axial load must be carried — the design carries radial load only", "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 226, but flange configuration and axial-locating behaviour differ — quote the full SKF N 226 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 230 mm raceway.", "The 415/455 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of N226-ECP?", "a": "SKF N 226 ECP is a single-row caged cylindrical roller bearing with 130 mm bore, 230 mm OD and 40 mm width per ISO 15. SKF lists C 415 kN, C0 455 kN, Pu 51 kN, reference speed 3,200 r/min and limiting speed 3,400 r/min, mass about 6450 g." }, { "q": "What does the N designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part." }, { "q": "Can N226-ECP take axial load and locate the shaft?", "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing." }, { "q": "How does N226-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "N226", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NJ226-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 130×230×40 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU226-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 130×230×40 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP226-ECJ", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 130×230×40 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "N226-ECP", "SKF N 226 ECP" ], "locale_variants": {} }, { "sku": "N303-ECP", "brand": "SKF", "manufacturer_designation": "SKF N 303 ECP", "series": "N300-series", "type": "cylindrical_roller", "d_mm": 17, "D_mm": 47, "B_mm": 14, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 28.5, "static_load_kN": 20.4, "fatigue_load_limit_kN": 2.55, "max_rpm": 20000, "reference_speed_rpm": 17000, "limiting_speed_rpm": 20000, "weight_g": 120, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N303-ECP is the 17 mm bore entry in the N300 range: a 17×47×14 mm single-row caged cylindrical roller bearing with a glass-fibre reinforced polyamide (PA66) window-type cage, rated C 28.5 kN / C0 20.4 kN. Reading the N prefix: two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. This makes the execution non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. With C 28.5 kN and C0 20.4 kN, size the bearing on the 17×47 mm ISO 15 envelope and check the 2.55 kN Pu against the equivalent-load floor; the catalogue lists 17,000 r/min thermal reference speed and 20,000 r/min mechanical limiting speed. Fit practice for N303-ECP: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "motor-cycle and small-engine transmissions", "appliance and fan armature shafts", "small pump rotor shafts", "small industrial electric-motor shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Do not use a N bearing where axial load must be carried — the design carries radial load only", "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 303, but flange configuration and axial-locating behaviour differ — quote the full SKF N 303 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 14 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 14 mm-wide ring and concentrates load.", "The 28.5/20.4 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of N303-ECP?", "a": "SKF N 303 ECP is a single-row caged cylindrical roller bearing with 17 mm bore, 47 mm OD and 14 mm width per ISO 15. SKF lists C 28.5 kN, C0 20.4 kN, Pu 2.55 kN, reference speed 17,000 r/min and limiting speed 20,000 r/min, mass about 120 g." }, { "q": "What does the N designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part." }, { "q": "Can N303-ECP take axial load and locate the shaft?", "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing." }, { "q": "How does N303-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ303-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 17×47×14 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU303-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 17×47×14 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "N303-ECP", "SKF N 303 ECP" ], "locale_variants": {} }, { "sku": "N304-ECP", "brand": "SKF", "manufacturer_designation": "SKF N 304 ECP", "series": "N300-series", "type": "cylindrical_roller", "d_mm": 20, "D_mm": 52, "B_mm": 15, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 35.5, "static_load_kN": 26, "fatigue_load_limit_kN": 3.25, "max_rpm": 18000, "reference_speed_rpm": 15000, "limiting_speed_rpm": 18000, "weight_g": 150, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N304-ECP is the 20 mm bore entry in the N300 range: a 20×52×15 mm single-row caged cylindrical roller bearing with a glass-fibre reinforced polyamide (PA66) window-type cage, rated C 35.5 kN / C0 26 kN. Structurally, the N design has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. In arrangement terms it is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Speed planning for N304-ECP: the catalogue lists 15,000 r/min thermal reference speed and 18,000 r/min mechanical limiting speed. The mass entry 150 g covers the complete catalogue execution. Assembly note: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.", "applications": [ "appliance and fan armature shafts", "small pump rotor shafts", "small industrial electric-motor shafts", "light gearbox layshafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "Do not use a N bearing where axial load must be carried — the design carries radial load only", "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 304, but flange configuration and axial-locating behaviour differ — quote the full SKF N 304 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 15 mm-wide ring and concentrates load.", "The 35.5/26 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of N304-ECP?", "a": "SKF N 304 ECP is a single-row caged cylindrical roller bearing with 20 mm bore, 52 mm OD and 15 mm width per ISO 15. SKF lists C 35.5 kN, C0 26 kN, Pu 3.25 kN, reference speed 15,000 r/min and limiting speed 18,000 r/min, mass about 150 g." }, { "q": "What does the N designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part." }, { "q": "Can N304-ECP take axial load and locate the shaft?", "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing." }, { "q": "How does N304-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ304-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 20×52×15 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP304-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 20×52×15 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU304", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 20×52×15 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "N304-ECP", "SKF N 304 ECP" ], "locale_variants": {} }, { "sku": "N305-ECP", "brand": "SKF", "manufacturer_designation": "SKF N 305 ECP", "series": "N300-series", "type": "cylindrical_roller", "d_mm": 25, "D_mm": 62, "B_mm": 17, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 46.5, "static_load_kN": 36.5, "fatigue_load_limit_kN": 4.55, "max_rpm": 15000, "reference_speed_rpm": 12000, "limiting_speed_rpm": 15000, "weight_g": 230, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 25 mm shaft, SKF lists N305-ECP as single-row caged cylindrical roller: 62 mm OD, 17 mm wide, Pu 4.55 kN, the catalogue lists 12,000 r/min thermal reference speed and 15,000 r/min mechanical limiting speed. The N configuration means two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part; functionally the bearing is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Load-per-bore for the 25 mm seat is about 1.86 kN/mm, typical of dimension series 3 (medium-section ISO 15 envelope); use C0 36.5 kN for static checks such as crane hook blocks standing under load. Fit practice for N305-ECP: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "small pump rotor shafts", "small industrial electric-motor shafts", "light gearbox layshafts", "motor-cycle and small-engine transmissions" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Do not use a N bearing where axial load must be carried — the design carries radial load only", "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 305, but flange configuration and axial-locating behaviour differ — quote the full SKF N 305 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 62 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 17 mm-wide ring and concentrates load.", "The 46.5/36.5 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of N305-ECP?", "a": "SKF N 305 ECP is a single-row caged cylindrical roller bearing with 25 mm bore, 62 mm OD and 17 mm width per ISO 15. SKF lists C 46.5 kN, C0 36.5 kN, Pu 4.55 kN, reference speed 12,000 r/min and limiting speed 15,000 r/min, mass about 230 g." }, { "q": "What does the N designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part." }, { "q": "Can N305-ECP take axial load and locate the shaft?", "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing." }, { "q": "How does N305-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ305-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 25×62×17 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP305-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 25×62×17 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU305", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 25×62×17 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "N305-ECP", "SKF N 305 ECP" ], "locale_variants": {} }, { "sku": "N306-ECP", "brand": "SKF", "manufacturer_designation": "SKF N 306 ECP", "series": "N300-series", "type": "cylindrical_roller", "d_mm": 30, "D_mm": 72, "B_mm": 19, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 58.5, "static_load_kN": 48, "fatigue_load_limit_kN": 6.2, "max_rpm": 12000, "reference_speed_rpm": 11000, "limiting_speed_rpm": 12000, "weight_g": 360, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 30 mm shaft, SKF lists N306-ECP as single-row caged cylindrical roller: 72 mm OD, 19 mm wide, Pu 6.2 kN, the catalogue lists 11,000 r/min thermal reference speed and 12,000 r/min mechanical limiting speed. Structurally, the N design has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. In arrangement terms it is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The radial section height is 21.0 mm and the catalogue mass 360 g; at 58.5 kN dynamic rating this is roughly 1.95 kN of C per millimetre of bore before application factors. Assembly note: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.", "applications": [ "electric-motor shafts in pumps and fans", "compressor crank and rotor shafts", "machine-tool radial spindle supports", "conveyor drive-pulley shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Do not use a N bearing where axial load must be carried — the design carries radial load only", "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 306, but flange configuration and axial-locating behaviour differ — quote the full SKF N 306 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 19 mm-wide ring and concentrates load.", "The 58.5/48 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of N306-ECP?", "a": "SKF N 306 ECP is a single-row caged cylindrical roller bearing with 30 mm bore, 72 mm OD and 19 mm width per ISO 15. SKF lists C 58.5 kN, C0 48 kN, Pu 6.2 kN, reference speed 11,000 r/min and limiting speed 12,000 r/min, mass about 360 g." }, { "q": "What does the N designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part." }, { "q": "Can N306-ECP take axial load and locate the shaft?", "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing." }, { "q": "How does N306-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ306-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 30×72×19 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP306-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 30×72×19 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU306", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 30×72×19 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "N306-ECP", "SKF N 306 ECP" ], "locale_variants": {} }, { "sku": "N307-ECP", "brand": "SKF", "manufacturer_designation": "SKF N 307 ECP", "series": "N300-series", "type": "cylindrical_roller", "d_mm": 35, "D_mm": 80, "B_mm": 21, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 75, "static_load_kN": 63, "fatigue_load_limit_kN": 8.15, "max_rpm": 11000, "reference_speed_rpm": 9500, "limiting_speed_rpm": 11000, "weight_g": 480, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF N 307 ECP is a single-row caged cylindrical roller bearing sized 35×80×21 mm — a dimension series 3 (medium-section ISO 15 envelope), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. The N configuration means two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part; functionally the bearing is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. With C 75 kN and C0 63 kN, size the bearing on the 35×80 mm ISO 15 envelope and check the 8.15 kN Pu against the equivalent-load floor; the catalogue lists 9,500 r/min thermal reference speed and 11,000 r/min mechanical limiting speed. Fit practice for N307-ECP: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "compressor crank and rotor shafts", "machine-tool radial spindle supports", "conveyor drive-pulley shafts", "medium industrial gearbox shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "Do not use a N bearing where axial load must be carried — the design carries radial load only", "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 307, but flange configuration and axial-locating behaviour differ — quote the full SKF N 307 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 80 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 21 mm-wide ring and concentrates load.", "The 75/63 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of N307-ECP?", "a": "SKF N 307 ECP is a single-row caged cylindrical roller bearing with 35 mm bore, 80 mm OD and 21 mm width per ISO 15. SKF lists C 75 kN, C0 63 kN, Pu 8.15 kN, reference speed 9,500 r/min and limiting speed 11,000 r/min, mass about 480 g." }, { "q": "What does the N designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part." }, { "q": "Can N307-ECP take axial load and locate the shaft?", "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing." }, { "q": "How does N307-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ307-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 35×80×21 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP307-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 35×80×21 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU307", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 35×80×21 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "N307-ECP", "SKF N 307 ECP" ], "locale_variants": {} }, { "sku": "N308-ECP", "brand": "SKF", "manufacturer_designation": "SKF N 308 ECP", "series": "N300-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 90, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 93, "static_load_kN": 78, "fatigue_load_limit_kN": 10.2, "max_rpm": 9500, "reference_speed_rpm": 8000, "limiting_speed_rpm": 9500, "weight_g": 650, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF N 308 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 40×90×23 mm envelope, dimension series 3 (medium-section ISO 15 envelope), with catalogue mass 650 g. Reading the N prefix: two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. This makes the execution non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. Speed planning for N308-ECP: the catalogue lists 8,000 r/min thermal reference speed and 9,500 r/min mechanical limiting speed. The mass entry 650 g covers the complete catalogue execution. Mounting: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. A 40 mm seat normally takes a k5 interference with an H7 housing bore when the inner ring rotates.", "applications": [ "machine-tool radial spindle supports", "conveyor drive-pulley shafts", "medium industrial gearbox shafts", "electric-motor shafts in pumps and fans" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Do not use a N bearing where axial load must be carried — the design carries radial load only", "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 308, but flange configuration and axial-locating behaviour differ — quote the full SKF N 308 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 23 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 23 mm-wide ring and concentrates load.", "The 93/78 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of N308-ECP?", "a": "SKF N 308 ECP is a single-row caged cylindrical roller bearing with 40 mm bore, 90 mm OD and 23 mm width per ISO 15. SKF lists C 93 kN, C0 78 kN, Pu 10.2 kN, reference speed 8,000 r/min and limiting speed 9,500 r/min, mass about 650 g." }, { "q": "What does the N designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part." }, { "q": "Can N308-ECP take axial load and locate the shaft?", "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing." }, { "q": "How does N308-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "N308", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NJ308-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 40×90×23 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP308-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 40×90×23 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU308", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 40×90×23 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "N308-ECP", "SKF N 308 ECP" ], "locale_variants": {} }, { "sku": "N309-ECP", "brand": "SKF", "manufacturer_designation": "SKF N 309 ECP", "series": "N300-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 100, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 112, "static_load_kN": 100, "fatigue_load_limit_kN": 12.9, "max_rpm": 8500, "reference_speed_rpm": 7500, "limiting_speed_rpm": 8500, "weight_g": 880, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF N 309 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 45×100×25 mm envelope, dimension series 3 (medium-section ISO 15 envelope), with catalogue mass 880 g. Structurally, the N design has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. In arrangement terms it is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Load-per-bore for the 45 mm seat is about 2.49 kN/mm, typical of dimension series 3 (medium-section ISO 15 envelope); use C0 100 kN for static checks such as crane hook blocks standing under load. Fit practice for N309-ECP: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "conveyor drive-pulley shafts", "medium industrial gearbox shafts", "electric-motor shafts in pumps and fans", "compressor crank and rotor shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Do not use a N bearing where axial load must be carried — the design carries radial load only", "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 309, but flange configuration and axial-locating behaviour differ — quote the full SKF N 309 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 25 mm-wide ring and concentrates load.", "The 112/100 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of N309-ECP?", "a": "SKF N 309 ECP is a single-row caged cylindrical roller bearing with 45 mm bore, 100 mm OD and 25 mm width per ISO 15. SKF lists C 112 kN, C0 100 kN, Pu 12.9 kN, reference speed 7,500 r/min and limiting speed 8,500 r/min, mass about 880 g." }, { "q": "What does the N designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part." }, { "q": "Can N309-ECP take axial load and locate the shaft?", "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing." }, { "q": "How does N309-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "N309", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NJ309-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 45×100×25 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP309-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 45×100×25 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU309", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 45×100×25 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "N309-ECP", "SKF N 309 ECP" ], "locale_variants": {} }, { "sku": "N310-ECP", "brand": "SKF", "manufacturer_designation": "SKF N 310 ECP", "series": "N300-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 110, "B_mm": 27, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 127, "static_load_kN": 112, "fatigue_load_limit_kN": 15, "max_rpm": 8000, "reference_speed_rpm": 6700, "limiting_speed_rpm": 8000, "weight_g": 1100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 50 mm shaft, SKF lists N310-ECP as single-row caged cylindrical roller: 110 mm OD, 27 mm wide, Pu 15 kN, the catalogue lists 6,700 r/min thermal reference speed and 8,000 r/min mechanical limiting speed. Reading the N prefix: two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. This makes the execution non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Selection arithmetic: C0/C ≈ 0.88 (112 against 127 kN), and the Pu figure 15 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 6,700 r/min thermal reference speed and 8,000 r/min mechanical limiting speed. Assembly note: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.", "applications": [ "medium industrial gearbox shafts", "electric-motor shafts in pumps and fans", "compressor crank and rotor shafts", "machine-tool radial spindle supports" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Do not use a N bearing where axial load must be carried — the design carries radial load only", "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 310, but flange configuration and axial-locating behaviour differ — quote the full SKF N 310 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 27 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 127/112 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of N310-ECP?", "a": "SKF N 310 ECP is a single-row caged cylindrical roller bearing with 50 mm bore, 110 mm OD and 27 mm width per ISO 15. SKF lists C 127 kN, C0 112 kN, Pu 15 kN, reference speed 6,700 r/min and limiting speed 8,000 r/min, mass about 1100 g." }, { "q": "What does the N designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part." }, { "q": "Can N310-ECP take axial load and locate the shaft?", "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing." }, { "q": "How does N310-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "N310", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NJ310-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 50×110×27 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP310-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 50×110×27 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU310", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 50×110×27 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "N310-ECP", "SKF N 310 ECP" ], "locale_variants": {} }, { "sku": "N311-ECP", "brand": "SKF", "manufacturer_designation": "SKF N 311 ECP", "series": "N300-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 120, "B_mm": 29, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 156, "static_load_kN": 143, "fatigue_load_limit_kN": 18.6, "max_rpm": 7000, "reference_speed_rpm": 6000, "limiting_speed_rpm": 7000, "weight_g": 1450, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF N 311 ECP is a single-row caged cylindrical roller bearing sized 55×120×29 mm — a dimension series 3 (medium-section ISO 15 envelope), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. Structurally, the N design has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. In arrangement terms it is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. The radial section height is 32.5 mm and the catalogue mass 1450 g; at 156 kN dynamic rating this is roughly 2.84 kN of C per millimetre of bore before application factors. Fit practice for N311-ECP: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "electric-motor shafts in pumps and fans", "compressor crank and rotor shafts", "machine-tool radial spindle supports", "conveyor drive-pulley shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Do not use a N bearing where axial load must be carried — the design carries radial load only", "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 311, but flange configuration and axial-locating behaviour differ — quote the full SKF N 311 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 156/143 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of N311-ECP?", "a": "SKF N 311 ECP is a single-row caged cylindrical roller bearing with 55 mm bore, 120 mm OD and 29 mm width per ISO 15. SKF lists C 156 kN, C0 143 kN, Pu 18.6 kN, reference speed 6,000 r/min and limiting speed 7,000 r/min, mass about 1450 g." }, { "q": "What does the N designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part." }, { "q": "Can N311-ECP take axial load and locate the shaft?", "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing." }, { "q": "How does N311-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "N311", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NJ311-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 55×120×29 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP311-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 55×120×29 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU311", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 55×120×29 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "N311-ECP", "SKF N 311 ECP" ], "locale_variants": {} }, { "sku": "N312-ECP", "brand": "SKF", "manufacturer_designation": "SKF N 312 ECP", "series": "N300-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 130, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 173, "static_load_kN": 160, "fatigue_load_limit_kN": 21.2, "max_rpm": 6700, "reference_speed_rpm": 5600, "limiting_speed_rpm": 6700, "weight_g": 1750, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF N 312 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 60×130×31 mm envelope, dimension series 3 (medium-section ISO 15 envelope), with catalogue mass 1750 g. The N configuration means two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part; functionally the bearing is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. With C 173 kN and C0 160 kN, size the bearing on the 60×130 mm ISO 15 envelope and check the 21.2 kN Pu against the equivalent-load floor; the catalogue lists 5,600 r/min thermal reference speed and 6,700 r/min mechanical limiting speed. Mounting: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. A 60 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "rolling-mill auxiliary drive shafts", "paper-machine press rolls", "cement-plant conveyor drives", "heavy gearbox and pinion shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "Do not use a N bearing where axial load must be carried — the design carries radial load only", "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 312, but flange configuration and axial-locating behaviour differ — quote the full SKF N 312 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 130 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 173/160 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of N312-ECP?", "a": "SKF N 312 ECP is a single-row caged cylindrical roller bearing with 60 mm bore, 130 mm OD and 31 mm width per ISO 15. SKF lists C 173 kN, C0 160 kN, Pu 21.2 kN, reference speed 5,600 r/min and limiting speed 6,700 r/min, mass about 1750 g." }, { "q": "What does the N designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part." }, { "q": "Can N312-ECP take axial load and locate the shaft?", "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing." }, { "q": "How does N312-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "N312", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NJ312-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 60×130×31 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP312-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 60×130×31 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU312", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 60×130×31 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "N312-ECP", "SKF N 312 ECP" ], "locale_variants": {} }, { "sku": "N313-ECP", "brand": "SKF", "manufacturer_designation": "SKF N 313 ECP", "series": "N300-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 140, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 212, "static_load_kN": 196, "fatigue_load_limit_kN": 25.5, "max_rpm": 6000, "reference_speed_rpm": 5300, "limiting_speed_rpm": 6000, "weight_g": 2200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF N 313 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 65×140×33 mm envelope, dimension series 3 (medium-section ISO 15 envelope), with catalogue mass 2200 g. Structurally, the N design has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. In arrangement terms it is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. Load-per-bore for the 65 mm seat is about 3.26 kN/mm, typical of dimension series 3 (medium-section ISO 15 envelope); use C0 196 kN for static checks such as crane hook blocks standing under load. Fit practice for N313-ECP: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "cement-plant conveyor drives", "heavy gearbox and pinion shafts", "large pump and blower rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Do not use a N bearing where axial load must be carried — the design carries radial load only", "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 313, but flange configuration and axial-locating behaviour differ — quote the full SKF N 313 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 212/196 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of N313-ECP?", "a": "SKF N 313 ECP is a single-row caged cylindrical roller bearing with 65 mm bore, 140 mm OD and 33 mm width per ISO 15. SKF lists C 212 kN, C0 196 kN, Pu 25.5 kN, reference speed 5,300 r/min and limiting speed 6,000 r/min, mass about 2200 g." }, { "q": "What does the N designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part." }, { "q": "Can N313-ECP take axial load and locate the shaft?", "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing." }, { "q": "How does N313-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "N313", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NJ313-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 65×140×33 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP313-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 65×140×33 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU313", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 65×140×33 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "N313-ECP", "SKF N 313 ECP" ], "locale_variants": {} }, { "sku": "N314-ECP", "brand": "SKF", "manufacturer_designation": "SKF N 314 ECP", "series": "N300-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 150, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 236, "static_load_kN": 228, "fatigue_load_limit_kN": 29, "max_rpm": 5600, "reference_speed_rpm": 4800, "limiting_speed_rpm": 5600, "weight_g": 2650, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF N 314 ECP resolves to a 70×150×35 mm single-row caged cylindrical roller bearing (dimension series 3 (medium-section ISO 15 envelope)); two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. The N configuration means two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part; functionally the bearing is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Selection arithmetic: C0/C ≈ 0.97 (228 against 236 kN), and the Pu figure 29 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 4,800 r/min thermal reference speed and 5,600 r/min mechanical limiting speed. Mounting: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. A 70 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "heavy gearbox and pinion shafts", "large pump and blower rotors", "rolling-mill auxiliary drive shafts", "paper-machine press rolls" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Do not use a N bearing where axial load must be carried — the design carries radial load only", "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 314, but flange configuration and axial-locating behaviour differ — quote the full SKF N 314 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 150 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 236/228 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of N314-ECP?", "a": "SKF N 314 ECP is a single-row caged cylindrical roller bearing with 70 mm bore, 150 mm OD and 35 mm width per ISO 15. SKF lists C 236 kN, C0 228 kN, Pu 29 kN, reference speed 4,800 r/min and limiting speed 5,600 r/min, mass about 2650 g." }, { "q": "What does the N designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part." }, { "q": "Can N314-ECP take axial load and locate the shaft?", "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing." }, { "q": "How does N314-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "N314", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NJ314-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 70×150×35 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP314-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 70×150×35 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU314", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 70×150×35 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "N314-ECP", "SKF N 314 ECP" ], "locale_variants": {} }, { "sku": "N315-ECP", "brand": "SKF", "manufacturer_designation": "SKF N 315 ECP", "series": "N300-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 160, "B_mm": 37, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 280, "static_load_kN": 265, "fatigue_load_limit_kN": 33.5, "max_rpm": 5300, "reference_speed_rpm": 4500, "limiting_speed_rpm": 5300, "weight_g": 3300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF N 315 ECP resolves to a 75×160×37 mm single-row caged cylindrical roller bearing (dimension series 3 (medium-section ISO 15 envelope)); two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. Reading the N prefix: two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. This makes the execution non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Selection arithmetic: C0/C ≈ 0.95 (265 against 280 kN), and the Pu figure 33.5 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 4,500 r/min thermal reference speed and 5,300 r/min mechanical limiting speed. Mounting: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. A 75 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "heavy gearbox and pinion shafts", "large pump and blower rotors", "rolling-mill auxiliary drive shafts", "paper-machine press rolls" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Do not use a N bearing where axial load must be carried — the design carries radial load only", "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 315, but flange configuration and axial-locating behaviour differ — quote the full SKF N 315 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 37 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 160 mm raceway.", "The 280/265 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of N315-ECP?", "a": "SKF N 315 ECP is a single-row caged cylindrical roller bearing with 75 mm bore, 160 mm OD and 37 mm width per ISO 15. SKF lists C 280 kN, C0 265 kN, Pu 33.5 kN, reference speed 4,500 r/min and limiting speed 5,300 r/min, mass about 3300 g." }, { "q": "What does the N designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part." }, { "q": "Can N315-ECP take axial load and locate the shaft?", "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing." }, { "q": "How does N315-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "N315", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NJ315-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 75×160×37 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP315-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 75×160×37 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU315", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 75×160×37 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "N315-ECP", "SKF N 315 ECP" ], "locale_variants": {} }, { "sku": "N316-ECP", "brand": "SKF", "manufacturer_designation": "SKF N 316 ECP", "series": "N300-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 170, "B_mm": 39, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 300, "static_load_kN": 290, "fatigue_load_limit_kN": 36, "max_rpm": 5000, "reference_speed_rpm": 4300, "limiting_speed_rpm": 5000, "weight_g": 3900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N316-ECP is the 80 mm bore entry in the N300 range: a 80×170×39 mm single-row caged cylindrical roller bearing with a glass-fibre reinforced polyamide (PA66) window-type cage, rated C 300 kN / C0 290 kN. Structurally, the N design has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. In arrangement terms it is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. The radial section height is 45.0 mm and the catalogue mass 3900 g; at 300 kN dynamic rating this is roughly 3.75 kN of C per millimetre of bore before application factors. Assembly note: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.", "applications": [ "large pump and blower rotors", "rolling-mill auxiliary drive shafts", "paper-machine press rolls", "cement-plant conveyor drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Do not use a N bearing where axial load must be carried — the design carries radial load only", "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 316, but flange configuration and axial-locating behaviour differ — quote the full SKF N 316 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 170 mm raceway.", "The 300/290 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of N316-ECP?", "a": "SKF N 316 ECP is a single-row caged cylindrical roller bearing with 80 mm bore, 170 mm OD and 39 mm width per ISO 15. SKF lists C 300 kN, C0 290 kN, Pu 36 kN, reference speed 4,300 r/min and limiting speed 5,000 r/min, mass about 3900 g." }, { "q": "What does the N designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part." }, { "q": "Can N316-ECP take axial load and locate the shaft?", "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing." }, { "q": "How does N316-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "N316", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NJ316-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 80×170×39 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP316-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 80×170×39 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU316", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 80×170×39 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "N316-ECP", "SKF N 316 ECP" ], "locale_variants": {} }, { "sku": "N317-ECP", "brand": "SKF", "manufacturer_designation": "SKF N 317 ECP", "series": "N300-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 180, "B_mm": 41, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 340, "static_load_kN": 335, "fatigue_load_limit_kN": 41.5, "max_rpm": 4800, "reference_speed_rpm": 4000, "limiting_speed_rpm": 4800, "weight_g": 4550, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 85 mm shaft, SKF lists N317-ECP as single-row caged cylindrical roller: 180 mm OD, 41 mm wide, Pu 41.5 kN, the catalogue lists 4,000 r/min thermal reference speed and 4,800 r/min mechanical limiting speed. The N configuration means two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part; functionally the bearing is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. With C 340 kN and C0 335 kN, size the bearing on the 85×180 mm ISO 15 envelope and check the 41.5 kN Pu against the equivalent-load floor; the catalogue lists 4,000 r/min thermal reference speed and 4,800 r/min mechanical limiting speed. Fit practice for N317-ECP: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "rolling-mill auxiliary drive shafts", "paper-machine press rolls", "cement-plant conveyor drives", "heavy gearbox and pinion shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "Do not use a N bearing where axial load must be carried — the design carries radial load only", "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 317, but flange configuration and axial-locating behaviour differ — quote the full SKF N 317 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 180 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 180 mm raceway.", "The 340/335 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of N317-ECP?", "a": "SKF N 317 ECP is a single-row caged cylindrical roller bearing with 85 mm bore, 180 mm OD and 41 mm width per ISO 15. SKF lists C 340 kN, C0 335 kN, Pu 41.5 kN, reference speed 4,000 r/min and limiting speed 4,800 r/min, mass about 4550 g." }, { "q": "What does the N designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part." }, { "q": "Can N317-ECP take axial load and locate the shaft?", "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing." }, { "q": "How does N317-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "N317", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NJ317-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 85×180×41 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP317-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 85×180×41 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU317", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 85×180×41 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "N317-ECP", "SKF N 317 ECP" ], "locale_variants": {} }, { "sku": "N318-ECP", "brand": "SKF", "manufacturer_designation": "SKF N 318 ECP", "series": "N300-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 190, "B_mm": 43, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 365, "static_load_kN": 360, "fatigue_load_limit_kN": 43, "max_rpm": 4500, "reference_speed_rpm": 3800, "limiting_speed_rpm": 4500, "weight_g": 5300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 90 mm shaft, SKF lists N318-ECP as single-row caged cylindrical roller: 190 mm OD, 43 mm wide, Pu 43 kN, the catalogue lists 3,800 r/min thermal reference speed and 4,500 r/min mechanical limiting speed. Reading the N prefix: two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. This makes the execution non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. Speed planning for N318-ECP: the catalogue lists 3,800 r/min thermal reference speed and 4,500 r/min mechanical limiting speed. The mass entry 5300 g covers the complete catalogue execution. Assembly note: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.", "applications": [ "paper-machine press rolls", "cement-plant conveyor drives", "heavy gearbox and pinion shafts", "large pump and blower rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Do not use a N bearing where axial load must be carried — the design carries radial load only", "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 318, but flange configuration and axial-locating behaviour differ — quote the full SKF N 318 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 43 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 190 mm raceway.", "The 365/360 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of N318-ECP?", "a": "SKF N 318 ECP is a single-row caged cylindrical roller bearing with 90 mm bore, 190 mm OD and 43 mm width per ISO 15. SKF lists C 365 kN, C0 360 kN, Pu 43 kN, reference speed 3,800 r/min and limiting speed 4,500 r/min, mass about 5300 g." }, { "q": "What does the N designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part." }, { "q": "Can N318-ECP take axial load and locate the shaft?", "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing." }, { "q": "How does N318-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "N318", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NJ318-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 90×190×43 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP318-ECJ", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 90×190×43 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU318", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 90×190×43 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "N318-ECP", "SKF N 318 ECP" ], "locale_variants": {} }, { "sku": "N319-ECP", "brand": "SKF", "manufacturer_designation": "SKF N 319 ECP", "series": "N300-series", "type": "cylindrical_roller", "d_mm": 95, "D_mm": 200, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 390, "static_load_kN": 390, "fatigue_load_limit_kN": 46.5, "max_rpm": 4300, "reference_speed_rpm": 3600, "limiting_speed_rpm": 4300, "weight_g": 6200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF N 319 ECP is a single-row caged cylindrical roller bearing sized 95×200×45 mm — a dimension series 3 (medium-section ISO 15 envelope), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. The N configuration means two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part; functionally the bearing is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Selection arithmetic: C0/C ≈ 1.00 (390 against 390 kN), and the Pu figure 46.5 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 3,600 r/min thermal reference speed and 4,300 r/min mechanical limiting speed. Fit practice for N319-ECP: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "heavy gearbox and pinion shafts", "large pump and blower rotors", "rolling-mill auxiliary drive shafts", "paper-machine press rolls" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Do not use a N bearing where axial load must be carried — the design carries radial load only", "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 319, but flange configuration and axial-locating behaviour differ — quote the full SKF N 319 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 200 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 200 mm raceway.", "The 390/390 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of N319-ECP?", "a": "SKF N 319 ECP is a single-row caged cylindrical roller bearing with 95 mm bore, 200 mm OD and 45 mm width per ISO 15. SKF lists C 390 kN, C0 390 kN, Pu 46.5 kN, reference speed 3,600 r/min and limiting speed 4,300 r/min, mass about 6200 g." }, { "q": "What does the N designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part." }, { "q": "Can N319-ECP take axial load and locate the shaft?", "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing." }, { "q": "How does N319-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "N319", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NJ319-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 95×200×45 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP319-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 95×200×45 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU319", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 95×200×45 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "N319-ECP", "SKF N 319 ECP" ], "locale_variants": {} }, { "sku": "N320-ECP", "brand": "SKF", "manufacturer_designation": "SKF N 320 ECP", "series": "N300-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 215, "B_mm": 47, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 450, "static_load_kN": 440, "fatigue_load_limit_kN": 51, "max_rpm": 3800, "reference_speed_rpm": 3200, "limiting_speed_rpm": 3800, "weight_g": 7350, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N320-ECP is the 100 mm bore entry in the N300 range: a 100×215×47 mm single-row caged cylindrical roller bearing with a glass-fibre reinforced polyamide (PA66) window-type cage, rated C 450 kN / C0 440 kN. Structurally, the N design has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. In arrangement terms it is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The radial section height is 57.5 mm and the catalogue mass 7350 g; at 450 kN dynamic rating this is roughly 4.50 kN of C per millimetre of bore before application factors. Assembly note: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.", "applications": [ "large pump and blower rotors", "rolling-mill auxiliary drive shafts", "paper-machine press rolls", "cement-plant conveyor drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Do not use a N bearing where axial load must be carried — the design carries radial load only", "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 320, but flange configuration and axial-locating behaviour differ — quote the full SKF N 320 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 47 mm-wide ring and concentrates load.", "The 450/440 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of N320-ECP?", "a": "SKF N 320 ECP is a single-row caged cylindrical roller bearing with 100 mm bore, 215 mm OD and 47 mm width per ISO 15. SKF lists C 450 kN, C0 440 kN, Pu 51 kN, reference speed 3,200 r/min and limiting speed 3,800 r/min, mass about 7350 g." }, { "q": "What does the N designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part." }, { "q": "Can N320-ECP take axial load and locate the shaft?", "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing." }, { "q": "How does N320-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "N320", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NJ320-ECJ", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 100×215×47 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP320-ECJ", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 100×215×47 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU320", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 100×215×47 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "N320-ECP", "SKF N 320 ECP" ], "locale_variants": {} }, { "sku": "N321-ECP", "brand": "SKF", "manufacturer_designation": "SKF N 321 ECP", "series": "N300-series", "type": "cylindrical_roller", "d_mm": 105, "D_mm": 225, "B_mm": 49, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 500, "static_load_kN": 500, "fatigue_load_limit_kN": 57, "max_rpm": 3800, "reference_speed_rpm": 3200, "limiting_speed_rpm": 3800, "weight_g": 8600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 105 mm shaft, SKF lists N321-ECP as single-row caged cylindrical roller: 225 mm OD, 49 mm wide, Pu 57 kN, the catalogue lists 3,200 r/min thermal reference speed and 3,800 r/min mechanical limiting speed. The N configuration means two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part; functionally the bearing is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. With C 500 kN and C0 500 kN, size the bearing on the 105×225 mm ISO 15 envelope and check the 57 kN Pu against the equivalent-load floor; the catalogue lists 3,200 r/min thermal reference speed and 3,800 r/min mechanical limiting speed. Fit practice for N321-ECP: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "rolling-mill auxiliary drive shafts", "paper-machine press rolls", "cement-plant conveyor drives", "heavy gearbox and pinion shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Do not use a N bearing where axial load must be carried — the design carries radial load only", "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 321, but flange configuration and axial-locating behaviour differ — quote the full SKF N 321 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 225 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 49 mm-wide ring and concentrates load.", "The 500/500 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of N321-ECP?", "a": "SKF N 321 ECP is a single-row caged cylindrical roller bearing with 105 mm bore, 225 mm OD and 49 mm width per ISO 15. SKF lists C 500 kN, C0 500 kN, Pu 57 kN, reference speed 3,200 r/min and limiting speed 3,800 r/min, mass about 8600 g." }, { "q": "What does the N designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part." }, { "q": "Can N321-ECP take axial load and locate the shaft?", "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing." }, { "q": "How does N321-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "N321", "equiv_brand": "NTN", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NJ321-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 105×225×49 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU321-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 105×225×49 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "N321-ECP", "SKF N 321 ECP" ], "locale_variants": {} }, { "sku": "N322-ECP", "brand": "SKF", "manufacturer_designation": "SKF N 322 ECP", "series": "N300-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 240, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 530, "static_load_kN": 540, "fatigue_load_limit_kN": 61, "max_rpm": 3400, "reference_speed_rpm": 3000, "limiting_speed_rpm": 3400, "weight_g": 10000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 110 mm shaft, SKF lists N322-ECP as single-row caged cylindrical roller: 240 mm OD, 50 mm wide, Pu 61 kN, the catalogue lists 3,000 r/min thermal reference speed and 3,400 r/min mechanical limiting speed. Reading the N prefix: two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part. This makes the execution non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Speed planning for N322-ECP: the catalogue lists 3,000 r/min thermal reference speed and 3,400 r/min mechanical limiting speed. The mass entry 10000 g covers the complete catalogue execution. Assembly note: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.", "applications": [ "paper-machine press rolls", "cement-plant conveyor drives", "heavy gearbox and pinion shafts", "large pump and blower rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Do not use a N bearing where axial load must be carried — the design carries radial load only", "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 322, but flange configuration and axial-locating behaviour differ — quote the full SKF N 322 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 50 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 50 mm-wide ring and concentrates load.", "The 530/540 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of N322-ECP?", "a": "SKF N 322 ECP is a single-row caged cylindrical roller bearing with 110 mm bore, 240 mm OD and 50 mm width per ISO 15. SKF lists C 530 kN, C0 540 kN, Pu 61 kN, reference speed 3,000 r/min and limiting speed 3,400 r/min, mass about 10000 g." }, { "q": "What does the N designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part." }, { "q": "Can N322-ECP take axial load and locate the shaft?", "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing." }, { "q": "How does N322-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "N322", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×240×50 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NJ322-ECJ", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 110×240×50 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU322-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 110×240×50 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP322-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 110×240×50 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "N322-ECP", "SKF N 322 ECP" ], "locale_variants": {} }, { "sku": "N324-ECP", "brand": "SKF", "manufacturer_designation": "SKF N 324 ECP", "series": "N300-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 260, "B_mm": 55, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 610, "static_load_kN": 620, "fatigue_load_limit_kN": 69.5, "max_rpm": 3200, "reference_speed_rpm": 2800, "limiting_speed_rpm": 3200, "weight_g": 13000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF N 324 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 120×260×55 mm envelope, dimension series 3 (medium-section ISO 15 envelope), with catalogue mass 13000 g. The N configuration means two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part; functionally the bearing is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 1.02 (620 against 610 kN), and the Pu figure 69.5 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 2,800 r/min thermal reference speed and 3,200 r/min mechanical limiting speed. Mounting: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. A 120 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "large rolling-mill drive trains", "marine propulsion line shafts", "heavy turbogenerator rotor supports", "mining hoist and winder shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Do not use a N bearing where axial load must be carried — the design carries radial load only", "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 324, but flange configuration and axial-locating behaviour differ — quote the full SKF N 324 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 260 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 55 mm-wide ring and concentrates load.", "The 610/620 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of N324-ECP?", "a": "SKF N 324 ECP is a single-row caged cylindrical roller bearing with 120 mm bore, 260 mm OD and 55 mm width per ISO 15. SKF lists C 610 kN, C0 620 kN, Pu 69.5 kN, reference speed 2,800 r/min and limiting speed 3,200 r/min, mass about 13000 g." }, { "q": "What does the N designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part." }, { "q": "Can N324-ECP take axial load and locate the shaft?", "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing." }, { "q": "How does N324-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "N324", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NJ324-ECJ", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 120×260×55 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU324-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 120×260×55 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP324-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 120×260×55 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "N324-ECP", "SKF N 324 ECP" ], "locale_variants": {} }, { "sku": "N326-ECM", "brand": "SKF", "manufacturer_designation": "SKF N 326 ECM", "series": "N300-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 280, "B_mm": 58, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 720, "static_load_kN": 750, "fatigue_load_limit_kN": 81.5, "max_rpm": 3000, "reference_speed_rpm": 2400, "limiting_speed_rpm": 3000, "weight_g": 18000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "N326-ECM is the 130 mm bore entry in the N300 range: a 130×280×58 mm single-row caged cylindrical roller bearing with a one-piece machined brass cage, rated C 720 kN / C0 750 kN. The N configuration means two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part; functionally the bearing is non-locating: the outer ring can displace axially in both directions and the bearing carries radial load only. The ECM suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. The one-piece machined brass cage is reflected in the published speeds and temperature limits. Speed planning for N326-ECM: the catalogue lists 2,400 r/min thermal reference speed and 3,000 r/min mechanical limiting speed. The mass entry 18000 g covers the complete catalogue execution. Mounting: the outer ring slides in its housing seat; provide axial retention for the outer ring only if the application requires it, and let it float to absorb shaft expansion. A 130 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "mining hoist and winder shafts", "offshore drawworks shafts", "large rolling-mill drive trains", "marine propulsion line shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Do not use a N bearing where axial load must be carried — the design carries radial load only", "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 326, but flange configuration and axial-locating behaviour differ — quote the full SKF N 326 ECM and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 280 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 58 mm-wide ring and concentrates load.", "The 720/750 kN ratings are SKF catalogue 17000 (2018) values for the ECM execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of N326-ECM?", "a": "SKF N 326 ECM is a single-row caged cylindrical roller bearing with 130 mm bore, 280 mm OD and 58 mm width per ISO 15. SKF lists C 720 kN, C0 750 kN, Pu 81.5 kN, reference speed 2,400 r/min and limiting speed 3,000 r/min, mass about 18000 g." }, { "q": "What does the N designation and ECM suffix mean?", "a": "The ECM suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring, so the plain outer ring is the separable part." }, { "q": "Can N326-ECM take axial load and locate the shaft?", "a": "No — the plain outer ring has no flanges, so the N bearing floats axially and is for radial load; locate the shaft with a separate bearing." }, { "q": "How does N326-ECM compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "N326", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×280×58 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NJ326-ECJ", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 130×280×58 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU326-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 130×280×58 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP326-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 130×280×58 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "N326-ECM", "SKF N 326 ECM" ], "locale_variants": {} }, { "sku": "NCF18-500-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 18/500 V", "series": "NCF1800-series", "type": "cylindrical_roller", "d_mm": 500, "D_mm": 620, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 952, "static_load_kN": 2120, "fatigue_load_limit_kN": 173, "max_rpm": 480, "reference_speed_rpm": 380, "limiting_speed_rpm": 480, "weight_g": 35500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 500 mm shaft, SKF lists NCF18-500-V as single-row full-complement cylindrical roller: 620 mm OD, 56 mm wide, Pu 173 kN, the catalogue lists 380 r/min thermal reference speed and 480 r/min mechanical limiting speed. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix V: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. With C 952 kN and C0 2120 kN, size the bearing on the 500×620 mm ISO 15 envelope and check the 173 kN Pu against the equivalent-load floor; the catalogue lists 380 r/min thermal reference speed and 480 r/min mechanical limiting speed. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 500 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "heavy offshore winch drums", "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 480 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 620 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 952/2120 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF18-500-V?", "a": "SKF NCF 18/500 V is a single-row full-complement cylindrical roller bearing with 500 mm bore, 620 mm OD and 56 mm width per ISO 15. SKF lists C 952 kN, C0 2120 kN, Pu 173 kN, reference speed 380 r/min and limiting speed 480 r/min, mass about 35500 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF18-500-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF18-500-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF18", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF18-500-V", "SKF NCF 18/500 V" ], "locale_variants": {} }, { "sku": "NCF18-530-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 18/530 V", "series": "NCF1800-series", "type": "cylindrical_roller", "d_mm": 530, "D_mm": 650, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 990, "static_load_kN": 2240, "fatigue_load_limit_kN": 180, "max_rpm": 450, "reference_speed_rpm": 360, "limiting_speed_rpm": 450, "weight_g": 38500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NCF 18/530 V resolves to a 530×650×56 mm single-row full-complement cylindrical roller bearing (dimension series 18 (ultra-slim section for large shafts)); a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 530 mm seat is about 1.87 kN/mm, typical of dimension series 18 (ultra-slim section for large shafts); use C0 2240 kN for static checks such as crane hook blocks standing under load. Fit practice for NCF18-530-V: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts", "heavy offshore winch drums" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 450 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 650 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 56 mm-wide ring and concentrates load.", "The 990/2240 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF18-530-V?", "a": "SKF NCF 18/530 V is a single-row full-complement cylindrical roller bearing with 530 mm bore, 650 mm OD and 56 mm width per ISO 15. SKF lists C 990 kN, C0 2240 kN, Pu 180 kN, reference speed 360 r/min and limiting speed 450 r/min, mass about 38500 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF18-530-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF18-530-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF18", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF18-530-V", "SKF NCF 18/530 V" ], "locale_variants": {} }, { "sku": "NCF18-560-V-HB1", "brand": "SKF", "manufacturer_designation": "SKF NCF 18/560 V/HB1", "series": "NCF1800-series", "type": "cylindrical_roller", "d_mm": 560, "D_mm": 680, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1020, "static_load_kN": 2360, "fatigue_load_limit_kN": 186, "max_rpm": 430, "reference_speed_rpm": 340, "limiting_speed_rpm": 430, "weight_g": 39000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 560 mm shaft, SKF lists NCF18-560-V-HB1 as single-row full-complement cylindrical roller: 680 mm OD, 56 mm wide, Pu 186 kN, the catalogue lists 340 r/min thermal reference speed and 430 r/min mechanical limiting speed. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V/HB1 identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The radial section height is 60.0 mm and the catalogue mass 39000 g; at 1020 kN dynamic rating this is roughly 1.82 kN of C per millimetre of bore before application factors. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "heavy offshore winch drums", "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 430 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 680 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 1020/2360 kN ratings are SKF catalogue 17000 (2018) values for the V/HB1 execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF18-560-V-HB1?", "a": "SKF NCF 18/560 V/HB1 is a single-row full-complement cylindrical roller bearing with 560 mm bore, 680 mm OD and 56 mm width per ISO 15. SKF lists C 1020 kN, C0 2360 kN, Pu 186 kN, reference speed 340 r/min and limiting speed 430 r/min, mass about 39000 g." }, { "q": "What does the NCF designation and V/HB1 suffix mean?", "a": "Suffix V/HB1 identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF18-560-V-HB1 take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF18-560-V-HB1 compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF18", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF18-560-V-HB1", "SKF NCF 18/560 V/HB1" ], "locale_variants": {} }, { "sku": "NCF18-600-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 18/600 V", "series": "NCF1800-series", "type": "cylindrical_roller", "d_mm": 600, "D_mm": 730, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1050, "static_load_kN": 2550, "fatigue_load_limit_kN": 196, "max_rpm": 400, "reference_speed_rpm": 320, "limiting_speed_rpm": 400, "weight_g": 51500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 600 mm shaft, SKF lists NCF18-600-V as single-row full-complement cylindrical roller: 730 mm OD, 60 mm wide, Pu 196 kN, the catalogue lists 320 r/min thermal reference speed and 400 r/min mechanical limiting speed. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Speed planning for NCF18-600-V: the catalogue lists 320 r/min thermal reference speed and 400 r/min mechanical limiting speed. The mass entry 51500 g covers the complete catalogue execution. Fit practice for NCF18-600-V: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts", "heavy offshore winch drums" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 400 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 60 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 1050/2550 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF18-600-V?", "a": "SKF NCF 18/600 V is a single-row full-complement cylindrical roller bearing with 600 mm bore, 730 mm OD and 60 mm width per ISO 15. SKF lists C 1050 kN, C0 2550 kN, Pu 196 kN, reference speed 320 r/min and limiting speed 400 r/min, mass about 51500 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF18-600-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF18-600-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF18", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF18-600-V", "SKF NCF 18/600 V" ], "locale_variants": {} }, { "sku": "NCF18-630-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 18/630 V", "series": "NCF1800-series", "type": "cylindrical_roller", "d_mm": 630, "D_mm": 780, "B_mm": 69, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1250, "static_load_kN": 2900, "fatigue_load_limit_kN": 232, "max_rpm": 360, "reference_speed_rpm": 300, "limiting_speed_rpm": 360, "weight_g": 72500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NCF 18/630 V resolves to a 630×780×69 mm single-row full-complement cylindrical roller bearing (dimension series 18 (ultra-slim section for large shafts)); a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix V: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 2.32 (2900 against 1250 kN), and the Pu figure 232 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 300 r/min thermal reference speed and 360 r/min mechanical limiting speed. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "mining crusher eccentric shafts", "heavy offshore winch drums", "large rolling-mill and continuous-caster drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 360 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 69 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 69 mm-wide ring and concentrates load.", "The 1250/2900 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF18-630-V?", "a": "SKF NCF 18/630 V is a single-row full-complement cylindrical roller bearing with 630 mm bore, 780 mm OD and 69 mm width per ISO 15. SKF lists C 1250 kN, C0 2900 kN, Pu 232 kN, reference speed 300 r/min and limiting speed 360 r/min, mass about 72500 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF18-630-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF18-630-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF18", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF18-630-V", "SKF NCF 18/630 V" ], "locale_variants": {} }, { "sku": "NCF18-670-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 18/670 V", "series": "NCF1800-series", "type": "cylindrical_roller", "d_mm": 670, "D_mm": 820, "B_mm": 69, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1300, "static_load_kN": 3150, "fatigue_load_limit_kN": 245, "max_rpm": 340, "reference_speed_rpm": 280, "limiting_speed_rpm": 340, "weight_g": 74000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 18/670 V denotes a single-row full-complement cylindrical roller bearing on the ISO 15 670×820×69 mm envelope, dimension series 18 (ultra-slim section for large shafts), with catalogue mass 74000 g. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 670 mm seat is about 1.94 kN/mm, typical of dimension series 18 (ultra-slim section for large shafts); use C0 3150 kN for static checks such as crane hook blocks standing under load. Fit practice for NCF18-670-V: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "mining crusher eccentric shafts", "heavy offshore winch drums", "large rolling-mill and continuous-caster drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 340 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 69 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 69 mm-wide ring and concentrates load.", "The 1300/3150 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF18-670-V?", "a": "SKF NCF 18/670 V is a single-row full-complement cylindrical roller bearing with 670 mm bore, 820 mm OD and 69 mm width per ISO 15. SKF lists C 1300 kN, C0 3150 kN, Pu 245 kN, reference speed 280 r/min and limiting speed 340 r/min, mass about 74000 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF18-670-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF18-670-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF18", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF18-670-V", "SKF NCF 18/670 V" ], "locale_variants": {} }, { "sku": "NCF18-710-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 18/710 V", "series": "NCF1800-series", "type": "cylindrical_roller", "d_mm": 710, "D_mm": 870, "B_mm": 74, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1540, "static_load_kN": 3750, "fatigue_load_limit_kN": 285, "max_rpm": 320, "reference_speed_rpm": 260, "limiting_speed_rpm": 320, "weight_g": 92500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 18/710 V denotes a single-row full-complement cylindrical roller bearing on the ISO 15 710×870×74 mm envelope, dimension series 18 (ultra-slim section for large shafts), with catalogue mass 92500 g. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix V: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. The radial section height is 80.0 mm and the catalogue mass 92500 g; at 1540 kN dynamic rating this is roughly 2.17 kN of C per millimetre of bore before application factors. Fit practice for NCF18-710-V: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts", "heavy offshore winch drums" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 320 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 870 mm raceway.", "The 1540/3750 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF18-710-V?", "a": "SKF NCF 18/710 V is a single-row full-complement cylindrical roller bearing with 710 mm bore, 870 mm OD and 74 mm width per ISO 15. SKF lists C 1540 kN, C0 3750 kN, Pu 285 kN, reference speed 260 r/min and limiting speed 320 r/min, mass about 92500 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF18-710-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF18-710-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF18", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF18-710-V", "SKF NCF 18/710 V" ], "locale_variants": {} }, { "sku": "NCF18-750-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 18/750 V", "series": "NCF1800-series", "type": "cylindrical_roller", "d_mm": 750, "D_mm": 920, "B_mm": 78, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1760, "static_load_kN": 4300, "fatigue_load_limit_kN": 315, "max_rpm": 300, "reference_speed_rpm": 240, "limiting_speed_rpm": 300, "weight_g": 105000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NCF 18/750 V is a single-row full-complement cylindrical roller bearing sized 750×920×78 mm — a dimension series 18 (ultra-slim section for large shafts), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 2.44 (4300 against 1760 kN), and the Pu figure 315 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 240 r/min thermal reference speed and 300 r/min mechanical limiting speed. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 750 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts", "heavy offshore winch drums" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 300 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 920 mm raceway.", "The 1760/4300 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF18-750-V?", "a": "SKF NCF 18/750 V is a single-row full-complement cylindrical roller bearing with 750 mm bore, 920 mm OD and 78 mm width per ISO 15. SKF lists C 1760 kN, C0 4300 kN, Pu 315 kN, reference speed 240 r/min and limiting speed 300 r/min, mass about 105000 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF18-750-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF18-750-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF18", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF18-750-V", "SKF NCF 18/750 V" ], "locale_variants": {} }, { "sku": "NCF18-800-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 18/800 V", "series": "NCF1800-series", "type": "cylindrical_roller", "d_mm": 800, "D_mm": 980, "B_mm": 82, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1940, "static_load_kN": 4800, "fatigue_load_limit_kN": 345, "max_rpm": 280, "reference_speed_rpm": 220, "limiting_speed_rpm": 280, "weight_g": 126000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NCF 18/800 V is a single-row full-complement cylindrical roller bearing sized 800×980×82 mm — a dimension series 18 (ultra-slim section for large shafts), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 2.47 (4800 against 1940 kN), and the Pu figure 345 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 220 r/min thermal reference speed and 280 r/min mechanical limiting speed. Fit practice for NCF18-800-V: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "heavy offshore winch drums", "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 280 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 980 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 1940/4800 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF18-800-V?", "a": "SKF NCF 18/800 V is a single-row full-complement cylindrical roller bearing with 800 mm bore, 980 mm OD and 82 mm width per ISO 15. SKF lists C 1940 kN, C0 4800 kN, Pu 345 kN, reference speed 220 r/min and limiting speed 280 r/min, mass about 126000 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF18-800-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF18-800-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF18", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF18-800-V", "SKF NCF 18/800 V" ], "locale_variants": {} }, { "sku": "NCF18-850-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 18/850 V", "series": "NCF1800-series", "type": "cylindrical_roller", "d_mm": 850, "D_mm": 1030, "B_mm": 82, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 2050, "static_load_kN": 5200, "fatigue_load_limit_kN": 375, "max_rpm": 260, "reference_speed_rpm": 200, "limiting_speed_rpm": 260, "weight_g": 131000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NCF 18/850 V is a single-row full-complement cylindrical roller bearing sized 850×1030×82 mm — a dimension series 18 (ultra-slim section for large shafts), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix V: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. The radial section height is 90.0 mm and the catalogue mass 131000 g; at 2050 kN dynamic rating this is roughly 2.41 kN of C per millimetre of bore before application factors. Fit practice for NCF18-850-V: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "mining crusher eccentric shafts", "heavy offshore winch drums", "large rolling-mill and continuous-caster drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 260 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 1030 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 1030 mm raceway.", "The 2050/5200 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF18-850-V?", "a": "SKF NCF 18/850 V is a single-row full-complement cylindrical roller bearing with 850 mm bore, 1030 mm OD and 82 mm width per ISO 15. SKF lists C 2050 kN, C0 5200 kN, Pu 375 kN, reference speed 200 r/min and limiting speed 260 r/min, mass about 131000 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF18-850-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF18-850-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF18", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF18-850-V", "SKF NCF 18/850 V" ], "locale_variants": {} }, { "sku": "NCF18-900-V-HB1", "brand": "SKF", "manufacturer_designation": "SKF NCF 18/900 V/HB1", "series": "NCF1800-series", "type": "cylindrical_roller", "d_mm": 900, "D_mm": 1090, "B_mm": 85, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 2240, "static_load_kN": 5700, "fatigue_load_limit_kN": 405, "max_rpm": 240, "reference_speed_rpm": 190, "limiting_speed_rpm": 240, "weight_g": 154000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 900 mm shaft, SKF lists NCF18-900-V-HB1 as single-row full-complement cylindrical roller: 1090 mm OD, 85 mm wide, Pu 405 kN, the catalogue lists 190 r/min thermal reference speed and 240 r/min mechanical limiting speed. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V/HB1 identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Speed planning for NCF18-900-V-HB1: the catalogue lists 190 r/min thermal reference speed and 240 r/min mechanical limiting speed. The mass entry 154000 g covers the complete catalogue execution. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 900 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts", "heavy offshore winch drums" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 240 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 1090 mm raceway.", "The 2240/5700 kN ratings are SKF catalogue 17000 (2018) values for the V/HB1 execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF18-900-V-HB1?", "a": "SKF NCF 18/900 V/HB1 is a single-row full-complement cylindrical roller bearing with 900 mm bore, 1090 mm OD and 85 mm width per ISO 15. SKF lists C 2240 kN, C0 5700 kN, Pu 405 kN, reference speed 190 r/min and limiting speed 240 r/min, mass about 154000 g." }, { "q": "What does the NCF designation and V/HB1 suffix mean?", "a": "Suffix V/HB1 identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF18-900-V-HB1 take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF18-900-V-HB1 compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF18", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF18-900-V-HB1", "SKF NCF 18/900 V/HB1" ], "locale_variants": {} }, { "sku": "NCF18-950-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 18/950 V", "series": "NCF1800-series", "type": "cylindrical_roller", "d_mm": 950, "D_mm": 1150, "B_mm": 90, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 2420, "static_load_kN": 6300, "fatigue_load_limit_kN": 425, "max_rpm": 220, "reference_speed_rpm": 170, "limiting_speed_rpm": 220, "weight_g": 185000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 18/950 V denotes a single-row full-complement cylindrical roller bearing on the ISO 15 950×1150×90 mm envelope, dimension series 18 (ultra-slim section for large shafts), with catalogue mass 185000 g. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. With C 2420 kN and C0 6300 kN, size the bearing on the 950×1150 mm ISO 15 envelope and check the 425 kN Pu against the equivalent-load floor; the catalogue lists 170 r/min thermal reference speed and 220 r/min mechanical limiting speed. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 950 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "heavy offshore winch drums", "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 220 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 90 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 1150 mm raceway.", "The 2420/6300 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF18-950-V?", "a": "SKF NCF 18/950 V is a single-row full-complement cylindrical roller bearing with 950 mm bore, 1150 mm OD and 90 mm width per ISO 15. SKF lists C 2420 kN, C0 6300 kN, Pu 425 kN, reference speed 170 r/min and limiting speed 220 r/min, mass about 185000 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF18-950-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF18-950-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF18", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF18-950-V", "SKF NCF 18/950 V" ], "locale_variants": {} }, { "sku": "NCF1840-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 1840 V", "series": "NCF1800-series", "type": "cylindrical_roller", "d_mm": 200, "D_mm": 250, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 176, "static_load_kN": 335, "fatigue_load_limit_kN": 32.5, "max_rpm": 1400, "reference_speed_rpm": 1100, "limiting_speed_rpm": 1400, "weight_g": 2600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NCF 1840 V is a single-row full-complement cylindrical roller bearing sized 200×250×24 mm — a dimension series 18 (ultra-slim section for large shafts), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 1.90 (335 against 176 kN), and the Pu figure 32.5 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 1,100 r/min thermal reference speed and 1,400 r/min mechanical limiting speed. Fit practice for NCF1840-V: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "heavy offshore winch drums", "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 1,400 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 250 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 176/335 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF1840-V?", "a": "SKF NCF 1840 V is a single-row full-complement cylindrical roller bearing with 200 mm bore, 250 mm OD and 24 mm width per ISO 15. SKF lists C 176 kN, C0 335 kN, Pu 32.5 kN, reference speed 1,100 r/min and limiting speed 1,400 r/min, mass about 2600 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF1840-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF1840-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF1840", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF1840-V", "SKF NCF 1840 V" ], "locale_variants": {} }, { "sku": "NCF1844-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 1844 V", "series": "NCF1800-series", "type": "cylindrical_roller", "d_mm": 220, "D_mm": 270, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 183, "static_load_kN": 365, "fatigue_load_limit_kN": 34.5, "max_rpm": 1200, "reference_speed_rpm": 1000, "limiting_speed_rpm": 1200, "weight_g": 2850, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NCF 1844 V resolves to a 220×270×24 mm single-row full-complement cylindrical roller bearing (dimension series 18 (ultra-slim section for large shafts)); a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix V: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. With C 183 kN and C0 365 kN, size the bearing on the 220×270 mm ISO 15 envelope and check the 34.5 kN Pu against the equivalent-load floor; the catalogue lists 1,000 r/min thermal reference speed and 1,200 r/min mechanical limiting speed. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 220 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "heavy offshore winch drums", "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 1,200 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 270 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 183/365 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF1844-V?", "a": "SKF NCF 1844 V is a single-row full-complement cylindrical roller bearing with 220 mm bore, 270 mm OD and 24 mm width per ISO 15. SKF lists C 183 kN, C0 365 kN, Pu 34.5 kN, reference speed 1,000 r/min and limiting speed 1,200 r/min, mass about 2850 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF1844-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF1844-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF1844", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF1844-V", "SKF NCF 1844 V" ], "locale_variants": {} }, { "sku": "NCF1848-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 1848 V", "series": "NCF1800-series", "type": "cylindrical_roller", "d_mm": 240, "D_mm": 300, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 260, "static_load_kN": 510, "fatigue_load_limit_kN": 47.5, "max_rpm": 1100, "reference_speed_rpm": 900, "limiting_speed_rpm": 1100, "weight_g": 4400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NCF 1848 V is a single-row full-complement cylindrical roller bearing sized 240×300×28 mm — a dimension series 18 (ultra-slim section for large shafts), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 1.96 (510 against 260 kN), and the Pu figure 47.5 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 900 r/min thermal reference speed and 1,100 r/min mechanical limiting speed. Fit practice for NCF1848-V: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts", "heavy offshore winch drums" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 1,100 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 300 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 28 mm-wide ring and concentrates load.", "The 260/510 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF1848-V?", "a": "SKF NCF 1848 V is a single-row full-complement cylindrical roller bearing with 240 mm bore, 300 mm OD and 28 mm width per ISO 15. SKF lists C 260 kN, C0 510 kN, Pu 47.5 kN, reference speed 900 r/min and limiting speed 1,100 r/min, mass about 4400 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF1848-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF1848-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF1848", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF1848-V", "SKF NCF 1848 V" ], "locale_variants": {} }, { "sku": "NCF1852-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 1852 V", "series": "NCF1800-series", "type": "cylindrical_roller", "d_mm": 260, "D_mm": 320, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 270, "static_load_kN": 550, "fatigue_load_limit_kN": 50, "max_rpm": 1000, "reference_speed_rpm": 800, "limiting_speed_rpm": 1000, "weight_g": 4550, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NCF 1852 V resolves to a 260×320×28 mm single-row full-complement cylindrical roller bearing (dimension series 18 (ultra-slim section for large shafts)); a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. The radial section height is 30.0 mm and the catalogue mass 4550 g; at 270 kN dynamic rating this is roughly 1.04 kN of C per millimetre of bore before application factors. Fit practice for NCF1852-V: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts", "heavy offshore winch drums" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 1,000 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 28 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 270/550 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF1852-V?", "a": "SKF NCF 1852 V is a single-row full-complement cylindrical roller bearing with 260 mm bore, 320 mm OD and 28 mm width per ISO 15. SKF lists C 270 kN, C0 550 kN, Pu 50 kN, reference speed 800 r/min and limiting speed 1,000 r/min, mass about 4550 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF1852-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF1852-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF1852", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF1852-V", "SKF NCF 1852 V" ], "locale_variants": {} }, { "sku": "NCF1856-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 1856 V", "series": "NCF1800-series", "type": "cylindrical_roller", "d_mm": 280, "D_mm": 350, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 341, "static_load_kN": 695, "fatigue_load_limit_kN": 64, "max_rpm": 950, "reference_speed_rpm": 750, "limiting_speed_rpm": 950, "weight_g": 7100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NCF 1856 V is a single-row full-complement cylindrical roller bearing sized 280×350×33 mm — a dimension series 18 (ultra-slim section for large shafts), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Speed planning for NCF1856-V: the catalogue lists 750 r/min thermal reference speed and 950 r/min mechanical limiting speed. The mass entry 7100 g covers the complete catalogue execution. Fit practice for NCF1856-V: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts", "heavy offshore winch drums" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 950 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 33 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 341/695 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF1856-V?", "a": "SKF NCF 1856 V is a single-row full-complement cylindrical roller bearing with 280 mm bore, 350 mm OD and 33 mm width per ISO 15. SKF lists C 341 kN, C0 695 kN, Pu 64 kN, reference speed 750 r/min and limiting speed 950 r/min, mass about 7100 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF1856-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF1856-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF1856", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF1856-V", "SKF NCF 1856 V" ], "locale_variants": {} }, { "sku": "NCF1860-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 1860 V", "series": "NCF1800-series", "type": "cylindrical_roller", "d_mm": 300, "D_mm": 380, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 418, "static_load_kN": 850, "fatigue_load_limit_kN": 75, "max_rpm": 850, "reference_speed_rpm": 670, "limiting_speed_rpm": 850, "weight_g": 10000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NCF 1860 V resolves to a 300×380×38 mm single-row full-complement cylindrical roller bearing (dimension series 18 (ultra-slim section for large shafts)); a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix V: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 2.03 (850 against 418 kN), and the Pu figure 75 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 670 r/min thermal reference speed and 850 r/min mechanical limiting speed. Fit practice for NCF1860-V: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "mining crusher eccentric shafts", "heavy offshore winch drums", "large rolling-mill and continuous-caster drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 850 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 380 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 380 mm raceway.", "The 418/850 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF1860-V?", "a": "SKF NCF 1860 V is a single-row full-complement cylindrical roller bearing with 300 mm bore, 380 mm OD and 38 mm width per ISO 15. SKF lists C 418 kN, C0 850 kN, Pu 75 kN, reference speed 670 r/min and limiting speed 850 r/min, mass about 10000 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF1860-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF1860-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF1860", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF1860-V", "SKF NCF 1860 V" ], "locale_variants": {} }, { "sku": "NCF1864-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 1864 V", "series": "NCF1800-series", "type": "cylindrical_roller", "d_mm": 320, "D_mm": 400, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 440, "static_load_kN": 900, "fatigue_load_limit_kN": 80, "max_rpm": 800, "reference_speed_rpm": 630, "limiting_speed_rpm": 800, "weight_g": 10500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 320 mm shaft, SKF lists NCF1864-V as single-row full-complement cylindrical roller: 400 mm OD, 38 mm wide, Pu 80 kN, the catalogue lists 630 r/min thermal reference speed and 800 r/min mechanical limiting speed. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. With C 440 kN and C0 900 kN, size the bearing on the 320×400 mm ISO 15 envelope and check the 80 kN Pu against the equivalent-load floor; the catalogue lists 630 r/min thermal reference speed and 800 r/min mechanical limiting speed. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 320 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "mining crusher eccentric shafts", "heavy offshore winch drums", "large rolling-mill and continuous-caster drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 800 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 400 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 400 mm raceway.", "The 440/900 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF1864-V?", "a": "SKF NCF 1864 V is a single-row full-complement cylindrical roller bearing with 320 mm bore, 400 mm OD and 38 mm width per ISO 15. SKF lists C 440 kN, C0 900 kN, Pu 80 kN, reference speed 630 r/min and limiting speed 800 r/min, mass about 10500 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF1864-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF1864-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF1864", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF1864-V", "SKF NCF 1864 V" ], "locale_variants": {} }, { "sku": "NCF1868-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 1868 V", "series": "NCF1800-series", "type": "cylindrical_roller", "d_mm": 340, "D_mm": 420, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 446, "static_load_kN": 950, "fatigue_load_limit_kN": 83, "max_rpm": 750, "reference_speed_rpm": 600, "limiting_speed_rpm": 750, "weight_g": 11000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NCF 1868 V resolves to a 340×420×38 mm single-row full-complement cylindrical roller bearing (dimension series 18 (ultra-slim section for large shafts)); a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 340 mm seat is about 1.31 kN/mm, typical of dimension series 18 (ultra-slim section for large shafts); use C0 950 kN for static checks such as crane hook blocks standing under load. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 340 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "mining crusher eccentric shafts", "heavy offshore winch drums", "large rolling-mill and continuous-caster drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 750 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 420 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 420 mm raceway.", "The 446/950 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF1868-V?", "a": "SKF NCF 1868 V is a single-row full-complement cylindrical roller bearing with 340 mm bore, 420 mm OD and 38 mm width per ISO 15. SKF lists C 446 kN, C0 950 kN, Pu 83 kN, reference speed 600 r/min and limiting speed 750 r/min, mass about 11000 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF1868-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF1868-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF1868", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF1868-V", "SKF NCF 1868 V" ], "locale_variants": {} }, { "sku": "NCF1872-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 1872 V", "series": "NCF1800-series", "type": "cylindrical_roller", "d_mm": 360, "D_mm": 440, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 402, "static_load_kN": 900, "fatigue_load_limit_kN": 76.5, "max_rpm": 700, "reference_speed_rpm": 560, "limiting_speed_rpm": 700, "weight_g": 11500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 360 mm shaft, SKF lists NCF1872-V as single-row full-complement cylindrical roller: 440 mm OD, 38 mm wide, Pu 76.5 kN, the catalogue lists 560 r/min thermal reference speed and 700 r/min mechanical limiting speed. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix V: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. The radial section height is 40.0 mm and the catalogue mass 11500 g; at 402 kN dynamic rating this is roughly 1.12 kN of C per millimetre of bore before application factors. Fit practice for NCF1872-V: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "heavy offshore winch drums", "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 700 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 38 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 440 mm raceway.", "The 402/900 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF1872-V?", "a": "SKF NCF 1872 V is a single-row full-complement cylindrical roller bearing with 360 mm bore, 440 mm OD and 38 mm width per ISO 15. SKF lists C 402 kN, C0 900 kN, Pu 76.5 kN, reference speed 560 r/min and limiting speed 700 r/min, mass about 11500 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF1872-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF1872-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF1872", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF1872-V", "SKF NCF 1872 V" ], "locale_variants": {} }, { "sku": "NCF1876-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 1876 V", "series": "NCF1800-series", "type": "cylindrical_roller", "d_mm": 380, "D_mm": 480, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 627, "static_load_kN": 1290, "fatigue_load_limit_kN": 114, "max_rpm": 670, "reference_speed_rpm": 530, "limiting_speed_rpm": 670, "weight_g": 19500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NCF 1876 V resolves to a 380×480×46 mm single-row full-complement cylindrical roller bearing (dimension series 18 (ultra-slim section for large shafts)); a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix V: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Speed planning for NCF1876-V: the catalogue lists 530 r/min thermal reference speed and 670 r/min mechanical limiting speed. The mass entry 19500 g covers the complete catalogue execution. Fit practice for NCF1876-V: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "heavy offshore winch drums", "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 670 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 46 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 480 mm raceway.", "The 627/1290 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF1876-V?", "a": "SKF NCF 1876 V is a single-row full-complement cylindrical roller bearing with 380 mm bore, 480 mm OD and 46 mm width per ISO 15. SKF lists C 627 kN, C0 1290 kN, Pu 114 kN, reference speed 530 r/min and limiting speed 670 r/min, mass about 19500 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF1876-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF1876-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF1876", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF1876-V", "SKF NCF 1876 V" ], "locale_variants": {} }, { "sku": "NCF1880-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 1880 V", "series": "NCF1800-series", "type": "cylindrical_roller", "d_mm": 400, "D_mm": 500, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 627, "static_load_kN": 1340, "fatigue_load_limit_kN": 118, "max_rpm": 630, "reference_speed_rpm": 500, "limiting_speed_rpm": 630, "weight_g": 20500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 400 mm shaft, SKF lists NCF1880-V as single-row full-complement cylindrical roller: 500 mm OD, 46 mm wide, Pu 118 kN, the catalogue lists 500 r/min thermal reference speed and 630 r/min mechanical limiting speed. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 2.14 (1340 against 627 kN), and the Pu figure 118 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 500 r/min thermal reference speed and 630 r/min mechanical limiting speed. Fit practice for NCF1880-V: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts", "heavy offshore winch drums" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 630 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 500 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 46 mm-wide ring and concentrates load.", "The 627/1340 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF1880-V?", "a": "SKF NCF 1880 V is a single-row full-complement cylindrical roller bearing with 400 mm bore, 500 mm OD and 46 mm width per ISO 15. SKF lists C 627 kN, C0 1340 kN, Pu 118 kN, reference speed 500 r/min and limiting speed 630 r/min, mass about 20500 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF1880-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF1880-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF1880", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF1880-V", "SKF NCF 1880 V" ], "locale_variants": {} }, { "sku": "NCF1884-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 1884 V", "series": "NCF1800-series", "type": "cylindrical_roller", "d_mm": 420, "D_mm": 520, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 660, "static_load_kN": 1430, "fatigue_load_limit_kN": 122, "max_rpm": 600, "reference_speed_rpm": 480, "limiting_speed_rpm": 600, "weight_g": 20500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 1884 V denotes a single-row full-complement cylindrical roller bearing on the ISO 15 420×520×46 mm envelope, dimension series 18 (ultra-slim section for large shafts), with catalogue mass 20500 g. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. With C 660 kN and C0 1430 kN, size the bearing on the 420×520 mm ISO 15 envelope and check the 122 kN Pu against the equivalent-load floor; the catalogue lists 480 r/min thermal reference speed and 600 r/min mechanical limiting speed. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 420 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts", "heavy offshore winch drums" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 600 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 520 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 46 mm-wide ring and concentrates load.", "The 660/1430 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF1884-V?", "a": "SKF NCF 1884 V is a single-row full-complement cylindrical roller bearing with 420 mm bore, 520 mm OD and 46 mm width per ISO 15. SKF lists C 660 kN, C0 1430 kN, Pu 122 kN, reference speed 480 r/min and limiting speed 600 r/min, mass about 20500 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF1884-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF1884-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF1884", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF1884-V", "SKF NCF 1884 V" ], "locale_variants": {} }, { "sku": "NCF1888-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 1888 V", "series": "NCF1800-series", "type": "cylindrical_roller", "d_mm": 440, "D_mm": 540, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 671, "static_load_kN": 1460, "fatigue_load_limit_kN": 125, "max_rpm": 560, "reference_speed_rpm": 450, "limiting_speed_rpm": 560, "weight_g": 22000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 440 mm shaft, SKF lists NCF1888-V as single-row full-complement cylindrical roller: 540 mm OD, 46 mm wide, Pu 125 kN, the catalogue lists 450 r/min thermal reference speed and 560 r/min mechanical limiting speed. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Load-per-bore for the 440 mm seat is about 1.52 kN/mm, typical of dimension series 18 (ultra-slim section for large shafts); use C0 1460 kN for static checks such as crane hook blocks standing under load. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 440 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts", "heavy offshore winch drums" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 560 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 540 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 46 mm-wide ring and concentrates load.", "The 671/1460 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF1888-V?", "a": "SKF NCF 1888 V is a single-row full-complement cylindrical roller bearing with 440 mm bore, 540 mm OD and 46 mm width per ISO 15. SKF lists C 671 kN, C0 1460 kN, Pu 125 kN, reference speed 450 r/min and limiting speed 560 r/min, mass about 22000 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF1888-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF1888-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF1888", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF1888-V", "SKF NCF 1888 V" ], "locale_variants": {} }, { "sku": "NCF1896-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 1896 V", "series": "NCF1800-series", "type": "cylindrical_roller", "d_mm": 480, "D_mm": 600, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 935, "static_load_kN": 2040, "fatigue_load_limit_kN": 170, "max_rpm": 500, "reference_speed_rpm": 400, "limiting_speed_rpm": 500, "weight_g": 35500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 480 mm shaft, SKF lists NCF1896-V as single-row full-complement cylindrical roller: 600 mm OD, 56 mm wide, Pu 170 kN, the catalogue lists 400 r/min thermal reference speed and 500 r/min mechanical limiting speed. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix V: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. With C 935 kN and C0 2040 kN, size the bearing on the 480×600 mm ISO 15 envelope and check the 170 kN Pu against the equivalent-load floor; the catalogue lists 400 r/min thermal reference speed and 500 r/min mechanical limiting speed. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 480 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts", "heavy offshore winch drums" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 500 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 56 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 935/2040 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF1896-V?", "a": "SKF NCF 1896 V is a single-row full-complement cylindrical roller bearing with 480 mm bore, 600 mm OD and 56 mm width per ISO 15. SKF lists C 935 kN, C0 2040 kN, Pu 170 kN, reference speed 400 r/min and limiting speed 500 r/min, mass about 35500 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF1896-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF1896-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF1896", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF1896-V", "SKF NCF 1896 V" ], "locale_variants": {} }, { "sku": "NCF2224-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 2224 V", "series": "NCF2200-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 215, "B_mm": 58, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 512, "static_load_kN": 735, "fatigue_load_limit_kN": 85, "max_rpm": 1700, "reference_speed_rpm": 1400, "limiting_speed_rpm": 1700, "weight_g": 9050, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NCF 2224 V is a single-row full-complement cylindrical roller bearing sized 120×215×58 mm — a dimension series 22 (light-section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix V: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. With C 512 kN and C0 735 kN, size the bearing on the 120×215 mm ISO 15 envelope and check the 85 kN Pu against the equivalent-load floor; the catalogue lists 1,400 r/min thermal reference speed and 1,700 r/min mechanical limiting speed. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 120 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "heavy offshore winch drums", "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 1,700 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 215 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 512/735 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2224-V?", "a": "SKF NCF 2224 V is a single-row full-complement cylindrical roller bearing with 120 mm bore, 215 mm OD and 58 mm width per ISO 15. SKF lists C 512 kN, C0 735 kN, Pu 85 kN, reference speed 1,400 r/min and limiting speed 1,700 r/min, mass about 9050 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF2224-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF2224-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF2224", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2224-V", "SKF NCF 2224 V" ], "locale_variants": {} }, { "sku": "NCF2228-ECJB", "brand": "SKF", "manufacturer_designation": "SKF NCF 2228 ECJB", "series": "NCF2200-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 250, "B_mm": 68, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 680, "static_load_kN": 880, "fatigue_load_limit_kN": 96.5, "max_rpm": 3600, "reference_speed_rpm": 2800, "limiting_speed_rpm": 3600, "weight_g": 14500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NCF2228-ECJB is the 140 mm bore entry in the NCF2200 range: a 140×250×68 mm high-capacity cylindrical roller bearing with a pressed sheet-steel window-type cage, rated C 680 kN / C0 880 kN. Reading the NCF prefix: the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope. This makes the execution the non-locating member of the paired high-capacity arrangement, absorbing axial displacement while carrying the full high radial rating. Reading the order-string suffix ECJB: the high-capacity execution with pressed-steel cages (the /PEX mark denotes the pinion-shaft special build with its own catalogue rating line). Speed planning for NCF2228-ECJB: the catalogue lists 2,800 r/min thermal reference speed and 3,600 r/min mechanical limiting speed. The mass entry 14500 g covers the complete catalogue execution. Assembly note: used opposite the NUH locating bearing on wind-gearbox and heavy industrial pinion shafts; fit the inner ring with interference and let this bearing float axially. Heat steel rings inductively to max 120 °C. This is the standard catalogue execution of the high-capacity design. Selected sizes in the range are also produced as /PEX pinion-shaft builds for wind-turbine gearboxes — separate order numbers with their own rating lines and internal profiling; the two must not be mixed using one another’s loads.", "applications": [ "offshore and marine heavy drive trains", "large mining mill pinion shafts", "multi-megawatt wind turbine main gearboxes" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "micro-pitting on the profiled rollers under contaminated or starved-lubricant conditions despite the black-oxide treatment", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "cage fatigue in heavily reversing wind-turbine load cycles when relubrication intervals are exceeded", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "High-capacity NUH and NCF bearings are designed as a locating/non-locating PAIR on the same shaft; fitting two locating NUH bearings can preload the arrangement thermally.", "The /PEX pinion execution carries its own rating line and internal geometry — never substitute a standard NCF 2228 using the /PEX loads.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 68 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 68 mm-wide ring and concentrates load.", "The 680/880 kN ratings are SKF catalogue 17000 (2018) values for the ECJB execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2228-ECJB?", "a": "SKF NCF 2228 ECJB is a high-capacity cylindrical roller bearing with 140 mm bore, 250 mm OD and 68 mm width per ISO 15. SKF lists C 680 kN, C0 880 kN, Pu 96.5 kN, reference speed 2,800 r/min and limiting speed 3,600 r/min, mass about 14500 g." }, { "q": "What does the NCF designation and ECJB suffix mean?", "a": "The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Structurally this execution has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope." }, { "q": "Can NCF2228-ECJB take axial load and locate the shaft?", "a": "The high-capacity NCF ECJB execution is the non-locating partner in the NUH/NCF pair and should float axially." }, { "q": "How does NCF2228-ECJB compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NUH2228-ECMH", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 140×250×68 mm and equivalent catalogue ratings; the NUH execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.2 high-capacity cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2228-ECJB", "SKF NCF 2228 ECJB" ], "locale_variants": {} }, { "sku": "NCF2228-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 2228 V", "series": "NCF2200-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 250, "B_mm": 68, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 693, "static_load_kN": 1020, "fatigue_load_limit_kN": 114, "max_rpm": 1500, "reference_speed_rpm": 1200, "limiting_speed_rpm": 1500, "weight_g": 14500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NCF2228-V is the 140 mm bore entry in the NCF2200 range: a 140×250×68 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 693 kN / C0 1020 kN. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix V: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 140 mm seat is about 4.95 kN/mm, typical of dimension series 22 (light-section, wide); use C0 1020 kN for static checks such as crane hook blocks standing under load. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 140 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "heavy offshore winch drums", "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 1,500 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 250 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 693/1020 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2228-V?", "a": "SKF NCF 2228 V is a single-row full-complement cylindrical roller bearing with 140 mm bore, 250 mm OD and 68 mm width per ISO 15. SKF lists C 693 kN, C0 1020 kN, Pu 114 kN, reference speed 1,200 r/min and limiting speed 1,500 r/min, mass about 14500 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF2228-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF2228-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF2228", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2228-V", "SKF NCF 2228 V" ], "locale_variants": {} }, { "sku": "NCF2230-ECJB", "brand": "SKF", "manufacturer_designation": "SKF NCF 2230 ECJB", "series": "NCF2200-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 270, "B_mm": 73, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 780, "static_load_kN": 1040, "fatigue_load_limit_kN": 112, "max_rpm": 3400, "reference_speed_rpm": 2600, "limiting_speed_rpm": 3400, "weight_g": 18000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NCF2230-ECJB is the 150 mm bore entry in the NCF2200 range: a 150×270×73 mm high-capacity cylindrical roller bearing with a pressed sheet-steel window-type cage, rated C 780 kN / C0 1040 kN. The NCF configuration means the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope; functionally the bearing is the non-locating member of the paired high-capacity arrangement, absorbing axial displacement while carrying the full high radial rating. Reading the order-string suffix ECJB: the high-capacity execution with pressed-steel cages (the /PEX mark denotes the pinion-shaft special build with its own catalogue rating line). Speed planning for NCF2230-ECJB: the catalogue lists 2,600 r/min thermal reference speed and 3,400 r/min mechanical limiting speed. The mass entry 18000 g covers the complete catalogue execution. Assembly note: used opposite the NUH locating bearing on wind-gearbox and heavy industrial pinion shafts; fit the inner ring with interference and let this bearing float axially. Heat steel rings inductively to max 120 °C. This is the standard catalogue execution of the high-capacity design. Selected sizes in the range are also produced as /PEX pinion-shaft builds for wind-turbine gearboxes — separate order numbers with their own rating lines and internal profiling; the two must not be mixed using one another’s loads.", "applications": [ "multi-megawatt wind turbine main gearboxes", "offshore and marine heavy drive trains", "large mining mill pinion shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "micro-pitting on the profiled rollers under contaminated or starved-lubricant conditions despite the black-oxide treatment", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "cage fatigue in heavily reversing wind-turbine load cycles when relubrication intervals are exceeded", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "High-capacity NUH and NCF bearings are designed as a locating/non-locating PAIR on the same shaft; fitting two locating NUH bearings can preload the arrangement thermally.", "The /PEX pinion execution carries its own rating line and internal geometry — never substitute a standard NCF 2230 using the /PEX loads.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 270 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 73 mm-wide ring and concentrates load.", "The 780/1040 kN ratings are SKF catalogue 17000 (2018) values for the ECJB execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2230-ECJB?", "a": "SKF NCF 2230 ECJB is a high-capacity cylindrical roller bearing with 150 mm bore, 270 mm OD and 73 mm width per ISO 15. SKF lists C 780 kN, C0 1040 kN, Pu 112 kN, reference speed 2,600 r/min and limiting speed 3,400 r/min, mass about 18000 g." }, { "q": "What does the NCF designation and ECJB suffix mean?", "a": "The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Structurally this execution has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope." }, { "q": "Can NCF2230-ECJB take axial load and locate the shaft?", "a": "The high-capacity NCF ECJB execution is the non-locating partner in the NUH/NCF pair and should float axially." }, { "q": "How does NCF2230-ECJB compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NUH2230-ECMH", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 150×270×73 mm and equivalent catalogue ratings; the NUH execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.2 high-capacity cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2230-ECJB", "SKF NCF 2230 ECJB" ], "locale_variants": {} }, { "sku": "NCF2230-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 2230 V", "series": "NCF2200-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 270, "B_mm": 73, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 781, "static_load_kN": 1220, "fatigue_load_limit_kN": 132, "max_rpm": 1200, "reference_speed_rpm": 950, "limiting_speed_rpm": 1200, "weight_g": 18500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 150 mm shaft, SKF lists NCF2230-V as single-row full-complement cylindrical roller: 270 mm OD, 73 mm wide, Pu 132 kN, the catalogue lists 950 r/min thermal reference speed and 1,200 r/min mechanical limiting speed. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix V: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Speed planning for NCF2230-V: the catalogue lists 950 r/min thermal reference speed and 1,200 r/min mechanical limiting speed. The mass entry 18500 g covers the complete catalogue execution. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 150 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "heavy offshore winch drums", "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 1,200 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 270 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 781/1220 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2230-V?", "a": "SKF NCF 2230 V is a single-row full-complement cylindrical roller bearing with 150 mm bore, 270 mm OD and 73 mm width per ISO 15. SKF lists C 781 kN, C0 1220 kN, Pu 132 kN, reference speed 950 r/min and limiting speed 1,200 r/min, mass about 18500 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF2230-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF2230-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF2230", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2230-V", "SKF NCF 2230 V" ], "locale_variants": {} }, { "sku": "NCF2232-ECJB", "brand": "SKF", "manufacturer_designation": "SKF NCF 2232 ECJB", "series": "NCF2200-series", "type": "cylindrical_roller", "d_mm": 160, "D_mm": 290, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 980, "static_load_kN": 1270, "fatigue_load_limit_kN": 134, "max_rpm": 3000, "reference_speed_rpm": 2400, "limiting_speed_rpm": 3000, "weight_g": 23500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NCF 2232 ECJB is a high-capacity cylindrical roller bearing sized 160×290×80 mm — a dimension series 22 (light-section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.2. Reading the NCF prefix: the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope. This makes the execution the non-locating member of the paired high-capacity arrangement, absorbing axial displacement while carrying the full high radial rating. Reading the order-string suffix ECJB: the high-capacity execution with pressed-steel cages (the /PEX mark denotes the pinion-shaft special build with its own catalogue rating line). Selection arithmetic: C0/C ≈ 1.30 (1270 against 980 kN), and the Pu figure 134 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 2,400 r/min thermal reference speed and 3,000 r/min mechanical limiting speed. Assembly note: used opposite the NUH locating bearing on wind-gearbox and heavy industrial pinion shafts; fit the inner ring with interference and let this bearing float axially. Heat steel rings inductively to max 120 °C. This is the standard catalogue execution of the high-capacity design. Selected sizes in the range are also produced as /PEX pinion-shaft builds for wind-turbine gearboxes — separate order numbers with their own rating lines and internal profiling; the two must not be mixed using one another’s loads.", "applications": [ "offshore and marine heavy drive trains", "large mining mill pinion shafts", "multi-megawatt wind turbine main gearboxes" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "micro-pitting on the profiled rollers under contaminated or starved-lubricant conditions despite the black-oxide treatment", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "cage fatigue in heavily reversing wind-turbine load cycles when relubrication intervals are exceeded", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "High-capacity NUH and NCF bearings are designed as a locating/non-locating PAIR on the same shaft; fitting two locating NUH bearings can preload the arrangement thermally.", "The /PEX pinion execution carries its own rating line and internal geometry — never substitute a standard NCF 2232 using the /PEX loads.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 80 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 80 mm-wide ring and concentrates load.", "The 980/1270 kN ratings are SKF catalogue 17000 (2018) values for the ECJB execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2232-ECJB?", "a": "SKF NCF 2232 ECJB is a high-capacity cylindrical roller bearing with 160 mm bore, 290 mm OD and 80 mm width per ISO 15. SKF lists C 980 kN, C0 1270 kN, Pu 134 kN, reference speed 2,400 r/min and limiting speed 3,000 r/min, mass about 23500 g." }, { "q": "What does the NCF designation and ECJB suffix mean?", "a": "The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Structurally this execution has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope." }, { "q": "Can NCF2232-ECJB take axial load and locate the shaft?", "a": "The high-capacity NCF ECJB execution is the non-locating partner in the NUH/NCF pair and should float axially." }, { "q": "How does NCF2232-ECJB compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NUH2232-ECMH", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 160×290×80 mm and equivalent catalogue ratings; the NUH execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.2 high-capacity cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2232-ECJB", "SKF NCF 2232 ECJB" ], "locale_variants": {} }, { "sku": "NCF2232-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 2232 V", "series": "NCF2200-series", "type": "cylindrical_roller", "d_mm": 160, "D_mm": 290, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 990, "static_load_kN": 1500, "fatigue_load_limit_kN": 160, "max_rpm": 1200, "reference_speed_rpm": 950, "limiting_speed_rpm": 1200, "weight_g": 23000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NCF 2232 V is a single-row full-complement cylindrical roller bearing sized 160×290×80 mm — a dimension series 22 (light-section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. The radial section height is 65.0 mm and the catalogue mass 23000 g; at 990 kN dynamic rating this is roughly 6.19 kN of C per millimetre of bore before application factors. Fit practice for NCF2232-V: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts", "heavy offshore winch drums" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 1,200 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 80 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 990/1500 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2232-V?", "a": "SKF NCF 2232 V is a single-row full-complement cylindrical roller bearing with 160 mm bore, 290 mm OD and 80 mm width per ISO 15. SKF lists C 990 kN, C0 1500 kN, Pu 160 kN, reference speed 950 r/min and limiting speed 1,200 r/min, mass about 23000 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF2232-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF2232-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF2232", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2232-V", "SKF NCF 2232 V" ], "locale_variants": {} }, { "sku": "NCF2234-ECJB", "brand": "SKF", "manufacturer_designation": "SKF NCF 2234 ECJB", "series": "NCF2200-series", "type": "cylindrical_roller", "d_mm": 170, "D_mm": 310, "B_mm": 86, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1160, "static_load_kN": 1530, "fatigue_load_limit_kN": 156, "max_rpm": 2800, "reference_speed_rpm": 2200, "limiting_speed_rpm": 2800, "weight_g": 28000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NCF 2234 ECJB resolves to a 170×310×86 mm high-capacity cylindrical roller bearing (dimension series 22 (light-section, wide)); the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope. Structurally, the NCF design has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope. In arrangement terms it is the non-locating member of the paired high-capacity arrangement, absorbing axial displacement while carrying the full high radial rating. Reading the order-string suffix ECJB: the high-capacity execution with pressed-steel cages (the /PEX mark denotes the pinion-shaft special build with its own catalogue rating line). With C 1160 kN and C0 1530 kN, size the bearing on the 170×310 mm ISO 15 envelope and check the 156 kN Pu against the equivalent-load floor; the catalogue lists 2,200 r/min thermal reference speed and 2,800 r/min mechanical limiting speed. Assembly note: used opposite the NUH locating bearing on wind-gearbox and heavy industrial pinion shafts; fit the inner ring with interference and let this bearing float axially. Heat steel rings inductively to max 120 °C. This is the standard catalogue execution of the high-capacity design. Selected sizes in the range are also produced as /PEX pinion-shaft builds for wind-turbine gearboxes — separate order numbers with their own rating lines and internal profiling; the two must not be mixed using one another’s loads.", "applications": [ "large mining mill pinion shafts", "multi-megawatt wind turbine main gearboxes", "offshore and marine heavy drive trains" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "micro-pitting on the profiled rollers under contaminated or starved-lubricant conditions despite the black-oxide treatment", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "cage fatigue in heavily reversing wind-turbine load cycles when relubrication intervals are exceeded", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "High-capacity NUH and NCF bearings are designed as a locating/non-locating PAIR on the same shaft; fitting two locating NUH bearings can preload the arrangement thermally.", "The /PEX pinion execution carries its own rating line and internal geometry — never substitute a standard NCF 2234 using the /PEX loads.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 86 mm-wide ring and concentrates load.", "The 1160/1530 kN ratings are SKF catalogue 17000 (2018) values for the ECJB execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2234-ECJB?", "a": "SKF NCF 2234 ECJB is a high-capacity cylindrical roller bearing with 170 mm bore, 310 mm OD and 86 mm width per ISO 15. SKF lists C 1160 kN, C0 1530 kN, Pu 156 kN, reference speed 2,200 r/min and limiting speed 2,800 r/min, mass about 28000 g." }, { "q": "What does the NCF designation and ECJB suffix mean?", "a": "The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Structurally this execution has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope." }, { "q": "Can NCF2234-ECJB take axial load and locate the shaft?", "a": "The high-capacity NCF ECJB execution is the non-locating partner in the NUH/NCF pair and should float axially." }, { "q": "How does NCF2234-ECJB compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NUH2234-ECMH", "equiv_brand": "SKF", "level": "partial", "note": "Same ISO 15 envelope 170×310×86 mm, but catalogue C/C0 ratings differ between executions (1160/1530 vs 1600/1530 kN) and the NUH flange/ring configuration differs — envelope match, not a load-rating equivalent." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.2 high-capacity cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2234-ECJB", "SKF NCF 2234 ECJB" ], "locale_variants": {} }, { "sku": "NCF2234-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 2234 V", "series": "NCF2200-series", "type": "cylindrical_roller", "d_mm": 170, "D_mm": 310, "B_mm": 86, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1100, "static_load_kN": 1700, "fatigue_load_limit_kN": 176, "max_rpm": 1100, "reference_speed_rpm": 900, "limiting_speed_rpm": 1100, "weight_g": 28500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 2234 V denotes a single-row full-complement cylindrical roller bearing on the ISO 15 170×310×86 mm envelope, dimension series 22 (light-section, wide), with catalogue mass 28500 g. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 1.55 (1700 against 1100 kN), and the Pu figure 176 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 900 r/min thermal reference speed and 1,100 r/min mechanical limiting speed. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "heavy offshore winch drums", "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 1,100 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 310 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 1100/1700 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2234-V?", "a": "SKF NCF 2234 V is a single-row full-complement cylindrical roller bearing with 170 mm bore, 310 mm OD and 86 mm width per ISO 15. SKF lists C 1100 kN, C0 1700 kN, Pu 176 kN, reference speed 900 r/min and limiting speed 1,100 r/min, mass about 28500 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF2234-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF2234-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF2234", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2234-V", "SKF NCF 2234 V" ], "locale_variants": {} }, { "sku": "NCF2236-ECJB", "brand": "SKF", "manufacturer_designation": "SKF NCF 2236 ECJB", "series": "NCF2200-series", "type": "cylindrical_roller", "d_mm": 180, "D_mm": 320, "B_mm": 86, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1200, "static_load_kN": 1600, "fatigue_load_limit_kN": 166, "max_rpm": 2800, "reference_speed_rpm": 2200, "limiting_speed_rpm": 2800, "weight_g": 30000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NCF 2236 ECJB is a high-capacity cylindrical roller bearing sized 180×320×86 mm — a dimension series 22 (light-section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.2. The NCF configuration means the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope; functionally the bearing is the non-locating member of the paired high-capacity arrangement, absorbing axial displacement while carrying the full high radial rating. The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Speed planning for NCF2236-ECJB: the catalogue lists 2,200 r/min thermal reference speed and 2,800 r/min mechanical limiting speed. The mass entry 30000 g covers the complete catalogue execution. Assembly note: used opposite the NUH locating bearing on wind-gearbox and heavy industrial pinion shafts; fit the inner ring with interference and let this bearing float axially. Heat steel rings inductively to max 120 °C. This is the standard catalogue execution of the high-capacity design. Selected sizes in the range are also produced as /PEX pinion-shaft builds for wind-turbine gearboxes — separate order numbers with their own rating lines and internal profiling; the two must not be mixed using one another’s loads.", "applications": [ "large mining mill pinion shafts", "multi-megawatt wind turbine main gearboxes", "offshore and marine heavy drive trains" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "micro-pitting on the profiled rollers under contaminated or starved-lubricant conditions despite the black-oxide treatment", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "cage fatigue in heavily reversing wind-turbine load cycles when relubrication intervals are exceeded", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "High-capacity NUH and NCF bearings are designed as a locating/non-locating PAIR on the same shaft; fitting two locating NUH bearings can preload the arrangement thermally.", "The /PEX pinion execution carries its own rating line and internal geometry — never substitute a standard NCF 2236 using the /PEX loads.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 320 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 1200/1600 kN ratings are SKF catalogue 17000 (2018) values for the ECJB execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2236-ECJB?", "a": "SKF NCF 2236 ECJB is a high-capacity cylindrical roller bearing with 180 mm bore, 320 mm OD and 86 mm width per ISO 15. SKF lists C 1200 kN, C0 1600 kN, Pu 166 kN, reference speed 2,200 r/min and limiting speed 2,800 r/min, mass about 30000 g." }, { "q": "What does the NCF designation and ECJB suffix mean?", "a": "The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Structurally this execution has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope." }, { "q": "Can NCF2236-ECJB take axial load and locate the shaft?", "a": "The high-capacity NCF ECJB execution is the non-locating partner in the NUH/NCF pair and should float axially." }, { "q": "How does NCF2236-ECJB compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NUH2236-ECMH", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 180×320×86 mm and equivalent catalogue ratings; the NUH execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.2 high-capacity cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2236-ECJB", "SKF NCF 2236 ECJB" ], "locale_variants": {} }, { "sku": "NCF2238-ECJB", "brand": "SKF", "manufacturer_designation": "SKF NCF 2238 ECJB", "series": "NCF2200-series", "type": "cylindrical_roller", "d_mm": 190, "D_mm": 340, "B_mm": 92, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1320, "static_load_kN": 1760, "fatigue_load_limit_kN": 180, "max_rpm": 2600, "reference_speed_rpm": 2000, "limiting_speed_rpm": 2600, "weight_g": 36500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NCF 2238 ECJB resolves to a 190×340×92 mm high-capacity cylindrical roller bearing (dimension series 22 (light-section, wide)); the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope. Reading the NCF prefix: the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope. This makes the execution the non-locating member of the paired high-capacity arrangement, absorbing axial displacement while carrying the full high radial rating. The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Selection arithmetic: C0/C ≈ 1.33 (1760 against 1320 kN), and the Pu figure 180 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 2,000 r/min thermal reference speed and 2,600 r/min mechanical limiting speed. Assembly note: used opposite the NUH locating bearing on wind-gearbox and heavy industrial pinion shafts; fit the inner ring with interference and let this bearing float axially. Heat steel rings inductively to max 120 °C. This is the standard catalogue execution of the high-capacity design. Selected sizes in the range are also produced as /PEX pinion-shaft builds for wind-turbine gearboxes — separate order numbers with their own rating lines and internal profiling; the two must not be mixed using one another’s loads.", "applications": [ "multi-megawatt wind turbine main gearboxes", "offshore and marine heavy drive trains", "large mining mill pinion shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "micro-pitting on the profiled rollers under contaminated or starved-lubricant conditions despite the black-oxide treatment", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "cage fatigue in heavily reversing wind-turbine load cycles when relubrication intervals are exceeded", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "High-capacity NUH and NCF bearings are designed as a locating/non-locating PAIR on the same shaft; fitting two locating NUH bearings can preload the arrangement thermally.", "The /PEX pinion execution carries its own rating line and internal geometry — never substitute a standard NCF 2238 using the /PEX loads.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 92 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 1320/1760 kN ratings are SKF catalogue 17000 (2018) values for the ECJB execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2238-ECJB?", "a": "SKF NCF 2238 ECJB is a high-capacity cylindrical roller bearing with 190 mm bore, 340 mm OD and 92 mm width per ISO 15. SKF lists C 1320 kN, C0 1760 kN, Pu 180 kN, reference speed 2,000 r/min and limiting speed 2,600 r/min, mass about 36500 g." }, { "q": "What does the NCF designation and ECJB suffix mean?", "a": "The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Structurally this execution has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope." }, { "q": "Can NCF2238-ECJB take axial load and locate the shaft?", "a": "The high-capacity NCF ECJB execution is the non-locating partner in the NUH/NCF pair and should float axially." }, { "q": "How does NCF2238-ECJB compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NUH2238-ECMH", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 190×340×92 mm and equivalent catalogue ratings; the NUH execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.2 high-capacity cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2238-ECJB", "SKF NCF 2238 ECJB" ], "locale_variants": {} }, { "sku": "NCF2238-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 2238 V", "series": "NCF2200-series", "type": "cylindrical_roller", "d_mm": 190, "D_mm": 340, "B_mm": 92, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1250, "static_load_kN": 1900, "fatigue_load_limit_kN": 196, "max_rpm": 1000, "reference_speed_rpm": 800, "limiting_speed_rpm": 1000, "weight_g": 35500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 190 mm shaft, SKF lists NCF2238-V as single-row full-complement cylindrical roller: 340 mm OD, 92 mm wide, Pu 196 kN, the catalogue lists 800 r/min thermal reference speed and 1,000 r/min mechanical limiting speed. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The radial section height is 75.0 mm and the catalogue mass 35500 g; at 1250 kN dynamic rating this is roughly 6.58 kN of C per millimetre of bore before application factors. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "mining crusher eccentric shafts", "heavy offshore winch drums", "large rolling-mill and continuous-caster drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 1,000 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 1250/1900 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2238-V?", "a": "SKF NCF 2238 V is a single-row full-complement cylindrical roller bearing with 190 mm bore, 340 mm OD and 92 mm width per ISO 15. SKF lists C 1250 kN, C0 1900 kN, Pu 196 kN, reference speed 800 r/min and limiting speed 1,000 r/min, mass about 35500 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF2238-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF2238-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF2238", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2238-V", "SKF NCF 2238 V" ], "locale_variants": {} }, { "sku": "NCF2240-ECJB", "brand": "SKF", "manufacturer_designation": "SKF NCF 2240 ECJB", "series": "NCF2200-series", "type": "cylindrical_roller", "d_mm": 200, "D_mm": 360, "B_mm": 98, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1460, "static_load_kN": 2000, "fatigue_load_limit_kN": 200, "max_rpm": 2400, "reference_speed_rpm": 1900, "limiting_speed_rpm": 2400, "weight_g": 43000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 2240 ECJB denotes a high-capacity cylindrical roller bearing on the ISO 15 200×360×98 mm envelope, dimension series 22 (light-section, wide), with catalogue mass 43000 g. The NCF configuration means the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope; functionally the bearing is the non-locating member of the paired high-capacity arrangement, absorbing axial displacement while carrying the full high radial rating. The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. The pressed sheet-steel window-type cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 1.37 (2000 against 1460 kN), and the Pu figure 200 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 1,900 r/min thermal reference speed and 2,400 r/min mechanical limiting speed. Fit practice for NCF2240-ECJB: used opposite the NUH locating bearing on wind-gearbox and heavy industrial pinion shafts; fit the inner ring with interference and let this bearing float axially. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment. This is the standard catalogue execution of the high-capacity design. Selected sizes in the range are also produced as /PEX pinion-shaft builds for wind-turbine gearboxes — separate order numbers with their own rating lines and internal profiling; the two must not be mixed using one another’s loads.", "applications": [ "large mining mill pinion shafts", "multi-megawatt wind turbine main gearboxes", "offshore and marine heavy drive trains" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "micro-pitting on the profiled rollers under contaminated or starved-lubricant conditions despite the black-oxide treatment", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "cage fatigue in heavily reversing wind-turbine load cycles when relubrication intervals are exceeded", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "High-capacity NUH and NCF bearings are designed as a locating/non-locating PAIR on the same shaft; fitting two locating NUH bearings can preload the arrangement thermally.", "The /PEX pinion execution carries its own rating line and internal geometry — never substitute a standard NCF 2240 using the /PEX loads.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 360 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 1460/2000 kN ratings are SKF catalogue 17000 (2018) values for the ECJB execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2240-ECJB?", "a": "SKF NCF 2240 ECJB is a high-capacity cylindrical roller bearing with 200 mm bore, 360 mm OD and 98 mm width per ISO 15. SKF lists C 1460 kN, C0 2000 kN, Pu 200 kN, reference speed 1,900 r/min and limiting speed 2,400 r/min, mass about 43000 g." }, { "q": "What does the NCF designation and ECJB suffix mean?", "a": "The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Structurally this execution has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope." }, { "q": "Can NCF2240-ECJB take axial load and locate the shaft?", "a": "The high-capacity NCF ECJB execution is the non-locating partner in the NUH/NCF pair and should float axially." }, { "q": "How does NCF2240-ECJB compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NUH2240-ECMH", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 200×360×98 mm and equivalent catalogue ratings; the NUH execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.2 high-capacity cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2240-ECJB", "SKF NCF 2240 ECJB" ], "locale_variants": {} }, { "sku": "NCF2244-ECJB", "brand": "SKF", "manufacturer_designation": "SKF NCF 2244 ECJB", "series": "NCF2200-series", "type": "cylindrical_roller", "d_mm": 220, "D_mm": 400, "B_mm": 108, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1760, "static_load_kN": 2600, "fatigue_load_limit_kN": 240, "max_rpm": 2200, "reference_speed_rpm": 1600, "limiting_speed_rpm": 2200, "weight_g": 58500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 2244 ECJB denotes a high-capacity cylindrical roller bearing on the ISO 15 220×400×108 mm envelope, dimension series 22 (light-section, wide), with catalogue mass 58500 g. Structurally, the NCF design has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope. In arrangement terms it is the non-locating member of the paired high-capacity arrangement, absorbing axial displacement while carrying the full high radial rating. Reading the order-string suffix ECJB: the high-capacity execution with pressed-steel cages (the /PEX mark denotes the pinion-shaft special build with its own catalogue rating line). Speed planning for NCF2244-ECJB: the catalogue lists 1,600 r/min thermal reference speed and 2,200 r/min mechanical limiting speed. The mass entry 58500 g covers the complete catalogue execution. Fit practice for NCF2244-ECJB: used opposite the NUH locating bearing on wind-gearbox and heavy industrial pinion shafts; fit the inner ring with interference and let this bearing float axially. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment. This is the standard catalogue execution of the high-capacity design. Selected sizes in the range are also produced as /PEX pinion-shaft builds for wind-turbine gearboxes — separate order numbers with their own rating lines and internal profiling; the two must not be mixed using one another’s loads.", "applications": [ "multi-megawatt wind turbine main gearboxes", "offshore and marine heavy drive trains", "large mining mill pinion shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "micro-pitting on the profiled rollers under contaminated or starved-lubricant conditions despite the black-oxide treatment", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "cage fatigue in heavily reversing wind-turbine load cycles when relubrication intervals are exceeded", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "High-capacity NUH and NCF bearings are designed as a locating/non-locating PAIR on the same shaft; fitting two locating NUH bearings can preload the arrangement thermally.", "The /PEX pinion execution carries its own rating line and internal geometry — never substitute a standard NCF 2244 using the /PEX loads.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 400 mm raceway.", "The 1760/2600 kN ratings are SKF catalogue 17000 (2018) values for the ECJB execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2244-ECJB?", "a": "SKF NCF 2244 ECJB is a high-capacity cylindrical roller bearing with 220 mm bore, 400 mm OD and 108 mm width per ISO 15. SKF lists C 1760 kN, C0 2600 kN, Pu 240 kN, reference speed 1,600 r/min and limiting speed 2,200 r/min, mass about 58500 g." }, { "q": "What does the NCF designation and ECJB suffix mean?", "a": "The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Structurally this execution has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope." }, { "q": "Can NCF2244-ECJB take axial load and locate the shaft?", "a": "The high-capacity NCF ECJB execution is the non-locating partner in the NUH/NCF pair and should float axially." }, { "q": "How does NCF2244-ECJB compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NCF2244-ECJB-PEX", "equiv_brand": "SKF", "level": "partial", "note": "Same ISO 15 envelope 220×400×108 mm, but catalogue C/C0 ratings differ between executions (1760/2600 vs 2000/2600 kN) and the NCF flange/ring configuration differs — envelope match, not a load-rating equivalent." }, { "equiv_sku": "NUH2244-ECMH", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 220×400×108 mm and equivalent catalogue ratings; the NUH execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUH2244-ECMH-PEX", "equiv_brand": "SKF", "level": "partial", "note": "Same ISO 15 envelope 220×400×108 mm, but catalogue C/C0 ratings differ between executions (1760/2600 vs 2000/2600 kN) and the NUH flange/ring configuration differs — envelope match, not a load-rating equivalent." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.2 high-capacity cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2244-ECJB", "SKF NCF 2244 ECJB" ], "locale_variants": {} }, { "sku": "NCF2244-ECJB-PEX", "brand": "SKF", "manufacturer_designation": "SKF NCF 2244 ECJB/PEX", "series": "NCF2200-series", "type": "cylindrical_roller", "d_mm": 220, "D_mm": 400, "B_mm": 108, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2000, "static_load_kN": 2600, "fatigue_load_limit_kN": 240, "max_rpm": 2200, "reference_speed_rpm": 1700, "limiting_speed_rpm": 2200, "weight_g": 58500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 220 mm shaft, SKF lists NCF2244-ECJB-PEX as high-capacity cylindrical roller: 400 mm OD, 108 mm wide, Pu 240 kN, the catalogue lists 1,700 r/min thermal reference speed and 2,200 r/min mechanical limiting speed. Structurally, the NCF design has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope. In arrangement terms it is the non-locating member of the paired high-capacity arrangement, absorbing axial displacement while carrying the full high radial rating. The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. The pressed sheet-steel window-type cage is reflected in the published speeds and temperature limits. The radial section height is 90.0 mm and the catalogue mass 58500 g; at 2000 kN dynamic rating this is roughly 9.09 kN of C per millimetre of bore before application factors. Fit practice for NCF2244-ECJB-PEX: used opposite the NUH locating bearing on wind-gearbox and heavy industrial pinion shafts; fit the inner ring with interference and let this bearing float axially. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment. The /PEX mark identifies the pinion-shaft build: it is the execution developed for the pinion position in wind-turbine and heavy industrial gearboxes, and SKF publishes its own rating line (C 2000 kN / C0 2600 kN here) because the roller complement and internal profiling differ from the standard execution. Treat NCF2244-ECJB-PEX as a separate service part: do not substitute the standard NCF 2244 bearing against the /PEX loads, and refit pinion arrangements with the same /PEX order number to preserve the calculated L10 and peak-torque margin.", "applications": [ "offshore and marine heavy drive trains", "large mining mill pinion shafts", "multi-megawatt wind turbine main gearboxes" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "micro-pitting on the profiled rollers under contaminated or starved-lubricant conditions despite the black-oxide treatment", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "cage fatigue in heavily reversing wind-turbine load cycles when relubrication intervals are exceeded", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "High-capacity NUH and NCF bearings are designed as a locating/non-locating PAIR on the same shaft; fitting two locating NUH bearings can preload the arrangement thermally.", "The /PEX pinion build and the standard NCF 2244 bearing are separate service parts with different internal profiling and rating lines; replacing the /PEX part with the standard execution silently erases the peak-torque margin the gearbox was designed for.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 2000/2600 kN ratings are SKF catalogue 17000 (2018) values for the ECJB/PEX execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2244-ECJB-PEX?", "a": "SKF NCF 2244 ECJB/PEX is a high-capacity cylindrical roller bearing with 220 mm bore, 400 mm OD and 108 mm width per ISO 15. SKF lists C 2000 kN, C0 2600 kN, Pu 240 kN, reference speed 1,700 r/min and limiting speed 2,200 r/min, mass about 58500 g." }, { "q": "What does the NCF designation and ECJB/PEX suffix mean?", "a": "The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Structurally this execution has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope." }, { "q": "Can NCF2244-ECJB-PEX take axial load and locate the shaft?", "a": "The high-capacity NCF ECJB execution is the non-locating partner in the NUH/NCF pair and should float axially." }, { "q": "How does NCF2244-ECJB-PEX compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NCF2244-ECJB", "equiv_brand": "SKF", "level": "partial", "note": "Same ISO 15 envelope 220×400×108 mm, but catalogue C/C0 ratings differ between executions (2000/2600 vs 1760/2600 kN) and the NCF flange/ring configuration differs — envelope match, not a load-rating equivalent." }, { "equiv_sku": "NUH2244-ECMH", "equiv_brand": "SKF", "level": "partial", "note": "Same ISO 15 envelope 220×400×108 mm, but catalogue C/C0 ratings differ between executions (2000/2600 vs 1760/2600 kN) and the NUH flange/ring configuration differs — envelope match, not a load-rating equivalent." }, { "equiv_sku": "NUH2244-ECMH-PEX", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 220×400×108 mm and equivalent catalogue ratings; the NUH execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.2 high-capacity cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2244-ECJB-PEX", "SKF NCF 2244 ECJB/PEX" ], "locale_variants": {} }, { "sku": "NCF2244-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 2244 V", "series": "NCF2200-series", "type": "cylindrical_roller", "d_mm": 220, "D_mm": 400, "B_mm": 108, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1830, "static_load_kN": 2750, "fatigue_load_limit_kN": 255, "max_rpm": 850, "reference_speed_rpm": 700, "limiting_speed_rpm": 850, "weight_g": 58000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NCF 2244 V resolves to a 220×400×108 mm single-row full-complement cylindrical roller bearing (dimension series 22 (light-section, wide)); a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The radial section height is 90.0 mm and the catalogue mass 58000 g; at 1830 kN dynamic rating this is roughly 8.32 kN of C per millimetre of bore before application factors. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 220 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts", "heavy offshore winch drums" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 850 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 400 mm raceway.", "The 1830/2750 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2244-V?", "a": "SKF NCF 2244 V is a single-row full-complement cylindrical roller bearing with 220 mm bore, 400 mm OD and 108 mm width per ISO 15. SKF lists C 1830 kN, C0 2750 kN, Pu 255 kN, reference speed 700 r/min and limiting speed 850 r/min, mass about 58000 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF2244-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF2244-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF2244", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2244-V", "SKF NCF 2244 V" ], "locale_variants": {} }, { "sku": "NCF2326-ECJB", "brand": "SKF", "manufacturer_designation": "SKF NCF 2326 ECJB", "series": "NCF2300-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 280, "B_mm": 93, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1120, "static_load_kN": 1340, "fatigue_load_limit_kN": 146, "max_rpm": 3400, "reference_speed_rpm": 2400, "limiting_speed_rpm": 3400, "weight_g": 29000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 130 mm shaft, SKF lists NCF2326-ECJB as high-capacity cylindrical roller: 280 mm OD, 93 mm wide, Pu 146 kN, the catalogue lists 2,400 r/min thermal reference speed and 3,400 r/min mechanical limiting speed. Structurally, the NCF design has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope. In arrangement terms it is the non-locating member of the paired high-capacity arrangement, absorbing axial displacement while carrying the full high radial rating. The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. The radial section height is 75.0 mm and the catalogue mass 29000 g; at 1120 kN dynamic rating this is roughly 8.62 kN of C per millimetre of bore before application factors. Fit practice for NCF2326-ECJB: used opposite the NUH locating bearing on wind-gearbox and heavy industrial pinion shafts; fit the inner ring with interference and let this bearing float axially. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment. This is the standard catalogue execution of the high-capacity design. Selected sizes in the range are also produced as /PEX pinion-shaft builds for wind-turbine gearboxes — separate order numbers with their own rating lines and internal profiling; the two must not be mixed using one another’s loads.", "applications": [ "large mining mill pinion shafts", "multi-megawatt wind turbine main gearboxes", "offshore and marine heavy drive trains" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "micro-pitting on the profiled rollers under contaminated or starved-lubricant conditions despite the black-oxide treatment", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "cage fatigue in heavily reversing wind-turbine load cycles when relubrication intervals are exceeded", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "High-capacity NUH and NCF bearings are designed as a locating/non-locating PAIR on the same shaft; fitting two locating NUH bearings can preload the arrangement thermally.", "The /PEX pinion execution carries its own rating line and internal geometry — never substitute a standard NCF 2326 using the /PEX loads.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 93 mm-wide ring and concentrates load.", "The 1120/1340 kN ratings are SKF catalogue 17000 (2018) values for the ECJB execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2326-ECJB?", "a": "SKF NCF 2326 ECJB is a high-capacity cylindrical roller bearing with 130 mm bore, 280 mm OD and 93 mm width per ISO 15. SKF lists C 1120 kN, C0 1340 kN, Pu 146 kN, reference speed 2,400 r/min and limiting speed 3,400 r/min, mass about 29000 g." }, { "q": "What does the NCF designation and ECJB suffix mean?", "a": "The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Structurally this execution has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope." }, { "q": "Can NCF2326-ECJB take axial load and locate the shaft?", "a": "The high-capacity NCF ECJB execution is the non-locating partner in the NUH/NCF pair and should float axially." }, { "q": "How does NCF2326-ECJB compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NUH2326-ECMH", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 130×280×93 mm and equivalent catalogue ratings; the NUH execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.2 high-capacity cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2326-ECJB", "SKF NCF 2326 ECJB" ], "locale_variants": {} }, { "sku": "NCF2328-ECJB", "brand": "SKF", "manufacturer_designation": "SKF NCF 2328 ECJB", "series": "NCF2300-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 300, "B_mm": 102, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1250, "static_load_kN": 1530, "fatigue_load_limit_kN": 163, "max_rpm": 3200, "reference_speed_rpm": 2400, "limiting_speed_rpm": 3200, "weight_g": 35500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 2328 ECJB denotes a high-capacity cylindrical roller bearing on the ISO 15 140×300×102 mm envelope, dimension series 23 (medium-section, wide), with catalogue mass 35500 g. The NCF configuration means the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope; functionally the bearing is the non-locating member of the paired high-capacity arrangement, absorbing axial displacement while carrying the full high radial rating. The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Speed planning for NCF2328-ECJB: the catalogue lists 2,400 r/min thermal reference speed and 3,200 r/min mechanical limiting speed. The mass entry 35500 g covers the complete catalogue execution. Fit practice for NCF2328-ECJB: used opposite the NUH locating bearing on wind-gearbox and heavy industrial pinion shafts; fit the inner ring with interference and let this bearing float axially. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment. This is the standard catalogue execution of the high-capacity design. Selected sizes in the range are also produced as /PEX pinion-shaft builds for wind-turbine gearboxes — separate order numbers with their own rating lines and internal profiling; the two must not be mixed using one another’s loads.", "applications": [ "multi-megawatt wind turbine main gearboxes", "offshore and marine heavy drive trains", "large mining mill pinion shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "micro-pitting on the profiled rollers under contaminated or starved-lubricant conditions despite the black-oxide treatment", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "cage fatigue in heavily reversing wind-turbine load cycles when relubrication intervals are exceeded", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "High-capacity NUH and NCF bearings are designed as a locating/non-locating PAIR on the same shaft; fitting two locating NUH bearings can preload the arrangement thermally.", "The /PEX pinion execution carries its own rating line and internal geometry — never substitute a standard NCF 2328 using the /PEX loads.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 300 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 102 mm-wide ring and concentrates load.", "The 1250/1530 kN ratings are SKF catalogue 17000 (2018) values for the ECJB execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2328-ECJB?", "a": "SKF NCF 2328 ECJB is a high-capacity cylindrical roller bearing with 140 mm bore, 300 mm OD and 102 mm width per ISO 15. SKF lists C 1250 kN, C0 1530 kN, Pu 163 kN, reference speed 2,400 r/min and limiting speed 3,200 r/min, mass about 35500 g." }, { "q": "What does the NCF designation and ECJB suffix mean?", "a": "The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Structurally this execution has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope." }, { "q": "Can NCF2328-ECJB take axial load and locate the shaft?", "a": "The high-capacity NCF ECJB execution is the non-locating partner in the NUH/NCF pair and should float axially." }, { "q": "How does NCF2328-ECJB compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NUH2328-ECMH", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 140×300×102 mm and equivalent catalogue ratings; the NUH execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.2 high-capacity cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2328-ECJB", "SKF NCF 2328 ECJB" ], "locale_variants": {} }, { "sku": "NCF2330-ECJB", "brand": "SKF", "manufacturer_designation": "SKF NCF 2330 ECJB", "series": "NCF2300-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 320, "B_mm": 108, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1430, "static_load_kN": 1760, "fatigue_load_limit_kN": 183, "max_rpm": 3000, "reference_speed_rpm": 2200, "limiting_speed_rpm": 3000, "weight_g": 43500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 2330 ECJB denotes a high-capacity cylindrical roller bearing on the ISO 15 150×320×108 mm envelope, dimension series 23 (medium-section, wide), with catalogue mass 43500 g. Structurally, the NCF design has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope. In arrangement terms it is the non-locating member of the paired high-capacity arrangement, absorbing axial displacement while carrying the full high radial rating. The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Speed planning for NCF2330-ECJB: the catalogue lists 2,200 r/min thermal reference speed and 3,000 r/min mechanical limiting speed. The mass entry 43500 g covers the complete catalogue execution. Fit practice for NCF2330-ECJB: used opposite the NUH locating bearing on wind-gearbox and heavy industrial pinion shafts; fit the inner ring with interference and let this bearing float axially. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment. This is the standard catalogue execution of the high-capacity design. Selected sizes in the range are also produced as /PEX pinion-shaft builds for wind-turbine gearboxes — separate order numbers with their own rating lines and internal profiling; the two must not be mixed using one another’s loads.", "applications": [ "large mining mill pinion shafts", "multi-megawatt wind turbine main gearboxes", "offshore and marine heavy drive trains" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "micro-pitting on the profiled rollers under contaminated or starved-lubricant conditions despite the black-oxide treatment", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "cage fatigue in heavily reversing wind-turbine load cycles when relubrication intervals are exceeded", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "High-capacity NUH and NCF bearings are designed as a locating/non-locating PAIR on the same shaft; fitting two locating NUH bearings can preload the arrangement thermally.", "The /PEX pinion execution carries its own rating line and internal geometry — never substitute a standard NCF 2330 using the /PEX loads.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 108 mm-wide ring and concentrates load.", "The 1430/1760 kN ratings are SKF catalogue 17000 (2018) values for the ECJB execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2330-ECJB?", "a": "SKF NCF 2330 ECJB is a high-capacity cylindrical roller bearing with 150 mm bore, 320 mm OD and 108 mm width per ISO 15. SKF lists C 1430 kN, C0 1760 kN, Pu 183 kN, reference speed 2,200 r/min and limiting speed 3,000 r/min, mass about 43500 g." }, { "q": "What does the NCF designation and ECJB suffix mean?", "a": "The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Structurally this execution has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope." }, { "q": "Can NCF2330-ECJB take axial load and locate the shaft?", "a": "The high-capacity NCF ECJB execution is the non-locating partner in the NUH/NCF pair and should float axially." }, { "q": "How does NCF2330-ECJB compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NUH2330-ECMH", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 150×320×108 mm and equivalent catalogue ratings; the NUH execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.2 high-capacity cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2330-ECJB", "SKF NCF 2330 ECJB" ], "locale_variants": {} }, { "sku": "NCF2332-ECJB", "brand": "SKF", "manufacturer_designation": "SKF NCF 2332 ECJB", "series": "NCF2300-series", "type": "cylindrical_roller", "d_mm": 160, "D_mm": 340, "B_mm": 114, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1400, "static_load_kN": 2000, "fatigue_load_limit_kN": 196, "max_rpm": 2800, "reference_speed_rpm": 1800, "limiting_speed_rpm": 2800, "weight_g": 50500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NCF2332-ECJB is the 160 mm bore entry in the NCF2300 range: a 160×340×114 mm high-capacity cylindrical roller bearing with a pressed sheet-steel window-type cage, rated C 1400 kN / C0 2000 kN. The NCF configuration means the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope; functionally the bearing is the non-locating member of the paired high-capacity arrangement, absorbing axial displacement while carrying the full high radial rating. Reading the order-string suffix ECJB: the high-capacity execution with pressed-steel cages (the /PEX mark denotes the pinion-shaft special build with its own catalogue rating line). Load-per-bore for the 160 mm seat is about 8.75 kN/mm, typical of dimension series 23 (medium-section, wide); use C0 2000 kN for static checks such as crane hook blocks standing under load. Mounting: used opposite the NUH locating bearing on wind-gearbox and heavy industrial pinion shafts; fit the inner ring with interference and let this bearing float axially. A 160 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates. This is the standard catalogue execution of the high-capacity design. Selected sizes in the range are also produced as /PEX pinion-shaft builds for wind-turbine gearboxes — separate order numbers with their own rating lines and internal profiling; the two must not be mixed using one another’s loads.", "applications": [ "large mining mill pinion shafts", "multi-megawatt wind turbine main gearboxes", "offshore and marine heavy drive trains" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "micro-pitting on the profiled rollers under contaminated or starved-lubricant conditions despite the black-oxide treatment", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "cage fatigue in heavily reversing wind-turbine load cycles when relubrication intervals are exceeded", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "High-capacity NUH and NCF bearings are designed as a locating/non-locating PAIR on the same shaft; fitting two locating NUH bearings can preload the arrangement thermally.", "The /PEX pinion execution carries its own rating line and internal geometry — never substitute a standard NCF 2332 using the /PEX loads.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 340 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 1400/2000 kN ratings are SKF catalogue 17000 (2018) values for the ECJB execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2332-ECJB?", "a": "SKF NCF 2332 ECJB is a high-capacity cylindrical roller bearing with 160 mm bore, 340 mm OD and 114 mm width per ISO 15. SKF lists C 1400 kN, C0 2000 kN, Pu 196 kN, reference speed 1,800 r/min and limiting speed 2,800 r/min, mass about 50500 g." }, { "q": "What does the NCF designation and ECJB suffix mean?", "a": "The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Structurally this execution has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope." }, { "q": "Can NCF2332-ECJB take axial load and locate the shaft?", "a": "The high-capacity NCF ECJB execution is the non-locating partner in the NUH/NCF pair and should float axially." }, { "q": "How does NCF2332-ECJB compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NCF2332-ECJB-PEX", "equiv_brand": "SKF", "level": "partial", "note": "Same ISO 15 envelope 160×340×114 mm, but catalogue C/C0 ratings differ between executions (1400/2000 vs 1600/2000 kN) and the NCF flange/ring configuration differs — envelope match, not a load-rating equivalent." }, { "equiv_sku": "NUH2332-ECMH", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 160×340×114 mm and equivalent catalogue ratings; the NUH execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUH2332-ECMH-PEX", "equiv_brand": "SKF", "level": "partial", "note": "Same ISO 15 envelope 160×340×114 mm, but catalogue C/C0 ratings differ between executions (1400/2000 vs 1600/2000 kN) and the NUH flange/ring configuration differs — envelope match, not a load-rating equivalent." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.2 high-capacity cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2332-ECJB", "SKF NCF 2332 ECJB" ], "locale_variants": {} }, { "sku": "NCF2332-ECJB-PEX", "brand": "SKF", "manufacturer_designation": "SKF NCF 2332 ECJB/PEX", "series": "NCF2300-series", "type": "cylindrical_roller", "d_mm": 160, "D_mm": 340, "B_mm": 114, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1600, "static_load_kN": 2000, "fatigue_load_limit_kN": 196, "max_rpm": 2800, "reference_speed_rpm": 2000, "limiting_speed_rpm": 2800, "weight_g": 50500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 160 mm shaft, SKF lists NCF2332-ECJB-PEX as high-capacity cylindrical roller: 340 mm OD, 114 mm wide, Pu 196 kN, the catalogue lists 2,000 r/min thermal reference speed and 2,800 r/min mechanical limiting speed. Reading the NCF prefix: the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope. This makes the execution the non-locating member of the paired high-capacity arrangement, absorbing axial displacement while carrying the full high radial rating. The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Selection arithmetic: C0/C ≈ 1.25 (2000 against 1600 kN), and the Pu figure 196 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 2,000 r/min thermal reference speed and 2,800 r/min mechanical limiting speed. Assembly note: used opposite the NUH locating bearing on wind-gearbox and heavy industrial pinion shafts; fit the inner ring with interference and let this bearing float axially. Heat steel rings inductively to max 120 °C. The /PEX mark identifies the pinion-shaft build: it is the execution developed for the pinion position in wind-turbine and heavy industrial gearboxes, and SKF publishes its own rating line (C 1600 kN / C0 2000 kN here) because the roller complement and internal profiling differ from the standard execution. Treat NCF2332-ECJB-PEX as a separate service part: do not substitute the standard NCF 2332 bearing against the /PEX loads, and refit pinion arrangements with the same /PEX order number to preserve the calculated L10 and peak-torque margin.", "applications": [ "multi-megawatt wind turbine main gearboxes", "offshore and marine heavy drive trains", "large mining mill pinion shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "micro-pitting on the profiled rollers under contaminated or starved-lubricant conditions despite the black-oxide treatment", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "cage fatigue in heavily reversing wind-turbine load cycles when relubrication intervals are exceeded", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "High-capacity NUH and NCF bearings are designed as a locating/non-locating PAIR on the same shaft; fitting two locating NUH bearings can preload the arrangement thermally.", "The /PEX pinion build and the standard NCF 2332 bearing are separate service parts with different internal profiling and rating lines; replacing the /PEX part with the standard execution silently erases the peak-torque margin the gearbox was designed for.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 114 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 1600/2000 kN ratings are SKF catalogue 17000 (2018) values for the ECJB/PEX execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2332-ECJB-PEX?", "a": "SKF NCF 2332 ECJB/PEX is a high-capacity cylindrical roller bearing with 160 mm bore, 340 mm OD and 114 mm width per ISO 15. SKF lists C 1600 kN, C0 2000 kN, Pu 196 kN, reference speed 2,000 r/min and limiting speed 2,800 r/min, mass about 50500 g." }, { "q": "What does the NCF designation and ECJB/PEX suffix mean?", "a": "The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Structurally this execution has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope." }, { "q": "Can NCF2332-ECJB-PEX take axial load and locate the shaft?", "a": "The high-capacity NCF ECJB execution is the non-locating partner in the NUH/NCF pair and should float axially." }, { "q": "How does NCF2332-ECJB-PEX compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NCF2332-ECJB", "equiv_brand": "SKF", "level": "partial", "note": "Same ISO 15 envelope 160×340×114 mm, but catalogue C/C0 ratings differ between executions (1600/2000 vs 1400/2000 kN) and the NCF flange/ring configuration differs — envelope match, not a load-rating equivalent." }, { "equiv_sku": "NUH2332-ECMH", "equiv_brand": "SKF", "level": "partial", "note": "Same ISO 15 envelope 160×340×114 mm, but catalogue C/C0 ratings differ between executions (1600/2000 vs 1400/2000 kN) and the NUH flange/ring configuration differs — envelope match, not a load-rating equivalent." }, { "equiv_sku": "NUH2332-ECMH-PEX", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 160×340×114 mm and equivalent catalogue ratings; the NUH execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.2 high-capacity cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2332-ECJB-PEX", "SKF NCF 2332 ECJB/PEX" ], "locale_variants": {} }, { "sku": "NCF2334-ECJB", "brand": "SKF", "manufacturer_designation": "SKF NCF 2334 ECJB", "series": "NCF2300-series", "type": "cylindrical_roller", "d_mm": 170, "D_mm": 360, "B_mm": 120, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1540, "static_load_kN": 2200, "fatigue_load_limit_kN": 216, "max_rpm": 2600, "reference_speed_rpm": 1700, "limiting_speed_rpm": 2600, "weight_g": 58500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NCF 2334 ECJB is a high-capacity cylindrical roller bearing sized 170×360×120 mm — a dimension series 23 (medium-section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.2. Reading the NCF prefix: the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope. This makes the execution the non-locating member of the paired high-capacity arrangement, absorbing axial displacement while carrying the full high radial rating. Reading the order-string suffix ECJB: the high-capacity execution with pressed-steel cages (the /PEX mark denotes the pinion-shaft special build with its own catalogue rating line). The radial section height is 95.0 mm and the catalogue mass 58500 g; at 1540 kN dynamic rating this is roughly 9.06 kN of C per millimetre of bore before application factors. Mounting: used opposite the NUH locating bearing on wind-gearbox and heavy industrial pinion shafts; fit the inner ring with interference and let this bearing float axially. A 170 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates. This is the standard catalogue execution of the high-capacity design. Selected sizes in the range are also produced as /PEX pinion-shaft builds for wind-turbine gearboxes — separate order numbers with their own rating lines and internal profiling; the two must not be mixed using one another’s loads.", "applications": [ "multi-megawatt wind turbine main gearboxes", "offshore and marine heavy drive trains", "large mining mill pinion shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "micro-pitting on the profiled rollers under contaminated or starved-lubricant conditions despite the black-oxide treatment", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "cage fatigue in heavily reversing wind-turbine load cycles when relubrication intervals are exceeded", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "High-capacity NUH and NCF bearings are designed as a locating/non-locating PAIR on the same shaft; fitting two locating NUH bearings can preload the arrangement thermally.", "The /PEX pinion execution carries its own rating line and internal geometry — never substitute a standard NCF 2334 using the /PEX loads.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 120 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 1540/2200 kN ratings are SKF catalogue 17000 (2018) values for the ECJB execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2334-ECJB?", "a": "SKF NCF 2334 ECJB is a high-capacity cylindrical roller bearing with 170 mm bore, 360 mm OD and 120 mm width per ISO 15. SKF lists C 1540 kN, C0 2200 kN, Pu 216 kN, reference speed 1,700 r/min and limiting speed 2,600 r/min, mass about 58500 g." }, { "q": "What does the NCF designation and ECJB suffix mean?", "a": "The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Structurally this execution has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope." }, { "q": "Can NCF2334-ECJB take axial load and locate the shaft?", "a": "The high-capacity NCF ECJB execution is the non-locating partner in the NUH/NCF pair and should float axially." }, { "q": "How does NCF2334-ECJB compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NCF2334-ECJB-PEX", "equiv_brand": "SKF", "level": "partial", "note": "Same ISO 15 envelope 170×360×120 mm, but catalogue C/C0 ratings differ between executions (1540/2200 vs 1760/2200 kN) and the NCF flange/ring configuration differs — envelope match, not a load-rating equivalent." }, { "equiv_sku": "NUH2334-ECMH", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 170×360×120 mm and equivalent catalogue ratings; the NUH execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUH2334-ECMH-PEX", "equiv_brand": "SKF", "level": "partial", "note": "Same ISO 15 envelope 170×360×120 mm, but catalogue C/C0 ratings differ between executions (1540/2200 vs 1760/2200 kN) and the NUH flange/ring configuration differs — envelope match, not a load-rating equivalent." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.2 high-capacity cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2334-ECJB", "SKF NCF 2334 ECJB" ], "locale_variants": {} }, { "sku": "NCF2334-ECJB-PEX", "brand": "SKF", "manufacturer_designation": "SKF NCF 2334 ECJB/PEX", "series": "NCF2300-series", "type": "cylindrical_roller", "d_mm": 170, "D_mm": 360, "B_mm": 120, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1760, "static_load_kN": 2200, "fatigue_load_limit_kN": 216, "max_rpm": 2600, "reference_speed_rpm": 1900, "limiting_speed_rpm": 2600, "weight_g": 58500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 2334 ECJB/PEX denotes a high-capacity cylindrical roller bearing on the ISO 15 170×360×120 mm envelope, dimension series 23 (medium-section, wide), with catalogue mass 58500 g. Reading the NCF prefix: the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope. This makes the execution the non-locating member of the paired high-capacity arrangement, absorbing axial displacement while carrying the full high radial rating. The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. The radial section height is 95.0 mm and the catalogue mass 58500 g; at 1760 kN dynamic rating this is roughly 10.35 kN of C per millimetre of bore before application factors. Assembly note: used opposite the NUH locating bearing on wind-gearbox and heavy industrial pinion shafts; fit the inner ring with interference and let this bearing float axially. Heat steel rings inductively to max 120 °C. The /PEX mark identifies the pinion-shaft build: it is the execution developed for the pinion position in wind-turbine and heavy industrial gearboxes, and SKF publishes its own rating line (C 1760 kN / C0 2200 kN here) because the roller complement and internal profiling differ from the standard execution. Treat NCF2334-ECJB-PEX as a separate service part: do not substitute the standard NCF 2334 bearing against the /PEX loads, and refit pinion arrangements with the same /PEX order number to preserve the calculated L10 and peak-torque margin.", "applications": [ "multi-megawatt wind turbine main gearboxes", "offshore and marine heavy drive trains", "large mining mill pinion shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "micro-pitting on the profiled rollers under contaminated or starved-lubricant conditions despite the black-oxide treatment", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "cage fatigue in heavily reversing wind-turbine load cycles when relubrication intervals are exceeded", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "High-capacity NUH and NCF bearings are designed as a locating/non-locating PAIR on the same shaft; fitting two locating NUH bearings can preload the arrangement thermally.", "The /PEX pinion build and the standard NCF 2334 bearing are separate service parts with different internal profiling and rating lines; replacing the /PEX part with the standard execution silently erases the peak-torque margin the gearbox was designed for.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 120 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 1760/2200 kN ratings are SKF catalogue 17000 (2018) values for the ECJB/PEX execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2334-ECJB-PEX?", "a": "SKF NCF 2334 ECJB/PEX is a high-capacity cylindrical roller bearing with 170 mm bore, 360 mm OD and 120 mm width per ISO 15. SKF lists C 1760 kN, C0 2200 kN, Pu 216 kN, reference speed 1,900 r/min and limiting speed 2,600 r/min, mass about 58500 g." }, { "q": "What does the NCF designation and ECJB/PEX suffix mean?", "a": "The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Structurally this execution has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope." }, { "q": "Can NCF2334-ECJB-PEX take axial load and locate the shaft?", "a": "The high-capacity NCF ECJB execution is the non-locating partner in the NUH/NCF pair and should float axially." }, { "q": "How does NCF2334-ECJB-PEX compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NCF2334-ECJB", "equiv_brand": "SKF", "level": "partial", "note": "Same ISO 15 envelope 170×360×120 mm, but catalogue C/C0 ratings differ between executions (1760/2200 vs 1540/2200 kN) and the NCF flange/ring configuration differs — envelope match, not a load-rating equivalent." }, { "equiv_sku": "NUH2334-ECMH", "equiv_brand": "SKF", "level": "partial", "note": "Same ISO 15 envelope 170×360×120 mm, but catalogue C/C0 ratings differ between executions (1760/2200 vs 1540/2200 kN) and the NUH flange/ring configuration differs — envelope match, not a load-rating equivalent." }, { "equiv_sku": "NUH2334-ECMH-PEX", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 170×360×120 mm and equivalent catalogue ratings; the NUH execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.2 high-capacity cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2334-ECJB-PEX", "SKF NCF 2334 ECJB/PEX" ], "locale_variants": {} }, { "sku": "NCF2336-ECJB", "brand": "SKF", "manufacturer_designation": "SKF NCF 2336 ECJB", "series": "NCF2300-series", "type": "cylindrical_roller", "d_mm": 180, "D_mm": 380, "B_mm": 126, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1720, "static_load_kN": 2400, "fatigue_load_limit_kN": 232, "max_rpm": 2400, "reference_speed_rpm": 1600, "limiting_speed_rpm": 2400, "weight_g": 67500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NCF2336-ECJB is the 180 mm bore entry in the NCF2300 range: a 180×380×126 mm high-capacity cylindrical roller bearing with a pressed sheet-steel window-type cage, rated C 1720 kN / C0 2400 kN. Structurally, the NCF design has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope. In arrangement terms it is the non-locating member of the paired high-capacity arrangement, absorbing axial displacement while carrying the full high radial rating. The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. The pressed sheet-steel window-type cage is reflected in the published speeds and temperature limits. Speed planning for NCF2336-ECJB: the catalogue lists 1,600 r/min thermal reference speed and 2,400 r/min mechanical limiting speed. The mass entry 67500 g covers the complete catalogue execution. Fit practice for NCF2336-ECJB: used opposite the NUH locating bearing on wind-gearbox and heavy industrial pinion shafts; fit the inner ring with interference and let this bearing float axially. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment. This is the standard catalogue execution of the high-capacity design. Selected sizes in the range are also produced as /PEX pinion-shaft builds for wind-turbine gearboxes — separate order numbers with their own rating lines and internal profiling; the two must not be mixed using one another’s loads.", "applications": [ "offshore and marine heavy drive trains", "large mining mill pinion shafts", "multi-megawatt wind turbine main gearboxes" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "micro-pitting on the profiled rollers under contaminated or starved-lubricant conditions despite the black-oxide treatment", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "cage fatigue in heavily reversing wind-turbine load cycles when relubrication intervals are exceeded", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "High-capacity NUH and NCF bearings are designed as a locating/non-locating PAIR on the same shaft; fitting two locating NUH bearings can preload the arrangement thermally.", "The /PEX pinion execution carries its own rating line and internal geometry — never substitute a standard NCF 2336 using the /PEX loads.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 1720/2400 kN ratings are SKF catalogue 17000 (2018) values for the ECJB execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2336-ECJB?", "a": "SKF NCF 2336 ECJB is a high-capacity cylindrical roller bearing with 180 mm bore, 380 mm OD and 126 mm width per ISO 15. SKF lists C 1720 kN, C0 2400 kN, Pu 232 kN, reference speed 1,600 r/min and limiting speed 2,400 r/min, mass about 67500 g." }, { "q": "What does the NCF designation and ECJB suffix mean?", "a": "The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Structurally this execution has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope." }, { "q": "Can NCF2336-ECJB take axial load and locate the shaft?", "a": "The high-capacity NCF ECJB execution is the non-locating partner in the NUH/NCF pair and should float axially." }, { "q": "How does NCF2336-ECJB compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NCF2336-ECJB-PEX", "equiv_brand": "SKF", "level": "partial", "note": "Same ISO 15 envelope 180×380×126 mm, but catalogue C/C0 ratings differ between executions (1720/2400 vs 1960/2400 kN) and the NCF flange/ring configuration differs — envelope match, not a load-rating equivalent." }, { "equiv_sku": "NUH2336-ECMH", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 180×380×126 mm and equivalent catalogue ratings; the NUH execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUH2336-ECMH-PEX", "equiv_brand": "SKF", "level": "partial", "note": "Same ISO 15 envelope 180×380×126 mm, but catalogue C/C0 ratings differ between executions (1720/2400 vs 1960/2400 kN) and the NUH flange/ring configuration differs — envelope match, not a load-rating equivalent." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.2 high-capacity cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2336-ECJB", "SKF NCF 2336 ECJB" ], "locale_variants": {} }, { "sku": "NCF2336-ECJB-PEX", "brand": "SKF", "manufacturer_designation": "SKF NCF 2336 ECJB/PEX", "series": "NCF2300-series", "type": "cylindrical_roller", "d_mm": 180, "D_mm": 380, "B_mm": 126, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1960, "static_load_kN": 2400, "fatigue_load_limit_kN": 232, "max_rpm": 2400, "reference_speed_rpm": 1800, "limiting_speed_rpm": 2400, "weight_g": 67500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 180 mm shaft, SKF lists NCF2336-ECJB-PEX as high-capacity cylindrical roller: 380 mm OD, 126 mm wide, Pu 232 kN, the catalogue lists 1,800 r/min thermal reference speed and 2,400 r/min mechanical limiting speed. Reading the NCF prefix: the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope. This makes the execution the non-locating member of the paired high-capacity arrangement, absorbing axial displacement while carrying the full high radial rating. Reading the order-string suffix ECJB/PEX: the high-capacity execution with pressed-steel cages (the /PEX mark denotes the pinion-shaft special build with its own catalogue rating line). With C 1960 kN and C0 2400 kN, size the bearing on the 180×380 mm ISO 15 envelope and check the 232 kN Pu against the equivalent-load floor; the catalogue lists 1,800 r/min thermal reference speed and 2,400 r/min mechanical limiting speed. Mounting: used opposite the NUH locating bearing on wind-gearbox and heavy industrial pinion shafts; fit the inner ring with interference and let this bearing float axially. A 180 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates. The /PEX mark identifies the pinion-shaft build: it is the execution developed for the pinion position in wind-turbine and heavy industrial gearboxes, and SKF publishes its own rating line (C 1960 kN / C0 2400 kN here) because the roller complement and internal profiling differ from the standard execution. Treat NCF2336-ECJB-PEX as a separate service part: do not substitute the standard NCF 2336 bearing against the /PEX loads, and refit pinion arrangements with the same /PEX order number to preserve the calculated L10 and peak-torque margin.", "applications": [ "multi-megawatt wind turbine main gearboxes", "offshore and marine heavy drive trains", "large mining mill pinion shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "micro-pitting on the profiled rollers under contaminated or starved-lubricant conditions despite the black-oxide treatment", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "cage fatigue in heavily reversing wind-turbine load cycles when relubrication intervals are exceeded", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "High-capacity NUH and NCF bearings are designed as a locating/non-locating PAIR on the same shaft; fitting two locating NUH bearings can preload the arrangement thermally.", "The /PEX pinion build and the standard NCF 2336 bearing are separate service parts with different internal profiling and rating lines; replacing the /PEX part with the standard execution silently erases the peak-torque margin the gearbox was designed for.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 126 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 1960/2400 kN ratings are SKF catalogue 17000 (2018) values for the ECJB/PEX execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2336-ECJB-PEX?", "a": "SKF NCF 2336 ECJB/PEX is a high-capacity cylindrical roller bearing with 180 mm bore, 380 mm OD and 126 mm width per ISO 15. SKF lists C 1960 kN, C0 2400 kN, Pu 232 kN, reference speed 1,800 r/min and limiting speed 2,400 r/min, mass about 67500 g." }, { "q": "What does the NCF designation and ECJB/PEX suffix mean?", "a": "The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Structurally this execution has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope." }, { "q": "Can NCF2336-ECJB-PEX take axial load and locate the shaft?", "a": "The high-capacity NCF ECJB execution is the non-locating partner in the NUH/NCF pair and should float axially." }, { "q": "How does NCF2336-ECJB-PEX compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NCF2336-ECJB", "equiv_brand": "SKF", "level": "partial", "note": "Same ISO 15 envelope 180×380×126 mm, but catalogue C/C0 ratings differ between executions (1960/2400 vs 1720/2400 kN) and the NCF flange/ring configuration differs — envelope match, not a load-rating equivalent." }, { "equiv_sku": "NUH2336-ECMH", "equiv_brand": "SKF", "level": "partial", "note": "Same ISO 15 envelope 180×380×126 mm, but catalogue C/C0 ratings differ between executions (1960/2400 vs 1720/2400 kN) and the NUH flange/ring configuration differs — envelope match, not a load-rating equivalent." }, { "equiv_sku": "NUH2336-ECMH-PEX", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 180×380×126 mm and equivalent catalogue ratings; the NUH execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.2 high-capacity cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2336-ECJB-PEX", "SKF NCF 2336 ECJB/PEX" ], "locale_variants": {} }, { "sku": "NCF2338-ECJB", "brand": "SKF", "manufacturer_designation": "SKF NCF 2338 ECJB", "series": "NCF2300-series", "type": "cylindrical_roller", "d_mm": 190, "D_mm": 400, "B_mm": 132, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 1940, "static_load_kN": 2750, "fatigue_load_limit_kN": 255, "max_rpm": 2200, "reference_speed_rpm": 1500, "limiting_speed_rpm": 2200, "weight_g": 78000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NCF 2338 ECJB is a high-capacity cylindrical roller bearing sized 190×400×132 mm — a dimension series 23 (medium-section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.2. The NCF configuration means the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope; functionally the bearing is the non-locating member of the paired high-capacity arrangement, absorbing axial displacement while carrying the full high radial rating. The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Load-per-bore for the 190 mm seat is about 10.21 kN/mm, typical of dimension series 23 (medium-section, wide); use C0 2750 kN for static checks such as crane hook blocks standing under load. Mounting: used opposite the NUH locating bearing on wind-gearbox and heavy industrial pinion shafts; fit the inner ring with interference and let this bearing float axially. A 190 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates. This is the standard catalogue execution of the high-capacity design. Selected sizes in the range are also produced as /PEX pinion-shaft builds for wind-turbine gearboxes — separate order numbers with their own rating lines and internal profiling; the two must not be mixed using one another’s loads.", "applications": [ "offshore and marine heavy drive trains", "large mining mill pinion shafts", "multi-megawatt wind turbine main gearboxes" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "micro-pitting on the profiled rollers under contaminated or starved-lubricant conditions despite the black-oxide treatment", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "cage fatigue in heavily reversing wind-turbine load cycles when relubrication intervals are exceeded", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "High-capacity NUH and NCF bearings are designed as a locating/non-locating PAIR on the same shaft; fitting two locating NUH bearings can preload the arrangement thermally.", "The /PEX pinion execution carries its own rating line and internal geometry — never substitute a standard NCF 2338 using the /PEX loads.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 400 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 400 mm raceway.", "The 1940/2750 kN ratings are SKF catalogue 17000 (2018) values for the ECJB execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2338-ECJB?", "a": "SKF NCF 2338 ECJB is a high-capacity cylindrical roller bearing with 190 mm bore, 400 mm OD and 132 mm width per ISO 15. SKF lists C 1940 kN, C0 2750 kN, Pu 255 kN, reference speed 1,500 r/min and limiting speed 2,200 r/min, mass about 78000 g." }, { "q": "What does the NCF designation and ECJB suffix mean?", "a": "The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Structurally this execution has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope." }, { "q": "Can NCF2338-ECJB take axial load and locate the shaft?", "a": "The high-capacity NCF ECJB execution is the non-locating partner in the NUH/NCF pair and should float axially." }, { "q": "How does NCF2338-ECJB compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NCF2338-ECJB-PEX", "equiv_brand": "SKF", "level": "partial", "note": "Same ISO 15 envelope 190×400×132 mm, but catalogue C/C0 ratings differ between executions (1940/2750 vs 2240/2750 kN) and the NCF flange/ring configuration differs — envelope match, not a load-rating equivalent." }, { "equiv_sku": "NUH2338-ECMH", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 190×400×132 mm and equivalent catalogue ratings; the NUH execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUH2338-ECMH-PEX", "equiv_brand": "SKF", "level": "partial", "note": "Same ISO 15 envelope 190×400×132 mm, but catalogue C/C0 ratings differ between executions (1940/2750 vs 2240/2750 kN) and the NUH flange/ring configuration differs — envelope match, not a load-rating equivalent." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.2 high-capacity cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2338-ECJB", "SKF NCF 2338 ECJB" ], "locale_variants": {} }, { "sku": "NCF2338-ECJB-PEX", "brand": "SKF", "manufacturer_designation": "SKF NCF 2338 ECJB/PEX", "series": "NCF2300-series", "type": "cylindrical_roller", "d_mm": 190, "D_mm": 400, "B_mm": 132, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2240, "static_load_kN": 2750, "fatigue_load_limit_kN": 255, "max_rpm": 2200, "reference_speed_rpm": 1700, "limiting_speed_rpm": 2200, "weight_g": 78000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 2338 ECJB/PEX denotes a high-capacity cylindrical roller bearing on the ISO 15 190×400×132 mm envelope, dimension series 23 (medium-section, wide), with catalogue mass 78000 g. The NCF configuration means the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope; functionally the bearing is the non-locating member of the paired high-capacity arrangement, absorbing axial displacement while carrying the full high radial rating. Reading the order-string suffix ECJB/PEX: the high-capacity execution with pressed-steel cages (the /PEX mark denotes the pinion-shaft special build with its own catalogue rating line). With C 2240 kN and C0 2750 kN, size the bearing on the 190×400 mm ISO 15 envelope and check the 255 kN Pu against the equivalent-load floor; the catalogue lists 1,700 r/min thermal reference speed and 2,200 r/min mechanical limiting speed. Mounting: used opposite the NUH locating bearing on wind-gearbox and heavy industrial pinion shafts; fit the inner ring with interference and let this bearing float axially. A 190 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates. The /PEX mark identifies the pinion-shaft build: it is the execution developed for the pinion position in wind-turbine and heavy industrial gearboxes, and SKF publishes its own rating line (C 2240 kN / C0 2750 kN here) because the roller complement and internal profiling differ from the standard execution. Treat NCF2338-ECJB-PEX as a separate service part: do not substitute the standard NCF 2338 bearing against the /PEX loads, and refit pinion arrangements with the same /PEX order number to preserve the calculated L10 and peak-torque margin.", "applications": [ "large mining mill pinion shafts", "multi-megawatt wind turbine main gearboxes", "offshore and marine heavy drive trains" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "micro-pitting on the profiled rollers under contaminated or starved-lubricant conditions despite the black-oxide treatment", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "cage fatigue in heavily reversing wind-turbine load cycles when relubrication intervals are exceeded", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "High-capacity NUH and NCF bearings are designed as a locating/non-locating PAIR on the same shaft; fitting two locating NUH bearings can preload the arrangement thermally.", "The /PEX pinion build and the standard NCF 2338 bearing are separate service parts with different internal profiling and rating lines; replacing the /PEX part with the standard execution silently erases the peak-torque margin the gearbox was designed for.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 400 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 2240/2750 kN ratings are SKF catalogue 17000 (2018) values for the ECJB/PEX execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2338-ECJB-PEX?", "a": "SKF NCF 2338 ECJB/PEX is a high-capacity cylindrical roller bearing with 190 mm bore, 400 mm OD and 132 mm width per ISO 15. SKF lists C 2240 kN, C0 2750 kN, Pu 255 kN, reference speed 1,700 r/min and limiting speed 2,200 r/min, mass about 78000 g." }, { "q": "What does the NCF designation and ECJB/PEX suffix mean?", "a": "The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Structurally this execution has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope." }, { "q": "Can NCF2338-ECJB-PEX take axial load and locate the shaft?", "a": "The high-capacity NCF ECJB execution is the non-locating partner in the NUH/NCF pair and should float axially." }, { "q": "How does NCF2338-ECJB-PEX compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NCF2338-ECJB", "equiv_brand": "SKF", "level": "partial", "note": "Same ISO 15 envelope 190×400×132 mm, but catalogue C/C0 ratings differ between executions (2240/2750 vs 1940/2750 kN) and the NCF flange/ring configuration differs — envelope match, not a load-rating equivalent." }, { "equiv_sku": "NUH2338-ECMH", "equiv_brand": "SKF", "level": "partial", "note": "Same ISO 15 envelope 190×400×132 mm, but catalogue C/C0 ratings differ between executions (2240/2750 vs 1940/2750 kN) and the NUH flange/ring configuration differs — envelope match, not a load-rating equivalent." }, { "equiv_sku": "NUH2338-ECMH-PEX", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 190×400×132 mm and equivalent catalogue ratings; the NUH execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.2 high-capacity cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2338-ECJB-PEX", "SKF NCF 2338 ECJB/PEX" ], "locale_variants": {} }, { "sku": "NCF2340-ECJB", "brand": "SKF", "manufacturer_designation": "SKF NCF 2340 ECJB", "series": "NCF2300-series", "type": "cylindrical_roller", "d_mm": 200, "D_mm": 420, "B_mm": 138, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2200, "static_load_kN": 3200, "fatigue_load_limit_kN": 300, "max_rpm": 2200, "reference_speed_rpm": 1400, "limiting_speed_rpm": 2200, "weight_g": 91500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 200 mm shaft, SKF lists NCF2340-ECJB as high-capacity cylindrical roller: 420 mm OD, 138 mm wide, Pu 300 kN, the catalogue lists 1,400 r/min thermal reference speed and 2,200 r/min mechanical limiting speed. Structurally, the NCF design has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope. In arrangement terms it is the non-locating member of the paired high-capacity arrangement, absorbing axial displacement while carrying the full high radial rating. The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. The pressed sheet-steel window-type cage is reflected in the published speeds and temperature limits. Load-per-bore for the 200 mm seat is about 11.00 kN/mm, typical of dimension series 23 (medium-section, wide); use C0 3200 kN for static checks such as crane hook blocks standing under load. Assembly note: used opposite the NUH locating bearing on wind-gearbox and heavy industrial pinion shafts; fit the inner ring with interference and let this bearing float axially. Heat steel rings inductively to max 120 °C. This is the standard catalogue execution of the high-capacity design. Selected sizes in the range are also produced as /PEX pinion-shaft builds for wind-turbine gearboxes — separate order numbers with their own rating lines and internal profiling; the two must not be mixed using one another’s loads.", "applications": [ "multi-megawatt wind turbine main gearboxes", "offshore and marine heavy drive trains", "large mining mill pinion shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "micro-pitting on the profiled rollers under contaminated or starved-lubricant conditions despite the black-oxide treatment", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "cage fatigue in heavily reversing wind-turbine load cycles when relubrication intervals are exceeded", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "High-capacity NUH and NCF bearings are designed as a locating/non-locating PAIR on the same shaft; fitting two locating NUH bearings can preload the arrangement thermally.", "The /PEX pinion execution carries its own rating line and internal geometry — never substitute a standard NCF 2340 using the /PEX loads.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 420 mm raceway.", "The 2200/3200 kN ratings are SKF catalogue 17000 (2018) values for the ECJB execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2340-ECJB?", "a": "SKF NCF 2340 ECJB is a high-capacity cylindrical roller bearing with 200 mm bore, 420 mm OD and 138 mm width per ISO 15. SKF lists C 2200 kN, C0 3200 kN, Pu 300 kN, reference speed 1,400 r/min and limiting speed 2,200 r/min, mass about 91500 g." }, { "q": "What does the NCF designation and ECJB suffix mean?", "a": "The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Structurally this execution has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope." }, { "q": "Can NCF2340-ECJB take axial load and locate the shaft?", "a": "The high-capacity NCF ECJB execution is the non-locating partner in the NUH/NCF pair and should float axially." }, { "q": "How does NCF2340-ECJB compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NCF2340-ECJB-PEX", "equiv_brand": "SKF", "level": "partial", "note": "Same ISO 15 envelope 200×420×138 mm, but catalogue C/C0 ratings differ between executions (2200/3200 vs 2550/3200 kN) and the NCF flange/ring configuration differs — envelope match, not a load-rating equivalent." }, { "equiv_sku": "NUH2340-ECMH", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 200×420×138 mm and equivalent catalogue ratings; the NUH execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUH2340-ECMH-PEX", "equiv_brand": "SKF", "level": "partial", "note": "Same ISO 15 envelope 200×420×138 mm, but catalogue C/C0 ratings differ between executions (2200/3200 vs 2550/3200 kN) and the NUH flange/ring configuration differs — envelope match, not a load-rating equivalent." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.2 high-capacity cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2340-ECJB", "SKF NCF 2340 ECJB" ], "locale_variants": {} }, { "sku": "NCF2340-ECJB-PEX", "brand": "SKF", "manufacturer_designation": "SKF NCF 2340 ECJB/PEX", "series": "NCF2300-series", "type": "cylindrical_roller", "d_mm": 200, "D_mm": 420, "B_mm": 138, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2550, "static_load_kN": 3200, "fatigue_load_limit_kN": 300, "max_rpm": 2200, "reference_speed_rpm": 1600, "limiting_speed_rpm": 2200, "weight_g": 91500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NCF 2340 ECJB/PEX resolves to a 200×420×138 mm high-capacity cylindrical roller bearing (dimension series 23 (medium-section, wide)); the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope. The NCF configuration means the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope; functionally the bearing is the non-locating member of the paired high-capacity arrangement, absorbing axial displacement while carrying the full high radial rating. Reading the order-string suffix ECJB/PEX: the high-capacity execution with pressed-steel cages (the /PEX mark denotes the pinion-shaft special build with its own catalogue rating line). Speed planning for NCF2340-ECJB-PEX: the catalogue lists 1,600 r/min thermal reference speed and 2,200 r/min mechanical limiting speed. The mass entry 91500 g covers the complete catalogue execution. Assembly note: used opposite the NUH locating bearing on wind-gearbox and heavy industrial pinion shafts; fit the inner ring with interference and let this bearing float axially. Heat steel rings inductively to max 120 °C. The /PEX mark identifies the pinion-shaft build: it is the execution developed for the pinion position in wind-turbine and heavy industrial gearboxes, and SKF publishes its own rating line (C 2550 kN / C0 3200 kN here) because the roller complement and internal profiling differ from the standard execution. Treat NCF2340-ECJB-PEX as a separate service part: do not substitute the standard NCF 2340 bearing against the /PEX loads, and refit pinion arrangements with the same /PEX order number to preserve the calculated L10 and peak-torque margin.", "applications": [ "multi-megawatt wind turbine main gearboxes", "offshore and marine heavy drive trains", "large mining mill pinion shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "micro-pitting on the profiled rollers under contaminated or starved-lubricant conditions despite the black-oxide treatment", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "cage fatigue in heavily reversing wind-turbine load cycles when relubrication intervals are exceeded", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "High-capacity NUH and NCF bearings are designed as a locating/non-locating PAIR on the same shaft; fitting two locating NUH bearings can preload the arrangement thermally.", "The /PEX pinion build and the standard NCF 2340 bearing are separate service parts with different internal profiling and rating lines; replacing the /PEX part with the standard execution silently erases the peak-torque margin the gearbox was designed for.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 420 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 138 mm-wide ring and concentrates load.", "The 2550/3200 kN ratings are SKF catalogue 17000 (2018) values for the ECJB/PEX execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2340-ECJB-PEX?", "a": "SKF NCF 2340 ECJB/PEX is a high-capacity cylindrical roller bearing with 200 mm bore, 420 mm OD and 138 mm width per ISO 15. SKF lists C 2550 kN, C0 3200 kN, Pu 300 kN, reference speed 1,600 r/min and limiting speed 2,200 r/min, mass about 91500 g." }, { "q": "What does the NCF designation and ECJB/PEX suffix mean?", "a": "The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Structurally this execution has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope." }, { "q": "Can NCF2340-ECJB-PEX take axial load and locate the shaft?", "a": "The high-capacity NCF ECJB execution is the non-locating partner in the NUH/NCF pair and should float axially." }, { "q": "How does NCF2340-ECJB-PEX compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NCF2340-ECJB", "equiv_brand": "SKF", "level": "partial", "note": "Same ISO 15 envelope 200×420×138 mm, but catalogue C/C0 ratings differ between executions (2550/3200 vs 2200/3200 kN) and the NCF flange/ring configuration differs — envelope match, not a load-rating equivalent." }, { "equiv_sku": "NUH2340-ECMH", "equiv_brand": "SKF", "level": "partial", "note": "Same ISO 15 envelope 200×420×138 mm, but catalogue C/C0 ratings differ between executions (2550/3200 vs 2200/3200 kN) and the NUH flange/ring configuration differs — envelope match, not a load-rating equivalent." }, { "equiv_sku": "NUH2340-ECMH-PEX", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 200×420×138 mm and equivalent catalogue ratings; the NUH execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.2 high-capacity cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2340-ECJB-PEX", "SKF NCF 2340 ECJB/PEX" ], "locale_variants": {} }, { "sku": "NCF2344-ECJB", "brand": "SKF", "manufacturer_designation": "SKF NCF 2344 ECJB", "series": "NCF2300-series", "type": "cylindrical_roller", "d_mm": 220, "D_mm": 460, "B_mm": 145, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 2510, "static_load_kN": 3650, "fatigue_load_limit_kN": 335, "max_rpm": 2000, "reference_speed_rpm": 1300, "limiting_speed_rpm": 2000, "weight_g": 116000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 220 mm shaft, SKF lists NCF2344-ECJB as high-capacity cylindrical roller: 460 mm OD, 145 mm wide, Pu 335 kN, the catalogue lists 1,300 r/min thermal reference speed and 2,000 r/min mechanical limiting speed. Reading the NCF prefix: the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope. This makes the execution the non-locating member of the paired high-capacity arrangement, absorbing axial displacement while carrying the full high radial rating. The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Speed planning for NCF2344-ECJB: the catalogue lists 1,300 r/min thermal reference speed and 2,000 r/min mechanical limiting speed. The mass entry 116000 g covers the complete catalogue execution. Mounting: used opposite the NUH locating bearing on wind-gearbox and heavy industrial pinion shafts; fit the inner ring with interference and let this bearing float axially. A 220 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates. This is the standard catalogue execution of the high-capacity design. Selected sizes in the range are also produced as /PEX pinion-shaft builds for wind-turbine gearboxes — separate order numbers with their own rating lines and internal profiling; the two must not be mixed using one another’s loads.", "applications": [ "large mining mill pinion shafts", "multi-megawatt wind turbine main gearboxes", "offshore and marine heavy drive trains" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "micro-pitting on the profiled rollers under contaminated or starved-lubricant conditions despite the black-oxide treatment", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "cage fatigue in heavily reversing wind-turbine load cycles when relubrication intervals are exceeded", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "High-capacity NUH and NCF bearings are designed as a locating/non-locating PAIR on the same shaft; fitting two locating NUH bearings can preload the arrangement thermally.", "The /PEX pinion execution carries its own rating line and internal geometry — never substitute a standard NCF 2344 using the /PEX loads.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 145 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 460 mm raceway.", "The 2510/3650 kN ratings are SKF catalogue 17000 (2018) values for the ECJB execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2344-ECJB?", "a": "SKF NCF 2344 ECJB is a high-capacity cylindrical roller bearing with 220 mm bore, 460 mm OD and 145 mm width per ISO 15. SKF lists C 2510 kN, C0 3650 kN, Pu 335 kN, reference speed 1,300 r/min and limiting speed 2,000 r/min, mass about 116000 g." }, { "q": "What does the NCF designation and ECJB suffix mean?", "a": "The ECJB suffix denotes the high-capacity execution with pressed-steel cages; /PEX marks the pinion-shaft special build with its own catalogue rating line. Structurally this execution has the high-capacity caged partner execution (ECJB pressed-steel cages with displaced cage bars for extra rollers), matching the NUH bearing in the same dimension envelope." }, { "q": "Can NCF2344-ECJB take axial load and locate the shaft?", "a": "The high-capacity NCF ECJB execution is the non-locating partner in the NUH/NCF pair and should float axially." }, { "q": "How does NCF2344-ECJB compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NUH2344-ECMH", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 220×460×145 mm and equivalent catalogue ratings; the NUH execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUH2344-ECMH-PEX", "equiv_brand": "SKF", "level": "partial", "note": "Same ISO 15 envelope 220×460×145 mm, but catalogue C/C0 ratings differ between executions (2510/3650 vs 2900/3650 kN) and the NUH flange/ring configuration differs — envelope match, not a load-rating equivalent." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.2 high-capacity cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2344-ECJB", "SKF NCF 2344 ECJB" ], "locale_variants": {} }, { "sku": "NCF28-500-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 28/500 V", "series": "NCF2800-series", "type": "cylindrical_roller", "d_mm": 500, "D_mm": 620, "B_mm": 72, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1340, "static_load_kN": 3350, "fatigue_load_limit_kN": 275, "max_rpm": 480, "reference_speed_rpm": 380, "limiting_speed_rpm": 480, "weight_g": 47000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NCF 28/500 V resolves to a 500×620×72 mm single-row full-complement cylindrical roller bearing (dimension series 28 (slim section, wide)); a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix V: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. With C 1340 kN and C0 3350 kN, size the bearing on the 500×620 mm ISO 15 envelope and check the 275 kN Pu against the equivalent-load floor; the catalogue lists 380 r/min thermal reference speed and 480 r/min mechanical limiting speed. Fit practice for NCF28-500-V: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "mining crusher eccentric shafts", "heavy offshore winch drums", "large rolling-mill and continuous-caster drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 480 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 620 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 620 mm raceway.", "The 1340/3350 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF28-500-V?", "a": "SKF NCF 28/500 V is a single-row full-complement cylindrical roller bearing with 500 mm bore, 620 mm OD and 72 mm width per ISO 15. SKF lists C 1340 kN, C0 3350 kN, Pu 275 kN, reference speed 380 r/min and limiting speed 480 r/min, mass about 47000 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF28-500-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF28-500-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF28", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF28-500-V", "SKF NCF 28/500 V" ], "locale_variants": {} }, { "sku": "NCF28-530-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 28/530 V", "series": "NCF2800-series", "type": "cylindrical_roller", "d_mm": 530, "D_mm": 650, "B_mm": 72, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1400, "static_load_kN": 3450, "fatigue_load_limit_kN": 285, "max_rpm": 450, "reference_speed_rpm": 360, "limiting_speed_rpm": 450, "weight_g": 49500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 530 mm shaft, SKF lists NCF28-530-V as single-row full-complement cylindrical roller: 650 mm OD, 72 mm wide, Pu 285 kN, the catalogue lists 360 r/min thermal reference speed and 450 r/min mechanical limiting speed. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Speed planning for NCF28-530-V: the catalogue lists 360 r/min thermal reference speed and 450 r/min mechanical limiting speed. The mass entry 49500 g covers the complete catalogue execution. Fit practice for NCF28-530-V: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "mining crusher eccentric shafts", "heavy offshore winch drums", "large rolling-mill and continuous-caster drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 450 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 1400/3450 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF28-530-V?", "a": "SKF NCF 28/530 V is a single-row full-complement cylindrical roller bearing with 530 mm bore, 650 mm OD and 72 mm width per ISO 15. SKF lists C 1400 kN, C0 3450 kN, Pu 285 kN, reference speed 360 r/min and limiting speed 450 r/min, mass about 49500 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF28-530-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF28-530-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF28", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF28-530-V", "SKF NCF 28/530 V" ], "locale_variants": {} }, { "sku": "NCF28-560-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 28/560 V", "series": "NCF2800-series", "type": "cylindrical_roller", "d_mm": 560, "D_mm": 680, "B_mm": 72, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1420, "static_load_kN": 3650, "fatigue_load_limit_kN": 300, "max_rpm": 430, "reference_speed_rpm": 340, "limiting_speed_rpm": 430, "weight_g": 54000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NCF 28/560 V resolves to a 560×680×72 mm single-row full-complement cylindrical roller bearing (dimension series 28 (slim section, wide)); a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix V: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 2.57 (3650 against 1420 kN), and the Pu figure 300 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 340 r/min thermal reference speed and 430 r/min mechanical limiting speed. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "heavy offshore winch drums", "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 430 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 72 mm-wide ring and concentrates load.", "The 1420/3650 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF28-560-V?", "a": "SKF NCF 28/560 V is a single-row full-complement cylindrical roller bearing with 560 mm bore, 680 mm OD and 72 mm width per ISO 15. SKF lists C 1420 kN, C0 3650 kN, Pu 300 kN, reference speed 340 r/min and limiting speed 430 r/min, mass about 54000 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF28-560-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF28-560-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF28", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF28-560-V", "SKF NCF 28/560 V" ], "locale_variants": {} }, { "sku": "NCF28-600-V-HB1", "brand": "SKF", "manufacturer_designation": "SKF NCF 28/600 V/HB1", "series": "NCF2800-series", "type": "cylindrical_roller", "d_mm": 600, "D_mm": 730, "B_mm": 78, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1570, "static_load_kN": 4300, "fatigue_load_limit_kN": 340, "max_rpm": 400, "reference_speed_rpm": 320, "limiting_speed_rpm": 400, "weight_g": 67500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 600 mm shaft, SKF lists NCF28-600-V-HB1 as single-row full-complement cylindrical roller: 730 mm OD, 78 mm wide, Pu 340 kN, the catalogue lists 320 r/min thermal reference speed and 400 r/min mechanical limiting speed. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V/HB1 identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. With C 1570 kN and C0 4300 kN, size the bearing on the 600×730 mm ISO 15 envelope and check the 340 kN Pu against the equivalent-load floor; the catalogue lists 320 r/min thermal reference speed and 400 r/min mechanical limiting speed. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "mining crusher eccentric shafts", "heavy offshore winch drums", "large rolling-mill and continuous-caster drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 400 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 1570/4300 kN ratings are SKF catalogue 17000 (2018) values for the V/HB1 execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF28-600-V-HB1?", "a": "SKF NCF 28/600 V/HB1 is a single-row full-complement cylindrical roller bearing with 600 mm bore, 730 mm OD and 78 mm width per ISO 15. SKF lists C 1570 kN, C0 4300 kN, Pu 340 kN, reference speed 320 r/min and limiting speed 400 r/min, mass about 67500 g." }, { "q": "What does the NCF designation and V/HB1 suffix mean?", "a": "Suffix V/HB1 identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF28-600-V-HB1 take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF28-600-V-HB1 compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF28", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF28-600-V-HB1", "SKF NCF 28/600 V/HB1" ], "locale_variants": {} }, { "sku": "NCF28-630-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 28/630 V", "series": "NCF2800-series", "type": "cylindrical_roller", "d_mm": 630, "D_mm": 780, "B_mm": 88, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1940, "static_load_kN": 5000, "fatigue_load_limit_kN": 390, "max_rpm": 360, "reference_speed_rpm": 300, "limiting_speed_rpm": 360, "weight_g": 92000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NCF 28/630 V is a single-row full-complement cylindrical roller bearing sized 630×780×88 mm — a dimension series 28 (slim section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix V: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 630 mm seat is about 3.08 kN/mm, typical of dimension series 28 (slim section, wide); use C0 5000 kN for static checks such as crane hook blocks standing under load. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 630 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "heavy offshore winch drums", "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 360 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 780 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 1940/5000 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF28-630-V?", "a": "SKF NCF 28/630 V is a single-row full-complement cylindrical roller bearing with 630 mm bore, 780 mm OD and 88 mm width per ISO 15. SKF lists C 1940 kN, C0 5000 kN, Pu 390 kN, reference speed 300 r/min and limiting speed 360 r/min, mass about 92000 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF28-630-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF28-630-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF28", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF28-630-V", "SKF NCF 28/630 V" ], "locale_variants": {} }, { "sku": "NCF28-670-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 28/670 V", "series": "NCF2800-series", "type": "cylindrical_roller", "d_mm": 670, "D_mm": 820, "B_mm": 88, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1940, "static_load_kN": 5300, "fatigue_load_limit_kN": 415, "max_rpm": 340, "reference_speed_rpm": 280, "limiting_speed_rpm": 340, "weight_g": 98000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 670 mm shaft, SKF lists NCF28-670-V as single-row full-complement cylindrical roller: 820 mm OD, 88 mm wide, Pu 415 kN, the catalogue lists 280 r/min thermal reference speed and 340 r/min mechanical limiting speed. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Load-per-bore for the 670 mm seat is about 2.90 kN/mm, typical of dimension series 28 (slim section, wide); use C0 5300 kN for static checks such as crane hook blocks standing under load. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 670 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts", "heavy offshore winch drums" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 340 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 820 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 88 mm-wide ring and concentrates load.", "The 1940/5300 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF28-670-V?", "a": "SKF NCF 28/670 V is a single-row full-complement cylindrical roller bearing with 670 mm bore, 820 mm OD and 88 mm width per ISO 15. SKF lists C 1940 kN, C0 5300 kN, Pu 415 kN, reference speed 280 r/min and limiting speed 340 r/min, mass about 98000 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF28-670-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF28-670-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF28", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF28-670-V", "SKF NCF 28/670 V" ], "locale_variants": {} }, { "sku": "NCF28-710-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 28/710 V", "series": "NCF2800-series", "type": "cylindrical_roller", "d_mm": 710, "D_mm": 870, "B_mm": 95, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 2330, "static_load_kN": 6300, "fatigue_load_limit_kN": 480, "max_rpm": 320, "reference_speed_rpm": 260, "limiting_speed_rpm": 320, "weight_g": 115000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 710 mm shaft, SKF lists NCF28-710-V as single-row full-complement cylindrical roller: 870 mm OD, 95 mm wide, Pu 480 kN, the catalogue lists 260 r/min thermal reference speed and 320 r/min mechanical limiting speed. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix V: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. The radial section height is 80.0 mm and the catalogue mass 115000 g; at 2330 kN dynamic rating this is roughly 3.28 kN of C per millimetre of bore before application factors. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "heavy offshore winch drums", "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 320 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 95 mm-wide ring and concentrates load.", "The 2330/6300 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF28-710-V?", "a": "SKF NCF 28/710 V is a single-row full-complement cylindrical roller bearing with 710 mm bore, 870 mm OD and 95 mm width per ISO 15. SKF lists C 2330 kN, C0 6300 kN, Pu 480 kN, reference speed 260 r/min and limiting speed 320 r/min, mass about 115000 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF28-710-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF28-710-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF28", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF28-710-V", "SKF NCF 28/710 V" ], "locale_variants": {} }, { "sku": "NCF28-750-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 28/750 V", "series": "NCF2800-series", "type": "cylindrical_roller", "d_mm": 750, "D_mm": 920, "B_mm": 100, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 2640, "static_load_kN": 6950, "fatigue_load_limit_kN": 520, "max_rpm": 300, "reference_speed_rpm": 240, "limiting_speed_rpm": 300, "weight_g": 139000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NCF28-750-V is the 750 mm bore entry in the NCF2800 range: a 750×920×100 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 2640 kN / C0 6950 kN. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. The radial section height is 85.0 mm and the catalogue mass 139000 g; at 2640 kN dynamic rating this is roughly 3.52 kN of C per millimetre of bore before application factors. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts", "heavy offshore winch drums" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 300 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 920 mm raceway.", "The 2640/6950 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF28-750-V?", "a": "SKF NCF 28/750 V is a single-row full-complement cylindrical roller bearing with 750 mm bore, 920 mm OD and 100 mm width per ISO 15. SKF lists C 2640 kN, C0 6950 kN, Pu 520 kN, reference speed 240 r/min and limiting speed 300 r/min, mass about 139000 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF28-750-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF28-750-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF28", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF28-750-V", "SKF NCF 28/750 V" ], "locale_variants": {} }, { "sku": "NCF28-800-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 28/800 V", "series": "NCF2800-series", "type": "cylindrical_roller", "d_mm": 800, "D_mm": 980, "B_mm": 106, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 2750, "static_load_kN": 7500, "fatigue_load_limit_kN": 550, "max_rpm": 280, "reference_speed_rpm": 220, "limiting_speed_rpm": 280, "weight_g": 169000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NCF28-800-V is the 800 mm bore entry in the NCF2800 range: a 800×980×106 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 2750 kN / C0 7500 kN. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 2.73 (7500 against 2750 kN), and the Pu figure 550 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 220 r/min thermal reference speed and 280 r/min mechanical limiting speed. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "mining crusher eccentric shafts", "heavy offshore winch drums", "large rolling-mill and continuous-caster drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 280 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 980 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 980 mm raceway.", "The 2750/7500 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF28-800-V?", "a": "SKF NCF 28/800 V is a single-row full-complement cylindrical roller bearing with 800 mm bore, 980 mm OD and 106 mm width per ISO 15. SKF lists C 2750 kN, C0 7500 kN, Pu 550 kN, reference speed 220 r/min and limiting speed 280 r/min, mass about 169000 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF28-800-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF28-800-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF28", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF28-800-V", "SKF NCF 28/800 V" ], "locale_variants": {} }, { "sku": "NCF28-850-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 28/850 V", "series": "NCF2800-series", "type": "cylindrical_roller", "d_mm": 850, "D_mm": 1030, "B_mm": 106, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 2860, "static_load_kN": 8000, "fatigue_load_limit_kN": 570, "max_rpm": 260, "reference_speed_rpm": 200, "limiting_speed_rpm": 260, "weight_g": 175000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NCF28-850-V is the 850 mm bore entry in the NCF2800 range: a 850×1030×106 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 2860 kN / C0 8000 kN. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. With C 2860 kN and C0 8000 kN, size the bearing on the 850×1030 mm ISO 15 envelope and check the 570 kN Pu against the equivalent-load floor; the catalogue lists 200 r/min thermal reference speed and 260 r/min mechanical limiting speed. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 850 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "mining crusher eccentric shafts", "heavy offshore winch drums", "large rolling-mill and continuous-caster drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 260 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 1030 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 1030 mm raceway.", "The 2860/8000 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF28-850-V?", "a": "SKF NCF 28/850 V is a single-row full-complement cylindrical roller bearing with 850 mm bore, 1030 mm OD and 106 mm width per ISO 15. SKF lists C 2860 kN, C0 8000 kN, Pu 570 kN, reference speed 200 r/min and limiting speed 260 r/min, mass about 175000 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF28-850-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF28-850-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF28", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF28-850-V", "SKF NCF 28/850 V" ], "locale_variants": {} }, { "sku": "NCF28-900-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 28/900 V", "series": "NCF2800-series", "type": "cylindrical_roller", "d_mm": 900, "D_mm": 1090, "B_mm": 112, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 3190, "static_load_kN": 9150, "fatigue_load_limit_kN": 655, "max_rpm": 240, "reference_speed_rpm": 190, "limiting_speed_rpm": 240, "weight_g": 210000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 900 mm shaft, SKF lists NCF28-900-V as single-row full-complement cylindrical roller: 1090 mm OD, 112 mm wide, Pu 655 kN, the catalogue lists 190 r/min thermal reference speed and 240 r/min mechanical limiting speed. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix V: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. The radial section height is 95.0 mm and the catalogue mass 210000 g; at 3190 kN dynamic rating this is roughly 3.54 kN of C per millimetre of bore before application factors. Fit practice for NCF28-900-V: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "heavy offshore winch drums", "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 240 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 112 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 1090 mm raceway.", "The 3190/9150 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF28-900-V?", "a": "SKF NCF 28/900 V is a single-row full-complement cylindrical roller bearing with 900 mm bore, 1090 mm OD and 112 mm width per ISO 15. SKF lists C 3190 kN, C0 9150 kN, Pu 655 kN, reference speed 190 r/min and limiting speed 240 r/min, mass about 210000 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF28-900-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF28-900-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF28", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF28-900-V", "SKF NCF 28/900 V" ], "locale_variants": {} }, { "sku": "NCF28-950-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 28/950 V", "series": "NCF2800-series", "type": "cylindrical_roller", "d_mm": 950, "D_mm": 1150, "B_mm": 118, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 3410, "static_load_kN": 9800, "fatigue_load_limit_kN": 655, "max_rpm": 220, "reference_speed_rpm": 170, "limiting_speed_rpm": 220, "weight_g": 240000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 950 mm shaft, SKF lists NCF28-950-V as single-row full-complement cylindrical roller: 1150 mm OD, 118 mm wide, Pu 655 kN, the catalogue lists 170 r/min thermal reference speed and 220 r/min mechanical limiting speed. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Speed planning for NCF28-950-V: the catalogue lists 170 r/min thermal reference speed and 220 r/min mechanical limiting speed. The mass entry 240000 g covers the complete catalogue execution. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "heavy offshore winch drums", "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 220 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 118 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 1150 mm raceway.", "The 3410/9800 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF28-950-V?", "a": "SKF NCF 28/950 V is a single-row full-complement cylindrical roller bearing with 950 mm bore, 1150 mm OD and 118 mm width per ISO 15. SKF lists C 3410 kN, C0 9800 kN, Pu 655 kN, reference speed 170 r/min and limiting speed 220 r/min, mass about 240000 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF28-950-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF28-950-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF28", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF28-950-V", "SKF NCF 28/950 V" ], "locale_variants": {} }, { "sku": "NCF2888-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 2888 V", "series": "NCF2800-series", "type": "cylindrical_roller", "d_mm": 440, "D_mm": 540, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1060, "static_load_kN": 2700, "fatigue_load_limit_kN": 232, "max_rpm": 560, "reference_speed_rpm": 450, "limiting_speed_rpm": 560, "weight_g": 30000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NCF 2888 V resolves to a 440×540×60 mm single-row full-complement cylindrical roller bearing (dimension series 28 (slim section, wide)); a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Load-per-bore for the 440 mm seat is about 2.41 kN/mm, typical of dimension series 28 (slim section, wide); use C0 2700 kN for static checks such as crane hook blocks standing under load. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "mining crusher eccentric shafts", "heavy offshore winch drums", "large rolling-mill and continuous-caster drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 560 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 540 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 540 mm raceway.", "The 1060/2700 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2888-V?", "a": "SKF NCF 2888 V is a single-row full-complement cylindrical roller bearing with 440 mm bore, 540 mm OD and 60 mm width per ISO 15. SKF lists C 1060 kN, C0 2700 kN, Pu 232 kN, reference speed 450 r/min and limiting speed 560 r/min, mass about 30000 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF2888-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF2888-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF2888", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2888-V", "SKF NCF 2888 V" ], "locale_variants": {} }, { "sku": "NCF2892-V-HB1", "brand": "SKF", "manufacturer_designation": "SKF NCF 2892 V/HB1", "series": "NCF2800-series", "type": "cylindrical_roller", "d_mm": 460, "D_mm": 580, "B_mm": 72, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1300, "static_load_kN": 3050, "fatigue_load_limit_kN": 260, "max_rpm": 530, "reference_speed_rpm": 430, "limiting_speed_rpm": 530, "weight_g": 44000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 460 mm shaft, SKF lists NCF2892-V-HB1 as single-row full-complement cylindrical roller: 580 mm OD, 72 mm wide, Pu 260 kN, the catalogue lists 430 r/min thermal reference speed and 530 r/min mechanical limiting speed. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V/HB1 identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 460 mm seat is about 2.83 kN/mm, typical of dimension series 28 (slim section, wide); use C0 3050 kN for static checks such as crane hook blocks standing under load. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts", "heavy offshore winch drums" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 530 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 72 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 1300/3050 kN ratings are SKF catalogue 17000 (2018) values for the V/HB1 execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2892-V-HB1?", "a": "SKF NCF 2892 V/HB1 is a single-row full-complement cylindrical roller bearing with 460 mm bore, 580 mm OD and 72 mm width per ISO 15. SKF lists C 1300 kN, C0 3050 kN, Pu 260 kN, reference speed 430 r/min and limiting speed 530 r/min, mass about 44000 g." }, { "q": "What does the NCF designation and V/HB1 suffix mean?", "a": "Suffix V/HB1 identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF2892-V-HB1 take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF2892-V-HB1 compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF2892", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2892-V-HB1", "SKF NCF 2892 V/HB1" ], "locale_variants": {} }, { "sku": "NCF2896-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 2896 V", "series": "NCF2800-series", "type": "cylindrical_roller", "d_mm": 480, "D_mm": 600, "B_mm": 72, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1320, "static_load_kN": 3150, "fatigue_load_limit_kN": 265, "max_rpm": 500, "reference_speed_rpm": 400, "limiting_speed_rpm": 500, "weight_g": 46000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NCF 2896 V resolves to a 480×600×72 mm single-row full-complement cylindrical roller bearing (dimension series 28 (slim section, wide)); a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 480 mm seat is about 2.75 kN/mm, typical of dimension series 28 (slim section, wide); use C0 3150 kN for static checks such as crane hook blocks standing under load. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 480 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts", "heavy offshore winch drums" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 500 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 600 mm raceway.", "The 1320/3150 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2896-V?", "a": "SKF NCF 2896 V is a single-row full-complement cylindrical roller bearing with 480 mm bore, 600 mm OD and 72 mm width per ISO 15. SKF lists C 1320 kN, C0 3150 kN, Pu 265 kN, reference speed 400 r/min and limiting speed 500 r/min, mass about 46000 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF2896-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF2896-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF2896", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2896-V", "SKF NCF 2896 V" ], "locale_variants": {} }, { "sku": "NCF29-500-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 29/500 V", "series": "NCF2900-series", "type": "cylindrical_roller", "d_mm": 500, "D_mm": 670, "B_mm": 100, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 2380, "static_load_kN": 5300, "fatigue_load_limit_kN": 430, "max_rpm": 450, "reference_speed_rpm": 360, "limiting_speed_rpm": 450, "weight_g": 100000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NCF 29/500 V is a single-row full-complement cylindrical roller bearing sized 500×670×100 mm — a dimension series 29 (compact OD, normal width), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Load-per-bore for the 500 mm seat is about 4.76 kN/mm, typical of dimension series 29 (compact OD, normal width); use C0 5300 kN for static checks such as crane hook blocks standing under load. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 500 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts", "heavy offshore winch drums" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 450 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 670 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 100 mm-wide ring and concentrates load.", "The 2380/5300 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF29-500-V?", "a": "SKF NCF 29/500 V is a single-row full-complement cylindrical roller bearing with 500 mm bore, 670 mm OD and 100 mm width per ISO 15. SKF lists C 2380 kN, C0 5300 kN, Pu 430 kN, reference speed 360 r/min and limiting speed 450 r/min, mass about 100000 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF29-500-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF29-500-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF29", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF29-500-V", "SKF NCF 29/500 V" ], "locale_variants": {} }, { "sku": "NCF29-530-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 29/530 V", "series": "NCF2900-series", "type": "cylindrical_roller", "d_mm": 530, "D_mm": 710, "B_mm": 106, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 2700, "static_load_kN": 6000, "fatigue_load_limit_kN": 465, "max_rpm": 430, "reference_speed_rpm": 340, "limiting_speed_rpm": 430, "weight_g": 120000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NCF29-530-V is the 530 mm bore entry in the NCF2900 range: a 530×710×106 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 2700 kN / C0 6000 kN. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix V: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 2.22 (6000 against 2700 kN), and the Pu figure 465 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 340 r/min thermal reference speed and 430 r/min mechanical limiting speed. Fit practice for NCF29-530-V: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts", "heavy offshore winch drums" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 430 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 710 mm raceway.", "The 2700/6000 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF29-530-V?", "a": "SKF NCF 29/530 V is a single-row full-complement cylindrical roller bearing with 530 mm bore, 710 mm OD and 106 mm width per ISO 15. SKF lists C 2700 kN, C0 6000 kN, Pu 465 kN, reference speed 340 r/min and limiting speed 430 r/min, mass about 120000 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF29-530-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF29-530-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF29", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF29-530-V", "SKF NCF 29/530 V" ], "locale_variants": {} }, { "sku": "NCF29-560-V-HB1", "brand": "SKF", "manufacturer_designation": "SKF NCF 29/560 V/HB1", "series": "NCF2900-series", "type": "cylindrical_roller", "d_mm": 560, "D_mm": 750, "B_mm": 112, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 3030, "static_load_kN": 6700, "fatigue_load_limit_kN": 490, "max_rpm": 400, "reference_speed_rpm": 320, "limiting_speed_rpm": 400, "weight_g": 140000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 29/560 V/HB1 denotes a single-row full-complement cylindrical roller bearing on the ISO 15 560×750×112 mm envelope, dimension series 29 (compact OD, normal width), with catalogue mass 140000 g. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix V/HB1: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. With C 3030 kN and C0 6700 kN, size the bearing on the 560×750 mm ISO 15 envelope and check the 490 kN Pu against the equivalent-load floor; the catalogue lists 320 r/min thermal reference speed and 400 r/min mechanical limiting speed. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "heavy offshore winch drums", "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 400 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 112 mm-wide ring and concentrates load.", "The 3030/6700 kN ratings are SKF catalogue 17000 (2018) values for the V/HB1 execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF29-560-V-HB1?", "a": "SKF NCF 29/560 V/HB1 is a single-row full-complement cylindrical roller bearing with 560 mm bore, 750 mm OD and 112 mm width per ISO 15. SKF lists C 3030 kN, C0 6700 kN, Pu 490 kN, reference speed 320 r/min and limiting speed 400 r/min, mass about 140000 g." }, { "q": "What does the NCF designation and V/HB1 suffix mean?", "a": "Suffix V/HB1 identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF29-560-V-HB1 take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF29-560-V-HB1 compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF29", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF29-560-V-HB1", "SKF NCF 29/560 V/HB1" ], "locale_variants": {} }, { "sku": "NCF29-600-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 29/600 V", "series": "NCF2900-series", "type": "cylindrical_roller", "d_mm": 600, "D_mm": 800, "B_mm": 118, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 3360, "static_load_kN": 7500, "fatigue_load_limit_kN": 550, "max_rpm": 380, "reference_speed_rpm": 300, "limiting_speed_rpm": 380, "weight_g": 170000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 29/600 V denotes a single-row full-complement cylindrical roller bearing on the ISO 15 600×800×118 mm envelope, dimension series 29 (compact OD, normal width), with catalogue mass 170000 g. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix V: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 2.23 (7500 against 3360 kN), and the Pu figure 550 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 300 r/min thermal reference speed and 380 r/min mechanical limiting speed. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "mining crusher eccentric shafts", "heavy offshore winch drums", "large rolling-mill and continuous-caster drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 380 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 118 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 118 mm-wide ring and concentrates load.", "The 3360/7500 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF29-600-V?", "a": "SKF NCF 29/600 V is a single-row full-complement cylindrical roller bearing with 600 mm bore, 800 mm OD and 118 mm width per ISO 15. SKF lists C 3360 kN, C0 7500 kN, Pu 550 kN, reference speed 300 r/min and limiting speed 380 r/min, mass about 170000 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF29-600-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF29-600-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF29", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF29-600-V", "SKF NCF 29/600 V" ], "locale_variants": {} }, { "sku": "NCF29-630-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 29/630 V", "series": "NCF2900-series", "type": "cylindrical_roller", "d_mm": 630, "D_mm": 850, "B_mm": 128, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 3740, "static_load_kN": 8650, "fatigue_load_limit_kN": 610, "max_rpm": 340, "reference_speed_rpm": 280, "limiting_speed_rpm": 340, "weight_g": 205000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 630 mm shaft, SKF lists NCF29-630-V as single-row full-complement cylindrical roller: 850 mm OD, 128 mm wide, Pu 610 kN, the catalogue lists 280 r/min thermal reference speed and 340 r/min mechanical limiting speed. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. With C 3740 kN and C0 8650 kN, size the bearing on the 630×850 mm ISO 15 envelope and check the 610 kN Pu against the equivalent-load floor; the catalogue lists 280 r/min thermal reference speed and 340 r/min mechanical limiting speed. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 630 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "heavy offshore winch drums", "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 340 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 128 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 850 mm raceway.", "The 3740/8650 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF29-630-V?", "a": "SKF NCF 29/630 V is a single-row full-complement cylindrical roller bearing with 630 mm bore, 850 mm OD and 128 mm width per ISO 15. SKF lists C 3740 kN, C0 8650 kN, Pu 610 kN, reference speed 280 r/min and limiting speed 340 r/min, mass about 205000 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF29-630-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF29-630-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF29", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF29-630-V", "SKF NCF 29/630 V" ], "locale_variants": {} }, { "sku": "NCF29-670-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 29/670 V", "series": "NCF2900-series", "type": "cylindrical_roller", "d_mm": 670, "D_mm": 900, "B_mm": 136, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 3910, "static_load_kN": 9000, "fatigue_load_limit_kN": 630, "max_rpm": 320, "reference_speed_rpm": 260, "limiting_speed_rpm": 320, "weight_g": 245000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NCF29-670-V is the 670 mm bore entry in the NCF2900 range: a 670×900×136 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 3910 kN / C0 9000 kN. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 2.30 (9000 against 3910 kN), and the Pu figure 630 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 260 r/min thermal reference speed and 320 r/min mechanical limiting speed. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "mining crusher eccentric shafts", "heavy offshore winch drums", "large rolling-mill and continuous-caster drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 320 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 900 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 900 mm raceway.", "The 3910/9000 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF29-670-V?", "a": "SKF NCF 29/670 V is a single-row full-complement cylindrical roller bearing with 670 mm bore, 900 mm OD and 136 mm width per ISO 15. SKF lists C 3910 kN, C0 9000 kN, Pu 630 kN, reference speed 260 r/min and limiting speed 320 r/min, mass about 245000 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF29-670-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF29-670-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF29", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF29-670-V", "SKF NCF 29/670 V" ], "locale_variants": {} }, { "sku": "NCF29-710-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 29/710 V", "series": "NCF2900-series", "type": "cylindrical_roller", "d_mm": 710, "D_mm": 950, "B_mm": 140, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 4290, "static_load_kN": 10000, "fatigue_load_limit_kN": 695, "max_rpm": 300, "reference_speed_rpm": 240, "limiting_speed_rpm": 300, "weight_g": 275000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NCF 29/710 V resolves to a 710×950×140 mm single-row full-complement cylindrical roller bearing (dimension series 29 (compact OD, normal width)); a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Speed planning for NCF29-710-V: the catalogue lists 240 r/min thermal reference speed and 300 r/min mechanical limiting speed. The mass entry 275000 g covers the complete catalogue execution. Fit practice for NCF29-710-V: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "mining crusher eccentric shafts", "heavy offshore winch drums", "large rolling-mill and continuous-caster drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 300 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 4290/10000 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF29-710-V?", "a": "SKF NCF 29/710 V is a single-row full-complement cylindrical roller bearing with 710 mm bore, 950 mm OD and 140 mm width per ISO 15. SKF lists C 4290 kN, C0 10000 kN, Pu 695 kN, reference speed 240 r/min and limiting speed 300 r/min, mass about 275000 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF29-710-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF29-710-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF29", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF29-710-V", "SKF NCF 29/710 V" ], "locale_variants": {} }, { "sku": "NCF29-750-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 29/750 V", "series": "NCF2900-series", "type": "cylindrical_roller", "d_mm": 750, "D_mm": 1000, "B_mm": 145, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 4460, "static_load_kN": 10600, "fatigue_load_limit_kN": 710, "max_rpm": 280, "reference_speed_rpm": 220, "limiting_speed_rpm": 280, "weight_g": 313000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 29/750 V denotes a single-row full-complement cylindrical roller bearing on the ISO 15 750×1000×145 mm envelope, dimension series 29 (compact OD, normal width), with catalogue mass 313000 g. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Speed planning for NCF29-750-V: the catalogue lists 220 r/min thermal reference speed and 280 r/min mechanical limiting speed. The mass entry 313000 g covers the complete catalogue execution. Fit practice for NCF29-750-V: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "heavy offshore winch drums", "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 280 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 145 mm-wide ring and concentrates load.", "The 4460/10600 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF29-750-V?", "a": "SKF NCF 29/750 V is a single-row full-complement cylindrical roller bearing with 750 mm bore, 1000 mm OD and 145 mm width per ISO 15. SKF lists C 4460 kN, C0 10600 kN, Pu 710 kN, reference speed 220 r/min and limiting speed 280 r/min, mass about 313000 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF29-750-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF29-750-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF29", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF29-750-V", "SKF NCF 29/750 V" ], "locale_variants": {} }, { "sku": "NCF29-800-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 29/800 V", "series": "NCF2900-series", "type": "cylindrical_roller", "d_mm": 800, "D_mm": 1060, "B_mm": 150, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 4950, "static_load_kN": 12000, "fatigue_load_limit_kN": 800, "max_rpm": 260, "reference_speed_rpm": 200, "limiting_speed_rpm": 260, "weight_g": 359000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NCF 29/800 V resolves to a 800×1060×150 mm single-row full-complement cylindrical roller bearing (dimension series 29 (compact OD, normal width)); a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix V: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. With C 4950 kN and C0 12000 kN, size the bearing on the 800×1060 mm ISO 15 envelope and check the 800 kN Pu against the equivalent-load floor; the catalogue lists 200 r/min thermal reference speed and 260 r/min mechanical limiting speed. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts", "heavy offshore winch drums" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 260 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 1060 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 150 mm-wide ring and concentrates load.", "The 4950/12000 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF29-800-V?", "a": "SKF NCF 29/800 V is a single-row full-complement cylindrical roller bearing with 800 mm bore, 1060 mm OD and 150 mm width per ISO 15. SKF lists C 4950 kN, C0 12000 kN, Pu 800 kN, reference speed 200 r/min and limiting speed 260 r/min, mass about 359000 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF29-800-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF29-800-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF29", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF29-800-V", "SKF NCF 29/800 V" ], "locale_variants": {} }, { "sku": "NCF29-850-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 29/850 V", "series": "NCF2900-series", "type": "cylindrical_roller", "d_mm": 850, "D_mm": 1120, "B_mm": 155, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 5230, "static_load_kN": 12700, "fatigue_load_limit_kN": 830, "max_rpm": 240, "reference_speed_rpm": 190, "limiting_speed_rpm": 240, "weight_g": 406000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NCF 29/850 V resolves to a 850×1120×155 mm single-row full-complement cylindrical roller bearing (dimension series 29 (compact OD, normal width)); a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Load-per-bore for the 850 mm seat is about 6.15 kN/mm, typical of dimension series 29 (compact OD, normal width); use C0 12700 kN for static checks such as crane hook blocks standing under load. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 850 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts", "heavy offshore winch drums" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 240 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 1120 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 155 mm-wide ring and concentrates load.", "The 5230/12700 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF29-850-V?", "a": "SKF NCF 29/850 V is a single-row full-complement cylindrical roller bearing with 850 mm bore, 1120 mm OD and 155 mm width per ISO 15. SKF lists C 5230 kN, C0 12700 kN, Pu 830 kN, reference speed 190 r/min and limiting speed 240 r/min, mass about 406000 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF29-850-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF29-850-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF29", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF29-850-V", "SKF NCF 29/850 V" ], "locale_variants": {} }, { "sku": "NCF29-900-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 29/900 V", "series": "NCF2900-series", "type": "cylindrical_roller", "d_mm": 900, "D_mm": 1180, "B_mm": 165, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 5940, "static_load_kN": 14600, "fatigue_load_limit_kN": 950, "max_rpm": 220, "reference_speed_rpm": 170, "limiting_speed_rpm": 220, "weight_g": 472000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NCF29-900-V is the 900 mm bore entry in the NCF2900 range: a 900×1180×165 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 5940 kN / C0 14600 kN. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Speed planning for NCF29-900-V: the catalogue lists 170 r/min thermal reference speed and 220 r/min mechanical limiting speed. The mass entry 472000 g covers the complete catalogue execution. Fit practice for NCF29-900-V: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "mining crusher eccentric shafts", "heavy offshore winch drums", "large rolling-mill and continuous-caster drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 220 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 165 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 165 mm-wide ring and concentrates load.", "The 5940/14600 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF29-900-V?", "a": "SKF NCF 29/900 V is a single-row full-complement cylindrical roller bearing with 900 mm bore, 1180 mm OD and 165 mm width per ISO 15. SKF lists C 5940 kN, C0 14600 kN, Pu 950 kN, reference speed 170 r/min and limiting speed 220 r/min, mass about 472000 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF29-900-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF29-900-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF29", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF29-900-V", "SKF NCF 29/900 V" ], "locale_variants": {} }, { "sku": "NCF29-950-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 29/950 V", "series": "NCF2900-series", "type": "cylindrical_roller", "d_mm": 950, "D_mm": 1250, "B_mm": 175, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 6600, "static_load_kN": 16300, "fatigue_load_limit_kN": 1020, "max_rpm": 200, "reference_speed_rpm": 160, "limiting_speed_rpm": 200, "weight_g": 565000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NCF29-950-V is the 950 mm bore entry in the NCF2900 range: a 950×1250×175 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 6600 kN / C0 16300 kN. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix V: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 2.47 (16300 against 6600 kN), and the Pu figure 1020 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 160 r/min thermal reference speed and 200 r/min mechanical limiting speed. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "mining crusher eccentric shafts", "heavy offshore winch drums", "large rolling-mill and continuous-caster drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 200 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 175 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 175 mm-wide ring and concentrates load.", "The 6600/16300 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF29-950-V?", "a": "SKF NCF 29/950 V is a single-row full-complement cylindrical roller bearing with 950 mm bore, 1250 mm OD and 175 mm width per ISO 15. SKF lists C 6600 kN, C0 16300 kN, Pu 1020 kN, reference speed 160 r/min and limiting speed 200 r/min, mass about 565000 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF29-950-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF29-950-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF29", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF29-950-V", "SKF NCF 29/950 V" ], "locale_variants": {} }, { "sku": "NCF2912-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 2912 CV", "series": "NCF2900-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 85, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 55, "static_load_kN": 80, "fatigue_load_limit_kN": 9.15, "max_rpm": 4500, "reference_speed_rpm": 3600, "limiting_speed_rpm": 4500, "weight_g": 270, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NCF2912-CV is the 60 mm bore entry in the NCF2900 range: a 60×85×16 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 55 kN / C0 80 kN. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 1.45 (80 against 55 kN), and the Pu figure 9.15 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 3,600 r/min thermal reference speed and 4,500 r/min mechanical limiting speed. Fit practice for NCF2912-CV: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "wind turbine rotor-lock and yaw drives", "large gearbox slow-speed stages", "rolling-mill auxiliary shafts", "heavy conveyor pulley bearings" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 4,500 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 85 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 55/80 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2912-CV?", "a": "SKF NCF 2912 CV is a single-row full-complement cylindrical roller bearing with 60 mm bore, 85 mm OD and 16 mm width per ISO 15. SKF lists C 55 kN, C0 80 kN, Pu 9.15 kN, reference speed 3,600 r/min and limiting speed 4,500 r/min, mass about 270 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF2912-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF2912-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF2912", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2912-CV", "SKF NCF 2912 CV" ], "locale_variants": {} }, { "sku": "NCF2913-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 2913 CV", "series": "NCF2900-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 90, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 58.3, "static_load_kN": 88, "fatigue_load_limit_kN": 10.2, "max_rpm": 4000, "reference_speed_rpm": 3200, "limiting_speed_rpm": 4000, "weight_g": 310, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 65 mm shaft, SKF lists NCF2913-CV as single-row full-complement cylindrical roller: 90 mm OD, 16 mm wide, Pu 10.2 kN, the catalogue lists 3,200 r/min thermal reference speed and 4,000 r/min mechanical limiting speed. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Speed planning for NCF2913-CV: the catalogue lists 3,200 r/min thermal reference speed and 4,000 r/min mechanical limiting speed. The mass entry 310 g covers the complete catalogue execution. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 65 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "rolling-mill auxiliary shafts", "heavy conveyor pulley bearings", "wind turbine rotor-lock and yaw drives", "large gearbox slow-speed stages" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 4,000 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 90 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 58.3/88 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2913-CV?", "a": "SKF NCF 2913 CV is a single-row full-complement cylindrical roller bearing with 65 mm bore, 90 mm OD and 16 mm width per ISO 15. SKF lists C 58.3 kN, C0 88 kN, Pu 10.2 kN, reference speed 3,200 r/min and limiting speed 4,000 r/min, mass about 310 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF2913-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF2913-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF2913", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2913-CV", "SKF NCF 2913 CV" ], "locale_variants": {} }, { "sku": "NCF2914-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 2914 CV", "series": "NCF2900-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 100, "B_mm": 19, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 76.5, "static_load_kN": 116, "fatigue_load_limit_kN": 13.7, "max_rpm": 3800, "reference_speed_rpm": 3000, "limiting_speed_rpm": 3800, "weight_g": 490, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NCF 2914 CV is a single-row full-complement cylindrical roller bearing sized 70×100×19 mm — a dimension series 29 (compact OD, normal width), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 1.52 (116 against 76.5 kN), and the Pu figure 13.7 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 3,000 r/min thermal reference speed and 3,800 r/min mechanical limiting speed. Fit practice for NCF2914-CV: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "heavy conveyor pulley bearings", "wind turbine rotor-lock and yaw drives", "large gearbox slow-speed stages", "rolling-mill auxiliary shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 3,800 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 100 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 100 mm raceway.", "The 76.5/116 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2914-CV?", "a": "SKF NCF 2914 CV is a single-row full-complement cylindrical roller bearing with 70 mm bore, 100 mm OD and 19 mm width per ISO 15. SKF lists C 76.5 kN, C0 116 kN, Pu 13.7 kN, reference speed 3,000 r/min and limiting speed 3,800 r/min, mass about 490 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF2914-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF2914-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF2914", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2914-CV", "SKF NCF 2914 CV" ], "locale_variants": {} }, { "sku": "NCF2915-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 2915 CV", "series": "NCF2900-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 105, "B_mm": 19, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 79.2, "static_load_kN": 125, "fatigue_load_limit_kN": 14.6, "max_rpm": 3600, "reference_speed_rpm": 2800, "limiting_speed_rpm": 3600, "weight_g": 520, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 2915 CV denotes a single-row full-complement cylindrical roller bearing on the ISO 15 75×105×19 mm envelope, dimension series 29 (compact OD, normal width), with catalogue mass 520 g. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. With C 79.2 kN and C0 125 kN, size the bearing on the 75×105 mm ISO 15 envelope and check the 14.6 kN Pu against the equivalent-load floor; the catalogue lists 2,800 r/min thermal reference speed and 3,600 r/min mechanical limiting speed. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "wind turbine rotor-lock and yaw drives", "large gearbox slow-speed stages", "rolling-mill auxiliary shafts", "heavy conveyor pulley bearings" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 3,600 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 105 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 19 mm-wide ring and concentrates load.", "The 79.2/125 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2915-CV?", "a": "SKF NCF 2915 CV is a single-row full-complement cylindrical roller bearing with 75 mm bore, 105 mm OD and 19 mm width per ISO 15. SKF lists C 79.2 kN, C0 125 kN, Pu 14.6 kN, reference speed 2,800 r/min and limiting speed 3,600 r/min, mass about 520 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF2915-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF2915-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF2915", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2915-CV", "SKF NCF 2915 CV" ], "locale_variants": {} }, { "sku": "NCF2916-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 2916 CV", "series": "NCF2900-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 110, "B_mm": 19, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 80.9, "static_load_kN": 132, "fatigue_load_limit_kN": 15.6, "max_rpm": 3400, "reference_speed_rpm": 2600, "limiting_speed_rpm": 3400, "weight_g": 550, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NCF 2916 CV resolves to a 80×110×19 mm single-row full-complement cylindrical roller bearing (dimension series 29 (compact OD, normal width)); a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 1.63 (132 against 80.9 kN), and the Pu figure 15.6 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 2,600 r/min thermal reference speed and 3,400 r/min mechanical limiting speed. Fit practice for NCF2916-CV: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "rolling-mill auxiliary shafts", "heavy conveyor pulley bearings", "wind turbine rotor-lock and yaw drives", "large gearbox slow-speed stages" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 3,400 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 110 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 19 mm-wide ring and concentrates load.", "The 80.9/132 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2916-CV?", "a": "SKF NCF 2916 CV is a single-row full-complement cylindrical roller bearing with 80 mm bore, 110 mm OD and 19 mm width per ISO 15. SKF lists C 80.9 kN, C0 132 kN, Pu 15.6 kN, reference speed 2,600 r/min and limiting speed 3,400 r/min, mass about 550 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF2916-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF2916-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF2916", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2916-CV", "SKF NCF 2916 CV" ], "locale_variants": {} }, { "sku": "NCF2917-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 2917 CV", "series": "NCF2900-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 120, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 102, "static_load_kN": 166, "fatigue_load_limit_kN": 20.4, "max_rpm": 6300, "reference_speed_rpm": 6300, "limiting_speed_rpm": 6300, "weight_g": 810, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NCF2917-CV is the 85 mm bore entry in the NCF2900 range: a 85×120×22 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 102 kN / C0 166 kN. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. With C 102 kN and C0 166 kN, size the bearing on the 85×120 mm ISO 15 envelope and check the 20.4 kN Pu against the equivalent-load floor; the catalogue lists 6,300 r/min thermal reference speed and 6,300 r/min mechanical limiting speed. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "heavy conveyor pulley bearings", "wind turbine rotor-lock and yaw drives", "large gearbox slow-speed stages", "rolling-mill auxiliary shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 6,300 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 120 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 102/166 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2917-CV?", "a": "SKF NCF 2917 CV is a single-row full-complement cylindrical roller bearing with 85 mm bore, 120 mm OD and 22 mm width per ISO 15. SKF lists C 102 kN, C0 166 kN, Pu 20.4 kN, reference speed 6,300 r/min and limiting speed 6,300 r/min, mass about 810 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF2917-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF2917-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF2917", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2917-CV", "SKF NCF 2917 CV" ], "locale_variants": {} }, { "sku": "NCF2918-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 2918 CV", "series": "NCF2900-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 125, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 105, "static_load_kN": 176, "fatigue_load_limit_kN": 20.8, "max_rpm": 3000, "reference_speed_rpm": 2400, "limiting_speed_rpm": 3000, "weight_g": 840, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 90 mm shaft, SKF lists NCF2918-CV as single-row full-complement cylindrical roller: 125 mm OD, 22 mm wide, Pu 20.8 kN, the catalogue lists 2,400 r/min thermal reference speed and 3,000 r/min mechanical limiting speed. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 1.68 (176 against 105 kN), and the Pu figure 20.8 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 2,400 r/min thermal reference speed and 3,000 r/min mechanical limiting speed. Fit practice for NCF2918-CV: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "large gearbox slow-speed stages", "rolling-mill auxiliary shafts", "heavy conveyor pulley bearings", "wind turbine rotor-lock and yaw drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 3,000 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 125 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 105/176 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2918-CV?", "a": "SKF NCF 2918 CV is a single-row full-complement cylindrical roller bearing with 90 mm bore, 125 mm OD and 22 mm width per ISO 15. SKF lists C 105 kN, C0 176 kN, Pu 20.8 kN, reference speed 2,400 r/min and limiting speed 3,000 r/min, mass about 840 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF2918-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF2918-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF2918", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2918-CV", "SKF NCF 2918 CV" ], "locale_variants": {} }, { "sku": "NCF2920-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 2920 CV", "series": "NCF2900-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 140, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 128, "static_load_kN": 200, "fatigue_load_limit_kN": 24.5, "max_rpm": 2600, "reference_speed_rpm": 2000, "limiting_speed_rpm": 2600, "weight_g": 1100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NCF 2920 CV resolves to a 100×140×24 mm single-row full-complement cylindrical roller bearing (dimension series 29 (compact OD, normal width)); a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Speed planning for NCF2920-CV: the catalogue lists 2,000 r/min thermal reference speed and 2,600 r/min mechanical limiting speed. The mass entry 1100 g covers the complete catalogue execution. Fit practice for NCF2920-CV: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "rolling-mill auxiliary shafts", "heavy conveyor pulley bearings", "wind turbine rotor-lock and yaw drives", "large gearbox slow-speed stages" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 2,600 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 140 mm raceway.", "The 128/200 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2920-CV?", "a": "SKF NCF 2920 CV is a single-row full-complement cylindrical roller bearing with 100 mm bore, 140 mm OD and 24 mm width per ISO 15. SKF lists C 128 kN, C0 200 kN, Pu 24.5 kN, reference speed 2,000 r/min and limiting speed 2,600 r/min, mass about 1100 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF2920-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF2920-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF2920", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2920-CV", "SKF NCF 2920 CV" ], "locale_variants": {} }, { "sku": "NCF2922-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 2922 CV", "series": "NCF2900-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 150, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 134, "static_load_kN": 220, "fatigue_load_limit_kN": 26, "max_rpm": 2400, "reference_speed_rpm": 1900, "limiting_speed_rpm": 2400, "weight_g": 1200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 110 mm shaft, SKF lists NCF2922-CV as single-row full-complement cylindrical roller: 150 mm OD, 24 mm wide, Pu 26 kN, the catalogue lists 1,900 r/min thermal reference speed and 2,400 r/min mechanical limiting speed. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. With C 134 kN and C0 220 kN, size the bearing on the 110×150 mm ISO 15 envelope and check the 26 kN Pu against the equivalent-load floor; the catalogue lists 1,900 r/min thermal reference speed and 2,400 r/min mechanical limiting speed. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 110 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "wind turbine rotor-lock and yaw drives", "large gearbox slow-speed stages", "rolling-mill auxiliary shafts", "heavy conveyor pulley bearings" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 2,400 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 134/220 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2922-CV?", "a": "SKF NCF 2922 CV is a single-row full-complement cylindrical roller bearing with 110 mm bore, 150 mm OD and 24 mm width per ISO 15. SKF lists C 134 kN, C0 220 kN, Pu 26 kN, reference speed 1,900 r/min and limiting speed 2,400 r/min, mass about 1200 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF2922-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF2922-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF2922", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2922-CV", "SKF NCF 2922 CV" ], "locale_variants": {} }, { "sku": "NCF2924-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 2924 CV", "series": "NCF2900-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 165, "B_mm": 27, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 172, "static_load_kN": 290, "fatigue_load_limit_kN": 34.5, "max_rpm": 4300, "reference_speed_rpm": 4300, "limiting_speed_rpm": 4300, "weight_g": 1750, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 2924 CV denotes a single-row full-complement cylindrical roller bearing on the ISO 15 120×165×27 mm envelope, dimension series 29 (compact OD, normal width), with catalogue mass 1750 g. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The radial section height is 22.5 mm and the catalogue mass 1750 g; at 172 kN dynamic rating this is roughly 1.43 kN of C per millimetre of bore before application factors. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 120 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "heavy offshore winch drums", "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 4,300 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 27 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 165 mm raceway.", "The 172/290 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2924-CV?", "a": "SKF NCF 2924 CV is a single-row full-complement cylindrical roller bearing with 120 mm bore, 165 mm OD and 27 mm width per ISO 15. SKF lists C 172 kN, C0 290 kN, Pu 34.5 kN, reference speed 4,300 r/min and limiting speed 4,300 r/min, mass about 1750 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF2924-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF2924-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF2924", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2924-CV", "SKF NCF 2924 CV" ], "locale_variants": {} }, { "sku": "NCF2926-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 2926 CV", "series": "NCF2900-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 180, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 205, "static_load_kN": 360, "fatigue_load_limit_kN": 40.5, "max_rpm": 2000, "reference_speed_rpm": 1600, "limiting_speed_rpm": 2000, "weight_g": 2350, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NCF2926-CV is the 130 mm bore entry in the NCF2900 range: a 130×180×30 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 205 kN / C0 360 kN. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. The radial section height is 25.0 mm and the catalogue mass 2350 g; at 205 kN dynamic rating this is roughly 1.58 kN of C per millimetre of bore before application factors. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 130 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "mining crusher eccentric shafts", "heavy offshore winch drums", "large rolling-mill and continuous-caster drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 2,000 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 30 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 30 mm-wide ring and concentrates load.", "The 205/360 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2926-CV?", "a": "SKF NCF 2926 CV is a single-row full-complement cylindrical roller bearing with 130 mm bore, 180 mm OD and 30 mm width per ISO 15. SKF lists C 205 kN, C0 360 kN, Pu 40.5 kN, reference speed 1,600 r/min and limiting speed 2,000 r/min, mass about 2350 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF2926-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF2926-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF2926", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2926-CV", "SKF NCF 2926 CV" ], "locale_variants": {} }, { "sku": "NCF2928-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 2928 CV", "series": "NCF2900-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 190, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 220, "static_load_kN": 390, "fatigue_load_limit_kN": 43, "max_rpm": 1900, "reference_speed_rpm": 1500, "limiting_speed_rpm": 1900, "weight_g": 2400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NCF 2928 CV is a single-row full-complement cylindrical roller bearing sized 140×190×30 mm — a dimension series 29 (compact OD, normal width), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 1.77 (390 against 220 kN), and the Pu figure 43 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 1,500 r/min thermal reference speed and 1,900 r/min mechanical limiting speed. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "heavy offshore winch drums", "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 1,900 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 30 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 190 mm raceway.", "The 220/390 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2928-CV?", "a": "SKF NCF 2928 CV is a single-row full-complement cylindrical roller bearing with 140 mm bore, 190 mm OD and 30 mm width per ISO 15. SKF lists C 220 kN, C0 390 kN, Pu 43 kN, reference speed 1,500 r/min and limiting speed 1,900 r/min, mass about 2400 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF2928-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF2928-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF2928", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2928-CV", "SKF NCF 2928 CV" ], "locale_variants": {} }, { "sku": "NCF2930-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 2930 CV", "series": "NCF2900-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 210, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 292, "static_load_kN": 490, "fatigue_load_limit_kN": 55, "max_rpm": 1700, "reference_speed_rpm": 1400, "limiting_speed_rpm": 1700, "weight_g": 3750, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NCF 2930 CV resolves to a 150×210×36 mm single-row full-complement cylindrical roller bearing (dimension series 29 (compact OD, normal width)); a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Speed planning for NCF2930-CV: the catalogue lists 1,400 r/min thermal reference speed and 1,700 r/min mechanical limiting speed. The mass entry 3750 g covers the complete catalogue execution. Fit practice for NCF2930-CV: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts", "heavy offshore winch drums" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 1,700 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 210 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 36 mm-wide ring and concentrates load.", "The 292/490 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2930-CV?", "a": "SKF NCF 2930 CV is a single-row full-complement cylindrical roller bearing with 150 mm bore, 210 mm OD and 36 mm width per ISO 15. SKF lists C 292 kN, C0 490 kN, Pu 55 kN, reference speed 1,400 r/min and limiting speed 1,700 r/min, mass about 3750 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF2930-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF2930-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF2930", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2930-CV", "SKF NCF 2930 CV" ], "locale_variants": {} }, { "sku": "NCF2932-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 2932 CV", "series": "NCF2900-series", "type": "cylindrical_roller", "d_mm": 160, "D_mm": 220, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 303, "static_load_kN": 530, "fatigue_load_limit_kN": 58.5, "max_rpm": 1600, "reference_speed_rpm": 1300, "limiting_speed_rpm": 1600, "weight_g": 4000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 160 mm shaft, SKF lists NCF2932-CV as single-row full-complement cylindrical roller: 220 mm OD, 36 mm wide, Pu 58.5 kN, the catalogue lists 1,300 r/min thermal reference speed and 1,600 r/min mechanical limiting speed. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Speed planning for NCF2932-CV: the catalogue lists 1,300 r/min thermal reference speed and 1,600 r/min mechanical limiting speed. The mass entry 4000 g covers the complete catalogue execution. Fit practice for NCF2932-CV: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "heavy offshore winch drums", "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 1,600 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 220 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 303/530 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2932-CV?", "a": "SKF NCF 2932 CV is a single-row full-complement cylindrical roller bearing with 160 mm bore, 220 mm OD and 36 mm width per ISO 15. SKF lists C 303 kN, C0 530 kN, Pu 58.5 kN, reference speed 1,300 r/min and limiting speed 1,600 r/min, mass about 4000 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF2932-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF2932-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF2932", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2932-CV", "SKF NCF 2932 CV" ], "locale_variants": {} }, { "sku": "NCF2934-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 2934 CV", "series": "NCF2900-series", "type": "cylindrical_roller", "d_mm": 170, "D_mm": 230, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 314, "static_load_kN": 560, "fatigue_load_limit_kN": 60, "max_rpm": 1500, "reference_speed_rpm": 1200, "limiting_speed_rpm": 1500, "weight_g": 4300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 2934 CV denotes a single-row full-complement cylindrical roller bearing on the ISO 15 170×230×36 mm envelope, dimension series 29 (compact OD, normal width), with catalogue mass 4300 g. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Speed planning for NCF2934-CV: the catalogue lists 1,200 r/min thermal reference speed and 1,500 r/min mechanical limiting speed. The mass entry 4300 g covers the complete catalogue execution. Fit practice for NCF2934-CV: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "mining crusher eccentric shafts", "heavy offshore winch drums", "large rolling-mill and continuous-caster drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 1,500 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 230 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 230 mm raceway.", "The 314/560 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2934-CV?", "a": "SKF NCF 2934 CV is a single-row full-complement cylindrical roller bearing with 170 mm bore, 230 mm OD and 36 mm width per ISO 15. SKF lists C 314 kN, C0 560 kN, Pu 60 kN, reference speed 1,200 r/min and limiting speed 1,500 r/min, mass about 4300 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF2934-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF2934-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF2934", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2934-CV", "SKF NCF 2934 CV" ], "locale_variants": {} }, { "sku": "NCF2936-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 2936 CV", "series": "NCF2900-series", "type": "cylindrical_roller", "d_mm": 180, "D_mm": 250, "B_mm": 42, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 391, "static_load_kN": 695, "fatigue_load_limit_kN": 75, "max_rpm": 1400, "reference_speed_rpm": 1100, "limiting_speed_rpm": 1400, "weight_g": 6200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NCF2936-CV is the 180 mm bore entry in the NCF2900 range: a 180×250×42 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 391 kN / C0 695 kN. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. With C 391 kN and C0 695 kN, size the bearing on the 180×250 mm ISO 15 envelope and check the 75 kN Pu against the equivalent-load floor; the catalogue lists 1,100 r/min thermal reference speed and 1,400 r/min mechanical limiting speed. Fit practice for NCF2936-CV: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "heavy offshore winch drums", "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 1,400 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 42 mm-wide ring and concentrates load.", "The 391/695 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2936-CV?", "a": "SKF NCF 2936 CV is a single-row full-complement cylindrical roller bearing with 180 mm bore, 250 mm OD and 42 mm width per ISO 15. SKF lists C 391 kN, C0 695 kN, Pu 75 kN, reference speed 1,100 r/min and limiting speed 1,400 r/min, mass about 6200 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF2936-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF2936-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF2936", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2936-CV", "SKF NCF 2936 CV" ], "locale_variants": {} }, { "sku": "NCF2938-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 2938 CV", "series": "NCF2900-series", "type": "cylindrical_roller", "d_mm": 190, "D_mm": 260, "B_mm": 42, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 440, "static_load_kN": 780, "fatigue_load_limit_kN": 81.5, "max_rpm": 1400, "reference_speed_rpm": 1100, "limiting_speed_rpm": 1400, "weight_g": 6500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NCF 2938 CV is a single-row full-complement cylindrical roller bearing sized 190×260×42 mm — a dimension series 29 (compact OD, normal width), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The radial section height is 35.0 mm and the catalogue mass 6500 g; at 440 kN dynamic rating this is roughly 2.32 kN of C per millimetre of bore before application factors. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 190 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts", "heavy offshore winch drums" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 1,400 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 260 mm raceway.", "The 440/780 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2938-CV?", "a": "SKF NCF 2938 CV is a single-row full-complement cylindrical roller bearing with 190 mm bore, 260 mm OD and 42 mm width per ISO 15. SKF lists C 440 kN, C0 780 kN, Pu 81.5 kN, reference speed 1,100 r/min and limiting speed 1,400 r/min, mass about 6500 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF2938-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF2938-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF2938", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2938-CV", "SKF NCF 2938 CV" ], "locale_variants": {} }, { "sku": "NCF2940-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 2940 CV", "series": "NCF2900-series", "type": "cylindrical_roller", "d_mm": 200, "D_mm": 280, "B_mm": 48, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 528, "static_load_kN": 965, "fatigue_load_limit_kN": 100, "max_rpm": 1300, "reference_speed_rpm": 1000, "limiting_speed_rpm": 1300, "weight_g": 9100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NCF2940-CV is the 200 mm bore entry in the NCF2900 range: a 200×280×48 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 528 kN / C0 965 kN. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Load-per-bore for the 200 mm seat is about 2.64 kN/mm, typical of dimension series 29 (compact OD, normal width); use C0 965 kN for static checks such as crane hook blocks standing under load. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 200 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "mining crusher eccentric shafts", "heavy offshore winch drums", "large rolling-mill and continuous-caster drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 1,300 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 48 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 48 mm-wide ring and concentrates load.", "The 528/965 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2940-CV?", "a": "SKF NCF 2940 CV is a single-row full-complement cylindrical roller bearing with 200 mm bore, 280 mm OD and 48 mm width per ISO 15. SKF lists C 528 kN, C0 965 kN, Pu 100 kN, reference speed 1,000 r/min and limiting speed 1,300 r/min, mass about 9100 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF2940-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF2940-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF2940", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2940-CV", "SKF NCF 2940 CV" ], "locale_variants": {} }, { "sku": "NCF2944-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 2944 CV", "series": "NCF2900-series", "type": "cylindrical_roller", "d_mm": 220, "D_mm": 300, "B_mm": 48, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 550, "static_load_kN": 1060, "fatigue_load_limit_kN": 106, "max_rpm": 1200, "reference_speed_rpm": 900, "limiting_speed_rpm": 1200, "weight_g": 9900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NCF 2944 CV resolves to a 220×300×48 mm single-row full-complement cylindrical roller bearing (dimension series 29 (compact OD, normal width)); a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 220 mm seat is about 2.50 kN/mm, typical of dimension series 29 (compact OD, normal width); use C0 1060 kN for static checks such as crane hook blocks standing under load. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 220 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "heavy offshore winch drums", "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 1,200 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 48 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 300 mm raceway.", "The 550/1060 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2944-CV?", "a": "SKF NCF 2944 CV is a single-row full-complement cylindrical roller bearing with 220 mm bore, 300 mm OD and 48 mm width per ISO 15. SKF lists C 550 kN, C0 1060 kN, Pu 106 kN, reference speed 900 r/min and limiting speed 1,200 r/min, mass about 9900 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF2944-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF2944-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF2944", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2944-CV", "SKF NCF 2944 CV" ], "locale_variants": {} }, { "sku": "NCF2948-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 2948 CV", "series": "NCF2900-series", "type": "cylindrical_roller", "d_mm": 240, "D_mm": 320, "B_mm": 48, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 583, "static_load_kN": 1140, "fatigue_load_limit_kN": 114, "max_rpm": 1100, "reference_speed_rpm": 850, "limiting_speed_rpm": 1100, "weight_g": 10500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 2948 CV denotes a single-row full-complement cylindrical roller bearing on the ISO 15 240×320×48 mm envelope, dimension series 29 (compact OD, normal width), with catalogue mass 10500 g. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Speed planning for NCF2948-CV: the catalogue lists 850 r/min thermal reference speed and 1,100 r/min mechanical limiting speed. The mass entry 10500 g covers the complete catalogue execution. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "heavy offshore winch drums", "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 1,100 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 48 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 320 mm raceway.", "The 583/1140 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2948-CV?", "a": "SKF NCF 2948 CV is a single-row full-complement cylindrical roller bearing with 240 mm bore, 320 mm OD and 48 mm width per ISO 15. SKF lists C 583 kN, C0 1140 kN, Pu 114 kN, reference speed 850 r/min and limiting speed 1,100 r/min, mass about 10500 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF2948-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF2948-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF2948", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2948-CV", "SKF NCF 2948 CV" ], "locale_variants": {} }, { "sku": "NCF2952-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 2952 CV", "series": "NCF2900-series", "type": "cylindrical_roller", "d_mm": 260, "D_mm": 360, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 737, "static_load_kN": 1430, "fatigue_load_limit_kN": 143, "max_rpm": 950, "reference_speed_rpm": 750, "limiting_speed_rpm": 950, "weight_g": 18000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NCF 2952 CV is a single-row full-complement cylindrical roller bearing sized 260×360×60 mm — a dimension series 29 (compact OD, normal width), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 1.94 (1430 against 737 kN), and the Pu figure 143 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 750 r/min thermal reference speed and 950 r/min mechanical limiting speed. Fit practice for NCF2952-CV: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "mining crusher eccentric shafts", "heavy offshore winch drums", "large rolling-mill and continuous-caster drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 950 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 737/1430 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2952-CV?", "a": "SKF NCF 2952 CV is a single-row full-complement cylindrical roller bearing with 260 mm bore, 360 mm OD and 60 mm width per ISO 15. SKF lists C 737 kN, C0 1430 kN, Pu 143 kN, reference speed 750 r/min and limiting speed 950 r/min, mass about 18000 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF2952-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF2952-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF2952", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2952-CV", "SKF NCF 2952 CV" ], "locale_variants": {} }, { "sku": "NCF2956-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 2956 CV", "series": "NCF2900-series", "type": "cylindrical_roller", "d_mm": 280, "D_mm": 380, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 880, "static_load_kN": 1730, "fatigue_load_limit_kN": 166, "max_rpm": 900, "reference_speed_rpm": 700, "limiting_speed_rpm": 900, "weight_g": 19500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 280 mm shaft, SKF lists NCF2956-CV as single-row full-complement cylindrical roller: 380 mm OD, 60 mm wide, Pu 166 kN, the catalogue lists 700 r/min thermal reference speed and 900 r/min mechanical limiting speed. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 1.97 (1730 against 880 kN), and the Pu figure 166 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 700 r/min thermal reference speed and 900 r/min mechanical limiting speed. Fit practice for NCF2956-CV: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "heavy offshore winch drums", "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 900 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 60 mm-wide ring and concentrates load.", "The 880/1730 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2956-CV?", "a": "SKF NCF 2956 CV is a single-row full-complement cylindrical roller bearing with 280 mm bore, 380 mm OD and 60 mm width per ISO 15. SKF lists C 880 kN, C0 1730 kN, Pu 166 kN, reference speed 700 r/min and limiting speed 900 r/min, mass about 19500 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF2956-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF2956-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF2956", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2956-CV", "SKF NCF 2956 CV" ], "locale_variants": {} }, { "sku": "NCF2960-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 2960 CV", "series": "NCF2900-series", "type": "cylindrical_roller", "d_mm": 300, "D_mm": 420, "B_mm": 72, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1120, "static_load_kN": 2200, "fatigue_load_limit_kN": 208, "max_rpm": 800, "reference_speed_rpm": 630, "limiting_speed_rpm": 800, "weight_g": 31000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 300 mm shaft, SKF lists NCF2960-CV as single-row full-complement cylindrical roller: 420 mm OD, 72 mm wide, Pu 208 kN, the catalogue lists 630 r/min thermal reference speed and 800 r/min mechanical limiting speed. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. The radial section height is 60.0 mm and the catalogue mass 31000 g; at 1120 kN dynamic rating this is roughly 3.73 kN of C per millimetre of bore before application factors. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 300 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts", "heavy offshore winch drums" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 800 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 420 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 72 mm-wide ring and concentrates load.", "The 1120/2200 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2960-CV?", "a": "SKF NCF 2960 CV is a single-row full-complement cylindrical roller bearing with 300 mm bore, 420 mm OD and 72 mm width per ISO 15. SKF lists C 1120 kN, C0 2200 kN, Pu 208 kN, reference speed 630 r/min and limiting speed 800 r/min, mass about 31000 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF2960-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF2960-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF2960", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2960-CV", "SKF NCF 2960 CV" ], "locale_variants": {} }, { "sku": "NCF2964-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 2964 V", "series": "NCF2900-series", "type": "cylindrical_roller", "d_mm": 320, "D_mm": 440, "B_mm": 72, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1140, "static_load_kN": 2360, "fatigue_load_limit_kN": 220, "max_rpm": 750, "reference_speed_rpm": 600, "limiting_speed_rpm": 750, "weight_g": 33000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 320 mm shaft, SKF lists NCF2964-V as single-row full-complement cylindrical roller: 440 mm OD, 72 mm wide, Pu 220 kN, the catalogue lists 600 r/min thermal reference speed and 750 r/min mechanical limiting speed. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Load-per-bore for the 320 mm seat is about 3.56 kN/mm, typical of dimension series 29 (compact OD, normal width); use C0 2360 kN for static checks such as crane hook blocks standing under load. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 320 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "mining crusher eccentric shafts", "heavy offshore winch drums", "large rolling-mill and continuous-caster drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 750 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 72 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 72 mm-wide ring and concentrates load.", "The 1140/2360 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2964-V?", "a": "SKF NCF 2964 V is a single-row full-complement cylindrical roller bearing with 320 mm bore, 440 mm OD and 72 mm width per ISO 15. SKF lists C 1140 kN, C0 2360 kN, Pu 220 kN, reference speed 600 r/min and limiting speed 750 r/min, mass about 33000 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF2964-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF2964-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF2964", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2964-V", "SKF NCF 2964 V" ], "locale_variants": {} }, { "sku": "NCF2968-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 2968 V", "series": "NCF2900-series", "type": "cylindrical_roller", "d_mm": 340, "D_mm": 460, "B_mm": 72, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1190, "static_load_kN": 2500, "fatigue_load_limit_kN": 228, "max_rpm": 700, "reference_speed_rpm": 560, "limiting_speed_rpm": 700, "weight_g": 35000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 2968 V denotes a single-row full-complement cylindrical roller bearing on the ISO 15 340×460×72 mm envelope, dimension series 29 (compact OD, normal width), with catalogue mass 35000 g. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix V: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. The radial section height is 60.0 mm and the catalogue mass 35000 g; at 1190 kN dynamic rating this is roughly 3.50 kN of C per millimetre of bore before application factors. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "mining crusher eccentric shafts", "heavy offshore winch drums", "large rolling-mill and continuous-caster drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 700 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 72 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 72 mm-wide ring and concentrates load.", "The 1190/2500 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2968-V?", "a": "SKF NCF 2968 V is a single-row full-complement cylindrical roller bearing with 340 mm bore, 460 mm OD and 72 mm width per ISO 15. SKF lists C 1190 kN, C0 2500 kN, Pu 228 kN, reference speed 560 r/min and limiting speed 700 r/min, mass about 35000 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF2968-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF2968-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF2968", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2968-V", "SKF NCF 2968 V" ], "locale_variants": {} }, { "sku": "NCF2972-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 2972 CV", "series": "NCF2900-series", "type": "cylindrical_roller", "d_mm": 360, "D_mm": 480, "B_mm": 72, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1230, "static_load_kN": 2600, "fatigue_load_limit_kN": 240, "max_rpm": 670, "reference_speed_rpm": 530, "limiting_speed_rpm": 670, "weight_g": 36500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NCF 2972 CV resolves to a 360×480×72 mm single-row full-complement cylindrical roller bearing (dimension series 29 (compact OD, normal width)); a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. With C 1230 kN and C0 2600 kN, size the bearing on the 360×480 mm ISO 15 envelope and check the 240 kN Pu against the equivalent-load floor; the catalogue lists 530 r/min thermal reference speed and 670 r/min mechanical limiting speed. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts", "heavy offshore winch drums" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 670 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 72 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 1230/2600 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2972-CV?", "a": "SKF NCF 2972 CV is a single-row full-complement cylindrical roller bearing with 360 mm bore, 480 mm OD and 72 mm width per ISO 15. SKF lists C 1230 kN, C0 2600 kN, Pu 240 kN, reference speed 530 r/min and limiting speed 670 r/min, mass about 36500 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF2972-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF2972-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF2972", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2972-CV", "SKF NCF 2972 CV" ], "locale_variants": {} }, { "sku": "NCF2976-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 2976 V", "series": "NCF2900-series", "type": "cylindrical_roller", "d_mm": 380, "D_mm": 520, "B_mm": 82, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1570, "static_load_kN": 3250, "fatigue_load_limit_kN": 300, "max_rpm": 630, "reference_speed_rpm": 500, "limiting_speed_rpm": 630, "weight_g": 52000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 2976 V denotes a single-row full-complement cylindrical roller bearing on the ISO 15 380×520×82 mm envelope, dimension series 29 (compact OD, normal width), with catalogue mass 52000 g. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 2.07 (3250 against 1570 kN), and the Pu figure 300 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 500 r/min thermal reference speed and 630 r/min mechanical limiting speed. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "heavy offshore winch drums", "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 630 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 520 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 1570/3250 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2976-V?", "a": "SKF NCF 2976 V is a single-row full-complement cylindrical roller bearing with 380 mm bore, 520 mm OD and 82 mm width per ISO 15. SKF lists C 1570 kN, C0 3250 kN, Pu 300 kN, reference speed 500 r/min and limiting speed 630 r/min, mass about 52000 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF2976-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF2976-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF2976", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2976-V", "SKF NCF 2976 V" ], "locale_variants": {} }, { "sku": "NCF2980-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 2980 CV", "series": "NCF2900-series", "type": "cylindrical_roller", "d_mm": 400, "D_mm": 540, "B_mm": 82, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1650, "static_load_kN": 3450, "fatigue_load_limit_kN": 310, "max_rpm": 600, "reference_speed_rpm": 480, "limiting_speed_rpm": 600, "weight_g": 54500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NCF 2980 CV is a single-row full-complement cylindrical roller bearing sized 400×540×82 mm — a dimension series 29 (compact OD, normal width), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Load-per-bore for the 400 mm seat is about 4.13 kN/mm, typical of dimension series 29 (compact OD, normal width); use C0 3450 kN for static checks such as crane hook blocks standing under load. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 400 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts", "heavy offshore winch drums" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 600 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 540 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 82 mm-wide ring and concentrates load.", "The 1650/3450 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2980-CV?", "a": "SKF NCF 2980 CV is a single-row full-complement cylindrical roller bearing with 400 mm bore, 540 mm OD and 82 mm width per ISO 15. SKF lists C 1650 kN, C0 3450 kN, Pu 310 kN, reference speed 480 r/min and limiting speed 600 r/min, mass about 54500 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF2980-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF2980-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF2980", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2980-CV", "SKF NCF 2980 CV" ], "locale_variants": {} }, { "sku": "NCF2984-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 2984 V", "series": "NCF2900-series", "type": "cylindrical_roller", "d_mm": 420, "D_mm": 560, "B_mm": 82, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1650, "static_load_kN": 3600, "fatigue_load_limit_kN": 315, "max_rpm": 560, "reference_speed_rpm": 450, "limiting_speed_rpm": 560, "weight_g": 57000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 2984 V denotes a single-row full-complement cylindrical roller bearing on the ISO 15 420×560×82 mm envelope, dimension series 29 (compact OD, normal width), with catalogue mass 57000 g. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Speed planning for NCF2984-V: the catalogue lists 450 r/min thermal reference speed and 560 r/min mechanical limiting speed. The mass entry 57000 g covers the complete catalogue execution. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "heavy offshore winch drums", "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 560 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 82 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 560 mm raceway.", "The 1650/3600 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2984-V?", "a": "SKF NCF 2984 V is a single-row full-complement cylindrical roller bearing with 420 mm bore, 560 mm OD and 82 mm width per ISO 15. SKF lists C 1650 kN, C0 3600 kN, Pu 315 kN, reference speed 450 r/min and limiting speed 560 r/min, mass about 57000 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF2984-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF2984-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF2984", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2984-V", "SKF NCF 2984 V" ], "locale_variants": {} }, { "sku": "NCF2988-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 2988 V", "series": "NCF2900-series", "type": "cylindrical_roller", "d_mm": 440, "D_mm": 600, "B_mm": 95, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 2010, "static_load_kN": 4400, "fatigue_load_limit_kN": 380, "max_rpm": 530, "reference_speed_rpm": 430, "limiting_speed_rpm": 530, "weight_g": 80000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NCF2988-V is the 440 mm bore entry in the NCF2900 range: a 440×600×95 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 2010 kN / C0 4400 kN. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix V: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 2.19 (4400 against 2010 kN), and the Pu figure 380 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 430 r/min thermal reference speed and 530 r/min mechanical limiting speed. Fit practice for NCF2988-V: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "heavy offshore winch drums", "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 530 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 95 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 600 mm raceway.", "The 2010/4400 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2988-V?", "a": "SKF NCF 2988 V is a single-row full-complement cylindrical roller bearing with 440 mm bore, 600 mm OD and 95 mm width per ISO 15. SKF lists C 2010 kN, C0 4400 kN, Pu 380 kN, reference speed 430 r/min and limiting speed 530 r/min, mass about 80000 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF2988-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF2988-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF2988", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2988-V", "SKF NCF 2988 V" ], "locale_variants": {} }, { "sku": "NCF2992-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 2992 V", "series": "NCF2900-series", "type": "cylindrical_roller", "d_mm": 460, "D_mm": 620, "B_mm": 95, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 2050, "static_load_kN": 4500, "fatigue_load_limit_kN": 390, "max_rpm": 500, "reference_speed_rpm": 400, "limiting_speed_rpm": 500, "weight_g": 83000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NCF 2992 V is a single-row full-complement cylindrical roller bearing sized 460×620×95 mm — a dimension series 29 (compact OD, normal width), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Speed planning for NCF2992-V: the catalogue lists 400 r/min thermal reference speed and 500 r/min mechanical limiting speed. The mass entry 83000 g covers the complete catalogue execution. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "mining crusher eccentric shafts", "heavy offshore winch drums", "large rolling-mill and continuous-caster drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 500 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 620 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 620 mm raceway.", "The 2050/4500 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2992-V?", "a": "SKF NCF 2992 V is a single-row full-complement cylindrical roller bearing with 460 mm bore, 620 mm OD and 95 mm width per ISO 15. SKF lists C 2050 kN, C0 4500 kN, Pu 390 kN, reference speed 400 r/min and limiting speed 500 r/min, mass about 83000 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF2992-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF2992-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF2992", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2992-V", "SKF NCF 2992 V" ], "locale_variants": {} }, { "sku": "NCF2996-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 2996 V", "series": "NCF2900-series", "type": "cylindrical_roller", "d_mm": 480, "D_mm": 650, "B_mm": 100, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 2290, "static_load_kN": 4900, "fatigue_load_limit_kN": 405, "max_rpm": 480, "reference_speed_rpm": 380, "limiting_speed_rpm": 480, "weight_g": 93000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NCF2996-V is the 480 mm bore entry in the NCF2900 range: a 480×650×100 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 2290 kN / C0 4900 kN. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 2.14 (4900 against 2290 kN), and the Pu figure 405 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 380 r/min thermal reference speed and 480 r/min mechanical limiting speed. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "mining crusher eccentric shafts", "heavy offshore winch drums", "large rolling-mill and continuous-caster drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 480 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 650 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 650 mm raceway.", "The 2290/4900 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF2996-V?", "a": "SKF NCF 2996 V is a single-row full-complement cylindrical roller bearing with 480 mm bore, 650 mm OD and 100 mm width per ISO 15. SKF lists C 2290 kN, C0 4900 kN, Pu 405 kN, reference speed 380 r/min and limiting speed 480 r/min, mass about 93000 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF2996-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF2996-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF2996", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF2996-V", "SKF NCF 2996 V" ], "locale_variants": {} }, { "sku": "NCF30-500-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 30/500 CV", "series": "NCF3000-series", "type": "cylindrical_roller", "d_mm": 500, "D_mm": 720, "B_mm": 167, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 3800, "static_load_kN": 7500, "fatigue_load_limit_kN": 570, "max_rpm": 450, "reference_speed_rpm": 360, "limiting_speed_rpm": 450, "weight_g": 215000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 30/500 CV denotes a single-row full-complement cylindrical roller bearing on the ISO 15 500×720×167 mm envelope, dimension series 30 (compact OD, normal width), with catalogue mass 215000 g. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. The radial section height is 110.0 mm and the catalogue mass 215000 g; at 3800 kN dynamic rating this is roughly 7.60 kN of C per millimetre of bore before application factors. Fit practice for NCF30-500-CV: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "heavy offshore winch drums", "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 450 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 720 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 3800/7500 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF30-500-CV?", "a": "SKF NCF 30/500 CV is a single-row full-complement cylindrical roller bearing with 500 mm bore, 720 mm OD and 167 mm width per ISO 15. SKF lists C 3800 kN, C0 7500 kN, Pu 570 kN, reference speed 360 r/min and limiting speed 450 r/min, mass about 215000 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF30-500-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF30-500-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF30", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF30-500-CV", "SKF NCF 30/500 CV" ], "locale_variants": {} }, { "sku": "NCF30-530-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 30/530 V", "series": "NCF3000-series", "type": "cylindrical_roller", "d_mm": 530, "D_mm": 780, "B_mm": 185, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 5230, "static_load_kN": 10600, "fatigue_load_limit_kN": 780, "max_rpm": 400, "reference_speed_rpm": 320, "limiting_speed_rpm": 400, "weight_g": 300000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NCF30-530-V is the 530 mm bore entry in the NCF3000 range: a 530×780×185 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 5230 kN / C0 10600 kN. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix V: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 530 mm seat is about 9.87 kN/mm, typical of dimension series 30 (compact OD, normal width); use C0 10600 kN for static checks such as crane hook blocks standing under load. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "mining crusher eccentric shafts", "heavy offshore winch drums", "large rolling-mill and continuous-caster drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 400 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 185 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 185 mm-wide ring and concentrates load.", "The 5230/10600 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF30-530-V?", "a": "SKF NCF 30/530 V is a single-row full-complement cylindrical roller bearing with 530 mm bore, 780 mm OD and 185 mm width per ISO 15. SKF lists C 5230 kN, C0 10600 kN, Pu 780 kN, reference speed 320 r/min and limiting speed 400 r/min, mass about 300000 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF30-530-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF30-530-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF30", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF30-530-V", "SKF NCF 30/530 V" ], "locale_variants": {} }, { "sku": "NCF30-560-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 30/560 V", "series": "NCF3000-series", "type": "cylindrical_roller", "d_mm": 560, "D_mm": 820, "B_mm": 195, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 5830, "static_load_kN": 11800, "fatigue_load_limit_kN": 865, "max_rpm": 380, "reference_speed_rpm": 300, "limiting_speed_rpm": 380, "weight_g": 345000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 30/560 V denotes a single-row full-complement cylindrical roller bearing on the ISO 15 560×820×195 mm envelope, dimension series 30 (compact OD, normal width), with catalogue mass 345000 g. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The radial section height is 130.0 mm and the catalogue mass 345000 g; at 5830 kN dynamic rating this is roughly 10.41 kN of C per millimetre of bore before application factors. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 560 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "heavy offshore winch drums", "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 380 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 195 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 820 mm raceway.", "The 5830/11800 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF30-560-V?", "a": "SKF NCF 30/560 V is a single-row full-complement cylindrical roller bearing with 560 mm bore, 820 mm OD and 195 mm width per ISO 15. SKF lists C 5830 kN, C0 11800 kN, Pu 865 kN, reference speed 300 r/min and limiting speed 380 r/min, mass about 345000 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF30-560-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF30-560-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF30", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF30-560-V", "SKF NCF 30/560 V" ], "locale_variants": {} }, { "sku": "NCF3004-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 3004 CV", "series": "NCF3000-series", "type": "cylindrical_roller", "d_mm": 20, "D_mm": 42, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 28.1, "static_load_kN": 28.5, "fatigue_load_limit_kN": 3.1, "max_rpm": 10000, "reference_speed_rpm": 8500, "limiting_speed_rpm": 10000, "weight_g": 110, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NCF 3004 CV is a single-row full-complement cylindrical roller bearing sized 20×42×16 mm — a dimension series 30 (compact OD, normal width), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 20 mm seat is about 1.41 kN/mm, typical of dimension series 30 (compact OD, normal width); use C0 28.5 kN for static checks such as crane hook blocks standing under load. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "small gearbox low-speed shafts", "machine-tool indexing drives", "crane trolley wheel hubs" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 10,000 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 16 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 16 mm-wide ring and concentrates load.", "The 28.1/28.5 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF3004-CV?", "a": "SKF NCF 3004 CV is a single-row full-complement cylindrical roller bearing with 20 mm bore, 42 mm OD and 16 mm width per ISO 15. SKF lists C 28.1 kN, C0 28.5 kN, Pu 3.1 kN, reference speed 8,500 r/min and limiting speed 10,000 r/min, mass about 110 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF3004-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF3004-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF3004", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF3004-CV", "SKF NCF 3004 CV" ], "locale_variants": {} }, { "sku": "NCF3005-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 3005 CV", "series": "NCF3000-series", "type": "cylindrical_roller", "d_mm": 25, "D_mm": 47, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 31.9, "static_load_kN": 35.5, "fatigue_load_limit_kN": 3.8, "max_rpm": 9000, "reference_speed_rpm": 7000, "limiting_speed_rpm": 9000, "weight_g": 120, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 3005 CV denotes a single-row full-complement cylindrical roller bearing on the ISO 15 25×47×16 mm envelope, dimension series 30 (compact OD, normal width), with catalogue mass 120 g. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. The radial section height is 11.0 mm and the catalogue mass 120 g; at 31.9 kN dynamic rating this is roughly 1.28 kN of C per millimetre of bore before application factors. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 25 mm seat normally takes a k5 interference with an H7 housing bore when the inner ring rotates.", "applications": [ "crane trolley wheel hubs", "small gearbox low-speed shafts", "machine-tool indexing drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 9,000 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 16 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 31.9/35.5 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF3005-CV?", "a": "SKF NCF 3005 CV is a single-row full-complement cylindrical roller bearing with 25 mm bore, 47 mm OD and 16 mm width per ISO 15. SKF lists C 31.9 kN, C0 35.5 kN, Pu 3.8 kN, reference speed 7,000 r/min and limiting speed 9,000 r/min, mass about 120 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF3005-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF3005-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF3005", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF3005-CV", "SKF NCF 3005 CV" ], "locale_variants": {} }, { "sku": "NCF3006-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 3006 CV", "series": "NCF3000-series", "type": "cylindrical_roller", "d_mm": 30, "D_mm": 55, "B_mm": 19, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 39.6, "static_load_kN": 44, "fatigue_load_limit_kN": 5.3, "max_rpm": 15000, "reference_speed_rpm": 13000, "limiting_speed_rpm": 15000, "weight_g": 200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NCF 3006 CV resolves to a 30×55×19 mm single-row full-complement cylindrical roller bearing (dimension series 30 (compact OD, normal width)); a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Speed planning for NCF3006-CV: the catalogue lists 13,000 r/min thermal reference speed and 15,000 r/min mechanical limiting speed. The mass entry 200 g covers the complete catalogue execution. Fit practice for NCF3006-CV: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "slew and swing drives", "heavy gearbox output shafts", "crane travel-wheel bearings", "rolling-mill table rollers" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 15,000 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 19 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 55 mm raceway.", "The 39.6/44 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF3006-CV?", "a": "SKF NCF 3006 CV is a single-row full-complement cylindrical roller bearing with 30 mm bore, 55 mm OD and 19 mm width per ISO 15. SKF lists C 39.6 kN, C0 44 kN, Pu 5.3 kN, reference speed 13,000 r/min and limiting speed 15,000 r/min, mass about 200 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF3006-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF3006-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF3006", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF3006-CV", "SKF NCF 3006 CV" ], "locale_variants": {} }, { "sku": "NCF3007-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 3007 CV", "series": "NCF3000-series", "type": "cylindrical_roller", "d_mm": 35, "D_mm": 62, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 48.4, "static_load_kN": 56, "fatigue_load_limit_kN": 6.55, "max_rpm": 6700, "reference_speed_rpm": 5300, "limiting_speed_rpm": 6700, "weight_g": 260, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NCF3007-CV is the 35 mm bore entry in the NCF3000 range: a 35×62×20 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 48.4 kN / C0 56 kN. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The radial section height is 13.5 mm and the catalogue mass 260 g; at 48.4 kN dynamic rating this is roughly 1.38 kN of C per millimetre of bore before application factors. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 35 mm seat normally takes a k5 interference with an H7 housing bore when the inner ring rotates.", "applications": [ "crane travel-wheel bearings", "rolling-mill table rollers", "slew and swing drives", "heavy gearbox output shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 6,700 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 20 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 62 mm raceway.", "The 48.4/56 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF3007-CV?", "a": "SKF NCF 3007 CV is a single-row full-complement cylindrical roller bearing with 35 mm bore, 62 mm OD and 20 mm width per ISO 15. SKF lists C 48.4 kN, C0 56 kN, Pu 6.55 kN, reference speed 5,300 r/min and limiting speed 6,700 r/min, mass about 260 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF3007-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF3007-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF3007", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF3007-CV", "SKF NCF 3007 CV" ], "locale_variants": {} }, { "sku": "NCF3008-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 3008 CV", "series": "NCF3000-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 68, "B_mm": 21, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 57.2, "static_load_kN": 69.5, "fatigue_load_limit_kN": 8.15, "max_rpm": 6000, "reference_speed_rpm": 4800, "limiting_speed_rpm": 6000, "weight_g": 310, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 40 mm shaft, SKF lists NCF3008-CV as single-row full-complement cylindrical roller: 68 mm OD, 21 mm wide, Pu 8.15 kN, the catalogue lists 4,800 r/min thermal reference speed and 6,000 r/min mechanical limiting speed. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Speed planning for NCF3008-CV: the catalogue lists 4,800 r/min thermal reference speed and 6,000 r/min mechanical limiting speed. The mass entry 310 g covers the complete catalogue execution. Fit practice for NCF3008-CV: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "rolling-mill table rollers", "slew and swing drives", "heavy gearbox output shafts", "crane travel-wheel bearings" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 6,000 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 21 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 21 mm-wide ring and concentrates load.", "The 57.2/69.5 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF3008-CV?", "a": "SKF NCF 3008 CV is a single-row full-complement cylindrical roller bearing with 40 mm bore, 68 mm OD and 21 mm width per ISO 15. SKF lists C 57.2 kN, C0 69.5 kN, Pu 8.15 kN, reference speed 4,800 r/min and limiting speed 6,000 r/min, mass about 310 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF3008-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF3008-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF3008", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF3008-CV", "SKF NCF 3008 CV" ], "locale_variants": {} }, { "sku": "NCF3009-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 3009 CV", "series": "NCF3000-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 75, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 60.5, "static_load_kN": 78, "fatigue_load_limit_kN": 9.15, "max_rpm": 5300, "reference_speed_rpm": 4300, "limiting_speed_rpm": 5300, "weight_g": 400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NCF 3009 CV is a single-row full-complement cylindrical roller bearing sized 45×75×23 mm — a dimension series 30 (compact OD, normal width), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 1.29 (78 against 60.5 kN), and the Pu figure 9.15 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 4,300 r/min thermal reference speed and 5,300 r/min mechanical limiting speed. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "slew and swing drives", "heavy gearbox output shafts", "crane travel-wheel bearings", "rolling-mill table rollers" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 5,300 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 23 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 60.5/78 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF3009-CV?", "a": "SKF NCF 3009 CV is a single-row full-complement cylindrical roller bearing with 45 mm bore, 75 mm OD and 23 mm width per ISO 15. SKF lists C 60.5 kN, C0 78 kN, Pu 9.15 kN, reference speed 4,300 r/min and limiting speed 5,300 r/min, mass about 400 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF3009-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF3009-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF3009", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF3009-CV", "SKF NCF 3009 CV" ], "locale_variants": {} }, { "sku": "NCF3010-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 3010 CV", "series": "NCF3000-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 80, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 76.5, "static_load_kN": 98, "fatigue_load_limit_kN": 11.8, "max_rpm": 5000, "reference_speed_rpm": 4000, "limiting_speed_rpm": 5000, "weight_g": 430, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NCF 3010 CV resolves to a 50×80×23 mm single-row full-complement cylindrical roller bearing (dimension series 30 (compact OD, normal width)); a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 1.28 (98 against 76.5 kN), and the Pu figure 11.8 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 4,000 r/min thermal reference speed and 5,000 r/min mechanical limiting speed. Fit practice for NCF3010-CV: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "rolling-mill table rollers", "slew and swing drives", "heavy gearbox output shafts", "crane travel-wheel bearings" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 5,000 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 76.5/98 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF3010-CV?", "a": "SKF NCF 3010 CV is a single-row full-complement cylindrical roller bearing with 50 mm bore, 80 mm OD and 23 mm width per ISO 15. SKF lists C 76.5 kN, C0 98 kN, Pu 11.8 kN, reference speed 4,000 r/min and limiting speed 5,000 r/min, mass about 430 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF3010-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF3010-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF3010", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF3010-CV", "SKF NCF 3010 CV" ], "locale_variants": {} }, { "sku": "NCF3011-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 3011 CV", "series": "NCF3000-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 90, "B_mm": 26, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 105, "static_load_kN": 140, "fatigue_load_limit_kN": 17.3, "max_rpm": 4300, "reference_speed_rpm": 3400, "limiting_speed_rpm": 4300, "weight_g": 640, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NCF3011-CV is the 55 mm bore entry in the NCF3000 range: a 55×90×26 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 105 kN / C0 140 kN. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. With C 105 kN and C0 140 kN, size the bearing on the 55×90 mm ISO 15 envelope and check the 17.3 kN Pu against the equivalent-load floor; the catalogue lists 3,400 r/min thermal reference speed and 4,300 r/min mechanical limiting speed. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "slew and swing drives", "heavy gearbox output shafts", "crane travel-wheel bearings", "rolling-mill table rollers" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 4,300 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 90 mm raceway.", "The 105/140 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF3011-CV?", "a": "SKF NCF 3011 CV is a single-row full-complement cylindrical roller bearing with 55 mm bore, 90 mm OD and 26 mm width per ISO 15. SKF lists C 105 kN, C0 140 kN, Pu 17.3 kN, reference speed 3,400 r/min and limiting speed 4,300 r/min, mass about 640 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF3011-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF3011-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF3011", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF3011-CV", "SKF NCF 3011 CV" ], "locale_variants": {} }, { "sku": "NCF3012-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 3012 CV", "series": "NCF3000-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 95, "B_mm": 26, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 106, "static_load_kN": 146, "fatigue_load_limit_kN": 18.3, "max_rpm": 4000, "reference_speed_rpm": 3400, "limiting_speed_rpm": 4000, "weight_g": 690, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 60 mm shaft, SKF lists NCF3012-CV as single-row full-complement cylindrical roller: 95 mm OD, 26 mm wide, Pu 18.3 kN, the catalogue lists 3,400 r/min thermal reference speed and 4,000 r/min mechanical limiting speed. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 1.38 (146 against 106 kN), and the Pu figure 18.3 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 3,400 r/min thermal reference speed and 4,000 r/min mechanical limiting speed. Fit practice for NCF3012-CV: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "heavy conveyor pulley bearings", "wind turbine rotor-lock and yaw drives", "large gearbox slow-speed stages", "rolling-mill auxiliary shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 4,000 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 95 mm raceway.", "The 106/146 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF3012-CV?", "a": "SKF NCF 3012 CV is a single-row full-complement cylindrical roller bearing with 60 mm bore, 95 mm OD and 26 mm width per ISO 15. SKF lists C 106 kN, C0 146 kN, Pu 18.3 kN, reference speed 3,400 r/min and limiting speed 4,000 r/min, mass about 690 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF3012-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF3012-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF3012", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF3012-CV", "SKF NCF 3012 CV" ], "locale_variants": {} }, { "sku": "NCF3013-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 3013 CV", "series": "NCF3000-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 100, "B_mm": 26, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 112, "static_load_kN": 163, "fatigue_load_limit_kN": 20, "max_rpm": 3800, "reference_speed_rpm": 3000, "limiting_speed_rpm": 3800, "weight_g": 730, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NCF 3013 CV is a single-row full-complement cylindrical roller bearing sized 65×100×26 mm — a dimension series 30 (compact OD, normal width), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. With C 112 kN and C0 163 kN, size the bearing on the 65×100 mm ISO 15 envelope and check the 20 kN Pu against the equivalent-load floor; the catalogue lists 3,000 r/min thermal reference speed and 3,800 r/min mechanical limiting speed. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "wind turbine rotor-lock and yaw drives", "large gearbox slow-speed stages", "rolling-mill auxiliary shafts", "heavy conveyor pulley bearings" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 3,800 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 26 mm-wide ring and concentrates load.", "The 112/163 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF3013-CV?", "a": "SKF NCF 3013 CV is a single-row full-complement cylindrical roller bearing with 65 mm bore, 100 mm OD and 26 mm width per ISO 15. SKF lists C 112 kN, C0 163 kN, Pu 20 kN, reference speed 3,000 r/min and limiting speed 3,800 r/min, mass about 730 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF3013-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF3013-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF3013", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF3013-CV", "SKF NCF 3013 CV" ], "locale_variants": {} }, { "sku": "NCF3014-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 3014 CV", "series": "NCF3000-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 110, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 128, "static_load_kN": 173, "fatigue_load_limit_kN": 22.4, "max_rpm": 7000, "reference_speed_rpm": 6000, "limiting_speed_rpm": 7000, "weight_g": 1000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 3014 CV denotes a single-row full-complement cylindrical roller bearing on the ISO 15 70×110×30 mm envelope, dimension series 30 (compact OD, normal width), with catalogue mass 1000 g. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 70 mm seat is about 1.83 kN/mm, typical of dimension series 30 (compact OD, normal width); use C0 173 kN for static checks such as crane hook blocks standing under load. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 70 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "large gearbox slow-speed stages", "rolling-mill auxiliary shafts", "heavy conveyor pulley bearings", "wind turbine rotor-lock and yaw drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 7,000 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 128/173 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF3014-CV?", "a": "SKF NCF 3014 CV is a single-row full-complement cylindrical roller bearing with 70 mm bore, 110 mm OD and 30 mm width per ISO 15. SKF lists C 128 kN, C0 173 kN, Pu 22.4 kN, reference speed 6,000 r/min and limiting speed 7,000 r/min, mass about 1000 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF3014-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF3014-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF3014", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF3014-CV", "SKF NCF 3014 CV" ], "locale_variants": {} }, { "sku": "NCF3015-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 3015 CV", "series": "NCF3000-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 115, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 134, "static_load_kN": 190, "fatigue_load_limit_kN": 24.5, "max_rpm": 3200, "reference_speed_rpm": 2600, "limiting_speed_rpm": 3200, "weight_g": 1050, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NCF 3015 CV resolves to a 75×115×30 mm single-row full-complement cylindrical roller bearing (dimension series 30 (compact OD, normal width)); a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. With C 134 kN and C0 190 kN, size the bearing on the 75×115 mm ISO 15 envelope and check the 24.5 kN Pu against the equivalent-load floor; the catalogue lists 2,600 r/min thermal reference speed and 3,200 r/min mechanical limiting speed. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "heavy conveyor pulley bearings", "wind turbine rotor-lock and yaw drives", "large gearbox slow-speed stages", "rolling-mill auxiliary shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 3,200 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 134/190 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF3015-CV?", "a": "SKF NCF 3015 CV is a single-row full-complement cylindrical roller bearing with 75 mm bore, 115 mm OD and 30 mm width per ISO 15. SKF lists C 134 kN, C0 190 kN, Pu 24.5 kN, reference speed 2,600 r/min and limiting speed 3,200 r/min, mass about 1050 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF3015-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF3015-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF3015", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF3015-CV", "SKF NCF 3015 CV" ], "locale_variants": {} }, { "sku": "NCF3016-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 3016 CV", "series": "NCF3000-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 125, "B_mm": 34, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 165, "static_load_kN": 228, "fatigue_load_limit_kN": 29, "max_rpm": 3000, "reference_speed_rpm": 2400, "limiting_speed_rpm": 3000, "weight_g": 1450, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NCF3016-CV is the 80 mm bore entry in the NCF3000 range: a 80×125×34 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 165 kN / C0 228 kN. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 80 mm seat is about 2.06 kN/mm, typical of dimension series 30 (compact OD, normal width); use C0 228 kN for static checks such as crane hook blocks standing under load. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 80 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "wind turbine rotor-lock and yaw drives", "large gearbox slow-speed stages", "rolling-mill auxiliary shafts", "heavy conveyor pulley bearings" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 3,000 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 125 mm raceway.", "The 165/228 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF3016-CV?", "a": "SKF NCF 3016 CV is a single-row full-complement cylindrical roller bearing with 80 mm bore, 125 mm OD and 34 mm width per ISO 15. SKF lists C 165 kN, C0 228 kN, Pu 29 kN, reference speed 2,400 r/min and limiting speed 3,000 r/min, mass about 1450 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF3016-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF3016-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF3016", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF3016-CV", "SKF NCF 3016 CV" ], "locale_variants": {} }, { "sku": "NCF3017-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 3017 CV", "series": "NCF3000-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 130, "B_mm": 34, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 172, "static_load_kN": 236, "fatigue_load_limit_kN": 30, "max_rpm": 3000, "reference_speed_rpm": 2400, "limiting_speed_rpm": 3000, "weight_g": 1500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 85 mm shaft, SKF lists NCF3017-CV as single-row full-complement cylindrical roller: 130 mm OD, 34 mm wide, Pu 30 kN, the catalogue lists 2,400 r/min thermal reference speed and 3,000 r/min mechanical limiting speed. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. With C 172 kN and C0 236 kN, size the bearing on the 85×130 mm ISO 15 envelope and check the 30 kN Pu against the equivalent-load floor; the catalogue lists 2,400 r/min thermal reference speed and 3,000 r/min mechanical limiting speed. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "rolling-mill auxiliary shafts", "heavy conveyor pulley bearings", "wind turbine rotor-lock and yaw drives", "large gearbox slow-speed stages" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 3,000 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 130 mm raceway.", "The 172/236 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF3017-CV?", "a": "SKF NCF 3017 CV is a single-row full-complement cylindrical roller bearing with 85 mm bore, 130 mm OD and 34 mm width per ISO 15. SKF lists C 172 kN, C0 236 kN, Pu 30 kN, reference speed 2,400 r/min and limiting speed 3,000 r/min, mass about 1500 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF3017-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF3017-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF3017", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF3017-CV", "SKF NCF 3017 CV" ], "locale_variants": {} }, { "sku": "NCF3018-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 3018 CV", "series": "NCF3000-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 140, "B_mm": 37, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 198, "static_load_kN": 280, "fatigue_load_limit_kN": 35.5, "max_rpm": 2800, "reference_speed_rpm": 2200, "limiting_speed_rpm": 2800, "weight_g": 1950, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NCF 3018 CV is a single-row full-complement cylindrical roller bearing sized 90×140×37 mm — a dimension series 30 (compact OD, normal width), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Load-per-bore for the 90 mm seat is about 2.20 kN/mm, typical of dimension series 30 (compact OD, normal width); use C0 280 kN for static checks such as crane hook blocks standing under load. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 90 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "heavy conveyor pulley bearings", "wind turbine rotor-lock and yaw drives", "large gearbox slow-speed stages", "rolling-mill auxiliary shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 2,800 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 37 mm-wide ring and concentrates load.", "The 198/280 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF3018-CV?", "a": "SKF NCF 3018 CV is a single-row full-complement cylindrical roller bearing with 90 mm bore, 140 mm OD and 37 mm width per ISO 15. SKF lists C 198 kN, C0 280 kN, Pu 35.5 kN, reference speed 2,200 r/min and limiting speed 2,800 r/min, mass about 1950 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF3018-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF3018-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF3018", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF3018-CV", "SKF NCF 3018 CV" ], "locale_variants": {} }, { "sku": "NCF3020-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 3020 CV", "series": "NCF3000-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 150, "B_mm": 37, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 209, "static_load_kN": 310, "fatigue_load_limit_kN": 37.5, "max_rpm": 2600, "reference_speed_rpm": 2000, "limiting_speed_rpm": 2600, "weight_g": 2150, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NCF 3020 CV resolves to a 100×150×37 mm single-row full-complement cylindrical roller bearing (dimension series 30 (compact OD, normal width)); a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The radial section height is 25.0 mm and the catalogue mass 2150 g; at 209 kN dynamic rating this is roughly 2.09 kN of C per millimetre of bore before application factors. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "heavy conveyor pulley bearings", "wind turbine rotor-lock and yaw drives", "large gearbox slow-speed stages", "rolling-mill auxiliary shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 2,600 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 150 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 209/310 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF3020-CV?", "a": "SKF NCF 3020 CV is a single-row full-complement cylindrical roller bearing with 100 mm bore, 150 mm OD and 37 mm width per ISO 15. SKF lists C 209 kN, C0 310 kN, Pu 37.5 kN, reference speed 2,000 r/min and limiting speed 2,600 r/min, mass about 2150 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF3020-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF3020-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF3020", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF3020-CV", "SKF NCF 3020 CV" ], "locale_variants": {} }, { "sku": "NCF3022-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 3022 CV", "series": "NCF3000-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 170, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 275, "static_load_kN": 400, "fatigue_load_limit_kN": 48, "max_rpm": 4500, "reference_speed_rpm": 3800, "limiting_speed_rpm": 4500, "weight_g": 3500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 110 mm shaft, SKF lists NCF3022-CV as single-row full-complement cylindrical roller: 170 mm OD, 45 mm wide, Pu 48 kN, the catalogue lists 3,800 r/min thermal reference speed and 4,500 r/min mechanical limiting speed. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. The radial section height is 30.0 mm and the catalogue mass 3500 g; at 275 kN dynamic rating this is roughly 2.50 kN of C per millimetre of bore before application factors. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "rolling-mill auxiliary shafts", "heavy conveyor pulley bearings", "wind turbine rotor-lock and yaw drives", "large gearbox slow-speed stages" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 4,500 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 170 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 170 mm raceway.", "The 275/400 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF3022-CV?", "a": "SKF NCF 3022 CV is a single-row full-complement cylindrical roller bearing with 110 mm bore, 170 mm OD and 45 mm width per ISO 15. SKF lists C 275 kN, C0 400 kN, Pu 48 kN, reference speed 3,800 r/min and limiting speed 4,500 r/min, mass about 3500 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF3022-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF3022-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF3022", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF3022-CV", "SKF NCF 3022 CV" ], "locale_variants": {} }, { "sku": "NCF3024-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 3024 CV", "series": "NCF3000-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 180, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 292, "static_load_kN": 440, "fatigue_load_limit_kN": 52, "max_rpm": 2000, "reference_speed_rpm": 1700, "limiting_speed_rpm": 2000, "weight_g": 3800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 3024 CV denotes a single-row full-complement cylindrical roller bearing on the ISO 15 120×180×46 mm envelope, dimension series 30 (compact OD, normal width), with catalogue mass 3800 g. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 1.51 (440 against 292 kN), and the Pu figure 52 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 1,700 r/min thermal reference speed and 2,000 r/min mechanical limiting speed. Fit practice for NCF3024-CV: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "heavy offshore winch drums", "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 2,000 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 180 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 292/440 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF3024-CV?", "a": "SKF NCF 3024 CV is a single-row full-complement cylindrical roller bearing with 120 mm bore, 180 mm OD and 46 mm width per ISO 15. SKF lists C 292 kN, C0 440 kN, Pu 52 kN, reference speed 1,700 r/min and limiting speed 2,000 r/min, mass about 3800 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF3024-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF3024-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF3024", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF3024-CV", "SKF NCF 3024 CV" ], "locale_variants": {} }, { "sku": "NCF3026-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 3026 CV", "series": "NCF3000-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 200, "B_mm": 52, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 413, "static_load_kN": 620, "fatigue_load_limit_kN": 72, "max_rpm": 1900, "reference_speed_rpm": 1500, "limiting_speed_rpm": 1900, "weight_g": 5800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NCF3026-CV is the 130 mm bore entry in the NCF3000 range: a 130×200×52 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 413 kN / C0 620 kN. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 1.50 (620 against 413 kN), and the Pu figure 72 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 1,500 r/min thermal reference speed and 1,900 r/min mechanical limiting speed. Fit practice for NCF3026-CV: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "mining crusher eccentric shafts", "heavy offshore winch drums", "large rolling-mill and continuous-caster drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 1,900 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 200 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 200 mm raceway.", "The 413/620 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF3026-CV?", "a": "SKF NCF 3026 CV is a single-row full-complement cylindrical roller bearing with 130 mm bore, 200 mm OD and 52 mm width per ISO 15. SKF lists C 413 kN, C0 620 kN, Pu 72 kN, reference speed 1,500 r/min and limiting speed 1,900 r/min, mass about 5800 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF3026-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF3026-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF3026", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF3026-CV", "SKF NCF 3026 CV" ], "locale_variants": {} }, { "sku": "NCF3028-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 3028 CV", "series": "NCF3000-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 210, "B_mm": 53, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 440, "static_load_kN": 680, "fatigue_load_limit_kN": 78, "max_rpm": 1800, "reference_speed_rpm": 1400, "limiting_speed_rpm": 1800, "weight_g": 6100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NCF 3028 CV is a single-row full-complement cylindrical roller bearing sized 140×210×53 mm — a dimension series 30 (compact OD, normal width), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 1.55 (680 against 440 kN), and the Pu figure 78 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 1,400 r/min thermal reference speed and 1,800 r/min mechanical limiting speed. Fit practice for NCF3028-CV: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts", "heavy offshore winch drums" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 1,800 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 210 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 53 mm-wide ring and concentrates load.", "The 440/680 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF3028-CV?", "a": "SKF NCF 3028 CV is a single-row full-complement cylindrical roller bearing with 140 mm bore, 210 mm OD and 53 mm width per ISO 15. SKF lists C 440 kN, C0 680 kN, Pu 78 kN, reference speed 1,400 r/min and limiting speed 1,800 r/min, mass about 6100 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF3028-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF3028-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF3028", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF3028-CV", "SKF NCF 3028 CV" ], "locale_variants": {} }, { "sku": "NCF3030-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 3030 CV", "series": "NCF3000-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 225, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 457, "static_load_kN": 710, "fatigue_load_limit_kN": 80, "max_rpm": 1700, "reference_speed_rpm": 1300, "limiting_speed_rpm": 1700, "weight_g": 7500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NCF3030-CV is the 150 mm bore entry in the NCF3000 range: a 150×225×56 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 457 kN / C0 710 kN. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. With C 457 kN and C0 710 kN, size the bearing on the 150×225 mm ISO 15 envelope and check the 80 kN Pu against the equivalent-load floor; the catalogue lists 1,300 r/min thermal reference speed and 1,700 r/min mechanical limiting speed. Fit practice for NCF3030-CV: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts", "heavy offshore winch drums" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 1,700 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 56 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 457/710 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF3030-CV?", "a": "SKF NCF 3030 CV is a single-row full-complement cylindrical roller bearing with 150 mm bore, 225 mm OD and 56 mm width per ISO 15. SKF lists C 457 kN, C0 710 kN, Pu 80 kN, reference speed 1,300 r/min and limiting speed 1,700 r/min, mass about 7500 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF3030-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF3030-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF3030", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF3030-CV", "SKF NCF 3030 CV" ], "locale_variants": {} }, { "sku": "NCF3032-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 3032 CV", "series": "NCF3000-series", "type": "cylindrical_roller", "d_mm": 160, "D_mm": 240, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 512, "static_load_kN": 800, "fatigue_load_limit_kN": 90, "max_rpm": 1500, "reference_speed_rpm": 1200, "limiting_speed_rpm": 1500, "weight_g": 9100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NCF 3032 CV is a single-row full-complement cylindrical roller bearing sized 160×240×60 mm — a dimension series 30 (compact OD, normal width), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. With C 512 kN and C0 800 kN, size the bearing on the 160×240 mm ISO 15 envelope and check the 90 kN Pu against the equivalent-load floor; the catalogue lists 1,200 r/min thermal reference speed and 1,500 r/min mechanical limiting speed. Fit practice for NCF3032-CV: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "heavy offshore winch drums", "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 1,500 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 60 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 240 mm raceway.", "The 512/800 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF3032-CV?", "a": "SKF NCF 3032 CV is a single-row full-complement cylindrical roller bearing with 160 mm bore, 240 mm OD and 60 mm width per ISO 15. SKF lists C 512 kN, C0 800 kN, Pu 90 kN, reference speed 1,200 r/min and limiting speed 1,500 r/min, mass about 9100 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF3032-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF3032-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF3032", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF3032-CV", "SKF NCF 3032 CV" ], "locale_variants": {} }, { "sku": "NCF3034-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 3034 CV", "series": "NCF3000-series", "type": "cylindrical_roller", "d_mm": 170, "D_mm": 260, "B_mm": 67, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 671, "static_load_kN": 1060, "fatigue_load_limit_kN": 118, "max_rpm": 1400, "reference_speed_rpm": 1100, "limiting_speed_rpm": 1400, "weight_g": 12500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NCF 3034 CV resolves to a 170×260×67 mm single-row full-complement cylindrical roller bearing (dimension series 30 (compact OD, normal width)); a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. The radial section height is 45.0 mm and the catalogue mass 12500 g; at 671 kN dynamic rating this is roughly 3.95 kN of C per millimetre of bore before application factors. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 170 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts", "heavy offshore winch drums" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 1,400 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 67 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 671/1060 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF3034-CV?", "a": "SKF NCF 3034 CV is a single-row full-complement cylindrical roller bearing with 170 mm bore, 260 mm OD and 67 mm width per ISO 15. SKF lists C 671 kN, C0 1060 kN, Pu 118 kN, reference speed 1,100 r/min and limiting speed 1,400 r/min, mass about 12500 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF3034-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF3034-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF3034", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF3034-CV", "SKF NCF 3034 CV" ], "locale_variants": {} }, { "sku": "NCF3036-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 3036 CV", "series": "NCF3000-series", "type": "cylindrical_roller", "d_mm": 180, "D_mm": 280, "B_mm": 74, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 781, "static_load_kN": 1250, "fatigue_load_limit_kN": 134, "max_rpm": 1300, "reference_speed_rpm": 1100, "limiting_speed_rpm": 1300, "weight_g": 16500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 180 mm shaft, SKF lists NCF3036-CV as single-row full-complement cylindrical roller: 280 mm OD, 74 mm wide, Pu 134 kN, the catalogue lists 1,100 r/min thermal reference speed and 1,300 r/min mechanical limiting speed. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The radial section height is 50.0 mm and the catalogue mass 16500 g; at 781 kN dynamic rating this is roughly 4.34 kN of C per millimetre of bore before application factors. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 180 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "heavy offshore winch drums", "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 1,300 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 74 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 280 mm raceway.", "The 781/1250 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF3036-CV?", "a": "SKF NCF 3036 CV is a single-row full-complement cylindrical roller bearing with 180 mm bore, 280 mm OD and 74 mm width per ISO 15. SKF lists C 781 kN, C0 1250 kN, Pu 134 kN, reference speed 1,100 r/min and limiting speed 1,300 r/min, mass about 16500 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF3036-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF3036-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF3036", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF3036-CV", "SKF NCF 3036 CV" ], "locale_variants": {} }, { "sku": "NCF3038-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 3038 CV", "series": "NCF3000-series", "type": "cylindrical_roller", "d_mm": 190, "D_mm": 290, "B_mm": 75, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 792, "static_load_kN": 1290, "fatigue_load_limit_kN": 140, "max_rpm": 1300, "reference_speed_rpm": 1000, "limiting_speed_rpm": 1300, "weight_g": 17000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 3038 CV denotes a single-row full-complement cylindrical roller bearing on the ISO 15 190×290×75 mm envelope, dimension series 30 (compact OD, normal width), with catalogue mass 17000 g. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. The radial section height is 50.0 mm and the catalogue mass 17000 g; at 792 kN dynamic rating this is roughly 4.17 kN of C per millimetre of bore before application factors. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 190 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "mining crusher eccentric shafts", "heavy offshore winch drums", "large rolling-mill and continuous-caster drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 1,300 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 75 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 75 mm-wide ring and concentrates load.", "The 792/1290 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF3038-CV?", "a": "SKF NCF 3038 CV is a single-row full-complement cylindrical roller bearing with 190 mm bore, 290 mm OD and 75 mm width per ISO 15. SKF lists C 792 kN, C0 1290 kN, Pu 140 kN, reference speed 1,000 r/min and limiting speed 1,300 r/min, mass about 17000 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF3038-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF3038-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF3038", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF3038-CV", "SKF NCF 3038 CV" ], "locale_variants": {} }, { "sku": "NCF3040-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 3040 CV", "series": "NCF3000-series", "type": "cylindrical_roller", "d_mm": 200, "D_mm": 310, "B_mm": 82, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 913, "static_load_kN": 1530, "fatigue_load_limit_kN": 160, "max_rpm": 1200, "reference_speed_rpm": 950, "limiting_speed_rpm": 1200, "weight_g": 22500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 200 mm shaft, SKF lists NCF3040-CV as single-row full-complement cylindrical roller: 310 mm OD, 82 mm wide, Pu 160 kN, the catalogue lists 950 r/min thermal reference speed and 1,200 r/min mechanical limiting speed. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 200 mm seat is about 4.57 kN/mm, typical of dimension series 30 (compact OD, normal width); use C0 1530 kN for static checks such as crane hook blocks standing under load. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 200 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "heavy offshore winch drums", "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 1,200 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 310 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 913/1530 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF3040-CV?", "a": "SKF NCF 3040 CV is a single-row full-complement cylindrical roller bearing with 200 mm bore, 310 mm OD and 82 mm width per ISO 15. SKF lists C 913 kN, C0 1530 kN, Pu 160 kN, reference speed 950 r/min and limiting speed 1,200 r/min, mass about 22500 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF3040-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF3040-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF3040", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF3040-CV", "SKF NCF 3040 CV" ], "locale_variants": {} }, { "sku": "NCF3044-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 3044 CV", "series": "NCF3000-series", "type": "cylindrical_roller", "d_mm": 220, "D_mm": 340, "B_mm": 90, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1080, "static_load_kN": 1800, "fatigue_load_limit_kN": 186, "max_rpm": 1100, "reference_speed_rpm": 850, "limiting_speed_rpm": 1100, "weight_g": 29500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NCF 3044 CV resolves to a 220×340×90 mm single-row full-complement cylindrical roller bearing (dimension series 30 (compact OD, normal width)); a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. With C 1080 kN and C0 1800 kN, size the bearing on the 220×340 mm ISO 15 envelope and check the 186 kN Pu against the equivalent-load floor; the catalogue lists 850 r/min thermal reference speed and 1,100 r/min mechanical limiting speed. Fit practice for NCF3044-CV: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "mining crusher eccentric shafts", "heavy offshore winch drums", "large rolling-mill and continuous-caster drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 1,100 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 1080/1800 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF3044-CV?", "a": "SKF NCF 3044 CV is a single-row full-complement cylindrical roller bearing with 220 mm bore, 340 mm OD and 90 mm width per ISO 15. SKF lists C 1080 kN, C0 1800 kN, Pu 186 kN, reference speed 850 r/min and limiting speed 1,100 r/min, mass about 29500 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF3044-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF3044-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF3044", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF3044-CV", "SKF NCF 3044 CV" ], "locale_variants": {} }, { "sku": "NCF3048-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 3048 CV", "series": "NCF3000-series", "type": "cylindrical_roller", "d_mm": 240, "D_mm": 360, "B_mm": 92, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1140, "static_load_kN": 1960, "fatigue_load_limit_kN": 200, "max_rpm": 1000, "reference_speed_rpm": 800, "limiting_speed_rpm": 1000, "weight_g": 32000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 3048 CV denotes a single-row full-complement cylindrical roller bearing on the ISO 15 240×360×92 mm envelope, dimension series 30 (compact OD, normal width), with catalogue mass 32000 g. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. With C 1140 kN and C0 1960 kN, size the bearing on the 240×360 mm ISO 15 envelope and check the 200 kN Pu against the equivalent-load floor; the catalogue lists 800 r/min thermal reference speed and 1,000 r/min mechanical limiting speed. Fit practice for NCF3048-CV: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "heavy offshore winch drums", "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 1,000 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 92 mm-wide ring and concentrates load.", "The 1140/1960 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF3048-CV?", "a": "SKF NCF 3048 CV is a single-row full-complement cylindrical roller bearing with 240 mm bore, 360 mm OD and 92 mm width per ISO 15. SKF lists C 1140 kN, C0 1960 kN, Pu 200 kN, reference speed 800 r/min and limiting speed 1,000 r/min, mass about 32000 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF3048-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF3048-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF3048", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF3048-CV", "SKF NCF 3048 CV" ], "locale_variants": {} }, { "sku": "NCF3052-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 3052 CV", "series": "NCF3000-series", "type": "cylindrical_roller", "d_mm": 260, "D_mm": 400, "B_mm": 104, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1540, "static_load_kN": 2550, "fatigue_load_limit_kN": 250, "max_rpm": 900, "reference_speed_rpm": 700, "limiting_speed_rpm": 900, "weight_g": 46500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 3052 CV denotes a single-row full-complement cylindrical roller bearing on the ISO 15 260×400×104 mm envelope, dimension series 30 (compact OD, normal width), with catalogue mass 46500 g. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 1.66 (2550 against 1540 kN), and the Pu figure 250 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 700 r/min thermal reference speed and 900 r/min mechanical limiting speed. Fit practice for NCF3052-CV: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "heavy offshore winch drums", "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 900 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 104 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 400 mm raceway.", "The 1540/2550 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF3052-CV?", "a": "SKF NCF 3052 CV is a single-row full-complement cylindrical roller bearing with 260 mm bore, 400 mm OD and 104 mm width per ISO 15. SKF lists C 1540 kN, C0 2550 kN, Pu 250 kN, reference speed 700 r/min and limiting speed 900 r/min, mass about 46500 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF3052-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF3052-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF3052", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF3052-CV", "SKF NCF 3052 CV" ], "locale_variants": {} }, { "sku": "NCF3056-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 3056 CV", "series": "NCF3000-series", "type": "cylindrical_roller", "d_mm": 280, "D_mm": 420, "B_mm": 106, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1570, "static_load_kN": 2650, "fatigue_load_limit_kN": 260, "max_rpm": 850, "reference_speed_rpm": 670, "limiting_speed_rpm": 850, "weight_g": 50000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NCF 3056 CV is a single-row full-complement cylindrical roller bearing sized 280×420×106 mm — a dimension series 30 (compact OD, normal width), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Speed planning for NCF3056-CV: the catalogue lists 670 r/min thermal reference speed and 850 r/min mechanical limiting speed. The mass entry 50000 g covers the complete catalogue execution. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 280 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "mining crusher eccentric shafts", "heavy offshore winch drums", "large rolling-mill and continuous-caster drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 850 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 420 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 420 mm raceway.", "The 1570/2650 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF3056-CV?", "a": "SKF NCF 3056 CV is a single-row full-complement cylindrical roller bearing with 280 mm bore, 420 mm OD and 106 mm width per ISO 15. SKF lists C 1570 kN, C0 2650 kN, Pu 260 kN, reference speed 670 r/min and limiting speed 850 r/min, mass about 50000 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF3056-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF3056-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF3056", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF3056-CV", "SKF NCF 3056 CV" ], "locale_variants": {} }, { "sku": "NCF3060-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 3060 CV", "series": "NCF3000-series", "type": "cylindrical_roller", "d_mm": 300, "D_mm": 460, "B_mm": 118, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1900, "static_load_kN": 3250, "fatigue_load_limit_kN": 300, "max_rpm": 750, "reference_speed_rpm": 600, "limiting_speed_rpm": 750, "weight_g": 65500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NCF 3060 CV is a single-row full-complement cylindrical roller bearing sized 300×460×118 mm — a dimension series 30 (compact OD, normal width), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. The radial section height is 80.0 mm and the catalogue mass 65500 g; at 1900 kN dynamic rating this is roughly 6.33 kN of C per millimetre of bore before application factors. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 300 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "mining crusher eccentric shafts", "heavy offshore winch drums", "large rolling-mill and continuous-caster drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 750 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 1900/3250 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF3060-CV?", "a": "SKF NCF 3060 CV is a single-row full-complement cylindrical roller bearing with 300 mm bore, 460 mm OD and 118 mm width per ISO 15. SKF lists C 1900 kN, C0 3250 kN, Pu 300 kN, reference speed 600 r/min and limiting speed 750 r/min, mass about 65500 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF3060-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF3060-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF3060", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF3060-CV", "SKF NCF 3060 CV" ], "locale_variants": {} }, { "sku": "NCF3064-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 3064 CV", "series": "NCF3000-series", "type": "cylindrical_roller", "d_mm": 320, "D_mm": 480, "B_mm": 121, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1980, "static_load_kN": 3450, "fatigue_load_limit_kN": 310, "max_rpm": 700, "reference_speed_rpm": 560, "limiting_speed_rpm": 700, "weight_g": 71000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 320 mm shaft, SKF lists NCF3064-CV as single-row full-complement cylindrical roller: 480 mm OD, 121 mm wide, Pu 310 kN, the catalogue lists 560 r/min thermal reference speed and 700 r/min mechanical limiting speed. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 1.74 (3450 against 1980 kN), and the Pu figure 310 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 560 r/min thermal reference speed and 700 r/min mechanical limiting speed. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "mining crusher eccentric shafts", "heavy offshore winch drums", "large rolling-mill and continuous-caster drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 700 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 1980/3450 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF3064-CV?", "a": "SKF NCF 3064 CV is a single-row full-complement cylindrical roller bearing with 320 mm bore, 480 mm OD and 121 mm width per ISO 15. SKF lists C 1980 kN, C0 3450 kN, Pu 310 kN, reference speed 560 r/min and limiting speed 700 r/min, mass about 71000 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF3064-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF3064-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF3064", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF3064-CV", "SKF NCF 3064 CV" ], "locale_variants": {} }, { "sku": "NCF3068-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 3068 CV", "series": "NCF3000-series", "type": "cylindrical_roller", "d_mm": 340, "D_mm": 520, "B_mm": 133, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 2380, "static_load_kN": 4150, "fatigue_load_limit_kN": 355, "max_rpm": 670, "reference_speed_rpm": 530, "limiting_speed_rpm": 670, "weight_g": 95000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NCF3068-CV is the 340 mm bore entry in the NCF3000 range: a 340×520×133 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 2380 kN / C0 4150 kN. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 1.74 (4150 against 2380 kN), and the Pu figure 355 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 530 r/min thermal reference speed and 670 r/min mechanical limiting speed. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "heavy offshore winch drums", "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 670 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 133 mm-wide ring and concentrates load.", "The 2380/4150 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF3068-CV?", "a": "SKF NCF 3068 CV is a single-row full-complement cylindrical roller bearing with 340 mm bore, 520 mm OD and 133 mm width per ISO 15. SKF lists C 2380 kN, C0 4150 kN, Pu 355 kN, reference speed 530 r/min and limiting speed 670 r/min, mass about 95000 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF3068-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF3068-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF3068", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF3068-CV", "SKF NCF 3068 CV" ], "locale_variants": {} }, { "sku": "NCF3072-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 3072 CV", "series": "NCF3000-series", "type": "cylindrical_roller", "d_mm": 360, "D_mm": 540, "B_mm": 134, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 2420, "static_load_kN": 4300, "fatigue_load_limit_kN": 365, "max_rpm": 630, "reference_speed_rpm": 500, "limiting_speed_rpm": 630, "weight_g": 105000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NCF 3072 CV resolves to a 360×540×134 mm single-row full-complement cylindrical roller bearing (dimension series 30 (compact OD, normal width)); a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. The NCF configuration means a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together; functionally the bearing is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. With C 2420 kN and C0 4300 kN, size the bearing on the 360×540 mm ISO 15 envelope and check the 365 kN Pu against the equivalent-load floor; the catalogue lists 500 r/min thermal reference speed and 630 r/min mechanical limiting speed. Fit practice for NCF3072-CV: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "mining crusher eccentric shafts", "heavy offshore winch drums", "large rolling-mill and continuous-caster drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 630 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 540 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 540 mm raceway.", "The 2420/4300 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF3072-CV?", "a": "SKF NCF 3072 CV is a single-row full-complement cylindrical roller bearing with 360 mm bore, 540 mm OD and 134 mm width per ISO 15. SKF lists C 2420 kN, C0 4300 kN, Pu 365 kN, reference speed 500 r/min and limiting speed 630 r/min, mass about 105000 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF3072-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF3072-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF3072", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF3072-CV", "SKF NCF 3072 CV" ], "locale_variants": {} }, { "sku": "NCF3076-V", "brand": "SKF", "manufacturer_designation": "SKF NCF 3076 V", "series": "NCF3000-series", "type": "cylindrical_roller", "d_mm": 380, "D_mm": 560, "B_mm": 135, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 2700, "static_load_kN": 5100, "fatigue_load_limit_kN": 425, "max_rpm": 600, "reference_speed_rpm": 480, "limiting_speed_rpm": 600, "weight_g": 110000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 380 mm shaft, SKF lists NCF3076-V as single-row full-complement cylindrical roller: 560 mm OD, 135 mm wide, Pu 425 kN, the catalogue lists 480 r/min thermal reference speed and 600 r/min mechanical limiting speed. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The radial section height is 90.0 mm and the catalogue mass 110000 g; at 2700 kN dynamic rating this is roughly 7.11 kN of C per millimetre of bore before application factors. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 380 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts", "heavy offshore winch drums" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 600 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 560 mm raceway.", "The 2700/5100 kN ratings are SKF catalogue 17000 (2018) values for the V execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF3076-V?", "a": "SKF NCF 3076 V is a single-row full-complement cylindrical roller bearing with 380 mm bore, 560 mm OD and 135 mm width per ISO 15. SKF lists C 2700 kN, C0 5100 kN, Pu 425 kN, reference speed 480 r/min and limiting speed 600 r/min, mass about 110000 g." }, { "q": "What does the NCF designation and V suffix mean?", "a": "Suffix V identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF3076-V take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF3076-V compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF3076", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF3076-V", "SKF NCF 3076 V" ], "locale_variants": {} }, { "sku": "NCF3080-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 3080 CV", "series": "NCF3000-series", "type": "cylindrical_roller", "d_mm": 400, "D_mm": 600, "B_mm": 148, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 2970, "static_load_kN": 5500, "fatigue_load_limit_kN": 450, "max_rpm": 560, "reference_speed_rpm": 450, "limiting_speed_rpm": 560, "weight_g": 145000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NCF 3080 CV denotes a single-row full-complement cylindrical roller bearing on the ISO 15 400×600×148 mm envelope, dimension series 30 (compact OD, normal width), with catalogue mass 145000 g. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Speed planning for NCF3080-CV: the catalogue lists 450 r/min thermal reference speed and 560 r/min mechanical limiting speed. The mass entry 145000 g covers the complete catalogue execution. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 400 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts", "heavy offshore winch drums" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 560 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 148 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 2970/5500 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF3080-CV?", "a": "SKF NCF 3080 CV is a single-row full-complement cylindrical roller bearing with 400 mm bore, 600 mm OD and 148 mm width per ISO 15. SKF lists C 2970 kN, C0 5500 kN, Pu 450 kN, reference speed 450 r/min and limiting speed 560 r/min, mass about 145000 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF3080-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF3080-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF3080", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF3080-CV", "SKF NCF 3080 CV" ], "locale_variants": {} }, { "sku": "NCF3084-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 3084 CV", "series": "NCF3000-series", "type": "cylindrical_roller", "d_mm": 420, "D_mm": 620, "B_mm": 150, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 3030, "static_load_kN": 5700, "fatigue_load_limit_kN": 455, "max_rpm": 530, "reference_speed_rpm": 430, "limiting_speed_rpm": 530, "weight_g": 150000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NCF 3084 CV is a single-row full-complement cylindrical roller bearing sized 420×620×150 mm — a dimension series 30 (compact OD, normal width), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. Reading the NCF prefix: a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. This makes the execution one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. With C 3030 kN and C0 5700 kN, size the bearing on the 420×620 mm ISO 15 envelope and check the 455 kN Pu against the equivalent-load floor; the catalogue lists 430 r/min thermal reference speed and 530 r/min mechanical limiting speed. Assembly note: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts", "heavy offshore winch drums" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 530 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 150 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 3030/5700 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF3084-CV?", "a": "SKF NCF 3084 CV is a single-row full-complement cylindrical roller bearing with 420 mm bore, 620 mm OD and 150 mm width per ISO 15. SKF lists C 3030 kN, C0 5700 kN, Pu 455 kN, reference speed 430 r/min and limiting speed 530 r/min, mass about 150000 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF3084-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF3084-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF3084", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF3084-CV", "SKF NCF 3084 CV" ], "locale_variants": {} }, { "sku": "NCF3092-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 3092 CV", "series": "NCF3000-series", "type": "cylindrical_roller", "d_mm": 460, "D_mm": 680, "B_mm": 163, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 3690, "static_load_kN": 6950, "fatigue_load_limit_kN": 540, "max_rpm": 480, "reference_speed_rpm": 380, "limiting_speed_rpm": 480, "weight_g": 195000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NCF3092-CV is the 460 mm bore entry in the NCF3000 range: a 460×680×163 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 3690 kN / C0 6950 kN. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Speed planning for NCF3092-CV: the catalogue lists 380 r/min thermal reference speed and 480 r/min mechanical limiting speed. The mass entry 195000 g covers the complete catalogue execution. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 460 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "heavy offshore winch drums", "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 480 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 163 mm-wide ring and concentrates load.", "The 3690/6950 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF3092-CV?", "a": "SKF NCF 3092 CV is a single-row full-complement cylindrical roller bearing with 460 mm bore, 680 mm OD and 163 mm width per ISO 15. SKF lists C 3690 kN, C0 6950 kN, Pu 540 kN, reference speed 380 r/min and limiting speed 480 r/min, mass about 195000 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF3092-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF3092-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF3092", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF3092-CV", "SKF NCF 3092 CV" ], "locale_variants": {} }, { "sku": "NCF3096-CV", "brand": "SKF", "manufacturer_designation": "SKF NCF 3096 CV", "series": "NCF3000-series", "type": "cylindrical_roller", "d_mm": 480, "D_mm": 700, "B_mm": 165, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 3740, "static_load_kN": 7200, "fatigue_load_limit_kN": 550, "max_rpm": 450, "reference_speed_rpm": 360, "limiting_speed_rpm": 450, "weight_g": 205000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NCF 3096 CV resolves to a 480×700×165 mm single-row full-complement cylindrical roller bearing (dimension series 30 (compact OD, normal width)); a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. Structurally, the NCF design has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together. In arrangement terms it is one-direction locating: the integral outer-ring flange locates the shaft in one direction; the retaining ring side must not be used to guide axial displacement. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Speed planning for NCF3096-CV: the catalogue lists 360 r/min thermal reference speed and 450 r/min mechanical limiting speed. The mass entry 205000 g covers the complete catalogue execution. Mounting: uncaged rollers demand adequate minimum load and gentle acceleration; do not load the retaining ring axially and relubricate generously to prevent roller smearing. A 480 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts", "heavy offshore winch drums" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 450 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 700 mm raceway.", "The 3740/7200 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NCF3096-CV?", "a": "SKF NCF 3096 CV is a single-row full-complement cylindrical roller bearing with 480 mm bore, 700 mm OD and 165 mm width per ISO 15. SKF lists C 3740 kN, C0 7200 kN, Pu 550 kN, reference speed 360 r/min and limiting speed 450 r/min, mass about 205000 g." }, { "q": "What does the NCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable single-row full complement bearing with two integral flanges on the inner ring, one integral flange on the outer ring and a retaining ring opposite that flange holding the assembly together." }, { "q": "Can NCF3096-CV take axial load and locate the shaft?", "a": "In one direction, against the integral outer-ring flange side. The retaining ring holds the bearing together and must not be axially loaded." }, { "q": "How does NCF3096-CV compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NCF3096", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NCF3096-CV", "SKF NCF 3096 CV" ], "locale_variants": {} }, { "sku": "NJ1009-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 1009 ECP", "series": "NJ1000-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 75, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 44.6, "static_load_kN": 52, "fatigue_load_limit_kN": 6.3, "max_rpm": 11000, "reference_speed_rpm": 11000, "limiting_speed_rpm": 11000, "weight_g": 260, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ1009-ECP is the 45 mm bore entry in the NJ1000 range: a 45×75×16 mm single-row caged cylindrical roller bearing with a glass-fibre reinforced polyamide (PA66) window-type cage, rated C 44.6 kN / C0 52 kN. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. Load-per-bore for the 45 mm seat is about 0.99 kN/mm, typical of dimension series 10 (extra-slim OD, normal width); use C0 52 kN for static checks such as crane hook blocks standing under load. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 45 mm seat normally takes a k5 interference with an H7 housing bore when the inner ring rotates.", "applications": [ "conveyor drive-pulley shafts", "medium industrial gearbox shafts", "electric-motor shafts in pumps and fans", "compressor crank and rotor shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1009, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 1009 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 16 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 16 mm-wide ring and concentrates load.", "The 44.6/52 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ1009-ECP?", "a": "SKF NJ 1009 ECP is a single-row caged cylindrical roller bearing with 45 mm bore, 75 mm OD and 16 mm width per ISO 15. SKF lists C 44.6 kN, C0 52 kN, Pu 6.3 kN, reference speed 11,000 r/min and limiting speed 11,000 r/min, mass about 260 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ1009-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ1009-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ1009", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU1009-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 45×75×16 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ1009-ECP", "SKF NJ 1009 ECP" ], "locale_variants": {} }, { "sku": "NJ1011-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 1011 ECP", "series": "NJ1000-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 90, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 57.2, "static_load_kN": 69.5, "fatigue_load_limit_kN": 8.3, "max_rpm": 8500, "reference_speed_rpm": 8500, "limiting_speed_rpm": 8500, "weight_g": 420, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NJ 1011 ECP resolves to a 55×90×18 mm single-row caged cylindrical roller bearing (dimension series 10 (extra-slim OD, normal width)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 1.22 (69.5 against 57.2 kN), and the Pu figure 8.3 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 8,500 r/min thermal reference speed and 8,500 r/min mechanical limiting speed. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.", "applications": [ "medium industrial gearbox shafts", "electric-motor shafts in pumps and fans", "compressor crank and rotor shafts", "machine-tool radial spindle supports" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1011, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 1011 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 18 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 90 mm raceway.", "The 57.2/69.5 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ1011-ECP?", "a": "SKF NJ 1011 ECP is a single-row caged cylindrical roller bearing with 55 mm bore, 90 mm OD and 18 mm width per ISO 15. SKF lists C 57.2 kN, C0 69.5 kN, Pu 8.3 kN, reference speed 8,500 r/min and limiting speed 8,500 r/min, mass about 420 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ1011-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ1011-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ1011", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU1011-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 55×90×18 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ1011-ECP", "SKF NJ 1011 ECP" ], "locale_variants": {} }, { "sku": "NJ1016-ECML", "brand": "SKF", "manufacturer_designation": "SKF NJ 1016 ECML", "series": "NJ1000-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 125, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 99, "static_load_kN": 127, "fatigue_load_limit_kN": 16.3, "max_rpm": 9500, "reference_speed_rpm": 6000, "limiting_speed_rpm": 9500, "weight_g": 1050, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 80 mm shaft, SKF lists NJ1016-ECML as single-row caged cylindrical roller: 125 mm OD, 22 mm wide, Pu 16.3 kN, the catalogue lists 6,000 r/min thermal reference speed and 9,500 r/min mechanical limiting speed. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. The one-piece machined brass cage is reflected in the published speeds and temperature limits. With C 99 kN and C0 127 kN, size the bearing on the 80×125 mm ISO 15 envelope and check the 16.3 kN Pu against the equivalent-load floor; the catalogue lists 6,000 r/min thermal reference speed and 9,500 r/min mechanical limiting speed. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C.", "applications": [ "rolling-mill auxiliary drive shafts", "paper-machine press rolls", "cement-plant conveyor drives", "heavy gearbox and pinion shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1016, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 1016 ECML and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 125 mm raceway.", "The 99/127 kN ratings are SKF catalogue 17000 (2018) values for the ECML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ1016-ECML?", "a": "SKF NJ 1016 ECML is a single-row caged cylindrical roller bearing with 80 mm bore, 125 mm OD and 22 mm width per ISO 15. SKF lists C 99 kN, C0 127 kN, Pu 16.3 kN, reference speed 6,000 r/min and limiting speed 9,500 r/min, mass about 1050 g." }, { "q": "What does the NJ designation and ECML suffix mean?", "a": "The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ1016-ECML take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ1016-ECML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ1016", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU1016", "equiv_brand": "SKF", "level": "partial", "note": "Same ISO 15 envelope 80×125×22 mm, but catalogue C/C0 ratings differ between executions (99/127 vs 64.4/78 kN) and the NU flange/ring configuration differs — envelope match, not a load-rating equivalent." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ1016-ECML", "SKF NJ 1016 ECML" ], "locale_variants": {} }, { "sku": "NJ1017-ML", "brand": "SKF", "manufacturer_designation": "SKF NJ 1017 ML", "series": "NJ1000-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 130, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 68.2, "static_load_kN": 86.5, "fatigue_load_limit_kN": 10.8, "max_rpm": 9000, "reference_speed_rpm": 6000, "limiting_speed_rpm": 9000, "weight_g": 1100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJ 1017 ML denotes a single-row caged cylindrical roller bearing on the ISO 15 85×130×22 mm envelope, dimension series 10 (extra-slim OD, normal width), with catalogue mass 1100 g. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. With C 68.2 kN and C0 86.5 kN, size the bearing on the 85×130 mm ISO 15 envelope and check the 10.8 kN Pu against the equivalent-load floor; the catalogue lists 6,000 r/min thermal reference speed and 9,000 r/min mechanical limiting speed. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C.", "applications": [ "rolling-mill auxiliary drive shafts", "paper-machine press rolls", "cement-plant conveyor drives", "heavy gearbox and pinion shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1017, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 1017 ML and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 130 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 68.2/86.5 kN ratings are SKF catalogue 17000 (2018) values for the ML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ1017-ML?", "a": "SKF NJ 1017 ML is a single-row caged cylindrical roller bearing with 85 mm bore, 130 mm OD and 22 mm width per ISO 15. SKF lists C 68.2 kN, C0 86.5 kN, Pu 10.8 kN, reference speed 6,000 r/min and limiting speed 9,000 r/min, mass about 1100 g." }, { "q": "What does the NJ designation and ML suffix mean?", "a": "The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ1017-ML take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ1017-ML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ1017", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×130×22 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU1017-ML", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 85×130×22 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP1017-ML", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 85×130×22 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ1017-ML", "SKF NJ 1017 ML" ], "locale_variants": {} }, { "sku": "NJ1018-ML", "brand": "SKF", "manufacturer_designation": "SKF NJ 1018 ML", "series": "NJ1000-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 140, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 80.9, "static_load_kN": 104, "fatigue_load_limit_kN": 12.7, "max_rpm": 8500, "reference_speed_rpm": 5600, "limiting_speed_rpm": 8500, "weight_g": 1400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NJ 1018 ML resolves to a 90×140×24 mm single-row caged cylindrical roller bearing (dimension series 10 (extra-slim OD, normal width)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Load-per-bore for the 90 mm seat is about 0.90 kN/mm, typical of dimension series 10 (extra-slim OD, normal width); use C0 104 kN for static checks such as crane hook blocks standing under load. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 90 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "cement-plant conveyor drives", "heavy gearbox and pinion shafts", "large pump and blower rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1018, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 1018 ML and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 140 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 140 mm raceway.", "The 80.9/104 kN ratings are SKF catalogue 17000 (2018) values for the ML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ1018-ML?", "a": "SKF NJ 1018 ML is a single-row caged cylindrical roller bearing with 90 mm bore, 140 mm OD and 24 mm width per ISO 15. SKF lists C 80.9 kN, C0 104 kN, Pu 12.7 kN, reference speed 5,600 r/min and limiting speed 8,500 r/min, mass about 1400 g." }, { "q": "What does the NJ designation and ML suffix mean?", "a": "The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ1018-ML take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ1018-ML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ1018", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×140×24 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU1018-ML", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 90×140×24 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ1018-ML", "SKF NJ 1018 ML" ], "locale_variants": {} }, { "sku": "NJ1026-ML", "brand": "SKF", "manufacturer_designation": "SKF NJ 1026 ML", "series": "NJ1000-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 200, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 165, "static_load_kN": 224, "fatigue_load_limit_kN": 25, "max_rpm": 5600, "reference_speed_rpm": 3800, "limiting_speed_rpm": 5600, "weight_g": 3900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NJ 1026 ML is a single-row caged cylindrical roller bearing sized 130×200×33 mm — a dimension series 10 (extra-slim OD, normal width), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. The one-piece machined brass cage is reflected in the published speeds and temperature limits. The radial section height is 35.0 mm and the catalogue mass 3900 g; at 165 kN dynamic rating this is roughly 1.27 kN of C per millimetre of bore before application factors. Fit practice for NJ1026-ML: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "marine propulsion line shafts", "heavy turbogenerator rotor supports", "mining hoist and winder shafts", "offshore drawworks shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1026, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 1026 ML and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 165/224 kN ratings are SKF catalogue 17000 (2018) values for the ML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ1026-ML?", "a": "SKF NJ 1026 ML is a single-row caged cylindrical roller bearing with 130 mm bore, 200 mm OD and 33 mm width per ISO 15. SKF lists C 165 kN, C0 224 kN, Pu 25 kN, reference speed 3,800 r/min and limiting speed 5,600 r/min, mass about 3900 g." }, { "q": "What does the NJ designation and ML suffix mean?", "a": "The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ1026-ML take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ1026-ML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ1026", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU1026-ML", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 130×200×33 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ1026-ML", "SKF NJ 1026 ML" ], "locale_variants": {} }, { "sku": "NJ1034-ML", "brand": "SKF", "manufacturer_designation": "SKF NJ 1034 ML", "series": "NJ1000-series", "type": "cylindrical_roller", "d_mm": 170, "D_mm": 260, "B_mm": 42, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 275, "static_load_kN": 400, "fatigue_load_limit_kN": 41.5, "max_rpm": 4300, "reference_speed_rpm": 2800, "limiting_speed_rpm": 4300, "weight_g": 8200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 170 mm shaft, SKF lists NJ1034-ML as single-row caged cylindrical roller: 260 mm OD, 42 mm wide, Pu 41.5 kN, the catalogue lists 2,800 r/min thermal reference speed and 4,300 r/min mechanical limiting speed. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. The one-piece machined brass cage is reflected in the published speeds and temperature limits. With C 275 kN and C0 400 kN, size the bearing on the 170×260 mm ISO 15 envelope and check the 41.5 kN Pu against the equivalent-load floor; the catalogue lists 2,800 r/min thermal reference speed and 4,300 r/min mechanical limiting speed. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 170 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "heavy turbogenerator rotor supports", "mining hoist and winder shafts", "offshore drawworks shafts", "large rolling-mill drive trains" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1034, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 1034 ML and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 260 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 42 mm-wide ring and concentrates load.", "The 275/400 kN ratings are SKF catalogue 17000 (2018) values for the ML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ1034-ML?", "a": "SKF NJ 1034 ML is a single-row caged cylindrical roller bearing with 170 mm bore, 260 mm OD and 42 mm width per ISO 15. SKF lists C 275 kN, C0 400 kN, Pu 41.5 kN, reference speed 2,800 r/min and limiting speed 4,300 r/min, mass about 8200 g." }, { "q": "What does the NJ designation and ML suffix mean?", "a": "The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ1034-ML take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ1034-ML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ1034", "equiv_brand": "NTN", "level": "partial", "note": "Same 170×260×42 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU1034-ML", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 170×260×42 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ1034-ML", "SKF NJ 1034 ML" ], "locale_variants": {} }, { "sku": "NJ1036-ML", "brand": "SKF", "manufacturer_designation": "SKF NJ 1036 ML", "series": "NJ1000-series", "type": "cylindrical_roller", "d_mm": 180, "D_mm": 280, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 336, "static_load_kN": 475, "fatigue_load_limit_kN": 51, "max_rpm": 4000, "reference_speed_rpm": 2600, "limiting_speed_rpm": 4000, "weight_g": 10500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJ 1036 ML denotes a single-row caged cylindrical roller bearing on the ISO 15 180×280×46 mm envelope, dimension series 10 (extra-slim OD, normal width), with catalogue mass 10500 g. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ML: the basic (non-E) ML execution with a machined brass cage, standard for the larger and earlier-design sizes. With C 336 kN and C0 475 kN, size the bearing on the 180×280 mm ISO 15 envelope and check the 51 kN Pu against the equivalent-load floor; the catalogue lists 2,600 r/min thermal reference speed and 4,000 r/min mechanical limiting speed. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 180 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "heavy turbogenerator rotor supports", "mining hoist and winder shafts", "offshore drawworks shafts", "large rolling-mill drive trains" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1036, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 1036 ML and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 280 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 336/475 kN ratings are SKF catalogue 17000 (2018) values for the ML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ1036-ML?", "a": "SKF NJ 1036 ML is a single-row caged cylindrical roller bearing with 180 mm bore, 280 mm OD and 46 mm width per ISO 15. SKF lists C 336 kN, C0 475 kN, Pu 51 kN, reference speed 2,600 r/min and limiting speed 4,000 r/min, mass about 10500 g." }, { "q": "What does the NJ designation and ML suffix mean?", "a": "The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ1036-ML take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ1036-ML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ1036", "equiv_brand": "NTN", "level": "partial", "note": "Same 180×280×46 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU1036-ML", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 180×280×46 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ1036-ML", "SKF NJ 1036 ML" ], "locale_variants": {} }, { "sku": "NJ1038-ML", "brand": "SKF", "manufacturer_designation": "SKF NJ 1038 ML", "series": "NJ1000-series", "type": "cylindrical_roller", "d_mm": 190, "D_mm": 290, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 347, "static_load_kN": 500, "fatigue_load_limit_kN": 53, "max_rpm": 3800, "reference_speed_rpm": 2600, "limiting_speed_rpm": 3800, "weight_g": 11000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ1038-ML is the 190 mm bore entry in the NJ1000 range: a 190×290×46 mm single-row caged cylindrical roller bearing with a one-piece machined brass cage, rated C 347 kN / C0 500 kN. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. With C 347 kN and C0 500 kN, size the bearing on the 190×290 mm ISO 15 envelope and check the 53 kN Pu against the equivalent-load floor; the catalogue lists 2,600 r/min thermal reference speed and 3,800 r/min mechanical limiting speed. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 190 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "heavy turbogenerator rotor supports", "mining hoist and winder shafts", "offshore drawworks shafts", "large rolling-mill drive trains" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1038, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 1038 ML and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 290 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 290 mm raceway.", "The 347/500 kN ratings are SKF catalogue 17000 (2018) values for the ML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ1038-ML?", "a": "SKF NJ 1038 ML is a single-row caged cylindrical roller bearing with 190 mm bore, 290 mm OD and 46 mm width per ISO 15. SKF lists C 347 kN, C0 500 kN, Pu 53 kN, reference speed 2,600 r/min and limiting speed 3,800 r/min, mass about 11000 g." }, { "q": "What does the NJ designation and ML suffix mean?", "a": "The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ1038-ML take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ1038-ML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ1038", "equiv_brand": "NTN", "level": "partial", "note": "Same 190×290×46 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU1038-ML", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 190×290×46 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ1038-ML", "SKF NJ 1038 ML" ], "locale_variants": {} }, { "sku": "NJ1044-ML", "brand": "SKF", "manufacturer_designation": "SKF NJ 1044 ML", "series": "NJ1000-series", "type": "cylindrical_roller", "d_mm": 220, "D_mm": 340, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 495, "static_load_kN": 735, "fatigue_load_limit_kN": 73.5, "max_rpm": 3200, "reference_speed_rpm": 2200, "limiting_speed_rpm": 3200, "weight_g": 18500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NJ 1044 ML is a single-row caged cylindrical roller bearing sized 220×340×56 mm — a dimension series 10 (extra-slim OD, normal width), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ML: the basic (non-E) ML execution with a machined brass cage, standard for the larger and earlier-design sizes. Speed planning for NJ1044-ML: the catalogue lists 2,200 r/min thermal reference speed and 3,200 r/min mechanical limiting speed. The mass entry 18500 g covers the complete catalogue execution. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C.", "applications": [ "mining hoist and winder shafts", "offshore drawworks shafts", "large rolling-mill drive trains", "marine propulsion line shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1044, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 1044 ML and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 56 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 56 mm-wide ring and concentrates load.", "The 495/735 kN ratings are SKF catalogue 17000 (2018) values for the ML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ1044-ML?", "a": "SKF NJ 1044 ML is a single-row caged cylindrical roller bearing with 220 mm bore, 340 mm OD and 56 mm width per ISO 15. SKF lists C 495 kN, C0 735 kN, Pu 73.5 kN, reference speed 2,200 r/min and limiting speed 3,200 r/min, mass about 18500 g." }, { "q": "What does the NJ designation and ML suffix mean?", "a": "The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ1044-ML take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ1044-ML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ1044", "equiv_brand": "NTN", "level": "partial", "note": "Same 220×340×56 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU1044-ML", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 220×340×56 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ1044-ML", "SKF NJ 1044 ML" ], "locale_variants": {} }, { "sku": "NJ1052-ML", "brand": "SKF", "manufacturer_designation": "SKF NJ 1052 ML", "series": "NJ1000-series", "type": "cylindrical_roller", "d_mm": 260, "D_mm": 400, "B_mm": 65, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 627, "static_load_kN": 965, "fatigue_load_limit_kN": 96.5, "max_rpm": 2800, "reference_speed_rpm": 1800, "limiting_speed_rpm": 2800, "weight_g": 30000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ1052-ML is the 260 mm bore entry in the NJ1000 range: a 260×400×65 mm single-row caged cylindrical roller bearing with a one-piece machined brass cage, rated C 627 kN / C0 965 kN. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. The one-piece machined brass cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 1.54 (965 against 627 kN), and the Pu figure 96.5 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 1,800 r/min thermal reference speed and 2,800 r/min mechanical limiting speed. Fit practice for NJ1052-ML: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "large rolling-mill drive trains", "marine propulsion line shafts", "heavy turbogenerator rotor supports", "mining hoist and winder shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1052, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 1052 ML and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 627/965 kN ratings are SKF catalogue 17000 (2018) values for the ML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ1052-ML?", "a": "SKF NJ 1052 ML is a single-row caged cylindrical roller bearing with 260 mm bore, 400 mm OD and 65 mm width per ISO 15. SKF lists C 627 kN, C0 965 kN, Pu 96.5 kN, reference speed 1,800 r/min and limiting speed 2,800 r/min, mass about 30000 g." }, { "q": "What does the NJ designation and ML suffix mean?", "a": "The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ1052-ML take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ1052-ML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ1052", "equiv_brand": "NTN", "level": "partial", "note": "Same 260×400×65 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU1052-ML", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 260×400×65 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ1052-ML", "SKF NJ 1052 ML" ], "locale_variants": {} }, { "sku": "NJ1060-MA", "brand": "SKF", "manufacturer_designation": "SKF NJ 1060 MA", "series": "NJ1000-series", "type": "cylindrical_roller", "d_mm": 300, "D_mm": 460, "B_mm": 74, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 858, "static_load_kN": 1370, "fatigue_load_limit_kN": 129, "max_rpm": 2000, "reference_speed_rpm": 1500, "limiting_speed_rpm": 2000, "weight_g": 46000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 300 mm shaft, SKF lists NJ1060-MA as single-row caged cylindrical roller: 460 mm OD, 74 mm wide, Pu 129 kN, the catalogue lists 1,500 r/min thermal reference speed and 2,000 r/min mechanical limiting speed. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. The one-piece machined brass cage is reflected in the published speeds and temperature limits. The radial section height is 80.0 mm and the catalogue mass 46000 g; at 858 kN dynamic rating this is roughly 2.86 kN of C per millimetre of bore before application factors. Fit practice for NJ1060-MA: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "marine propulsion line shafts", "heavy turbogenerator rotor supports", "mining hoist and winder shafts", "offshore drawworks shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1060, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 1060 MA and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 74 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 858/1370 kN ratings are SKF catalogue 17000 (2018) values for the MA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ1060-MA?", "a": "SKF NJ 1060 MA is a single-row caged cylindrical roller bearing with 300 mm bore, 460 mm OD and 74 mm width per ISO 15. SKF lists C 858 kN, C0 1370 kN, Pu 129 kN, reference speed 1,500 r/min and limiting speed 2,000 r/min, mass about 46000 g." }, { "q": "What does the NJ designation and MA suffix mean?", "a": "The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ1060-MA take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ1060-MA compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ1060", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "NU1060-MA", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 300×460×74 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ1060-MA", "SKF NJ 1060 MA" ], "locale_variants": {} }, { "sku": "NJ1064-MA", "brand": "SKF", "manufacturer_designation": "SKF NJ 1064 MA", "series": "NJ1000-series", "type": "cylindrical_roller", "d_mm": 320, "D_mm": 480, "B_mm": 74, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 880, "static_load_kN": 1430, "fatigue_load_limit_kN": 132, "max_rpm": 1400, "reference_speed_rpm": 1400, "limiting_speed_rpm": 1400, "weight_g": 48000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ1064-MA is the 320 mm bore entry in the NJ1000 range: a 320×480×74 mm single-row caged cylindrical roller bearing with a one-piece machined brass cage, rated C 880 kN / C0 1430 kN. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix MA: the basic (non-E) MA execution with a machined brass cage, standard for the larger and earlier-design sizes. Selection arithmetic: C0/C ≈ 1.63 (1430 against 880 kN), and the Pu figure 132 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 1,400 r/min thermal reference speed and 1,400 r/min mechanical limiting speed. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 320 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "large rolling-mill drive trains", "marine propulsion line shafts", "heavy turbogenerator rotor supports", "mining hoist and winder shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1064, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 1064 MA and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 74 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 880/1430 kN ratings are SKF catalogue 17000 (2018) values for the MA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ1064-MA?", "a": "SKF NJ 1064 MA is a single-row caged cylindrical roller bearing with 320 mm bore, 480 mm OD and 74 mm width per ISO 15. SKF lists C 880 kN, C0 1430 kN, Pu 132 kN, reference speed 1,400 r/min and limiting speed 1,400 r/min, mass about 48000 g." }, { "q": "What does the NJ designation and MA suffix mean?", "a": "The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ1064-MA take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ1064-MA compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ1064", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "NU1064-MA", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 320×480×74 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ1064-MA", "SKF NJ 1064 MA" ], "locale_variants": {} }, { "sku": "NJ1076-MA", "brand": "SKF", "manufacturer_designation": "SKF NJ 1076 MA", "series": "NJ1000-series", "type": "cylindrical_roller", "d_mm": 380, "D_mm": 560, "B_mm": 82, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 1140, "static_load_kN": 1930, "fatigue_load_limit_kN": 170, "max_rpm": 1600, "reference_speed_rpm": 1200, "limiting_speed_rpm": 1600, "weight_g": 71000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NJ 1076 MA is a single-row caged cylindrical roller bearing sized 380×560×82 mm — a dimension series 10 (extra-slim OD, normal width), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix MA: the basic (non-E) MA execution with a machined brass cage, standard for the larger and earlier-design sizes. The radial section height is 90.0 mm and the catalogue mass 71000 g; at 1140 kN dynamic rating this is roughly 3.00 kN of C per millimetre of bore before application factors. Fit practice for NJ1076-MA: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "marine propulsion line shafts", "heavy turbogenerator rotor supports", "mining hoist and winder shafts", "offshore drawworks shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1076, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 1076 MA and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 560 mm raceway.", "The 1140/1930 kN ratings are SKF catalogue 17000 (2018) values for the MA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ1076-MA?", "a": "SKF NJ 1076 MA is a single-row caged cylindrical roller bearing with 380 mm bore, 560 mm OD and 82 mm width per ISO 15. SKF lists C 1140 kN, C0 1930 kN, Pu 170 kN, reference speed 1,200 r/min and limiting speed 1,600 r/min, mass about 71000 g." }, { "q": "What does the NJ designation and MA suffix mean?", "a": "The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ1076-MA take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ1076-MA compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ1076", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "NU1076-MA", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 380×560×82 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ1076-MA", "SKF NJ 1076 MA" ], "locale_variants": {} }, { "sku": "NJ1080-MA", "brand": "SKF", "manufacturer_designation": "SKF NJ 1080 MA", "series": "NJ1000-series", "type": "cylindrical_roller", "d_mm": 400, "D_mm": 600, "B_mm": 90, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 1380, "static_load_kN": 2320, "fatigue_load_limit_kN": 196, "max_rpm": 1500, "reference_speed_rpm": 1100, "limiting_speed_rpm": 1500, "weight_g": 93000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NJ 1080 MA is a single-row caged cylindrical roller bearing sized 400×600×90 mm — a dimension series 10 (extra-slim OD, normal width), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. The one-piece machined brass cage is reflected in the published speeds and temperature limits. Load-per-bore for the 400 mm seat is about 3.45 kN/mm, typical of dimension series 10 (extra-slim OD, normal width); use C0 2320 kN for static checks such as crane hook blocks standing under load. Fit practice for NJ1080-MA: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "offshore drawworks shafts", "large rolling-mill drive trains", "marine propulsion line shafts", "heavy turbogenerator rotor supports" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1080, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 1080 MA and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 90 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 1380/2320 kN ratings are SKF catalogue 17000 (2018) values for the MA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ1080-MA?", "a": "SKF NJ 1080 MA is a single-row caged cylindrical roller bearing with 400 mm bore, 600 mm OD and 90 mm width per ISO 15. SKF lists C 1380 kN, C0 2320 kN, Pu 196 kN, reference speed 1,100 r/min and limiting speed 1,500 r/min, mass about 93000 g." }, { "q": "What does the NJ designation and MA suffix mean?", "a": "The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ1080-MA take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ1080-MA compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ1080", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "NU1080-MA", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 400×600×90 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ1080-MA", "SKF NJ 1080 MA" ], "locale_variants": {} }, { "sku": "NJ18-630-ECMA-HB1", "brand": "SKF", "manufacturer_designation": "SKF NJ 18/630 ECMA/HB1", "series": "NJ1800-series", "type": "cylindrical_roller", "d_mm": 630, "D_mm": 780, "B_mm": 69, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 1100, "static_load_kN": 2500, "fatigue_load_limit_kN": 183, "max_rpm": 950, "reference_speed_rpm": 750, "limiting_speed_rpm": 950, "weight_g": 75000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 630 mm shaft, SKF lists NJ18-630-ECMA-HB1 as single-row caged cylindrical roller: 780 mm OD, 69 mm wide, Pu 183 kN, the catalogue lists 750 r/min thermal reference speed and 950 r/min mechanical limiting speed. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The plain designation (no cage suffix) identifies the basic execution supplied with a standard pressed-steel cage. The one-piece machined brass cage is reflected in the published speeds and temperature limits. Speed planning for NJ18-630-ECMA-HB1: the catalogue lists 750 r/min thermal reference speed and 950 r/min mechanical limiting speed. The mass entry 75000 g covers the complete catalogue execution. Fit practice for NJ18-630-ECMA-HB1: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "mining hoist and winder shafts", "offshore drawworks shafts", "large rolling-mill drive trains", "marine propulsion line shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 18 (ultra-slim section for large shafts) envelope is shared with the N/NU/NJ/NUP executions of 18/630, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 18/630 ECMA/HB1 and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 780 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 1100/2500 kN ratings are SKF catalogue 17000 (2018) values for the ECMA/HB1 execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ18-630-ECMA-HB1?", "a": "SKF NJ 18/630 ECMA/HB1 is a single-row caged cylindrical roller bearing with 630 mm bore, 780 mm OD and 69 mm width per ISO 15. SKF lists C 1100 kN, C0 2500 kN, Pu 183 kN, reference speed 750 r/min and limiting speed 950 r/min, mass about 75000 g." }, { "q": "What does the NJ designation and ECMA/HB1 suffix mean?", "a": "The plain designation (no cage suffix) identifies the basic execution supplied with a standard pressed-steel cage. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ18-630-ECMA-HB1 take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ18-630-ECMA-HB1 compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ18", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ18-630-ECMA-HB1", "SKF NJ 18/630 ECMA/HB1" ], "locale_variants": {} }, { "sku": "NJ1876-ECMP", "brand": "SKF", "manufacturer_designation": "SKF NJ 1876 ECMP", "series": "NJ1800-series", "type": "cylindrical_roller", "d_mm": 380, "D_mm": 480, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 561, "static_load_kN": 1120, "fatigue_load_limit_kN": 98, "max_rpm": 2000, "reference_speed_rpm": 1300, "limiting_speed_rpm": 2000, "weight_g": 21000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJ 1876 ECMP denotes a single-row caged cylindrical roller bearing on the ISO 15 380×480×46 mm envelope, dimension series 18 (ultra-slim section for large shafts), with catalogue mass 21000 g. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECMP suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Speed planning for NJ1876-ECMP: the catalogue lists 1,300 r/min thermal reference speed and 2,000 r/min mechanical limiting speed. The mass entry 21000 g covers the complete catalogue execution. Fit practice for NJ1876-ECMP: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "mining hoist and winder shafts", "offshore drawworks shafts", "large rolling-mill drive trains", "marine propulsion line shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 18 (ultra-slim section for large shafts) envelope is shared with the N/NU/NJ/NUP executions of 1876, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 1876 ECMP and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 480 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 46 mm-wide ring and concentrates load.", "The 561/1120 kN ratings are SKF catalogue 17000 (2018) values for the ECMP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ1876-ECMP?", "a": "SKF NJ 1876 ECMP is a single-row caged cylindrical roller bearing with 380 mm bore, 480 mm OD and 46 mm width per ISO 15. SKF lists C 561 kN, C0 1120 kN, Pu 98 kN, reference speed 1,300 r/min and limiting speed 2,000 r/min, mass about 21000 g." }, { "q": "What does the NJ designation and ECMP suffix mean?", "a": "The ECMP suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ1876-ECMP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ1876-ECMP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU1876-ECMP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 380×480×46 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ1876-ECMP", "SKF NJ 1876 ECMP" ], "locale_variants": {} }, { "sku": "NJ1880-MP", "brand": "SKF", "manufacturer_designation": "SKF NJ 1880 MP", "series": "NJ1800-series", "type": "cylindrical_roller", "d_mm": 400, "D_mm": 500, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 572, "static_load_kN": 1180, "fatigue_load_limit_kN": 96.5, "max_rpm": 1900, "reference_speed_rpm": 1300, "limiting_speed_rpm": 1900, "weight_g": 22000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NJ 1880 MP is a single-row caged cylindrical roller bearing sized 400×500×46 mm — a dimension series 18 (ultra-slim section for large shafts), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The MP suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. The one-piece machined brass cage is reflected in the published speeds and temperature limits. The radial section height is 50.0 mm and the catalogue mass 22000 g; at 572 kN dynamic rating this is roughly 1.43 kN of C per millimetre of bore before application factors. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C.", "applications": [ "marine propulsion line shafts", "heavy turbogenerator rotor supports", "mining hoist and winder shafts", "offshore drawworks shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 18 (ultra-slim section for large shafts) envelope is shared with the N/NU/NJ/NUP executions of 1880, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 1880 MP and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 500 mm raceway.", "The 572/1180 kN ratings are SKF catalogue 17000 (2018) values for the MP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ1880-MP?", "a": "SKF NJ 1880 MP is a single-row caged cylindrical roller bearing with 400 mm bore, 500 mm OD and 46 mm width per ISO 15. SKF lists C 572 kN, C0 1180 kN, Pu 96.5 kN, reference speed 1,300 r/min and limiting speed 1,900 r/min, mass about 22000 g." }, { "q": "What does the NJ designation and MP suffix mean?", "a": "The MP suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ1880-MP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ1880-MP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU1880-MP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 400×500×46 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP1880-MP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 400×500×46 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ1880-MP", "SKF NJ 1880 MP" ], "locale_variants": {} }, { "sku": "NJ202-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 202 ECP", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 15, "D_mm": 35, "B_mm": 11, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 12.5, "static_load_kN": 10.2, "fatigue_load_limit_kN": 1.22, "max_rpm": 26000, "reference_speed_rpm": 22000, "limiting_speed_rpm": 26000, "weight_g": 48, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NJ 202 ECP resolves to a 15×35×11 mm single-row caged cylindrical roller bearing (dimension series 2 (light-section ISO 15 envelope)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Load-per-bore for the 15 mm seat is about 0.83 kN/mm, typical of dimension series 2 (light-section ISO 15 envelope); use C0 10.2 kN for static checks such as crane hook blocks standing under load. Fit practice for NJ202-ECP: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "small pump rotor shafts", "small industrial electric-motor shafts", "light gearbox layshafts", "motor-cycle and small-engine transmissions" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 202, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 202 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 35 mm raceway.", "The 12.5/10.2 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ202-ECP?", "a": "SKF NJ 202 ECP is a single-row caged cylindrical roller bearing with 15 mm bore, 35 mm OD and 11 mm width per ISO 15. SKF lists C 12.5 kN, C0 10.2 kN, Pu 1.22 kN, reference speed 22,000 r/min and limiting speed 26,000 r/min, mass about 48 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ202-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ202-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU202-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 15×35×11 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ202-ECP", "SKF NJ 202 ECP" ], "locale_variants": {} }, { "sku": "NJ203-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 203 ECP", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 17, "D_mm": 40, "B_mm": 12, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 20, "static_load_kN": 14.3, "fatigue_load_limit_kN": 1.73, "max_rpm": 22000, "reference_speed_rpm": 20000, "limiting_speed_rpm": 22000, "weight_g": 69, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NJ 203 ECP resolves to a 17×40×12 mm single-row caged cylindrical roller bearing (dimension series 2 (light-section ISO 15 envelope)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 0.72 (14.3 against 20 kN), and the Pu figure 1.73 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 20,000 r/min thermal reference speed and 22,000 r/min mechanical limiting speed. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.", "applications": [ "small industrial electric-motor shafts", "light gearbox layshafts", "motor-cycle and small-engine transmissions", "appliance and fan armature shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 203, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 203 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 40 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 40 mm raceway.", "The 20/14.3 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ203-ECP?", "a": "SKF NJ 203 ECP is a single-row caged cylindrical roller bearing with 17 mm bore, 40 mm OD and 12 mm width per ISO 15. SKF lists C 20 kN, C0 14.3 kN, Pu 1.73 kN, reference speed 20,000 r/min and limiting speed 22,000 r/min, mass about 69 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ203-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ203-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "N203-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 17×40×12 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU203-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 17×40×12 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP203-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 17×40×12 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ203-ECP", "SKF NJ 203 ECP" ], "locale_variants": {} }, { "sku": "NJ204-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 204 ECP", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 20, "D_mm": 47, "B_mm": 14, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 28.5, "static_load_kN": 22, "fatigue_load_limit_kN": 2.75, "max_rpm": 19000, "reference_speed_rpm": 17000, "limiting_speed_rpm": 19000, "weight_g": 110, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ204-ECP is the 20 mm bore entry in the NJ200 range: a 20×47×14 mm single-row caged cylindrical roller bearing with a glass-fibre reinforced polyamide (PA66) window-type cage, rated C 28.5 kN / C0 22 kN. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The radial section height is 13.5 mm and the catalogue mass 110 g; at 28.5 kN dynamic rating this is roughly 1.43 kN of C per millimetre of bore before application factors. Fit practice for NJ204-ECP: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "light gearbox layshafts", "motor-cycle and small-engine transmissions", "appliance and fan armature shafts", "small pump rotor shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 204, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 204 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 14 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 47 mm raceway.", "The 28.5/22 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ204-ECP?", "a": "SKF NJ 204 ECP is a single-row caged cylindrical roller bearing with 20 mm bore, 47 mm OD and 14 mm width per ISO 15. SKF lists C 28.5 kN, C0 22 kN, Pu 2.75 kN, reference speed 17,000 r/min and limiting speed 19,000 r/min, mass about 110 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ204-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ204-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "N204-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 20×47×14 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP204-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 20×47×14 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU204", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 20×47×14 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ204-ECP", "SKF NJ 204 ECP" ], "locale_variants": {} }, { "sku": "NJ205-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 205 ECP", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 25, "D_mm": 52, "B_mm": 15, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 32.5, "static_load_kN": 27, "fatigue_load_limit_kN": 3.35, "max_rpm": 16000, "reference_speed_rpm": 15000, "limiting_speed_rpm": 16000, "weight_g": 140, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ205-ECP is the 25 mm bore entry in the NJ200 range: a 25×52×15 mm single-row caged cylindrical roller bearing with a glass-fibre reinforced polyamide (PA66) window-type cage, rated C 32.5 kN / C0 27 kN. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. With C 32.5 kN and C0 27 kN, size the bearing on the 25×52 mm ISO 15 envelope and check the 3.35 kN Pu against the equivalent-load floor; the catalogue lists 15,000 r/min thermal reference speed and 16,000 r/min mechanical limiting speed. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.", "applications": [ "motor-cycle and small-engine transmissions", "appliance and fan armature shafts", "small pump rotor shafts", "small industrial electric-motor shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 205, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 205 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 52 mm raceway.", "The 32.5/27 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ205-ECP?", "a": "SKF NJ 205 ECP is a single-row caged cylindrical roller bearing with 25 mm bore, 52 mm OD and 15 mm width per ISO 15. SKF lists C 32.5 kN, C0 27 kN, Pu 3.35 kN, reference speed 15,000 r/min and limiting speed 16,000 r/min, mass about 140 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ205-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ205-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "N205-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 25×52×15 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP205-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 25×52×15 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU205", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 25×52×15 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ205-ECP", "SKF NJ 205 ECP" ], "locale_variants": {} }, { "sku": "NJ206-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 206 ECP", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 30, "D_mm": 62, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 44, "static_load_kN": 36.5, "fatigue_load_limit_kN": 4.55, "max_rpm": 14000, "reference_speed_rpm": 13000, "limiting_speed_rpm": 14000, "weight_g": 210, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 30 mm shaft, SKF lists NJ206-ECP as single-row caged cylindrical roller: 62 mm OD, 16 mm wide, Pu 4.55 kN, the catalogue lists 13,000 r/min thermal reference speed and 14,000 r/min mechanical limiting speed. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Speed planning for NJ206-ECP: the catalogue lists 13,000 r/min thermal reference speed and 14,000 r/min mechanical limiting speed. The mass entry 210 g covers the complete catalogue execution. Fit practice for NJ206-ECP: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "machine-tool radial spindle supports", "conveyor drive-pulley shafts", "medium industrial gearbox shafts", "electric-motor shafts in pumps and fans" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 206, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 206 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 62 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 62 mm raceway.", "The 44/36.5 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ206-ECP?", "a": "SKF NJ 206 ECP is a single-row caged cylindrical roller bearing with 30 mm bore, 62 mm OD and 16 mm width per ISO 15. SKF lists C 44 kN, C0 36.5 kN, Pu 4.55 kN, reference speed 13,000 r/min and limiting speed 14,000 r/min, mass about 210 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ206-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ206-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "N206-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 30×62×16 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP206-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 30×62×16 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU206", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 30×62×16 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ206-ECP", "SKF NJ 206 ECP" ], "locale_variants": {} }, { "sku": "NJ207-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 207 ECP", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 35, "D_mm": 72, "B_mm": 17, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 56, "static_load_kN": 48, "fatigue_load_limit_kN": 6.1, "max_rpm": 12000, "reference_speed_rpm": 11000, "limiting_speed_rpm": 12000, "weight_g": 300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NJ 207 ECP is a single-row caged cylindrical roller bearing sized 35×72×17 mm — a dimension series 2 (light-section ISO 15 envelope), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Load-per-bore for the 35 mm seat is about 1.60 kN/mm, typical of dimension series 2 (light-section ISO 15 envelope); use C0 48 kN for static checks such as crane hook blocks standing under load. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 35 mm seat normally takes a k5 interference with an H7 housing bore when the inner ring rotates.", "applications": [ "conveyor drive-pulley shafts", "medium industrial gearbox shafts", "electric-motor shafts in pumps and fans", "compressor crank and rotor shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 207, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 207 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 17 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 72 mm raceway.", "The 56/48 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ207-ECP?", "a": "SKF NJ 207 ECP is a single-row caged cylindrical roller bearing with 35 mm bore, 72 mm OD and 17 mm width per ISO 15. SKF lists C 56 kN, C0 48 kN, Pu 6.1 kN, reference speed 11,000 r/min and limiting speed 12,000 r/min, mass about 300 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ207-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ207-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "N207-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 35×72×17 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP207-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 35×72×17 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU207", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 35×72×17 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ207-ECP", "SKF NJ 207 ECP" ], "locale_variants": {} }, { "sku": "NJ208-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 208 ECP", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 80, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 62, "static_load_kN": 53, "fatigue_load_limit_kN": 6.7, "max_rpm": 11000, "reference_speed_rpm": 9500, "limiting_speed_rpm": 11000, "weight_g": 380, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NJ 208 ECP is a single-row caged cylindrical roller bearing sized 40×80×18 mm — a dimension series 2 (light-section ISO 15 envelope), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The radial section height is 20.0 mm and the catalogue mass 380 g; at 62 kN dynamic rating this is roughly 1.55 kN of C per millimetre of bore before application factors. Fit practice for NJ208-ECP: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "electric-motor shafts in pumps and fans", "compressor crank and rotor shafts", "machine-tool radial spindle supports", "conveyor drive-pulley shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 208, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 208 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 80 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 80 mm raceway.", "The 62/53 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ208-ECP?", "a": "SKF NJ 208 ECP is a single-row caged cylindrical roller bearing with 40 mm bore, 80 mm OD and 18 mm width per ISO 15. SKF lists C 62 kN, C0 53 kN, Pu 6.7 kN, reference speed 9,500 r/min and limiting speed 11,000 r/min, mass about 380 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ208-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ208-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ208", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×80×18 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "N208-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 40×80×18 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP208-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 40×80×18 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU208", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 40×80×18 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ208-ECP", "SKF NJ 208 ECP" ], "locale_variants": {} }, { "sku": "NJ209-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 209 ECP", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 85, "B_mm": 19, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 69.5, "static_load_kN": 64, "fatigue_load_limit_kN": 8.15, "max_rpm": 9500, "reference_speed_rpm": 9000, "limiting_speed_rpm": 9500, "weight_g": 440, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJ 209 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 45×85×19 mm envelope, dimension series 2 (light-section ISO 15 envelope), with catalogue mass 440 g. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. With C 69.5 kN and C0 64 kN, size the bearing on the 45×85 mm ISO 15 envelope and check the 8.15 kN Pu against the equivalent-load floor; the catalogue lists 9,000 r/min thermal reference speed and 9,500 r/min mechanical limiting speed. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 45 mm seat normally takes a k5 interference with an H7 housing bore when the inner ring rotates.", "applications": [ "compressor crank and rotor shafts", "machine-tool radial spindle supports", "conveyor drive-pulley shafts", "medium industrial gearbox shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 209, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 209 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 19 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 85 mm raceway.", "The 69.5/64 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ209-ECP?", "a": "SKF NJ 209 ECP is a single-row caged cylindrical roller bearing with 45 mm bore, 85 mm OD and 19 mm width per ISO 15. SKF lists C 69.5 kN, C0 64 kN, Pu 8.15 kN, reference speed 9,000 r/min and limiting speed 9,500 r/min, mass about 440 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ209-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ209-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ209", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×85×19 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "N209-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 45×85×19 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP209-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 45×85×19 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU209", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 45×85×19 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ209-ECP", "SKF NJ 209 ECP" ], "locale_variants": {} }, { "sku": "NJ210-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 210 ECP", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 90, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 73.5, "static_load_kN": 69.5, "fatigue_load_limit_kN": 8.8, "max_rpm": 9000, "reference_speed_rpm": 8500, "limiting_speed_rpm": 9000, "weight_g": 490, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 50 mm shaft, SKF lists NJ210-ECP as single-row caged cylindrical roller: 90 mm OD, 20 mm wide, Pu 8.8 kN, the catalogue lists 8,500 r/min thermal reference speed and 9,000 r/min mechanical limiting speed. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Speed planning for NJ210-ECP: the catalogue lists 8,500 r/min thermal reference speed and 9,000 r/min mechanical limiting speed. The mass entry 490 g covers the complete catalogue execution. Fit practice for NJ210-ECP: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "machine-tool radial spindle supports", "conveyor drive-pulley shafts", "medium industrial gearbox shafts", "electric-motor shafts in pumps and fans" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 210, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 210 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 90 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 20 mm-wide ring and concentrates load.", "The 73.5/69.5 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ210-ECP?", "a": "SKF NJ 210 ECP is a single-row caged cylindrical roller bearing with 50 mm bore, 90 mm OD and 20 mm width per ISO 15. SKF lists C 73.5 kN, C0 69.5 kN, Pu 8.8 kN, reference speed 8,500 r/min and limiting speed 9,000 r/min, mass about 490 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ210-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ210-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ210", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×90×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "N210-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 50×90×20 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP210-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 50×90×20 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU210", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 50×90×20 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ210-ECP", "SKF NJ 210 ECP" ], "locale_variants": {} }, { "sku": "NJ211-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 211 ECP", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 100, "B_mm": 21, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 96.5, "static_load_kN": 95, "fatigue_load_limit_kN": 12.2, "max_rpm": 8000, "reference_speed_rpm": 7500, "limiting_speed_rpm": 8000, "weight_g": 670, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NJ 211 ECP is a single-row caged cylindrical roller bearing sized 55×100×21 mm — a dimension series 2 (light-section ISO 15 envelope), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. Load-per-bore for the 55 mm seat is about 1.75 kN/mm, typical of dimension series 2 (light-section ISO 15 envelope); use C0 95 kN for static checks such as crane hook blocks standing under load. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 55 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "conveyor drive-pulley shafts", "medium industrial gearbox shafts", "electric-motor shafts in pumps and fans", "compressor crank and rotor shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 211, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 211 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 21 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 21 mm-wide ring and concentrates load.", "The 96.5/95 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ211-ECP?", "a": "SKF NJ 211 ECP is a single-row caged cylindrical roller bearing with 55 mm bore, 100 mm OD and 21 mm width per ISO 15. SKF lists C 96.5 kN, C0 95 kN, Pu 12.2 kN, reference speed 7,500 r/min and limiting speed 8,000 r/min, mass about 670 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ211-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ211-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ211", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×100×21 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "N211-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 55×100×21 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP211-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 55×100×21 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU211", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 55×100×21 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ211-ECP", "SKF NJ 211 ECP" ], "locale_variants": {} }, { "sku": "NJ212-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 212 ECP", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 110, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 108, "static_load_kN": 102, "fatigue_load_limit_kN": 13.4, "max_rpm": 7500, "reference_speed_rpm": 6700, "limiting_speed_rpm": 7500, "weight_g": 820, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NJ 212 ECP is a single-row caged cylindrical roller bearing sized 60×110×22 mm — a dimension series 2 (light-section ISO 15 envelope), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Load-per-bore for the 60 mm seat is about 1.80 kN/mm, typical of dimension series 2 (light-section ISO 15 envelope); use C0 102 kN for static checks such as crane hook blocks standing under load. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 60 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "cement-plant conveyor drives", "heavy gearbox and pinion shafts", "large pump and blower rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 212, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 212 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 108/102 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ212-ECP?", "a": "SKF NJ 212 ECP is a single-row caged cylindrical roller bearing with 60 mm bore, 110 mm OD and 22 mm width per ISO 15. SKF lists C 108 kN, C0 102 kN, Pu 13.4 kN, reference speed 6,700 r/min and limiting speed 7,500 r/min, mass about 820 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ212-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ212-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ212", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×110×22 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "N212-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 60×110×22 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP212-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 60×110×22 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU212", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 60×110×22 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ212-ECP", "SKF NJ 212 ECP" ], "locale_variants": {} }, { "sku": "NJ213-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 213 ECP", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 120, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 122, "static_load_kN": 118, "fatigue_load_limit_kN": 15.6, "max_rpm": 6700, "reference_speed_rpm": 6300, "limiting_speed_rpm": 6700, "weight_g": 1050, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJ 213 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 65×120×23 mm envelope, dimension series 2 (light-section ISO 15 envelope), with catalogue mass 1050 g. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Selection arithmetic: C0/C ≈ 0.97 (118 against 122 kN), and the Pu figure 15.6 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 6,300 r/min thermal reference speed and 6,700 r/min mechanical limiting speed. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.", "applications": [ "heavy gearbox and pinion shafts", "large pump and blower rotors", "rolling-mill auxiliary drive shafts", "paper-machine press rolls" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 213, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 213 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 120 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 122/118 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ213-ECP?", "a": "SKF NJ 213 ECP is a single-row caged cylindrical roller bearing with 65 mm bore, 120 mm OD and 23 mm width per ISO 15. SKF lists C 122 kN, C0 118 kN, Pu 15.6 kN, reference speed 6,300 r/min and limiting speed 6,700 r/min, mass about 1050 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ213-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ213-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ213", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×120×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "N213-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 65×120×23 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP213-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 65×120×23 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU213", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 65×120×23 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ213-ECP", "SKF NJ 213 ECP" ], "locale_variants": {} }, { "sku": "NJ214-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 214 ECP", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 125, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 137, "static_load_kN": 137, "fatigue_load_limit_kN": 18, "max_rpm": 6300, "reference_speed_rpm": 6000, "limiting_speed_rpm": 6300, "weight_g": 1200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJ 214 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 70×125×24 mm envelope, dimension series 2 (light-section ISO 15 envelope), with catalogue mass 1200 g. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The radial section height is 27.5 mm and the catalogue mass 1200 g; at 137 kN dynamic rating this is roughly 1.96 kN of C per millimetre of bore before application factors. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 70 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "large pump and blower rotors", "rolling-mill auxiliary drive shafts", "paper-machine press rolls", "cement-plant conveyor drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 214, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 214 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 24 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 137/137 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ214-ECP?", "a": "SKF NJ 214 ECP is a single-row caged cylindrical roller bearing with 70 mm bore, 125 mm OD and 24 mm width per ISO 15. SKF lists C 137 kN, C0 137 kN, Pu 18 kN, reference speed 6,000 r/min and limiting speed 6,300 r/min, mass about 1200 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ214-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ214-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ214", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×125×24 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "N214-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 70×125×24 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP214-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 70×125×24 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU214", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 70×125×24 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ214-ECP", "SKF NJ 214 ECP" ], "locale_variants": {} }, { "sku": "NJ215-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 215 ECP", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 130, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 150, "static_load_kN": 156, "fatigue_load_limit_kN": 20.4, "max_rpm": 6000, "reference_speed_rpm": 5600, "limiting_speed_rpm": 6000, "weight_g": 1300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NJ 215 ECP resolves to a 75×130×25 mm single-row caged cylindrical roller bearing (dimension series 2 (light-section ISO 15 envelope)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Speed planning for NJ215-ECP: the catalogue lists 5,600 r/min thermal reference speed and 6,000 r/min mechanical limiting speed. The mass entry 1300 g covers the complete catalogue execution. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.", "applications": [ "paper-machine press rolls", "cement-plant conveyor drives", "heavy gearbox and pinion shafts", "large pump and blower rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 215, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 215 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 130 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 150/156 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ215-ECP?", "a": "SKF NJ 215 ECP is a single-row caged cylindrical roller bearing with 75 mm bore, 130 mm OD and 25 mm width per ISO 15. SKF lists C 150 kN, C0 156 kN, Pu 20.4 kN, reference speed 5,600 r/min and limiting speed 6,000 r/min, mass about 1300 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ215-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ215-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ215", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×130×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "N215-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 75×130×25 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP215-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 75×130×25 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU215", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 75×130×25 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ215-ECP", "SKF NJ 215 ECP" ], "locale_variants": {} }, { "sku": "NJ216-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 216 ECP", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 140, "B_mm": 26, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 160, "static_load_kN": 166, "fatigue_load_limit_kN": 21.2, "max_rpm": 5600, "reference_speed_rpm": 5300, "limiting_speed_rpm": 5600, "weight_g": 1550, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ216-ECP is the 80 mm bore entry in the NJ200 range: a 80×140×26 mm single-row caged cylindrical roller bearing with a glass-fibre reinforced polyamide (PA66) window-type cage, rated C 160 kN / C0 166 kN. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. Load-per-bore for the 80 mm seat is about 2.00 kN/mm, typical of dimension series 2 (light-section ISO 15 envelope); use C0 166 kN for static checks such as crane hook blocks standing under load. Fit practice for NJ216-ECP: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "cement-plant conveyor drives", "heavy gearbox and pinion shafts", "large pump and blower rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 216, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 216 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 26 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 160/166 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ216-ECP?", "a": "SKF NJ 216 ECP is a single-row caged cylindrical roller bearing with 80 mm bore, 140 mm OD and 26 mm width per ISO 15. SKF lists C 160 kN, C0 166 kN, Pu 21.2 kN, reference speed 5,300 r/min and limiting speed 5,600 r/min, mass about 1550 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ216-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ216-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ216", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×140×26 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "N216-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 80×140×26 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP216-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 80×140×26 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU216", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 80×140×26 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ216-ECP", "SKF NJ 216 ECP" ], "locale_variants": {} }, { "sku": "NJ217-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 217 ECP", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 150, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 190, "static_load_kN": 200, "fatigue_load_limit_kN": 25, "max_rpm": 5300, "reference_speed_rpm": 4800, "limiting_speed_rpm": 5300, "weight_g": 1900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ217-ECP is the 85 mm bore entry in the NJ200 range: a 85×150×28 mm single-row caged cylindrical roller bearing with a glass-fibre reinforced polyamide (PA66) window-type cage, rated C 190 kN / C0 200 kN. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Selection arithmetic: C0/C ≈ 1.05 (200 against 190 kN), and the Pu figure 25 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 4,800 r/min thermal reference speed and 5,300 r/min mechanical limiting speed. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.", "applications": [ "heavy gearbox and pinion shafts", "large pump and blower rotors", "rolling-mill auxiliary drive shafts", "paper-machine press rolls" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 217, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 217 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 190/200 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ217-ECP?", "a": "SKF NJ 217 ECP is a single-row caged cylindrical roller bearing with 85 mm bore, 150 mm OD and 28 mm width per ISO 15. SKF lists C 190 kN, C0 200 kN, Pu 25 kN, reference speed 4,800 r/min and limiting speed 5,300 r/min, mass about 1900 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ217-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ217-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ217", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×150×28 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "N217-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 85×150×28 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP217-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 85×150×28 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU217", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 85×150×28 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ217-ECP", "SKF NJ 217 ECP" ], "locale_variants": {} }, { "sku": "NJ218-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 218 ECP", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 160, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 208, "static_load_kN": 220, "fatigue_load_limit_kN": 27, "max_rpm": 5000, "reference_speed_rpm": 4500, "limiting_speed_rpm": 5000, "weight_g": 2300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 90 mm shaft, SKF lists NJ218-ECP as single-row caged cylindrical roller: 160 mm OD, 30 mm wide, Pu 27 kN, the catalogue lists 4,500 r/min thermal reference speed and 5,000 r/min mechanical limiting speed. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. The radial section height is 35.0 mm and the catalogue mass 2300 g; at 208 kN dynamic rating this is roughly 2.31 kN of C per millimetre of bore before application factors. Fit practice for NJ218-ECP: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "large pump and blower rotors", "rolling-mill auxiliary drive shafts", "paper-machine press rolls", "cement-plant conveyor drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 218, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 218 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 160 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 208/220 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ218-ECP?", "a": "SKF NJ 218 ECP is a single-row caged cylindrical roller bearing with 90 mm bore, 160 mm OD and 30 mm width per ISO 15. SKF lists C 208 kN, C0 220 kN, Pu 27 kN, reference speed 4,500 r/min and limiting speed 5,000 r/min, mass about 2300 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ218-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ218-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ218", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×160×30 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "N218-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 90×160×30 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP218-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 90×160×30 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU218", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 90×160×30 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ218-ECP", "SKF NJ 218 ECP" ], "locale_variants": {} }, { "sku": "NJ219-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 219 ECP", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 95, "D_mm": 170, "B_mm": 32, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 255, "static_load_kN": 265, "fatigue_load_limit_kN": 32.5, "max_rpm": 4800, "reference_speed_rpm": 4300, "limiting_speed_rpm": 4800, "weight_g": 2900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 95 mm shaft, SKF lists NJ219-ECP as single-row caged cylindrical roller: 170 mm OD, 32 mm wide, Pu 32.5 kN, the catalogue lists 4,300 r/min thermal reference speed and 4,800 r/min mechanical limiting speed. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. With C 255 kN and C0 265 kN, size the bearing on the 95×170 mm ISO 15 envelope and check the 32.5 kN Pu against the equivalent-load floor; the catalogue lists 4,300 r/min thermal reference speed and 4,800 r/min mechanical limiting speed. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.", "applications": [ "rolling-mill auxiliary drive shafts", "paper-machine press rolls", "cement-plant conveyor drives", "heavy gearbox and pinion shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 219, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 219 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 32 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 255/265 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ219-ECP?", "a": "SKF NJ 219 ECP is a single-row caged cylindrical roller bearing with 95 mm bore, 170 mm OD and 32 mm width per ISO 15. SKF lists C 255 kN, C0 265 kN, Pu 32.5 kN, reference speed 4,300 r/min and limiting speed 4,800 r/min, mass about 2900 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ219-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ219-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ219", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×170×32 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "N219-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 95×170×32 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP219-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 95×170×32 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU219", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 95×170×32 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ219-ECP", "SKF NJ 219 ECP" ], "locale_variants": {} }, { "sku": "NJ220-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 220 ECP", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 180, "B_mm": 34, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 285, "static_load_kN": 305, "fatigue_load_limit_kN": 36.5, "max_rpm": 4500, "reference_speed_rpm": 4000, "limiting_speed_rpm": 4500, "weight_g": 3450, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ220-ECP is the 100 mm bore entry in the NJ200 range: a 100×180×34 mm single-row caged cylindrical roller bearing with a glass-fibre reinforced polyamide (PA66) window-type cage, rated C 285 kN / C0 305 kN. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Speed planning for NJ220-ECP: the catalogue lists 4,000 r/min thermal reference speed and 4,500 r/min mechanical limiting speed. The mass entry 3450 g covers the complete catalogue execution. Fit practice for NJ220-ECP: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "paper-machine press rolls", "cement-plant conveyor drives", "heavy gearbox and pinion shafts", "large pump and blower rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 220, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 220 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 180 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 180 mm raceway.", "The 285/305 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ220-ECP?", "a": "SKF NJ 220 ECP is a single-row caged cylindrical roller bearing with 100 mm bore, 180 mm OD and 34 mm width per ISO 15. SKF lists C 285 kN, C0 305 kN, Pu 36.5 kN, reference speed 4,000 r/min and limiting speed 4,500 r/min, mass about 3450 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ220-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ220-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ220", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×180×34 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "N220-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 100×180×34 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP220-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 100×180×34 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU220", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 100×180×34 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ220-ECP", "SKF NJ 220 ECP" ], "locale_variants": {} }, { "sku": "NJ2203-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 2203 ECP", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 17, "D_mm": 40, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 27.5, "static_load_kN": 21.6, "fatigue_load_limit_kN": 2.65, "max_rpm": 22000, "reference_speed_rpm": 20000, "limiting_speed_rpm": 22000, "weight_g": 93, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 17 mm shaft, SKF lists NJ2203-ECP as single-row caged cylindrical roller: 40 mm OD, 16 mm wide, Pu 2.65 kN, the catalogue lists 20,000 r/min thermal reference speed and 22,000 r/min mechanical limiting speed. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The radial section height is 11.5 mm and the catalogue mass 93 g; at 27.5 kN dynamic rating this is roughly 1.62 kN of C per millimetre of bore before application factors. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.", "applications": [ "light gearbox layshafts", "motor-cycle and small-engine transmissions", "appliance and fan armature shafts", "small pump rotor shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2203, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2203 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 40 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 16 mm-wide ring and concentrates load.", "The 27.5/21.6 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2203-ECP?", "a": "SKF NJ 2203 ECP is a single-row caged cylindrical roller bearing with 17 mm bore, 40 mm OD and 16 mm width per ISO 15. SKF lists C 27.5 kN, C0 21.6 kN, Pu 2.65 kN, reference speed 20,000 r/min and limiting speed 22,000 r/min, mass about 93 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2203-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2203-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU2203-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 17×40×16 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP2203-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 17×40×16 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2203-ECP", "SKF NJ 2203 ECP" ], "locale_variants": {} }, { "sku": "NJ2204-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 2204 ECP", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 20, "D_mm": 47, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 34.5, "static_load_kN": 27.5, "fatigue_load_limit_kN": 3.45, "max_rpm": 19000, "reference_speed_rpm": 17000, "limiting_speed_rpm": 19000, "weight_g": 140, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NJ 2204 ECP is a single-row caged cylindrical roller bearing sized 20×47×18 mm — a dimension series 22 (light-section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. With C 34.5 kN and C0 27.5 kN, size the bearing on the 20×47 mm ISO 15 envelope and check the 3.45 kN Pu against the equivalent-load floor; the catalogue lists 17,000 r/min thermal reference speed and 19,000 r/min mechanical limiting speed. Fit practice for NJ2204-ECP: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "motor-cycle and small-engine transmissions", "appliance and fan armature shafts", "small pump rotor shafts", "small industrial electric-motor shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2204, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2204 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 18 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 18 mm-wide ring and concentrates load.", "The 34.5/27.5 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2204-ECP?", "a": "SKF NJ 2204 ECP is a single-row caged cylindrical roller bearing with 20 mm bore, 47 mm OD and 18 mm width per ISO 15. SKF lists C 34.5 kN, C0 27.5 kN, Pu 3.45 kN, reference speed 17,000 r/min and limiting speed 19,000 r/min, mass about 140 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2204-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2204-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU2204-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 20×47×18 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2204-ECP", "SKF NJ 2204 ECP" ], "locale_variants": {} }, { "sku": "NJ2205-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 2205 ECP", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 25, "D_mm": 52, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 39, "static_load_kN": 34, "fatigue_load_limit_kN": 4.25, "max_rpm": 16000, "reference_speed_rpm": 15000, "limiting_speed_rpm": 16000, "weight_g": 170, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJ 2205 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 25×52×18 mm envelope, dimension series 22 (light-section, wide), with catalogue mass 170 g. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. Speed planning for NJ2205-ECP: the catalogue lists 15,000 r/min thermal reference speed and 16,000 r/min mechanical limiting speed. The mass entry 170 g covers the complete catalogue execution. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 25 mm seat normally takes a k5 interference with an H7 housing bore when the inner ring rotates.", "applications": [ "appliance and fan armature shafts", "small pump rotor shafts", "small industrial electric-motor shafts", "light gearbox layshafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2205, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2205 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 18 mm-wide ring and concentrates load.", "The 39/34 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2205-ECP?", "a": "SKF NJ 2205 ECP is a single-row caged cylindrical roller bearing with 25 mm bore, 52 mm OD and 18 mm width per ISO 15. SKF lists C 39 kN, C0 34 kN, Pu 4.25 kN, reference speed 15,000 r/min and limiting speed 16,000 r/min, mass about 170 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2205-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2205-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NUP2205-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 25×52×18 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU2205", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 25×52×18 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2205-ECP", "SKF NJ 2205 ECP" ], "locale_variants": {} }, { "sku": "NJ2206-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 2206 ECP", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 30, "D_mm": 62, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 55, "static_load_kN": 49, "fatigue_load_limit_kN": 6.1, "max_rpm": 14000, "reference_speed_rpm": 13000, "limiting_speed_rpm": 14000, "weight_g": 260, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJ 2206 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 30×62×20 mm envelope, dimension series 22 (light-section, wide), with catalogue mass 260 g. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Load-per-bore for the 30 mm seat is about 1.83 kN/mm, typical of dimension series 22 (light-section, wide); use C0 49 kN for static checks such as crane hook blocks standing under load. Fit practice for NJ2206-ECP: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "conveyor drive-pulley shafts", "medium industrial gearbox shafts", "electric-motor shafts in pumps and fans", "compressor crank and rotor shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2206, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2206 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 62 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 20 mm-wide ring and concentrates load.", "The 55/49 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2206-ECP?", "a": "SKF NJ 2206 ECP is a single-row caged cylindrical roller bearing with 30 mm bore, 62 mm OD and 20 mm width per ISO 15. SKF lists C 55 kN, C0 49 kN, Pu 6.1 kN, reference speed 13,000 r/min and limiting speed 14,000 r/min, mass about 260 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2206-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2206-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NUP2206-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 30×62×20 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU2206", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 30×62×20 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2206-ECP", "SKF NJ 2206 ECP" ], "locale_variants": {} }, { "sku": "NJ2207-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 2207 ECP", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 35, "D_mm": 72, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 69.5, "static_load_kN": 63, "fatigue_load_limit_kN": 8.15, "max_rpm": 12000, "reference_speed_rpm": 11000, "limiting_speed_rpm": 12000, "weight_g": 410, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NJ 2207 ECP resolves to a 35×72×23 mm single-row caged cylindrical roller bearing (dimension series 22 (light-section, wide)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 0.91 (63 against 69.5 kN), and the Pu figure 8.15 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 11,000 r/min thermal reference speed and 12,000 r/min mechanical limiting speed. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 35 mm seat normally takes a k5 interference with an H7 housing bore when the inner ring rotates.", "applications": [ "medium industrial gearbox shafts", "electric-motor shafts in pumps and fans", "compressor crank and rotor shafts", "machine-tool radial spindle supports" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2207, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2207 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 23 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 23 mm-wide ring and concentrates load.", "The 69.5/63 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2207-ECP?", "a": "SKF NJ 2207 ECP is a single-row caged cylindrical roller bearing with 35 mm bore, 72 mm OD and 23 mm width per ISO 15. SKF lists C 69.5 kN, C0 63 kN, Pu 8.15 kN, reference speed 11,000 r/min and limiting speed 12,000 r/min, mass about 410 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2207-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2207-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NUP2207-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 35×72×23 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU2207", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 35×72×23 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2207-ECP", "SKF NJ 2207 ECP" ], "locale_variants": {} }, { "sku": "NJ2208-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 2208 ECP", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 80, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 81.5, "static_load_kN": 75, "fatigue_load_limit_kN": 9.65, "max_rpm": 11000, "reference_speed_rpm": 9500, "limiting_speed_rpm": 11000, "weight_g": 500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NJ 2208 ECP resolves to a 40×80×23 mm single-row caged cylindrical roller bearing (dimension series 22 (light-section, wide)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. With C 81.5 kN and C0 75 kN, size the bearing on the 40×80 mm ISO 15 envelope and check the 9.65 kN Pu against the equivalent-load floor; the catalogue lists 9,500 r/min thermal reference speed and 11,000 r/min mechanical limiting speed. Fit practice for NJ2208-ECP: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "compressor crank and rotor shafts", "machine-tool radial spindle supports", "conveyor drive-pulley shafts", "medium industrial gearbox shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2208, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2208 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 80 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 23 mm-wide ring and concentrates load.", "The 81.5/75 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2208-ECP?", "a": "SKF NJ 2208 ECP is a single-row caged cylindrical roller bearing with 40 mm bore, 80 mm OD and 23 mm width per ISO 15. SKF lists C 81.5 kN, C0 75 kN, Pu 9.65 kN, reference speed 9,500 r/min and limiting speed 11,000 r/min, mass about 500 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2208-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2208-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ2208", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×80×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NUP2208-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 40×80×23 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU2208", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 40×80×23 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2208-ECP", "SKF NJ 2208 ECP" ], "locale_variants": {} }, { "sku": "NJ2209-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 2209 ECP", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 85, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 85, "static_load_kN": 81.5, "fatigue_load_limit_kN": 10.6, "max_rpm": 9500, "reference_speed_rpm": 9000, "limiting_speed_rpm": 9500, "weight_g": 540, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ2209-ECP is the 45 mm bore entry in the NJ2200 range: a 45×85×23 mm single-row caged cylindrical roller bearing with a glass-fibre reinforced polyamide (PA66) window-type cage, rated C 85 kN / C0 81.5 kN. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. Speed planning for NJ2209-ECP: the catalogue lists 9,000 r/min thermal reference speed and 9,500 r/min mechanical limiting speed. The mass entry 540 g covers the complete catalogue execution. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 45 mm seat normally takes a k5 interference with an H7 housing bore when the inner ring rotates.", "applications": [ "machine-tool radial spindle supports", "conveyor drive-pulley shafts", "medium industrial gearbox shafts", "electric-motor shafts in pumps and fans" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2209, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2209 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 23 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 23 mm-wide ring and concentrates load.", "The 85/81.5 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2209-ECP?", "a": "SKF NJ 2209 ECP is a single-row caged cylindrical roller bearing with 45 mm bore, 85 mm OD and 23 mm width per ISO 15. SKF lists C 85 kN, C0 81.5 kN, Pu 10.6 kN, reference speed 9,000 r/min and limiting speed 9,500 r/min, mass about 540 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2209-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2209-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ2209", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×85×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NUP2209-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 45×85×23 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU2209", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 45×85×23 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2209-ECP", "SKF NJ 2209 ECP" ], "locale_variants": {} }, { "sku": "NJ221-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 221 ECP", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 105, "D_mm": 190, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 300, "static_load_kN": 315, "fatigue_load_limit_kN": 36.5, "max_rpm": 4300, "reference_speed_rpm": 3800, "limiting_speed_rpm": 4300, "weight_g": 4000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ221-ECP is the 105 mm bore entry in the NJ200 range: a 105×190×36 mm single-row caged cylindrical roller bearing with a glass-fibre reinforced polyamide (PA66) window-type cage, rated C 300 kN / C0 315 kN. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 1.05 (315 against 300 kN), and the Pu figure 36.5 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 3,800 r/min thermal reference speed and 4,300 r/min mechanical limiting speed. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.", "applications": [ "heavy gearbox and pinion shafts", "large pump and blower rotors", "rolling-mill auxiliary drive shafts", "paper-machine press rolls" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 221, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 221 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 190 mm raceway.", "The 300/315 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ221-ECP?", "a": "SKF NJ 221 ECP is a single-row caged cylindrical roller bearing with 105 mm bore, 190 mm OD and 36 mm width per ISO 15. SKF lists C 300 kN, C0 315 kN, Pu 36.5 kN, reference speed 3,800 r/min and limiting speed 4,300 r/min, mass about 4000 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ221-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ221-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ221", "equiv_brand": "NTN", "level": "partial", "note": "Same 105×190×36 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "N221-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 105×190×36 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU221-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 105×190×36 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP221-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 105×190×36 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ221-ECP", "SKF NJ 221 ECP" ], "locale_variants": {} }, { "sku": "NJ2210-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 2210 ECP", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 90, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 90, "static_load_kN": 88, "fatigue_load_limit_kN": 11.4, "max_rpm": 9000, "reference_speed_rpm": 8500, "limiting_speed_rpm": 9000, "weight_g": 570, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJ 2210 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 50×90×23 mm envelope, dimension series 22 (light-section, wide), with catalogue mass 570 g. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Speed planning for NJ2210-ECP: the catalogue lists 8,500 r/min thermal reference speed and 9,000 r/min mechanical limiting speed. The mass entry 570 g covers the complete catalogue execution. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 50 mm seat normally takes a k5 interference with an H7 housing bore when the inner ring rotates.", "applications": [ "machine-tool radial spindle supports", "conveyor drive-pulley shafts", "medium industrial gearbox shafts", "electric-motor shafts in pumps and fans" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2210, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2210 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 90 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 90 mm raceway.", "The 90/88 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2210-ECP?", "a": "SKF NJ 2210 ECP is a single-row caged cylindrical roller bearing with 50 mm bore, 90 mm OD and 23 mm width per ISO 15. SKF lists C 90 kN, C0 88 kN, Pu 11.4 kN, reference speed 8,500 r/min and limiting speed 9,000 r/min, mass about 570 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2210-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2210-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ2210", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×90×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NUP2210-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 50×90×23 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU2210", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 50×90×23 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2210-ECP", "SKF NJ 2210 ECP" ], "locale_variants": {} }, { "sku": "NJ2211-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 2211 ECP", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 100, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 114, "static_load_kN": 118, "fatigue_load_limit_kN": 15.3, "max_rpm": 8000, "reference_speed_rpm": 7500, "limiting_speed_rpm": 8000, "weight_g": 810, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NJ 2211 ECP resolves to a 55×100×25 mm single-row caged cylindrical roller bearing (dimension series 22 (light-section, wide)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. Load-per-bore for the 55 mm seat is about 2.07 kN/mm, typical of dimension series 22 (light-section, wide); use C0 118 kN for static checks such as crane hook blocks standing under load. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.", "applications": [ "conveyor drive-pulley shafts", "medium industrial gearbox shafts", "electric-motor shafts in pumps and fans", "compressor crank and rotor shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2211, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2211 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 25 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 100 mm raceway.", "The 114/118 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2211-ECP?", "a": "SKF NJ 2211 ECP is a single-row caged cylindrical roller bearing with 55 mm bore, 100 mm OD and 25 mm width per ISO 15. SKF lists C 114 kN, C0 118 kN, Pu 15.3 kN, reference speed 7,500 r/min and limiting speed 8,000 r/min, mass about 810 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2211-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2211-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ2211", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×100×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NUP2211-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 55×100×25 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU2211", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 55×100×25 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2211-ECP", "SKF NJ 2211 ECP" ], "locale_variants": {} }, { "sku": "NJ2212-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 2212 ECP", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 110, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 146, "static_load_kN": 153, "fatigue_load_limit_kN": 20, "max_rpm": 7500, "reference_speed_rpm": 6700, "limiting_speed_rpm": 7500, "weight_g": 1100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NJ 2212 ECP resolves to a 60×110×28 mm single-row caged cylindrical roller bearing (dimension series 22 (light-section, wide)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Selection arithmetic: C0/C ≈ 1.05 (153 against 146 kN), and the Pu figure 20 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 6,700 r/min thermal reference speed and 7,500 r/min mechanical limiting speed. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 60 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "heavy gearbox and pinion shafts", "large pump and blower rotors", "rolling-mill auxiliary drive shafts", "paper-machine press rolls" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2212, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2212 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 110 mm raceway.", "The 146/153 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2212-ECP?", "a": "SKF NJ 2212 ECP is a single-row caged cylindrical roller bearing with 60 mm bore, 110 mm OD and 28 mm width per ISO 15. SKF lists C 146 kN, C0 153 kN, Pu 20 kN, reference speed 6,700 r/min and limiting speed 7,500 r/min, mass about 1100 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2212-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2212-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ2212", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×110×28 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NUP2212-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 60×110×28 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU2212", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 60×110×28 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2212-ECP", "SKF NJ 2212 ECP" ], "locale_variants": {} }, { "sku": "NJ2213-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 2213 ECP", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 120, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 170, "static_load_kN": 180, "fatigue_load_limit_kN": 24, "max_rpm": 6700, "reference_speed_rpm": 6300, "limiting_speed_rpm": 6700, "weight_g": 1450, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ2213-ECP is the 65 mm bore entry in the NJ2200 range: a 65×120×31 mm single-row caged cylindrical roller bearing with a glass-fibre reinforced polyamide (PA66) window-type cage, rated C 170 kN / C0 180 kN. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. The radial section height is 27.5 mm and the catalogue mass 1450 g; at 170 kN dynamic rating this is roughly 2.62 kN of C per millimetre of bore before application factors. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.", "applications": [ "large pump and blower rotors", "rolling-mill auxiliary drive shafts", "paper-machine press rolls", "cement-plant conveyor drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2213, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2213 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 120 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 120 mm raceway.", "The 170/180 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2213-ECP?", "a": "SKF NJ 2213 ECP is a single-row caged cylindrical roller bearing with 65 mm bore, 120 mm OD and 31 mm width per ISO 15. SKF lists C 170 kN, C0 180 kN, Pu 24 kN, reference speed 6,300 r/min and limiting speed 6,700 r/min, mass about 1450 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2213-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2213-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ2213", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×120×31 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU2213-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 65×120×31 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP2213-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 65×120×31 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2213-ECP", "SKF NJ 2213 ECP" ], "locale_variants": {} }, { "sku": "NJ2214-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 2214 ECP", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 125, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 180, "static_load_kN": 193, "fatigue_load_limit_kN": 25.5, "max_rpm": 6300, "reference_speed_rpm": 6000, "limiting_speed_rpm": 6300, "weight_g": 1500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 70 mm shaft, SKF lists NJ2214-ECP as single-row caged cylindrical roller: 125 mm OD, 31 mm wide, Pu 25.5 kN, the catalogue lists 6,000 r/min thermal reference speed and 6,300 r/min mechanical limiting speed. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. With C 180 kN and C0 193 kN, size the bearing on the 70×125 mm ISO 15 envelope and check the 25.5 kN Pu against the equivalent-load floor; the catalogue lists 6,000 r/min thermal reference speed and 6,300 r/min mechanical limiting speed. Fit practice for NJ2214-ECP: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "rolling-mill auxiliary drive shafts", "paper-machine press rolls", "cement-plant conveyor drives", "heavy gearbox and pinion shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2214, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2214 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 31 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 125 mm raceway.", "The 180/193 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2214-ECP?", "a": "SKF NJ 2214 ECP is a single-row caged cylindrical roller bearing with 70 mm bore, 125 mm OD and 31 mm width per ISO 15. SKF lists C 180 kN, C0 193 kN, Pu 25.5 kN, reference speed 6,000 r/min and limiting speed 6,300 r/min, mass about 1500 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2214-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2214-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ2214", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×125×31 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU2214-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 70×125×31 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP2214-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 70×125×31 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2214-ECP", "SKF NJ 2214 ECP" ], "locale_variants": {} }, { "sku": "NJ2215-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 2215 ECP", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 130, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 186, "static_load_kN": 208, "fatigue_load_limit_kN": 27, "max_rpm": 6000, "reference_speed_rpm": 5600, "limiting_speed_rpm": 6000, "weight_g": 1600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 75 mm shaft, SKF lists NJ2215-ECP as single-row caged cylindrical roller: 130 mm OD, 31 mm wide, Pu 27 kN, the catalogue lists 5,600 r/min thermal reference speed and 6,000 r/min mechanical limiting speed. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. Load-per-bore for the 75 mm seat is about 2.48 kN/mm, typical of dimension series 22 (light-section, wide); use C0 208 kN for static checks such as crane hook blocks standing under load. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.", "applications": [ "cement-plant conveyor drives", "heavy gearbox and pinion shafts", "large pump and blower rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2215, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2215 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 130 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 130 mm raceway.", "The 186/208 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2215-ECP?", "a": "SKF NJ 2215 ECP is a single-row caged cylindrical roller bearing with 75 mm bore, 130 mm OD and 31 mm width per ISO 15. SKF lists C 186 kN, C0 208 kN, Pu 27 kN, reference speed 5,600 r/min and limiting speed 6,000 r/min, mass about 1600 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2215-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2215-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ2215", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×130×31 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU2215-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 75×130×31 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP2215-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 75×130×31 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2215-ECP", "SKF NJ 2215 ECP" ], "locale_variants": {} }, { "sku": "NJ2216-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 2216 ECP", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 140, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 212, "static_load_kN": 245, "fatigue_load_limit_kN": 31, "max_rpm": 5600, "reference_speed_rpm": 5300, "limiting_speed_rpm": 5600, "weight_g": 2050, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NJ 2216 ECP is a single-row caged cylindrical roller bearing sized 80×140×33 mm — a dimension series 22 (light-section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Selection arithmetic: C0/C ≈ 1.16 (245 against 212 kN), and the Pu figure 31 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 5,300 r/min thermal reference speed and 5,600 r/min mechanical limiting speed. Fit practice for NJ2216-ECP: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "heavy gearbox and pinion shafts", "large pump and blower rotors", "rolling-mill auxiliary drive shafts", "paper-machine press rolls" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2216, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2216 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 33 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 140 mm raceway.", "The 212/245 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2216-ECP?", "a": "SKF NJ 2216 ECP is a single-row caged cylindrical roller bearing with 80 mm bore, 140 mm OD and 33 mm width per ISO 15. SKF lists C 212 kN, C0 245 kN, Pu 31 kN, reference speed 5,300 r/min and limiting speed 5,600 r/min, mass about 2050 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2216-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2216-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ2216", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×140×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU2216-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 80×140×33 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP2216-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 80×140×33 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2216-ECP", "SKF NJ 2216 ECP" ], "locale_variants": {} }, { "sku": "NJ2217-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 2217 ECP", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 150, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 250, "static_load_kN": 280, "fatigue_load_limit_kN": 34.5, "max_rpm": 5300, "reference_speed_rpm": 4800, "limiting_speed_rpm": 5300, "weight_g": 2550, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NJ 2217 ECP is a single-row caged cylindrical roller bearing sized 85×150×36 mm — a dimension series 22 (light-section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. The radial section height is 32.5 mm and the catalogue mass 2550 g; at 250 kN dynamic rating this is roughly 2.94 kN of C per millimetre of bore before application factors. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.", "applications": [ "large pump and blower rotors", "rolling-mill auxiliary drive shafts", "paper-machine press rolls", "cement-plant conveyor drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2217, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2217 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 150 mm raceway.", "The 250/280 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2217-ECP?", "a": "SKF NJ 2217 ECP is a single-row caged cylindrical roller bearing with 85 mm bore, 150 mm OD and 36 mm width per ISO 15. SKF lists C 250 kN, C0 280 kN, Pu 34.5 kN, reference speed 4,800 r/min and limiting speed 5,300 r/min, mass about 2550 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2217-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2217-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ2217", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×150×36 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU2217-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 85×150×36 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP2217-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 85×150×36 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2217-ECP", "SKF NJ 2217 ECP" ], "locale_variants": {} }, { "sku": "NJ2218-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 2218 ECP", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 160, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 280, "static_load_kN": 315, "fatigue_load_limit_kN": 39, "max_rpm": 5000, "reference_speed_rpm": 4500, "limiting_speed_rpm": 5000, "weight_g": 3250, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJ 2218 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 90×160×40 mm envelope, dimension series 22 (light-section, wide), with catalogue mass 3250 g. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. With C 280 kN and C0 315 kN, size the bearing on the 90×160 mm ISO 15 envelope and check the 39 kN Pu against the equivalent-load floor; the catalogue lists 4,500 r/min thermal reference speed and 5,000 r/min mechanical limiting speed. Fit practice for NJ2218-ECP: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "rolling-mill auxiliary drive shafts", "paper-machine press rolls", "cement-plant conveyor drives", "heavy gearbox and pinion shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2218, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2218 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 160 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 160 mm raceway.", "The 280/315 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2218-ECP?", "a": "SKF NJ 2218 ECP is a single-row caged cylindrical roller bearing with 90 mm bore, 160 mm OD and 40 mm width per ISO 15. SKF lists C 280 kN, C0 315 kN, Pu 39 kN, reference speed 4,500 r/min and limiting speed 5,000 r/min, mass about 3250 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2218-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2218-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ2218", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×160×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU2218-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 90×160×40 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP2218-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 90×160×40 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2218-ECP", "SKF NJ 2218 ECP" ], "locale_variants": {} }, { "sku": "NJ2219-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 2219 ECP", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 95, "D_mm": 170, "B_mm": 43, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 325, "static_load_kN": 375, "fatigue_load_limit_kN": 45.5, "max_rpm": 4800, "reference_speed_rpm": 4300, "limiting_speed_rpm": 4800, "weight_g": 3950, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NJ 2219 ECP resolves to a 95×170×43 mm single-row caged cylindrical roller bearing (dimension series 22 (light-section, wide)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Speed planning for NJ2219-ECP: the catalogue lists 4,300 r/min thermal reference speed and 4,800 r/min mechanical limiting speed. The mass entry 3950 g covers the complete catalogue execution. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 95 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "paper-machine press rolls", "cement-plant conveyor drives", "heavy gearbox and pinion shafts", "large pump and blower rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2219, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2219 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 43 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 170 mm raceway.", "The 325/375 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2219-ECP?", "a": "SKF NJ 2219 ECP is a single-row caged cylindrical roller bearing with 95 mm bore, 170 mm OD and 43 mm width per ISO 15. SKF lists C 325 kN, C0 375 kN, Pu 45.5 kN, reference speed 4,300 r/min and limiting speed 4,800 r/min, mass about 3950 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2219-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2219-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ2219", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×170×43 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU2219-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 95×170×43 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP2219-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 95×170×43 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2219-ECP", "SKF NJ 2219 ECP" ], "locale_variants": {} }, { "sku": "NJ222-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 222 ECP", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 200, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 335, "static_load_kN": 365, "fatigue_load_limit_kN": 42.5, "max_rpm": 4000, "reference_speed_rpm": 3600, "limiting_speed_rpm": 4000, "weight_g": 4800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 110 mm shaft, SKF lists NJ222-ECP as single-row caged cylindrical roller: 200 mm OD, 38 mm wide, Pu 42.5 kN, the catalogue lists 3,600 r/min thermal reference speed and 4,000 r/min mechanical limiting speed. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The radial section height is 45.0 mm and the catalogue mass 4800 g; at 335 kN dynamic rating this is roughly 3.05 kN of C per millimetre of bore before application factors. Fit practice for NJ222-ECP: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "large pump and blower rotors", "rolling-mill auxiliary drive shafts", "paper-machine press rolls", "cement-plant conveyor drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 222, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 222 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 200 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 200 mm raceway.", "The 335/365 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ222-ECP?", "a": "SKF NJ 222 ECP is a single-row caged cylindrical roller bearing with 110 mm bore, 200 mm OD and 38 mm width per ISO 15. SKF lists C 335 kN, C0 365 kN, Pu 42.5 kN, reference speed 3,600 r/min and limiting speed 4,000 r/min, mass about 4800 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ222-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ222-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ222", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×200×38 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "N222-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 110×200×38 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU222-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 110×200×38 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP222-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 110×200×38 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ222-ECP", "SKF NJ 222 ECP" ], "locale_variants": {} }, { "sku": "NJ2220-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 2220 ECP", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 180, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 380, "static_load_kN": 450, "fatigue_load_limit_kN": 54, "max_rpm": 4500, "reference_speed_rpm": 4000, "limiting_speed_rpm": 4500, "weight_g": 4800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NJ 2220 ECP is a single-row caged cylindrical roller bearing sized 100×180×46 mm — a dimension series 22 (light-section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Load-per-bore for the 100 mm seat is about 3.80 kN/mm, typical of dimension series 22 (light-section, wide); use C0 450 kN for static checks such as crane hook blocks standing under load. Fit practice for NJ2220-ECP: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "cement-plant conveyor drives", "heavy gearbox and pinion shafts", "large pump and blower rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2220, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2220 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 180 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 46 mm-wide ring and concentrates load.", "The 380/450 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2220-ECP?", "a": "SKF NJ 2220 ECP is a single-row caged cylindrical roller bearing with 100 mm bore, 180 mm OD and 46 mm width per ISO 15. SKF lists C 380 kN, C0 450 kN, Pu 54 kN, reference speed 4,000 r/min and limiting speed 4,500 r/min, mass about 4800 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2220-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2220-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ2220", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×180×46 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU2220-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 100×180×46 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP2220-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 100×180×46 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2220-ECP", "SKF NJ 2220 ECP" ], "locale_variants": {} }, { "sku": "NJ2222-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 2222 ECP", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 200, "B_mm": 53, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 440, "static_load_kN": 520, "fatigue_load_limit_kN": 61, "max_rpm": 4000, "reference_speed_rpm": 3600, "limiting_speed_rpm": 4000, "weight_g": 6700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJ 2222 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 110×200×53 mm envelope, dimension series 22 (light-section, wide), with catalogue mass 6700 g. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. With C 440 kN and C0 520 kN, size the bearing on the 110×200 mm ISO 15 envelope and check the 61 kN Pu against the equivalent-load floor; the catalogue lists 3,600 r/min thermal reference speed and 4,000 r/min mechanical limiting speed. Fit practice for NJ2222-ECP: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "rolling-mill auxiliary drive shafts", "paper-machine press rolls", "cement-plant conveyor drives", "heavy gearbox and pinion shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2222, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2222 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 200 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 53 mm-wide ring and concentrates load.", "The 440/520 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2222-ECP?", "a": "SKF NJ 2222 ECP is a single-row caged cylindrical roller bearing with 110 mm bore, 200 mm OD and 53 mm width per ISO 15. SKF lists C 440 kN, C0 520 kN, Pu 61 kN, reference speed 3,600 r/min and limiting speed 4,000 r/min, mass about 6700 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2222-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2222-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ2222", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×200×53 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU2222-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 110×200×53 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP2222-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 110×200×53 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2222-ECP", "SKF NJ 2222 ECP" ], "locale_variants": {} }, { "sku": "NJ2224-ECJ", "brand": "SKF", "manufacturer_designation": "SKF NJ 2224 ECJ", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 215, "B_mm": 58, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 520, "static_load_kN": 630, "fatigue_load_limit_kN": 72, "max_rpm": 3600, "reference_speed_rpm": 3400, "limiting_speed_rpm": 3600, "weight_g": 8650, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 120 mm shaft, SKF lists NJ2224-ECJ as single-row caged cylindrical roller: 215 mm OD, 58 mm wide, Pu 72 kN, the catalogue lists 3,400 r/min thermal reference speed and 3,600 r/min mechanical limiting speed. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECJ suffix marks the E-design execution with a pressed sheet-steel window cage, useful where polymer cages are temperature- or lubricant-limited. Load-per-bore for the 120 mm seat is about 4.33 kN/mm, typical of dimension series 22 (light-section, wide); use C0 630 kN for static checks such as crane hook blocks standing under load. Fit practice for NJ2224-ECJ: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "offshore drawworks shafts", "large rolling-mill drive trains", "marine propulsion line shafts", "heavy turbogenerator rotor supports" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2224, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2224 ECJ and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 58 mm-wide ring and concentrates load.", "The 520/630 kN ratings are SKF catalogue 17000 (2018) values for the ECJ execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2224-ECJ?", "a": "SKF NJ 2224 ECJ is a single-row caged cylindrical roller bearing with 120 mm bore, 215 mm OD and 58 mm width per ISO 15. SKF lists C 520 kN, C0 630 kN, Pu 72 kN, reference speed 3,400 r/min and limiting speed 3,600 r/min, mass about 8650 g." }, { "q": "What does the NJ designation and ECJ suffix mean?", "a": "The ECJ suffix marks the E-design execution with a pressed sheet-steel window cage, useful where polymer cages are temperature- or lubricant-limited. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2224-ECJ take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2224-ECJ compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ2224", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×215×58 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU2224-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 120×215×58 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP2224-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 120×215×58 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2224-ECJ", "SKF NJ 2224 ECJ" ], "locale_variants": {} }, { "sku": "NJ2226-ECML", "brand": "SKF", "manufacturer_designation": "SKF NJ 2226 ECML", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 230, "B_mm": 64, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 610, "static_load_kN": 735, "fatigue_load_limit_kN": 83, "max_rpm": 5300, "reference_speed_rpm": 3200, "limiting_speed_rpm": 5300, "weight_g": 12000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 130 mm shaft, SKF lists NJ2226-ECML as single-row caged cylindrical roller: 230 mm OD, 64 mm wide, Pu 83 kN, the catalogue lists 3,200 r/min thermal reference speed and 5,300 r/min mechanical limiting speed. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. With C 610 kN and C0 735 kN, size the bearing on the 130×230 mm ISO 15 envelope and check the 83 kN Pu against the equivalent-load floor; the catalogue lists 3,200 r/min thermal reference speed and 5,300 r/min mechanical limiting speed. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 130 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "heavy turbogenerator rotor supports", "mining hoist and winder shafts", "offshore drawworks shafts", "large rolling-mill drive trains" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2226, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2226 ECML and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 230 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 230 mm raceway.", "The 610/735 kN ratings are SKF catalogue 17000 (2018) values for the ECML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2226-ECML?", "a": "SKF NJ 2226 ECML is a single-row caged cylindrical roller bearing with 130 mm bore, 230 mm OD and 64 mm width per ISO 15. SKF lists C 610 kN, C0 735 kN, Pu 83 kN, reference speed 3,200 r/min and limiting speed 5,300 r/min, mass about 12000 g." }, { "q": "What does the NJ designation and ECML suffix mean?", "a": "The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2226-ECML take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2226-ECML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ2226", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×230×64 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU2226-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 130×230×64 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP2226-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 130×230×64 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2226-ECML", "SKF NJ 2226 ECML" ], "locale_variants": {} }, { "sku": "NJ2228-ECML", "brand": "SKF", "manufacturer_designation": "SKF NJ 2228 ECML", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 250, "B_mm": 68, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 655, "static_load_kN": 830, "fatigue_load_limit_kN": 93, "max_rpm": 4800, "reference_speed_rpm": 2800, "limiting_speed_rpm": 4800, "weight_g": 15500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NJ 2228 ECML resolves to a 140×250×68 mm single-row caged cylindrical roller bearing (dimension series 22 (light-section, wide)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECML: the E-design ECML execution with a one-piece machined brass cage for higher-temperature, higher-speed continuous duty. Load-per-bore for the 140 mm seat is about 4.68 kN/mm, typical of dimension series 22 (light-section, wide); use C0 830 kN for static checks such as crane hook blocks standing under load. Fit practice for NJ2228-ECML: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "offshore drawworks shafts", "large rolling-mill drive trains", "marine propulsion line shafts", "heavy turbogenerator rotor supports" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2228, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2228 ECML and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 68 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 250 mm raceway.", "The 655/830 kN ratings are SKF catalogue 17000 (2018) values for the ECML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2228-ECML?", "a": "SKF NJ 2228 ECML is a single-row caged cylindrical roller bearing with 140 mm bore, 250 mm OD and 68 mm width per ISO 15. SKF lists C 655 kN, C0 830 kN, Pu 93 kN, reference speed 2,800 r/min and limiting speed 4,800 r/min, mass about 15500 g." }, { "q": "What does the NJ designation and ECML suffix mean?", "a": "The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2228-ECML take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2228-ECML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ2228", "equiv_brand": "NTN", "level": "partial", "note": "Same 140×250×68 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU2228-ECML", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 140×250×68 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP2228-ECML", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 140×250×68 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2228-ECML", "SKF NJ 2228 ECML" ], "locale_variants": {} }, { "sku": "NJ2230-ECM", "brand": "SKF", "manufacturer_designation": "SKF NJ 2230 ECM", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 270, "B_mm": 73, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 735, "static_load_kN": 930, "fatigue_load_limit_kN": 100, "max_rpm": 2800, "reference_speed_rpm": 2600, "limiting_speed_rpm": 2800, "weight_g": 19000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NJ 2230 ECM is a single-row caged cylindrical roller bearing sized 150×270×73 mm — a dimension series 22 (light-section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECM: the E-design ECM execution with a one-piece machined brass cage for higher-temperature, higher-speed continuous duty. Selection arithmetic: C0/C ≈ 1.27 (930 against 735 kN), and the Pu figure 100 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 2,600 r/min thermal reference speed and 2,800 r/min mechanical limiting speed. Fit practice for NJ2230-ECM: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "large rolling-mill drive trains", "marine propulsion line shafts", "heavy turbogenerator rotor supports", "mining hoist and winder shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2230, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2230 ECM and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 73 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 270 mm raceway.", "The 735/930 kN ratings are SKF catalogue 17000 (2018) values for the ECM execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2230-ECM?", "a": "SKF NJ 2230 ECM is a single-row caged cylindrical roller bearing with 150 mm bore, 270 mm OD and 73 mm width per ISO 15. SKF lists C 735 kN, C0 930 kN, Pu 100 kN, reference speed 2,600 r/min and limiting speed 2,800 r/min, mass about 19000 g." }, { "q": "What does the NJ designation and ECM suffix mean?", "a": "The ECM suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2230-ECM take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2230-ECM compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ2230", "equiv_brand": "NTN", "level": "partial", "note": "Same 150×270×73 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU2230-ECM", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 150×270×73 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2230-ECM", "SKF NJ 2230 ECM" ], "locale_variants": {} }, { "sku": "NJ2232-ECML", "brand": "SKF", "manufacturer_designation": "SKF NJ 2232 ECML", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 160, "D_mm": 290, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 930, "static_load_kN": 1200, "fatigue_load_limit_kN": 129, "max_rpm": 4000, "reference_speed_rpm": 2400, "limiting_speed_rpm": 4000, "weight_g": 23500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ2232-ECML is the 160 mm bore entry in the NJ2200 range: a 160×290×80 mm single-row caged cylindrical roller bearing with a one-piece machined brass cage, rated C 930 kN / C0 1200 kN. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECML: the E-design ECML execution with a one-piece machined brass cage for higher-temperature, higher-speed continuous duty. Selection arithmetic: C0/C ≈ 1.29 (1200 against 930 kN), and the Pu figure 129 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 2,400 r/min thermal reference speed and 4,000 r/min mechanical limiting speed. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C.", "applications": [ "large rolling-mill drive trains", "marine propulsion line shafts", "heavy turbogenerator rotor supports", "mining hoist and winder shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2232, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2232 ECML and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 80 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 80 mm-wide ring and concentrates load.", "The 930/1200 kN ratings are SKF catalogue 17000 (2018) values for the ECML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2232-ECML?", "a": "SKF NJ 2232 ECML is a single-row caged cylindrical roller bearing with 160 mm bore, 290 mm OD and 80 mm width per ISO 15. SKF lists C 930 kN, C0 1200 kN, Pu 129 kN, reference speed 2,400 r/min and limiting speed 4,000 r/min, mass about 23500 g." }, { "q": "What does the NJ designation and ECML suffix mean?", "a": "The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2232-ECML take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2232-ECML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ2232", "equiv_brand": "NTN", "level": "partial", "note": "Same 160×290×80 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU2232-ECML", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 160×290×80 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2232-ECML", "SKF NJ 2232 ECML" ], "locale_variants": {} }, { "sku": "NJ2234-ECML", "brand": "SKF", "manufacturer_designation": "SKF NJ 2234 ECML", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 170, "D_mm": 310, "B_mm": 86, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 1060, "static_load_kN": 1340, "fatigue_load_limit_kN": 140, "max_rpm": 3800, "reference_speed_rpm": 2200, "limiting_speed_rpm": 3800, "weight_g": 29000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJ 2234 ECML denotes a single-row caged cylindrical roller bearing on the ISO 15 170×310×86 mm envelope, dimension series 22 (light-section, wide), with catalogue mass 29000 g. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. The one-piece machined brass cage is reflected in the published speeds and temperature limits. With C 1060 kN and C0 1340 kN, size the bearing on the 170×310 mm ISO 15 envelope and check the 140 kN Pu against the equivalent-load floor; the catalogue lists 2,200 r/min thermal reference speed and 3,800 r/min mechanical limiting speed. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 170 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "heavy turbogenerator rotor supports", "mining hoist and winder shafts", "offshore drawworks shafts", "large rolling-mill drive trains" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2234, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2234 ECML and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 86 mm-wide ring and concentrates load.", "The 1060/1340 kN ratings are SKF catalogue 17000 (2018) values for the ECML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2234-ECML?", "a": "SKF NJ 2234 ECML is a single-row caged cylindrical roller bearing with 170 mm bore, 310 mm OD and 86 mm width per ISO 15. SKF lists C 1060 kN, C0 1340 kN, Pu 140 kN, reference speed 2,200 r/min and limiting speed 3,800 r/min, mass about 29000 g." }, { "q": "What does the NJ designation and ECML suffix mean?", "a": "The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2234-ECML take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2234-ECML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ2234", "equiv_brand": "NTN", "level": "partial", "note": "Same 170×310×86 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU2234-ECML", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 170×310×86 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2234-ECML", "SKF NJ 2234 ECML" ], "locale_variants": {} }, { "sku": "NJ2236-ECML", "brand": "SKF", "manufacturer_designation": "SKF NJ 2236 ECML", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 180, "D_mm": 320, "B_mm": 86, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 1100, "static_load_kN": 1430, "fatigue_load_limit_kN": 146, "max_rpm": 3600, "reference_speed_rpm": 2200, "limiting_speed_rpm": 3600, "weight_g": 30000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ2236-ECML is the 180 mm bore entry in the NJ2200 range: a 180×320×86 mm single-row caged cylindrical roller bearing with a one-piece machined brass cage, rated C 1100 kN / C0 1430 kN. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. The one-piece machined brass cage is reflected in the published speeds and temperature limits. Load-per-bore for the 180 mm seat is about 6.11 kN/mm, typical of dimension series 22 (light-section, wide); use C0 1430 kN for static checks such as crane hook blocks standing under load. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 180 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "offshore drawworks shafts", "large rolling-mill drive trains", "marine propulsion line shafts", "heavy turbogenerator rotor supports" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2236, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2236 ECML and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 320 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 86 mm-wide ring and concentrates load.", "The 1100/1430 kN ratings are SKF catalogue 17000 (2018) values for the ECML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2236-ECML?", "a": "SKF NJ 2236 ECML is a single-row caged cylindrical roller bearing with 180 mm bore, 320 mm OD and 86 mm width per ISO 15. SKF lists C 1100 kN, C0 1430 kN, Pu 146 kN, reference speed 2,200 r/min and limiting speed 3,600 r/min, mass about 30000 g." }, { "q": "What does the NJ designation and ECML suffix mean?", "a": "The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2236-ECML take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2236-ECML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ2236", "equiv_brand": "NTN", "level": "partial", "note": "Same 180×320×86 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU2236-ECML", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 180×320×86 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2236-ECML", "SKF NJ 2236 ECML" ], "locale_variants": {} }, { "sku": "NJ2238-ECML", "brand": "SKF", "manufacturer_designation": "SKF NJ 2238 ECML", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 190, "D_mm": 340, "B_mm": 92, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 1220, "static_load_kN": 1600, "fatigue_load_limit_kN": 160, "max_rpm": 3400, "reference_speed_rpm": 2000, "limiting_speed_rpm": 3400, "weight_g": 37000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NJ 2238 ECML is a single-row caged cylindrical roller bearing sized 190×340×92 mm — a dimension series 22 (light-section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Selection arithmetic: C0/C ≈ 1.31 (1600 against 1220 kN), and the Pu figure 160 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 2,000 r/min thermal reference speed and 3,400 r/min mechanical limiting speed. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C.", "applications": [ "large rolling-mill drive trains", "marine propulsion line shafts", "heavy turbogenerator rotor supports", "mining hoist and winder shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2238, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2238 ECML and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 92 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 1220/1600 kN ratings are SKF catalogue 17000 (2018) values for the ECML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2238-ECML?", "a": "SKF NJ 2238 ECML is a single-row caged cylindrical roller bearing with 190 mm bore, 340 mm OD and 92 mm width per ISO 15. SKF lists C 1220 kN, C0 1600 kN, Pu 160 kN, reference speed 2,000 r/min and limiting speed 3,400 r/min, mass about 37000 g." }, { "q": "What does the NJ designation and ECML suffix mean?", "a": "The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2238-ECML take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2238-ECML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ2238", "equiv_brand": "NTN", "level": "partial", "note": "Same 190×340×92 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU2238-ECML", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 190×340×92 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2238-ECML", "SKF NJ 2238 ECML" ], "locale_variants": {} }, { "sku": "NJ224-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 224 ECP", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 215, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 390, "static_load_kN": 430, "fatigue_load_limit_kN": 49, "max_rpm": 3600, "reference_speed_rpm": 3400, "limiting_speed_rpm": 3600, "weight_g": 5850, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NJ 224 ECP is a single-row caged cylindrical roller bearing sized 120×215×40 mm — a dimension series 2 (light-section ISO 15 envelope), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Speed planning for NJ224-ECP: the catalogue lists 3,400 r/min thermal reference speed and 3,600 r/min mechanical limiting speed. The mass entry 5850 g covers the complete catalogue execution. Fit practice for NJ224-ECP: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "mining hoist and winder shafts", "offshore drawworks shafts", "large rolling-mill drive trains", "marine propulsion line shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 224, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 224 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 215 mm raceway.", "The 390/430 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ224-ECP?", "a": "SKF NJ 224 ECP is a single-row caged cylindrical roller bearing with 120 mm bore, 215 mm OD and 40 mm width per ISO 15. SKF lists C 390 kN, C0 430 kN, Pu 49 kN, reference speed 3,400 r/min and limiting speed 3,600 r/min, mass about 5850 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ224-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ224-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ224", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×215×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "N224-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 120×215×40 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU224-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 120×215×40 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP224-ECJ", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 120×215×40 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ224-ECP", "SKF NJ 224 ECP" ], "locale_variants": {} }, { "sku": "NJ2240-ECML", "brand": "SKF", "manufacturer_designation": "SKF NJ 2240 ECML", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 200, "D_mm": 360, "B_mm": 98, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 1370, "static_load_kN": 1800, "fatigue_load_limit_kN": 180, "max_rpm": 3200, "reference_speed_rpm": 1900, "limiting_speed_rpm": 3200, "weight_g": 44000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NJ 2240 ECML is a single-row caged cylindrical roller bearing sized 200×360×98 mm — a dimension series 22 (light-section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Selection arithmetic: C0/C ≈ 1.31 (1800 against 1370 kN), and the Pu figure 180 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 1,900 r/min thermal reference speed and 3,200 r/min mechanical limiting speed. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C.", "applications": [ "large rolling-mill drive trains", "marine propulsion line shafts", "heavy turbogenerator rotor supports", "mining hoist and winder shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2240, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2240 ECML and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 360 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 1370/1800 kN ratings are SKF catalogue 17000 (2018) values for the ECML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2240-ECML?", "a": "SKF NJ 2240 ECML is a single-row caged cylindrical roller bearing with 200 mm bore, 360 mm OD and 98 mm width per ISO 15. SKF lists C 1370 kN, C0 1800 kN, Pu 180 kN, reference speed 1,900 r/min and limiting speed 3,200 r/min, mass about 44000 g." }, { "q": "What does the NJ designation and ECML suffix mean?", "a": "The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2240-ECML take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2240-ECML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ2240", "equiv_brand": "NTN", "level": "partial", "note": "Same 200×360×98 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU2240-ECML", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 200×360×98 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2240-ECML", "SKF NJ 2240 ECML" ], "locale_variants": {} }, { "sku": "NJ2244-ECML", "brand": "SKF", "manufacturer_designation": "SKF NJ 2244 ECML", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 220, "D_mm": 400, "B_mm": 108, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 1570, "static_load_kN": 2280, "fatigue_load_limit_kN": 212, "max_rpm": 3000, "reference_speed_rpm": 1600, "limiting_speed_rpm": 3000, "weight_g": 60000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 220 mm shaft, SKF lists NJ2244-ECML as single-row caged cylindrical roller: 400 mm OD, 108 mm wide, Pu 212 kN, the catalogue lists 1,600 r/min thermal reference speed and 3,000 r/min mechanical limiting speed. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Load-per-bore for the 220 mm seat is about 7.14 kN/mm, typical of dimension series 22 (light-section, wide); use C0 2280 kN for static checks such as crane hook blocks standing under load. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C.", "applications": [ "offshore drawworks shafts", "large rolling-mill drive trains", "marine propulsion line shafts", "heavy turbogenerator rotor supports" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2244, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2244 ECML and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 1570/2280 kN ratings are SKF catalogue 17000 (2018) values for the ECML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2244-ECML?", "a": "SKF NJ 2244 ECML is a single-row caged cylindrical roller bearing with 220 mm bore, 400 mm OD and 108 mm width per ISO 15. SKF lists C 1570 kN, C0 2280 kN, Pu 212 kN, reference speed 1,600 r/min and limiting speed 3,000 r/min, mass about 60000 g." }, { "q": "What does the NJ designation and ECML suffix mean?", "a": "The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2244-ECML take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2244-ECML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ2244", "equiv_brand": "NTN", "level": "partial", "note": "Same 220×400×108 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU2244-ECML", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 220×400×108 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2244-ECML", "SKF NJ 2244 ECML" ], "locale_variants": {} }, { "sku": "NJ2248-MA", "brand": "SKF", "manufacturer_designation": "SKF NJ 2248 MA", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 240, "D_mm": 440, "B_mm": 120, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 1450, "static_load_kN": 2360, "fatigue_load_limit_kN": 224, "max_rpm": 2200, "reference_speed_rpm": 1500, "limiting_speed_rpm": 2200, "weight_g": 86000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NJ 2248 MA resolves to a 240×440×120 mm single-row caged cylindrical roller bearing (dimension series 22 (light-section, wide)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. The one-piece machined brass cage is reflected in the published speeds and temperature limits. The radial section height is 100.0 mm and the catalogue mass 86000 g; at 1450 kN dynamic rating this is roughly 6.04 kN of C per millimetre of bore before application factors. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C.", "applications": [ "marine propulsion line shafts", "heavy turbogenerator rotor supports", "mining hoist and winder shafts", "offshore drawworks shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2248, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2248 MA and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 440 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 440 mm raceway.", "The 1450/2360 kN ratings are SKF catalogue 17000 (2018) values for the MA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2248-MA?", "a": "SKF NJ 2248 MA is a single-row caged cylindrical roller bearing with 240 mm bore, 440 mm OD and 120 mm width per ISO 15. SKF lists C 1450 kN, C0 2360 kN, Pu 224 kN, reference speed 1,500 r/min and limiting speed 2,200 r/min, mass about 86000 g." }, { "q": "What does the NJ designation and MA suffix mean?", "a": "The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2248-MA take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2248-MA compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ2248", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "NU2248-MA", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 240×440×120 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2248-MA", "SKF NJ 2248 MA" ], "locale_variants": {} }, { "sku": "NJ2252-MA", "brand": "SKF", "manufacturer_designation": "SKF NJ 2252 MA", "series": "NJ2200-series", "type": "cylindrical_roller", "d_mm": 260, "D_mm": 480, "B_mm": 130, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 1790, "static_load_kN": 3000, "fatigue_load_limit_kN": 265, "max_rpm": 2000, "reference_speed_rpm": 1300, "limiting_speed_rpm": 2000, "weight_g": 112000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJ 2252 MA denotes a single-row caged cylindrical roller bearing on the ISO 15 260×480×130 mm envelope, dimension series 22 (light-section, wide), with catalogue mass 112000 g. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. The one-piece machined brass cage is reflected in the published speeds and temperature limits. Speed planning for NJ2252-MA: the catalogue lists 1,300 r/min thermal reference speed and 2,000 r/min mechanical limiting speed. The mass entry 112000 g covers the complete catalogue execution. Fit practice for NJ2252-MA: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "mining hoist and winder shafts", "offshore drawworks shafts", "large rolling-mill drive trains", "marine propulsion line shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 22 (light-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2252, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2252 MA and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 130 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 1790/3000 kN ratings are SKF catalogue 17000 (2018) values for the MA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2252-MA?", "a": "SKF NJ 2252 MA is a single-row caged cylindrical roller bearing with 260 mm bore, 480 mm OD and 130 mm width per ISO 15. SKF lists C 1790 kN, C0 3000 kN, Pu 265 kN, reference speed 1,300 r/min and limiting speed 2,000 r/min, mass about 112000 g." }, { "q": "What does the NJ designation and MA suffix mean?", "a": "The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2252-MA take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2252-MA compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ2252", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "NU2252-MA", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 260×480×130 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2252-MA", "SKF NJ 2252 MA" ], "locale_variants": {} }, { "sku": "NJ226-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 226 ECP", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 230, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 415, "static_load_kN": 455, "fatigue_load_limit_kN": 51, "max_rpm": 3400, "reference_speed_rpm": 3200, "limiting_speed_rpm": 3400, "weight_g": 6600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJ 226 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 130×230×40 mm envelope, dimension series 2 (light-section ISO 15 envelope), with catalogue mass 6600 g. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Selection arithmetic: C0/C ≈ 1.10 (455 against 415 kN), and the Pu figure 51 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 3,200 r/min thermal reference speed and 3,400 r/min mechanical limiting speed. Fit practice for NJ226-ECP: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "large rolling-mill drive trains", "marine propulsion line shafts", "heavy turbogenerator rotor supports", "mining hoist and winder shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 226, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 226 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 40 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 230 mm raceway.", "The 415/455 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ226-ECP?", "a": "SKF NJ 226 ECP is a single-row caged cylindrical roller bearing with 130 mm bore, 230 mm OD and 40 mm width per ISO 15. SKF lists C 415 kN, C0 455 kN, Pu 51 kN, reference speed 3,200 r/min and limiting speed 3,400 r/min, mass about 6600 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ226-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ226-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ226", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×230×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "N226-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 130×230×40 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU226-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 130×230×40 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP226-ECJ", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 130×230×40 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ226-ECP", "SKF NJ 226 ECP" ], "locale_variants": {} }, { "sku": "NJ228-ECJ", "brand": "SKF", "manufacturer_designation": "SKF NJ 228 ECJ", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 250, "B_mm": 42, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 450, "static_load_kN": 510, "fatigue_load_limit_kN": 57, "max_rpm": 3200, "reference_speed_rpm": 2800, "limiting_speed_rpm": 3200, "weight_g": 8600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 140 mm shaft, SKF lists NJ228-ECJ as single-row caged cylindrical roller: 250 mm OD, 42 mm wide, Pu 57 kN, the catalogue lists 2,800 r/min thermal reference speed and 3,200 r/min mechanical limiting speed. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECJ: the E-design execution with a pressed sheet-steel window cage, for positions where polymer cages are temperature- or lubricant-limited. Speed planning for NJ228-ECJ: the catalogue lists 2,800 r/min thermal reference speed and 3,200 r/min mechanical limiting speed. The mass entry 8600 g covers the complete catalogue execution. Fit practice for NJ228-ECJ: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "mining hoist and winder shafts", "offshore drawworks shafts", "large rolling-mill drive trains", "marine propulsion line shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 228, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 228 ECJ and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 42 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 250 mm raceway.", "The 450/510 kN ratings are SKF catalogue 17000 (2018) values for the ECJ execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ228-ECJ?", "a": "SKF NJ 228 ECJ is a single-row caged cylindrical roller bearing with 140 mm bore, 250 mm OD and 42 mm width per ISO 15. SKF lists C 450 kN, C0 510 kN, Pu 57 kN, reference speed 2,800 r/min and limiting speed 3,200 r/min, mass about 8600 g." }, { "q": "What does the NJ designation and ECJ suffix mean?", "a": "The ECJ suffix marks the E-design execution with a pressed sheet-steel window cage, useful where polymer cages are temperature- or lubricant-limited. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ228-ECJ take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ228-ECJ compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ228", "equiv_brand": "NTN", "level": "partial", "note": "Same 140×250×42 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU228-ECM", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 140×250×42 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP228-ECJ", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 140×250×42 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ228-ECJ", "SKF NJ 228 ECJ" ], "locale_variants": {} }, { "sku": "NJ230-ECM", "brand": "SKF", "manufacturer_designation": "SKF NJ 230 ECM", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 270, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 510, "static_load_kN": 600, "fatigue_load_limit_kN": 64, "max_rpm": 2800, "reference_speed_rpm": 2600, "limiting_speed_rpm": 2800, "weight_g": 12000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NJ 230 ECM resolves to a 150×270×45 mm single-row caged cylindrical roller bearing (dimension series 2 (light-section ISO 15 envelope)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECM: the E-design ECM execution with a one-piece machined brass cage for higher-temperature, higher-speed continuous duty. Load-per-bore for the 150 mm seat is about 3.40 kN/mm, typical of dimension series 2 (light-section ISO 15 envelope); use C0 600 kN for static checks such as crane hook blocks standing under load. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 150 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "offshore drawworks shafts", "large rolling-mill drive trains", "marine propulsion line shafts", "heavy turbogenerator rotor supports" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 230, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 230 ECM and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 45 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 510/600 kN ratings are SKF catalogue 17000 (2018) values for the ECM execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ230-ECM?", "a": "SKF NJ 230 ECM is a single-row caged cylindrical roller bearing with 150 mm bore, 270 mm OD and 45 mm width per ISO 15. SKF lists C 510 kN, C0 600 kN, Pu 64 kN, reference speed 2,600 r/min and limiting speed 2,800 r/min, mass about 12000 g." }, { "q": "What does the NJ designation and ECM suffix mean?", "a": "The ECM suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ230-ECM take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ230-ECM compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ230", "equiv_brand": "NTN", "level": "partial", "note": "Same 150×270×45 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU230-ECM", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 150×270×45 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP230-ECJ", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 150×270×45 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ230-ECM", "SKF NJ 230 ECM" ], "locale_variants": {} }, { "sku": "NJ2304-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 2304 ECP", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 20, "D_mm": 52, "B_mm": 21, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 47.5, "static_load_kN": 38, "fatigue_load_limit_kN": 4.8, "max_rpm": 18000, "reference_speed_rpm": 15000, "limiting_speed_rpm": 18000, "weight_g": 220, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 20 mm shaft, SKF lists NJ2304-ECP as single-row caged cylindrical roller: 52 mm OD, 21 mm wide, Pu 4.8 kN, the catalogue lists 15,000 r/min thermal reference speed and 18,000 r/min mechanical limiting speed. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. Load-per-bore for the 20 mm seat is about 2.38 kN/mm, typical of dimension series 23 (medium-section, wide); use C0 38 kN for static checks such as crane hook blocks standing under load. Fit practice for NJ2304-ECP: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "small pump rotor shafts", "small industrial electric-motor shafts", "light gearbox layshafts", "motor-cycle and small-engine transmissions" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 23 (medium-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2304, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2304 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 21 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 47.5/38 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2304-ECP?", "a": "SKF NJ 2304 ECP is a single-row caged cylindrical roller bearing with 20 mm bore, 52 mm OD and 21 mm width per ISO 15. SKF lists C 47.5 kN, C0 38 kN, Pu 4.8 kN, reference speed 15,000 r/min and limiting speed 18,000 r/min, mass about 220 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2304-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2304-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU2304-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 20×52×21 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP2304-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 20×52×21 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2304-ECP", "SKF NJ 2304 ECP" ], "locale_variants": {} }, { "sku": "NJ2305-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 2305 ECP", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 25, "D_mm": 62, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 64, "static_load_kN": 55, "fatigue_load_limit_kN": 6.95, "max_rpm": 15000, "reference_speed_rpm": 12000, "limiting_speed_rpm": 15000, "weight_g": 350, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 25 mm shaft, SKF lists NJ2305-ECP as single-row caged cylindrical roller: 62 mm OD, 24 mm wide, Pu 6.95 kN, the catalogue lists 12,000 r/min thermal reference speed and 15,000 r/min mechanical limiting speed. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Selection arithmetic: C0/C ≈ 0.86 (55 against 64 kN), and the Pu figure 6.95 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 12,000 r/min thermal reference speed and 15,000 r/min mechanical limiting speed. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.", "applications": [ "small industrial electric-motor shafts", "light gearbox layshafts", "motor-cycle and small-engine transmissions", "appliance and fan armature shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 23 (medium-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2305, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2305 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 64/55 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2305-ECP?", "a": "SKF NJ 2305 ECP is a single-row caged cylindrical roller bearing with 25 mm bore, 62 mm OD and 24 mm width per ISO 15. SKF lists C 64 kN, C0 55 kN, Pu 6.95 kN, reference speed 12,000 r/min and limiting speed 15,000 r/min, mass about 350 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2305-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2305-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NUP2305-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 25×62×24 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU2305", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 25×62×24 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2305-ECP", "SKF NJ 2305 ECP" ], "locale_variants": {} }, { "sku": "NJ2306-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 2306 ECP", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 30, "D_mm": 72, "B_mm": 27, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 83, "static_load_kN": 75, "fatigue_load_limit_kN": 9.65, "max_rpm": 12000, "reference_speed_rpm": 11000, "limiting_speed_rpm": 12000, "weight_g": 540, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NJ 2306 ECP is a single-row caged cylindrical roller bearing sized 30×72×27 mm — a dimension series 23 (medium-section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. The radial section height is 21.0 mm and the catalogue mass 540 g; at 83 kN dynamic rating this is roughly 2.77 kN of C per millimetre of bore before application factors. Fit practice for NJ2306-ECP: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "electric-motor shafts in pumps and fans", "compressor crank and rotor shafts", "machine-tool radial spindle supports", "conveyor drive-pulley shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 23 (medium-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2306, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2306 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 72 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 83/75 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2306-ECP?", "a": "SKF NJ 2306 ECP is a single-row caged cylindrical roller bearing with 30 mm bore, 72 mm OD and 27 mm width per ISO 15. SKF lists C 83 kN, C0 75 kN, Pu 9.65 kN, reference speed 11,000 r/min and limiting speed 12,000 r/min, mass about 540 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2306-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2306-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NUP2306-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 30×72×27 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU2306", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 30×72×27 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2306-ECP", "SKF NJ 2306 ECP" ], "locale_variants": {} }, { "sku": "NJ2307-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 2307 ECP", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 35, "D_mm": 80, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 106, "static_load_kN": 98, "fatigue_load_limit_kN": 12.7, "max_rpm": 11000, "reference_speed_rpm": 9500, "limiting_speed_rpm": 11000, "weight_g": 730, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NJ 2307 ECP is a single-row caged cylindrical roller bearing sized 35×80×31 mm — a dimension series 23 (medium-section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Speed planning for NJ2307-ECP: the catalogue lists 9,500 r/min thermal reference speed and 11,000 r/min mechanical limiting speed. The mass entry 730 g covers the complete catalogue execution. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.", "applications": [ "machine-tool radial spindle supports", "conveyor drive-pulley shafts", "medium industrial gearbox shafts", "electric-motor shafts in pumps and fans" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 23 (medium-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2307, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2307 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 106/98 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2307-ECP?", "a": "SKF NJ 2307 ECP is a single-row caged cylindrical roller bearing with 35 mm bore, 80 mm OD and 31 mm width per ISO 15. SKF lists C 106 kN, C0 98 kN, Pu 12.7 kN, reference speed 9,500 r/min and limiting speed 11,000 r/min, mass about 730 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2307-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2307-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NUP2307-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 35×80×31 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU2307", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 35×80×31 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2307-ECP", "SKF NJ 2307 ECP" ], "locale_variants": {} }, { "sku": "NJ2308-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 2308 ECP", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 90, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 129, "static_load_kN": 120, "fatigue_load_limit_kN": 15.3, "max_rpm": 9500, "reference_speed_rpm": 8000, "limiting_speed_rpm": 9500, "weight_g": 950, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJ 2308 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 40×90×33 mm envelope, dimension series 23 (medium-section, wide), with catalogue mass 950 g. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Speed planning for NJ2308-ECP: the catalogue lists 8,000 r/min thermal reference speed and 9,500 r/min mechanical limiting speed. The mass entry 950 g covers the complete catalogue execution. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 40 mm seat normally takes a k5 interference with an H7 housing bore when the inner ring rotates.", "applications": [ "machine-tool radial spindle supports", "conveyor drive-pulley shafts", "medium industrial gearbox shafts", "electric-motor shafts in pumps and fans" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 23 (medium-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2308, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2308 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 90 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 90 mm raceway.", "The 129/120 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2308-ECP?", "a": "SKF NJ 2308 ECP is a single-row caged cylindrical roller bearing with 40 mm bore, 90 mm OD and 33 mm width per ISO 15. SKF lists C 129 kN, C0 120 kN, Pu 15.3 kN, reference speed 8,000 r/min and limiting speed 9,500 r/min, mass about 950 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2308-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2308-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ2308", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×90×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NUP2308-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 40×90×33 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU2308", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 40×90×33 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2308-ECP", "SKF NJ 2308 ECP" ], "locale_variants": {} }, { "sku": "NJ2309-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 2309 ECP", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 100, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 160, "static_load_kN": 153, "fatigue_load_limit_kN": 20, "max_rpm": 8500, "reference_speed_rpm": 7500, "limiting_speed_rpm": 8500, "weight_g": 1350, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NJ 2309 ECP resolves to a 45×100×36 mm single-row caged cylindrical roller bearing (dimension series 23 (medium-section, wide)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. Load-per-bore for the 45 mm seat is about 3.56 kN/mm, typical of dimension series 23 (medium-section, wide); use C0 153 kN for static checks such as crane hook blocks standing under load. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.", "applications": [ "conveyor drive-pulley shafts", "medium industrial gearbox shafts", "electric-motor shafts in pumps and fans", "compressor crank and rotor shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 23 (medium-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2309, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2309 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 36 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 100 mm raceway.", "The 160/153 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2309-ECP?", "a": "SKF NJ 2309 ECP is a single-row caged cylindrical roller bearing with 45 mm bore, 100 mm OD and 36 mm width per ISO 15. SKF lists C 160 kN, C0 153 kN, Pu 20 kN, reference speed 7,500 r/min and limiting speed 8,500 r/min, mass about 1350 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2309-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2309-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ2309", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×100×36 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NUP2309-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 45×100×36 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU2309", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 45×100×36 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2309-ECP", "SKF NJ 2309 ECP" ], "locale_variants": {} }, { "sku": "NJ2310-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 2310 ECP", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 110, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 186, "static_load_kN": 186, "fatigue_load_limit_kN": 24.5, "max_rpm": 8000, "reference_speed_rpm": 6700, "limiting_speed_rpm": 8000, "weight_g": 1750, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NJ 2310 ECP is a single-row caged cylindrical roller bearing sized 50×110×40 mm — a dimension series 23 (medium-section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 1.00 (186 against 186 kN), and the Pu figure 24.5 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 6,700 r/min thermal reference speed and 8,000 r/min mechanical limiting speed. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 50 mm seat normally takes a k5 interference with an H7 housing bore when the inner ring rotates.", "applications": [ "medium industrial gearbox shafts", "electric-motor shafts in pumps and fans", "compressor crank and rotor shafts", "machine-tool radial spindle supports" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 23 (medium-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2310, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2310 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 110 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 40 mm-wide ring and concentrates load.", "The 186/186 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2310-ECP?", "a": "SKF NJ 2310 ECP is a single-row caged cylindrical roller bearing with 50 mm bore, 110 mm OD and 40 mm width per ISO 15. SKF lists C 186 kN, C0 186 kN, Pu 24.5 kN, reference speed 6,700 r/min and limiting speed 8,000 r/min, mass about 1750 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2310-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2310-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ2310", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×110×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NUP2310-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 50×110×40 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU2310", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 50×110×40 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2310-ECP", "SKF NJ 2310 ECP" ], "locale_variants": {} }, { "sku": "NJ2311-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 2311 ECP", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 120, "B_mm": 43, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 232, "static_load_kN": 232, "fatigue_load_limit_kN": 30.5, "max_rpm": 7000, "reference_speed_rpm": 6000, "limiting_speed_rpm": 7000, "weight_g": 2250, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJ 2311 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 55×120×43 mm envelope, dimension series 23 (medium-section, wide), with catalogue mass 2250 g. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The radial section height is 32.5 mm and the catalogue mass 2250 g; at 232 kN dynamic rating this is roughly 4.22 kN of C per millimetre of bore before application factors. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.", "applications": [ "electric-motor shafts in pumps and fans", "compressor crank and rotor shafts", "machine-tool radial spindle supports", "conveyor drive-pulley shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 23 (medium-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2311, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2311 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 43 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 43 mm-wide ring and concentrates load.", "The 232/232 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2311-ECP?", "a": "SKF NJ 2311 ECP is a single-row caged cylindrical roller bearing with 55 mm bore, 120 mm OD and 43 mm width per ISO 15. SKF lists C 232 kN, C0 232 kN, Pu 30.5 kN, reference speed 6,000 r/min and limiting speed 7,000 r/min, mass about 2250 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2311-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2311-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ2311", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×120×43 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NUP2311-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 55×120×43 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU2311", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 55×120×43 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2311-ECP", "SKF NJ 2311 ECP" ], "locale_variants": {} }, { "sku": "NJ2312-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 2312 ECP", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 130, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 260, "static_load_kN": 265, "fatigue_load_limit_kN": 34.5, "max_rpm": 6700, "reference_speed_rpm": 5600, "limiting_speed_rpm": 6700, "weight_g": 2800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJ 2312 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 60×130×46 mm envelope, dimension series 23 (medium-section, wide), with catalogue mass 2800 g. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. With C 260 kN and C0 265 kN, size the bearing on the 60×130 mm ISO 15 envelope and check the 34.5 kN Pu against the equivalent-load floor; the catalogue lists 5,600 r/min thermal reference speed and 6,700 r/min mechanical limiting speed. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 60 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "rolling-mill auxiliary drive shafts", "paper-machine press rolls", "cement-plant conveyor drives", "heavy gearbox and pinion shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 23 (medium-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2312, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2312 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 46 mm-wide ring and concentrates load.", "The 260/265 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2312-ECP?", "a": "SKF NJ 2312 ECP is a single-row caged cylindrical roller bearing with 60 mm bore, 130 mm OD and 46 mm width per ISO 15. SKF lists C 260 kN, C0 265 kN, Pu 34.5 kN, reference speed 5,600 r/min and limiting speed 6,700 r/min, mass about 2800 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2312-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2312-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ2312", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×130×46 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NUP2312-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 60×130×46 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU2312", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 60×130×46 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2312-ECP", "SKF NJ 2312 ECP" ], "locale_variants": {} }, { "sku": "NJ2313-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 2313 ECP", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 140, "B_mm": 48, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 285, "static_load_kN": 290, "fatigue_load_limit_kN": 38, "max_rpm": 6000, "reference_speed_rpm": 5300, "limiting_speed_rpm": 6000, "weight_g": 3350, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NJ 2313 ECP resolves to a 65×140×48 mm single-row caged cylindrical roller bearing (dimension series 23 (medium-section, wide)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Speed planning for NJ2313-ECP: the catalogue lists 5,300 r/min thermal reference speed and 6,000 r/min mechanical limiting speed. The mass entry 3350 g covers the complete catalogue execution. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.", "applications": [ "paper-machine press rolls", "cement-plant conveyor drives", "heavy gearbox and pinion shafts", "large pump and blower rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 23 (medium-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2313, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2313 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 140 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 48 mm-wide ring and concentrates load.", "The 285/290 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2313-ECP?", "a": "SKF NJ 2313 ECP is a single-row caged cylindrical roller bearing with 65 mm bore, 140 mm OD and 48 mm width per ISO 15. SKF lists C 285 kN, C0 290 kN, Pu 38 kN, reference speed 5,300 r/min and limiting speed 6,000 r/min, mass about 3350 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2313-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2313-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ2313", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×140×48 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU2313-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 65×140×48 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP2313-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 65×140×48 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2313-ECP", "SKF NJ 2313 ECP" ], "locale_variants": {} }, { "sku": "NJ2314-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 2314 ECP", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 150, "B_mm": 51, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 315, "static_load_kN": 325, "fatigue_load_limit_kN": 41.5, "max_rpm": 5600, "reference_speed_rpm": 4800, "limiting_speed_rpm": 5600, "weight_g": 4000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NJ 2314 ECP resolves to a 70×150×51 mm single-row caged cylindrical roller bearing (dimension series 23 (medium-section, wide)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 1.03 (325 against 315 kN), and the Pu figure 41.5 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 4,800 r/min thermal reference speed and 5,600 r/min mechanical limiting speed. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 70 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "heavy gearbox and pinion shafts", "large pump and blower rotors", "rolling-mill auxiliary drive shafts", "paper-machine press rolls" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 23 (medium-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2314, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2314 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 51 mm-wide ring and concentrates load.", "The 315/325 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2314-ECP?", "a": "SKF NJ 2314 ECP is a single-row caged cylindrical roller bearing with 70 mm bore, 150 mm OD and 51 mm width per ISO 15. SKF lists C 315 kN, C0 325 kN, Pu 41.5 kN, reference speed 4,800 r/min and limiting speed 5,600 r/min, mass about 4000 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2314-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2314-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ2314", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×150×51 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU2314-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 70×150×51 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP2314-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 70×150×51 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2314-ECP", "SKF NJ 2314 ECP" ], "locale_variants": {} }, { "sku": "NJ2315-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 2315 ECP", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 160, "B_mm": 55, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 380, "static_load_kN": 400, "fatigue_load_limit_kN": 50, "max_rpm": 5300, "reference_speed_rpm": 4500, "limiting_speed_rpm": 5300, "weight_g": 5000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ2315-ECP is the 75 mm bore entry in the NJ2300 range: a 75×160×55 mm single-row caged cylindrical roller bearing with a glass-fibre reinforced polyamide (PA66) window-type cage, rated C 380 kN / C0 400 kN. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The radial section height is 42.5 mm and the catalogue mass 5000 g; at 380 kN dynamic rating this is roughly 5.07 kN of C per millimetre of bore before application factors. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.", "applications": [ "large pump and blower rotors", "rolling-mill auxiliary drive shafts", "paper-machine press rolls", "cement-plant conveyor drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 23 (medium-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2315, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2315 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 160 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 55 mm-wide ring and concentrates load.", "The 380/400 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2315-ECP?", "a": "SKF NJ 2315 ECP is a single-row caged cylindrical roller bearing with 75 mm bore, 160 mm OD and 55 mm width per ISO 15. SKF lists C 380 kN, C0 400 kN, Pu 50 kN, reference speed 4,500 r/min and limiting speed 5,300 r/min, mass about 5000 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2315-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2315-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ2315", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×160×55 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU2315-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 75×160×55 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP2315-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 75×160×55 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2315-ECP", "SKF NJ 2315 ECP" ], "locale_variants": {} }, { "sku": "NJ2316-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 2316 ECP", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 170, "B_mm": 58, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 415, "static_load_kN": 440, "fatigue_load_limit_kN": 55, "max_rpm": 5000, "reference_speed_rpm": 4300, "limiting_speed_rpm": 5000, "weight_g": 5950, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 80 mm shaft, SKF lists NJ2316-ECP as single-row caged cylindrical roller: 170 mm OD, 58 mm wide, Pu 55 kN, the catalogue lists 4,300 r/min thermal reference speed and 5,000 r/min mechanical limiting speed. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. With C 415 kN and C0 440 kN, size the bearing on the 80×170 mm ISO 15 envelope and check the 55 kN Pu against the equivalent-load floor; the catalogue lists 4,300 r/min thermal reference speed and 5,000 r/min mechanical limiting speed. Fit practice for NJ2316-ECP: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "rolling-mill auxiliary drive shafts", "paper-machine press rolls", "cement-plant conveyor drives", "heavy gearbox and pinion shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 23 (medium-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2316, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2316 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 58 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 58 mm-wide ring and concentrates load.", "The 415/440 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2316-ECP?", "a": "SKF NJ 2316 ECP is a single-row caged cylindrical roller bearing with 80 mm bore, 170 mm OD and 58 mm width per ISO 15. SKF lists C 415 kN, C0 440 kN, Pu 55 kN, reference speed 4,300 r/min and limiting speed 5,000 r/min, mass about 5950 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2316-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2316-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ2316", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×170×58 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU2316-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 80×170×58 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP2316-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 80×170×58 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2316-ECP", "SKF NJ 2316 ECP" ], "locale_variants": {} }, { "sku": "NJ2317-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 2317 ECP", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 180, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 455, "static_load_kN": 490, "fatigue_load_limit_kN": 60, "max_rpm": 4800, "reference_speed_rpm": 4000, "limiting_speed_rpm": 4800, "weight_g": 7000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 85 mm shaft, SKF lists NJ2317-ECP as single-row caged cylindrical roller: 180 mm OD, 60 mm wide, Pu 60 kN, the catalogue lists 4,000 r/min thermal reference speed and 4,800 r/min mechanical limiting speed. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Speed planning for NJ2317-ECP: the catalogue lists 4,000 r/min thermal reference speed and 4,800 r/min mechanical limiting speed. The mass entry 7000 g covers the complete catalogue execution. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.", "applications": [ "paper-machine press rolls", "cement-plant conveyor drives", "heavy gearbox and pinion shafts", "large pump and blower rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 23 (medium-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2317, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2317 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 60 mm-wide ring and concentrates load.", "The 455/490 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2317-ECP?", "a": "SKF NJ 2317 ECP is a single-row caged cylindrical roller bearing with 85 mm bore, 180 mm OD and 60 mm width per ISO 15. SKF lists C 455 kN, C0 490 kN, Pu 60 kN, reference speed 4,000 r/min and limiting speed 4,800 r/min, mass about 7000 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2317-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2317-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ2317", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×180×60 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU2317-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 85×180×60 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP2317-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 85×180×60 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2317-ECP", "SKF NJ 2317 ECP" ], "locale_variants": {} }, { "sku": "NJ2318-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 2318 ECP", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 190, "B_mm": 64, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 500, "static_load_kN": 540, "fatigue_load_limit_kN": 65.5, "max_rpm": 4500, "reference_speed_rpm": 3800, "limiting_speed_rpm": 4500, "weight_g": 8150, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NJ 2318 ECP is a single-row caged cylindrical roller bearing sized 90×190×64 mm — a dimension series 23 (medium-section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Load-per-bore for the 90 mm seat is about 5.56 kN/mm, typical of dimension series 23 (medium-section, wide); use C0 540 kN for static checks such as crane hook blocks standing under load. Fit practice for NJ2318-ECP: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "cement-plant conveyor drives", "heavy gearbox and pinion shafts", "large pump and blower rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 23 (medium-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2318, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2318 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 190 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 64 mm-wide ring and concentrates load.", "The 500/540 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2318-ECP?", "a": "SKF NJ 2318 ECP is a single-row caged cylindrical roller bearing with 90 mm bore, 190 mm OD and 64 mm width per ISO 15. SKF lists C 500 kN, C0 540 kN, Pu 65.5 kN, reference speed 3,800 r/min and limiting speed 4,500 r/min, mass about 8150 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2318-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2318-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ2318", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×190×64 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU2318-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 90×190×64 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP2318-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 90×190×64 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2318-ECP", "SKF NJ 2318 ECP" ], "locale_variants": {} }, { "sku": "NJ2319-ECJ", "brand": "SKF", "manufacturer_designation": "SKF NJ 2319 ECJ", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 95, "D_mm": 200, "B_mm": 67, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 530, "static_load_kN": 585, "fatigue_load_limit_kN": 69.5, "max_rpm": 4300, "reference_speed_rpm": 3600, "limiting_speed_rpm": 4300, "weight_g": 9550, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NJ 2319 ECJ resolves to a 95×200×67 mm single-row caged cylindrical roller bearing (dimension series 23 (medium-section, wide)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECJ: the E-design execution with a pressed sheet-steel window cage, for positions where polymer cages are temperature- or lubricant-limited. Selection arithmetic: C0/C ≈ 1.10 (585 against 530 kN), and the Pu figure 69.5 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 3,600 r/min thermal reference speed and 4,300 r/min mechanical limiting speed. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C.", "applications": [ "heavy gearbox and pinion shafts", "large pump and blower rotors", "rolling-mill auxiliary drive shafts", "paper-machine press rolls" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 23 (medium-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2319, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2319 ECJ and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 67 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 67 mm-wide ring and concentrates load.", "The 530/585 kN ratings are SKF catalogue 17000 (2018) values for the ECJ execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2319-ECJ?", "a": "SKF NJ 2319 ECJ is a single-row caged cylindrical roller bearing with 95 mm bore, 200 mm OD and 67 mm width per ISO 15. SKF lists C 530 kN, C0 585 kN, Pu 69.5 kN, reference speed 3,600 r/min and limiting speed 4,300 r/min, mass about 9550 g." }, { "q": "What does the NJ designation and ECJ suffix mean?", "a": "The ECJ suffix marks the E-design execution with a pressed sheet-steel window cage, useful where polymer cages are temperature- or lubricant-limited. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2319-ECJ take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2319-ECJ compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ2319", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×200×67 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU2319-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 95×200×67 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP2319-ECJ", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 95×200×67 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2319-ECJ", "SKF NJ 2319 ECJ" ], "locale_variants": {} }, { "sku": "NJ232-ECML", "brand": "SKF", "manufacturer_designation": "SKF NJ 232 ECML", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 160, "D_mm": 290, "B_mm": 48, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 585, "static_load_kN": 680, "fatigue_load_limit_kN": 72, "max_rpm": 4000, "reference_speed_rpm": 2400, "limiting_speed_rpm": 4000, "weight_g": 14500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NJ 232 ECML resolves to a 160×290×48 mm single-row caged cylindrical roller bearing (dimension series 2 (light-section ISO 15 envelope)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. The one-piece machined brass cage is reflected in the published speeds and temperature limits. Load-per-bore for the 160 mm seat is about 3.66 kN/mm, typical of dimension series 2 (light-section ISO 15 envelope); use C0 680 kN for static checks such as crane hook blocks standing under load. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C.", "applications": [ "offshore drawworks shafts", "large rolling-mill drive trains", "marine propulsion line shafts", "heavy turbogenerator rotor supports" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 232, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 232 ECML and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 290 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 290 mm raceway.", "The 585/680 kN ratings are SKF catalogue 17000 (2018) values for the ECML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ232-ECML?", "a": "SKF NJ 232 ECML is a single-row caged cylindrical roller bearing with 160 mm bore, 290 mm OD and 48 mm width per ISO 15. SKF lists C 585 kN, C0 680 kN, Pu 72 kN, reference speed 2,400 r/min and limiting speed 4,000 r/min, mass about 14500 g." }, { "q": "What does the NJ designation and ECML suffix mean?", "a": "The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ232-ECML take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ232-ECML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ232", "equiv_brand": "NTN", "level": "partial", "note": "Same 160×290×48 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU232-ECM", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 160×290×48 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP232-ECM", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 160×290×48 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ232-ECML", "SKF NJ 232 ECML" ], "locale_variants": {} }, { "sku": "NJ2320-ECJ", "brand": "SKF", "manufacturer_designation": "SKF NJ 2320 ECJ", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 215, "B_mm": 73, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 670, "static_load_kN": 735, "fatigue_load_limit_kN": 85, "max_rpm": 3800, "reference_speed_rpm": 3200, "limiting_speed_rpm": 3800, "weight_g": 12000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJ 2320 ECJ denotes a single-row caged cylindrical roller bearing on the ISO 15 100×215×73 mm envelope, dimension series 23 (medium-section, wide), with catalogue mass 12000 g. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECJ suffix marks the E-design execution with a pressed sheet-steel window cage, useful where polymer cages are temperature- or lubricant-limited. The pressed sheet-steel window-type cage is reflected in the published speeds and temperature limits. The radial section height is 57.5 mm and the catalogue mass 12000 g; at 670 kN dynamic rating this is roughly 6.70 kN of C per millimetre of bore before application factors. Fit practice for NJ2320-ECJ: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "large pump and blower rotors", "rolling-mill auxiliary drive shafts", "paper-machine press rolls", "cement-plant conveyor drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 23 (medium-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2320, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2320 ECJ and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 215 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 670/735 kN ratings are SKF catalogue 17000 (2018) values for the ECJ execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2320-ECJ?", "a": "SKF NJ 2320 ECJ is a single-row caged cylindrical roller bearing with 100 mm bore, 215 mm OD and 73 mm width per ISO 15. SKF lists C 670 kN, C0 735 kN, Pu 85 kN, reference speed 3,200 r/min and limiting speed 3,800 r/min, mass about 12000 g." }, { "q": "What does the NJ designation and ECJ suffix mean?", "a": "The ECJ suffix marks the E-design execution with a pressed sheet-steel window cage, useful where polymer cages are temperature- or lubricant-limited. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2320-ECJ take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2320-ECJ compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ2320", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×215×73 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU2320-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 100×215×73 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP2320-ECJ", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 100×215×73 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2320-ECJ", "SKF NJ 2320 ECJ" ], "locale_variants": {} }, { "sku": "NJ2322-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 2322 ECP", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 240, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 780, "static_load_kN": 900, "fatigue_load_limit_kN": 102, "max_rpm": 3400, "reference_speed_rpm": 3000, "limiting_speed_rpm": 3400, "weight_g": 17000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NJ 2322 ECP is a single-row caged cylindrical roller bearing sized 110×240×80 mm — a dimension series 23 (medium-section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Speed planning for NJ2322-ECP: the catalogue lists 3,000 r/min thermal reference speed and 3,400 r/min mechanical limiting speed. The mass entry 17000 g covers the complete catalogue execution. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 110 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "paper-machine press rolls", "cement-plant conveyor drives", "heavy gearbox and pinion shafts", "large pump and blower rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 23 (medium-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2322, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2322 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 240 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 240 mm raceway.", "The 780/900 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2322-ECP?", "a": "SKF NJ 2322 ECP is a single-row caged cylindrical roller bearing with 110 mm bore, 240 mm OD and 80 mm width per ISO 15. SKF lists C 780 kN, C0 900 kN, Pu 102 kN, reference speed 3,000 r/min and limiting speed 3,400 r/min, mass about 17000 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2322-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2322-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ2322", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×240×80 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU2322-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 110×240×80 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP2322-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 110×240×80 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2322-ECP", "SKF NJ 2322 ECP" ], "locale_variants": {} }, { "sku": "NJ2324-ECML", "brand": "SKF", "manufacturer_designation": "SKF NJ 2324 ECML", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 260, "B_mm": 86, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 915, "static_load_kN": 1040, "fatigue_load_limit_kN": 116, "max_rpm": 5000, "reference_speed_rpm": 2800, "limiting_speed_rpm": 5000, "weight_g": 23000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NJ 2324 ECML is a single-row caged cylindrical roller bearing sized 120×260×86 mm — a dimension series 23 (medium-section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. The one-piece machined brass cage is reflected in the published speeds and temperature limits. The radial section height is 70.0 mm and the catalogue mass 23000 g; at 915 kN dynamic rating this is roughly 7.63 kN of C per millimetre of bore before application factors. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C.", "applications": [ "marine propulsion line shafts", "heavy turbogenerator rotor supports", "mining hoist and winder shafts", "offshore drawworks shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 23 (medium-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2324, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2324 ECML and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 260 mm raceway.", "The 915/1040 kN ratings are SKF catalogue 17000 (2018) values for the ECML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2324-ECML?", "a": "SKF NJ 2324 ECML is a single-row caged cylindrical roller bearing with 120 mm bore, 260 mm OD and 86 mm width per ISO 15. SKF lists C 915 kN, C0 1040 kN, Pu 116 kN, reference speed 2,800 r/min and limiting speed 5,000 r/min, mass about 23000 g." }, { "q": "What does the NJ designation and ECML suffix mean?", "a": "The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2324-ECML take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2324-ECML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ2324", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×260×86 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU2324-ECML", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 120×260×86 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP2324-ECML", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 120×260×86 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2324-ECML", "SKF NJ 2324 ECML" ], "locale_variants": {} }, { "sku": "NJ2326-ECML", "brand": "SKF", "manufacturer_designation": "SKF NJ 2326 ECML", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 280, "B_mm": 93, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 1060, "static_load_kN": 1250, "fatigue_load_limit_kN": 137, "max_rpm": 4500, "reference_speed_rpm": 2400, "limiting_speed_rpm": 4500, "weight_g": 29500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NJ 2326 ECML resolves to a 130×280×93 mm single-row caged cylindrical roller bearing (dimension series 23 (medium-section, wide)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. With C 1060 kN and C0 1250 kN, size the bearing on the 130×280 mm ISO 15 envelope and check the 137 kN Pu against the equivalent-load floor; the catalogue lists 2,400 r/min thermal reference speed and 4,500 r/min mechanical limiting speed. Fit practice for NJ2326-ECML: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "heavy turbogenerator rotor supports", "mining hoist and winder shafts", "offshore drawworks shafts", "large rolling-mill drive trains" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 23 (medium-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2326, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2326 ECML and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 280 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 93 mm-wide ring and concentrates load.", "The 1060/1250 kN ratings are SKF catalogue 17000 (2018) values for the ECML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2326-ECML?", "a": "SKF NJ 2326 ECML is a single-row caged cylindrical roller bearing with 130 mm bore, 280 mm OD and 93 mm width per ISO 15. SKF lists C 1060 kN, C0 1250 kN, Pu 137 kN, reference speed 2,400 r/min and limiting speed 4,500 r/min, mass about 29500 g." }, { "q": "What does the NJ designation and ECML suffix mean?", "a": "The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2326-ECML take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2326-ECML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ2326", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×280×93 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU2326-ECML", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 130×280×93 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP2326-ECML", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 130×280×93 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2326-ECML", "SKF NJ 2326 ECML" ], "locale_variants": {} }, { "sku": "NJ2328-ECML", "brand": "SKF", "manufacturer_designation": "SKF NJ 2328 ECML", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 300, "B_mm": 102, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 1200, "static_load_kN": 1430, "fatigue_load_limit_kN": 150, "max_rpm": 4300, "reference_speed_rpm": 2400, "limiting_speed_rpm": 4300, "weight_g": 36500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 140 mm shaft, SKF lists NJ2328-ECML as single-row caged cylindrical roller: 300 mm OD, 102 mm wide, Pu 150 kN, the catalogue lists 2,400 r/min thermal reference speed and 4,300 r/min mechanical limiting speed. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Load-per-bore for the 140 mm seat is about 8.57 kN/mm, typical of dimension series 23 (medium-section, wide); use C0 1430 kN for static checks such as crane hook blocks standing under load. Fit practice for NJ2328-ECML: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "offshore drawworks shafts", "large rolling-mill drive trains", "marine propulsion line shafts", "heavy turbogenerator rotor supports" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 23 (medium-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2328, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2328 ECML and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 102 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 102 mm-wide ring and concentrates load.", "The 1200/1430 kN ratings are SKF catalogue 17000 (2018) values for the ECML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2328-ECML?", "a": "SKF NJ 2328 ECML is a single-row caged cylindrical roller bearing with 140 mm bore, 300 mm OD and 102 mm width per ISO 15. SKF lists C 1200 kN, C0 1430 kN, Pu 150 kN, reference speed 2,400 r/min and limiting speed 4,300 r/min, mass about 36500 g." }, { "q": "What does the NJ designation and ECML suffix mean?", "a": "The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2328-ECML take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2328-ECML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ2328", "equiv_brand": "NTN", "level": "partial", "note": "Same 140×300×102 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU2328-ECML", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 140×300×102 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP2328-ECML", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 140×300×102 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2328-ECML", "SKF NJ 2328 ECML" ], "locale_variants": {} }, { "sku": "NJ2330-ECML", "brand": "SKF", "manufacturer_designation": "SKF NJ 2330 ECML", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 320, "B_mm": 108, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 1370, "static_load_kN": 1630, "fatigue_load_limit_kN": 170, "max_rpm": 4000, "reference_speed_rpm": 2200, "limiting_speed_rpm": 4000, "weight_g": 43000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 150 mm shaft, SKF lists NJ2330-ECML as single-row caged cylindrical roller: 320 mm OD, 108 mm wide, Pu 170 kN, the catalogue lists 2,200 r/min thermal reference speed and 4,000 r/min mechanical limiting speed. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Load-per-bore for the 150 mm seat is about 9.13 kN/mm, typical of dimension series 23 (medium-section, wide); use C0 1630 kN for static checks such as crane hook blocks standing under load. Fit practice for NJ2330-ECML: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "offshore drawworks shafts", "large rolling-mill drive trains", "marine propulsion line shafts", "heavy turbogenerator rotor supports" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 23 (medium-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2330, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2330 ECML and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 320 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 108 mm-wide ring and concentrates load.", "The 1370/1630 kN ratings are SKF catalogue 17000 (2018) values for the ECML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2330-ECML?", "a": "SKF NJ 2330 ECML is a single-row caged cylindrical roller bearing with 150 mm bore, 320 mm OD and 108 mm width per ISO 15. SKF lists C 1370 kN, C0 1630 kN, Pu 170 kN, reference speed 2,200 r/min and limiting speed 4,000 r/min, mass about 43000 g." }, { "q": "What does the NJ designation and ECML suffix mean?", "a": "The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2330-ECML take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2330-ECML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ2330", "equiv_brand": "NTN", "level": "partial", "note": "Same 150×320×108 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU2330-ECML", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 150×320×108 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2330-ECML", "SKF NJ 2330 ECML" ], "locale_variants": {} }, { "sku": "NJ2332-ECML", "brand": "SKF", "manufacturer_designation": "SKF NJ 2332 ECML", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 160, "D_mm": 340, "B_mm": 114, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 1250, "static_load_kN": 1730, "fatigue_load_limit_kN": 173, "max_rpm": 3600, "reference_speed_rpm": 1800, "limiting_speed_rpm": 3600, "weight_g": 50500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJ 2332 ECML denotes a single-row caged cylindrical roller bearing on the ISO 15 160×340×114 mm envelope, dimension series 23 (medium-section, wide), with catalogue mass 50500 g. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. The radial section height is 90.0 mm and the catalogue mass 50500 g; at 1250 kN dynamic rating this is roughly 7.81 kN of C per millimetre of bore before application factors. Fit practice for NJ2332-ECML: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "marine propulsion line shafts", "heavy turbogenerator rotor supports", "mining hoist and winder shafts", "offshore drawworks shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 23 (medium-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2332, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2332 ECML and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 114 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 114 mm-wide ring and concentrates load.", "The 1250/1730 kN ratings are SKF catalogue 17000 (2018) values for the ECML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2332-ECML?", "a": "SKF NJ 2332 ECML is a single-row caged cylindrical roller bearing with 160 mm bore, 340 mm OD and 114 mm width per ISO 15. SKF lists C 1250 kN, C0 1730 kN, Pu 173 kN, reference speed 1,800 r/min and limiting speed 3,600 r/min, mass about 50500 g." }, { "q": "What does the NJ designation and ECML suffix mean?", "a": "The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2332-ECML take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2332-ECML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ2332", "equiv_brand": "NTN", "level": "partial", "note": "Same 160×340×114 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU2332-ECML", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 160×340×114 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2332-ECML", "SKF NJ 2332 ECML" ], "locale_variants": {} }, { "sku": "NJ2334-ECML", "brand": "SKF", "manufacturer_designation": "SKF NJ 2334 ECML", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 170, "D_mm": 360, "B_mm": 120, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 1450, "static_load_kN": 2040, "fatigue_load_limit_kN": 204, "max_rpm": 3400, "reference_speed_rpm": 1700, "limiting_speed_rpm": 3400, "weight_g": 60500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ2334-ECML is the 170 mm bore entry in the NJ2300 range: a 170×360×120 mm single-row caged cylindrical roller bearing with a one-piece machined brass cage, rated C 1450 kN / C0 2040 kN. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECML: the E-design ECML execution with a one-piece machined brass cage for higher-temperature, higher-speed continuous duty. With C 1450 kN and C0 2040 kN, size the bearing on the 170×360 mm ISO 15 envelope and check the 204 kN Pu against the equivalent-load floor; the catalogue lists 1,700 r/min thermal reference speed and 3,400 r/min mechanical limiting speed. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 170 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "heavy turbogenerator rotor supports", "mining hoist and winder shafts", "offshore drawworks shafts", "large rolling-mill drive trains" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 23 (medium-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2334, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2334 ECML and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 1450/2040 kN ratings are SKF catalogue 17000 (2018) values for the ECML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2334-ECML?", "a": "SKF NJ 2334 ECML is a single-row caged cylindrical roller bearing with 170 mm bore, 360 mm OD and 120 mm width per ISO 15. SKF lists C 1450 kN, C0 2040 kN, Pu 204 kN, reference speed 1,700 r/min and limiting speed 3,400 r/min, mass about 60500 g." }, { "q": "What does the NJ designation and ECML suffix mean?", "a": "The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2334-ECML take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2334-ECML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ2334", "equiv_brand": "NTN", "level": "partial", "note": "Same 170×360×120 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU2334-ECML", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 170×360×120 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2334-ECML", "SKF NJ 2334 ECML" ], "locale_variants": {} }, { "sku": "NJ2336-ECML", "brand": "SKF", "manufacturer_designation": "SKF NJ 2336 ECML", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 180, "D_mm": 380, "B_mm": 126, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 1610, "static_load_kN": 2240, "fatigue_load_limit_kN": 216, "max_rpm": 3200, "reference_speed_rpm": 1600, "limiting_speed_rpm": 3200, "weight_g": 70500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJ 2336 ECML denotes a single-row caged cylindrical roller bearing on the ISO 15 180×380×126 mm envelope, dimension series 23 (medium-section, wide), with catalogue mass 70500 g. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. The one-piece machined brass cage is reflected in the published speeds and temperature limits. Load-per-bore for the 180 mm seat is about 8.94 kN/mm, typical of dimension series 23 (medium-section, wide); use C0 2240 kN for static checks such as crane hook blocks standing under load. Fit practice for NJ2336-ECML: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "offshore drawworks shafts", "large rolling-mill drive trains", "marine propulsion line shafts", "heavy turbogenerator rotor supports" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 23 (medium-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2336, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2336 ECML and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 380 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 1610/2240 kN ratings are SKF catalogue 17000 (2018) values for the ECML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2336-ECML?", "a": "SKF NJ 2336 ECML is a single-row caged cylindrical roller bearing with 180 mm bore, 380 mm OD and 126 mm width per ISO 15. SKF lists C 1610 kN, C0 2240 kN, Pu 216 kN, reference speed 1,600 r/min and limiting speed 3,200 r/min, mass about 70500 g." }, { "q": "What does the NJ designation and ECML suffix mean?", "a": "The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2336-ECML take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2336-ECML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ2336", "equiv_brand": "NTN", "level": "partial", "note": "Same 180×380×126 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU2336-ECML", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 180×380×126 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2336-ECML", "SKF NJ 2336 ECML" ], "locale_variants": {} }, { "sku": "NJ2338-ECML", "brand": "SKF", "manufacturer_designation": "SKF NJ 2338 ECML", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 190, "D_mm": 400, "B_mm": 132, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 1830, "static_load_kN": 2550, "fatigue_load_limit_kN": 236, "max_rpm": 3000, "reference_speed_rpm": 1500, "limiting_speed_rpm": 3000, "weight_g": 82000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ2338-ECML is the 190 mm bore entry in the NJ2300 range: a 190×400×132 mm single-row caged cylindrical roller bearing with a one-piece machined brass cage, rated C 1830 kN / C0 2550 kN. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. The one-piece machined brass cage is reflected in the published speeds and temperature limits. The radial section height is 105.0 mm and the catalogue mass 82000 g; at 1830 kN dynamic rating this is roughly 9.63 kN of C per millimetre of bore before application factors. Fit practice for NJ2338-ECML: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "marine propulsion line shafts", "heavy turbogenerator rotor supports", "mining hoist and winder shafts", "offshore drawworks shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 23 (medium-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2338, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2338 ECML and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 132 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 1830/2550 kN ratings are SKF catalogue 17000 (2018) values for the ECML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2338-ECML?", "a": "SKF NJ 2338 ECML is a single-row caged cylindrical roller bearing with 190 mm bore, 400 mm OD and 132 mm width per ISO 15. SKF lists C 1830 kN, C0 2550 kN, Pu 236 kN, reference speed 1,500 r/min and limiting speed 3,000 r/min, mass about 82000 g." }, { "q": "What does the NJ designation and ECML suffix mean?", "a": "The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2338-ECML take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2338-ECML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ2338", "equiv_brand": "NTN", "level": "partial", "note": "Same 190×400×132 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU2338-ECML", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 190×400×132 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2338-ECML", "SKF NJ 2338 ECML" ], "locale_variants": {} }, { "sku": "NJ234-ECML", "brand": "SKF", "manufacturer_designation": "SKF NJ 234 ECML", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 170, "D_mm": 310, "B_mm": 52, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 695, "static_load_kN": 815, "fatigue_load_limit_kN": 85, "max_rpm": 3800, "reference_speed_rpm": 2200, "limiting_speed_rpm": 3800, "weight_g": 17500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NJ 234 ECML is a single-row caged cylindrical roller bearing sized 170×310×52 mm — a dimension series 2 (light-section ISO 15 envelope), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. The radial section height is 70.0 mm and the catalogue mass 17500 g; at 695 kN dynamic rating this is roughly 4.09 kN of C per millimetre of bore before application factors. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 170 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "marine propulsion line shafts", "heavy turbogenerator rotor supports", "mining hoist and winder shafts", "offshore drawworks shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 234, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 234 ECML and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 52 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 310 mm raceway.", "The 695/815 kN ratings are SKF catalogue 17000 (2018) values for the ECML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ234-ECML?", "a": "SKF NJ 234 ECML is a single-row caged cylindrical roller bearing with 170 mm bore, 310 mm OD and 52 mm width per ISO 15. SKF lists C 695 kN, C0 815 kN, Pu 85 kN, reference speed 2,200 r/min and limiting speed 3,800 r/min, mass about 17500 g." }, { "q": "What does the NJ designation and ECML suffix mean?", "a": "The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ234-ECML take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ234-ECML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ234", "equiv_brand": "NTN", "level": "partial", "note": "Same 170×310×52 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU234-ECML", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 170×310×52 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ234-ECML", "SKF NJ 234 ECML" ], "locale_variants": {} }, { "sku": "NJ2340-ECML", "brand": "SKF", "manufacturer_designation": "SKF NJ 2340 ECML", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 200, "D_mm": 420, "B_mm": 138, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 1980, "static_load_kN": 2800, "fatigue_load_limit_kN": 255, "max_rpm": 2800, "reference_speed_rpm": 1400, "limiting_speed_rpm": 2800, "weight_g": 94000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NJ 2340 ECML resolves to a 200×420×138 mm single-row caged cylindrical roller bearing (dimension series 23 (medium-section, wide)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECML: the E-design ECML execution with a one-piece machined brass cage for higher-temperature, higher-speed continuous duty. The radial section height is 110.0 mm and the catalogue mass 94000 g; at 1980 kN dynamic rating this is roughly 9.90 kN of C per millimetre of bore before application factors. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 200 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "marine propulsion line shafts", "heavy turbogenerator rotor supports", "mining hoist and winder shafts", "offshore drawworks shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 23 (medium-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2340, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2340 ECML and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 420 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 1980/2800 kN ratings are SKF catalogue 17000 (2018) values for the ECML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2340-ECML?", "a": "SKF NJ 2340 ECML is a single-row caged cylindrical roller bearing with 200 mm bore, 420 mm OD and 138 mm width per ISO 15. SKF lists C 1980 kN, C0 2800 kN, Pu 255 kN, reference speed 1,400 r/min and limiting speed 2,800 r/min, mass about 94000 g." }, { "q": "What does the NJ designation and ECML suffix mean?", "a": "The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2340-ECML take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2340-ECML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ2340", "equiv_brand": "NTN", "level": "partial", "note": "Same 200×420×138 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU2340-ECML", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 200×420×138 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2340-ECML", "SKF NJ 2340 ECML" ], "locale_variants": {} }, { "sku": "NJ2352-ECMA", "brand": "SKF", "manufacturer_designation": "SKF NJ 2352 ECMA", "series": "NJ2300-series", "type": "cylindrical_roller", "d_mm": 260, "D_mm": 540, "B_mm": 165, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 3140, "static_load_kN": 4550, "fatigue_load_limit_kN": 400, "max_rpm": 1900, "reference_speed_rpm": 1100, "limiting_speed_rpm": 1900, "weight_g": 196000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NJ 2352 ECMA is a single-row caged cylindrical roller bearing sized 260×540×165 mm — a dimension series 23 (medium-section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECMA: the E-design ECMA execution with a one-piece machined brass cage for higher-temperature, higher-speed continuous duty. Load-per-bore for the 260 mm seat is about 12.08 kN/mm, typical of dimension series 23 (medium-section, wide); use C0 4550 kN for static checks such as crane hook blocks standing under load. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 260 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "offshore drawworks shafts", "large rolling-mill drive trains", "marine propulsion line shafts", "heavy turbogenerator rotor supports" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 23 (medium-section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2352, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2352 ECMA and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 3140/4550 kN ratings are SKF catalogue 17000 (2018) values for the ECMA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2352-ECMA?", "a": "SKF NJ 2352 ECMA is a single-row caged cylindrical roller bearing with 260 mm bore, 540 mm OD and 165 mm width per ISO 15. SKF lists C 3140 kN, C0 4550 kN, Pu 400 kN, reference speed 1,100 r/min and limiting speed 1,900 r/min, mass about 196000 g." }, { "q": "What does the NJ designation and ECMA suffix mean?", "a": "The ECMA suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2352-ECMA take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2352-ECMA compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ2352", "equiv_brand": "NTN", "level": "partial", "note": "Same 260×540×165 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU2352-ECMA", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 260×540×165 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2352-ECMA", "SKF NJ 2352 ECMA" ], "locale_variants": {} }, { "sku": "NJ236-ECML", "brand": "SKF", "manufacturer_designation": "SKF NJ 236 ECML", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 180, "D_mm": 320, "B_mm": 52, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 720, "static_load_kN": 850, "fatigue_load_limit_kN": 88, "max_rpm": 3600, "reference_speed_rpm": 2200, "limiting_speed_rpm": 3600, "weight_g": 18500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NJ 236 ECML resolves to a 180×320×52 mm single-row caged cylindrical roller bearing (dimension series 2 (light-section ISO 15 envelope)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Speed planning for NJ236-ECML: the catalogue lists 2,200 r/min thermal reference speed and 3,600 r/min mechanical limiting speed. The mass entry 18500 g covers the complete catalogue execution. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 180 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "mining hoist and winder shafts", "offshore drawworks shafts", "large rolling-mill drive trains", "marine propulsion line shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 236, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 236 ECML and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 320 mm raceway.", "The 720/850 kN ratings are SKF catalogue 17000 (2018) values for the ECML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ236-ECML?", "a": "SKF NJ 236 ECML is a single-row caged cylindrical roller bearing with 180 mm bore, 320 mm OD and 52 mm width per ISO 15. SKF lists C 720 kN, C0 850 kN, Pu 88 kN, reference speed 2,200 r/min and limiting speed 3,600 r/min, mass about 18500 g." }, { "q": "What does the NJ designation and ECML suffix mean?", "a": "The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ236-ECML take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ236-ECML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ236", "equiv_brand": "NTN", "level": "partial", "note": "Same 180×320×52 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU236-ECML", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 180×320×52 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ236-ECML", "SKF NJ 236 ECML" ], "locale_variants": {} }, { "sku": "NJ238-ECML", "brand": "SKF", "manufacturer_designation": "SKF NJ 238 ECML", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 190, "D_mm": 340, "B_mm": 55, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 800, "static_load_kN": 965, "fatigue_load_limit_kN": 98, "max_rpm": 3400, "reference_speed_rpm": 2000, "limiting_speed_rpm": 3400, "weight_g": 22000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 190 mm shaft, SKF lists NJ238-ECML as single-row caged cylindrical roller: 340 mm OD, 55 mm wide, Pu 98 kN, the catalogue lists 2,000 r/min thermal reference speed and 3,400 r/min mechanical limiting speed. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Selection arithmetic: C0/C ≈ 1.21 (965 against 800 kN), and the Pu figure 98 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 2,000 r/min thermal reference speed and 3,400 r/min mechanical limiting speed. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 190 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "large rolling-mill drive trains", "marine propulsion line shafts", "heavy turbogenerator rotor supports", "mining hoist and winder shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 238, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 238 ECML and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 340 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 340 mm raceway.", "The 800/965 kN ratings are SKF catalogue 17000 (2018) values for the ECML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ238-ECML?", "a": "SKF NJ 238 ECML is a single-row caged cylindrical roller bearing with 190 mm bore, 340 mm OD and 55 mm width per ISO 15. SKF lists C 800 kN, C0 965 kN, Pu 98 kN, reference speed 2,000 r/min and limiting speed 3,400 r/min, mass about 22000 g." }, { "q": "What does the NJ designation and ECML suffix mean?", "a": "The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ238-ECML take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ238-ECML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ238", "equiv_brand": "NTN", "level": "partial", "note": "Same 190×340×55 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU238-ECML", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 190×340×55 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP238-ECML", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 190×340×55 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ238-ECML", "SKF NJ 238 ECML" ], "locale_variants": {} }, { "sku": "NJ240-ECML", "brand": "SKF", "manufacturer_designation": "SKF NJ 240 ECML", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 200, "D_mm": 360, "B_mm": 58, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 880, "static_load_kN": 1060, "fatigue_load_limit_kN": 106, "max_rpm": 3200, "reference_speed_rpm": 1900, "limiting_speed_rpm": 3200, "weight_g": 27000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 200 mm shaft, SKF lists NJ240-ECML as single-row caged cylindrical roller: 360 mm OD, 58 mm wide, Pu 106 kN, the catalogue lists 1,900 r/min thermal reference speed and 3,200 r/min mechanical limiting speed. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECML: the E-design ECML execution with a one-piece machined brass cage for higher-temperature, higher-speed continuous duty. Load-per-bore for the 200 mm seat is about 4.40 kN/mm, typical of dimension series 2 (light-section ISO 15 envelope); use C0 1060 kN for static checks such as crane hook blocks standing under load. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C.", "applications": [ "offshore drawworks shafts", "large rolling-mill drive trains", "marine propulsion line shafts", "heavy turbogenerator rotor supports" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 240, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 240 ECML and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 58 mm-wide ring and concentrates load.", "The 880/1060 kN ratings are SKF catalogue 17000 (2018) values for the ECML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ240-ECML?", "a": "SKF NJ 240 ECML is a single-row caged cylindrical roller bearing with 200 mm bore, 360 mm OD and 58 mm width per ISO 15. SKF lists C 880 kN, C0 1060 kN, Pu 106 kN, reference speed 1,900 r/min and limiting speed 3,200 r/min, mass about 27000 g." }, { "q": "What does the NJ designation and ECML suffix mean?", "a": "The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ240-ECML take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ240-ECML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ240", "equiv_brand": "NTN", "level": "partial", "note": "Same 200×360×58 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU240-ECML", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 200×360×58 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ240-ECML", "SKF NJ 240 ECML" ], "locale_variants": {} }, { "sku": "NJ244-ECML", "brand": "SKF", "manufacturer_designation": "SKF NJ 244 ECML", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 220, "D_mm": 400, "B_mm": 65, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 1060, "static_load_kN": 1290, "fatigue_load_limit_kN": 125, "max_rpm": 3000, "reference_speed_rpm": 1700, "limiting_speed_rpm": 3000, "weight_g": 37000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ244-ECML is the 220 mm bore entry in the NJ200 range: a 220×400×65 mm single-row caged cylindrical roller bearing with a one-piece machined brass cage, rated C 1060 kN / C0 1290 kN. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECML: the E-design ECML execution with a one-piece machined brass cage for higher-temperature, higher-speed continuous duty. Speed planning for NJ244-ECML: the catalogue lists 1,700 r/min thermal reference speed and 3,000 r/min mechanical limiting speed. The mass entry 37000 g covers the complete catalogue execution. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C.", "applications": [ "mining hoist and winder shafts", "offshore drawworks shafts", "large rolling-mill drive trains", "marine propulsion line shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 244, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 244 ECML and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 65 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 65 mm-wide ring and concentrates load.", "The 1060/1290 kN ratings are SKF catalogue 17000 (2018) values for the ECML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ244-ECML?", "a": "SKF NJ 244 ECML is a single-row caged cylindrical roller bearing with 220 mm bore, 400 mm OD and 65 mm width per ISO 15. SKF lists C 1060 kN, C0 1290 kN, Pu 125 kN, reference speed 1,700 r/min and limiting speed 3,000 r/min, mass about 37000 g." }, { "q": "What does the NJ designation and ECML suffix mean?", "a": "The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ244-ECML take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ244-ECML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ244", "equiv_brand": "NTN", "level": "partial", "note": "Same 220×400×65 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU244-ECML", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 220×400×65 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP244-ECML", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 220×400×65 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ244-ECML", "SKF NJ 244 ECML" ], "locale_variants": {} }, { "sku": "NJ248-MA", "brand": "SKF", "manufacturer_designation": "SKF NJ 248 MA", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 240, "D_mm": 440, "B_mm": 72, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 952, "static_load_kN": 1370, "fatigue_load_limit_kN": 129, "max_rpm": 2200, "reference_speed_rpm": 1600, "limiting_speed_rpm": 2200, "weight_g": 53000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJ 248 MA denotes a single-row caged cylindrical roller bearing on the ISO 15 240×440×72 mm envelope, dimension series 2 (light-section ISO 15 envelope), with catalogue mass 53000 g. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix MA: the basic (non-E) MA execution with a machined brass cage, standard for the larger and earlier-design sizes. Selection arithmetic: C0/C ≈ 1.44 (1370 against 952 kN), and the Pu figure 129 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 1,600 r/min thermal reference speed and 2,200 r/min mechanical limiting speed. Fit practice for NJ248-MA: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "large rolling-mill drive trains", "marine propulsion line shafts", "heavy turbogenerator rotor supports", "mining hoist and winder shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 248, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 248 MA and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 440 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 440 mm raceway.", "The 952/1370 kN ratings are SKF catalogue 17000 (2018) values for the MA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ248-MA?", "a": "SKF NJ 248 MA is a single-row caged cylindrical roller bearing with 240 mm bore, 440 mm OD and 72 mm width per ISO 15. SKF lists C 952 kN, C0 1370 kN, Pu 129 kN, reference speed 1,600 r/min and limiting speed 2,200 r/min, mass about 53000 g." }, { "q": "What does the NJ designation and MA suffix mean?", "a": "The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ248-MA take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ248-MA compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ248", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "NU248-MA", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 240×440×72 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP248-MA", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 240×440×72 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ248-MA", "SKF NJ 248 MA" ], "locale_variants": {} }, { "sku": "NJ252-MA", "brand": "SKF", "manufacturer_designation": "SKF NJ 252 MA", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 260, "D_mm": 480, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 1170, "static_load_kN": 1700, "fatigue_load_limit_kN": 150, "max_rpm": 2000, "reference_speed_rpm": 1400, "limiting_speed_rpm": 2000, "weight_g": 69000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJ 252 MA denotes a single-row caged cylindrical roller bearing on the ISO 15 260×480×80 mm envelope, dimension series 2 (light-section ISO 15 envelope), with catalogue mass 69000 g. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. The one-piece machined brass cage is reflected in the published speeds and temperature limits. With C 1170 kN and C0 1700 kN, size the bearing on the 260×480 mm ISO 15 envelope and check the 150 kN Pu against the equivalent-load floor; the catalogue lists 1,400 r/min thermal reference speed and 2,000 r/min mechanical limiting speed. Fit practice for NJ252-MA: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "heavy turbogenerator rotor supports", "mining hoist and winder shafts", "offshore drawworks shafts", "large rolling-mill drive trains" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 252, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 252 MA and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 80 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 1170/1700 kN ratings are SKF catalogue 17000 (2018) values for the MA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ252-MA?", "a": "SKF NJ 252 MA is a single-row caged cylindrical roller bearing with 260 mm bore, 480 mm OD and 80 mm width per ISO 15. SKF lists C 1170 kN, C0 1700 kN, Pu 150 kN, reference speed 1,400 r/min and limiting speed 2,000 r/min, mass about 69000 g." }, { "q": "What does the NJ designation and MA suffix mean?", "a": "The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ252-MA take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ252-MA compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ252", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "NU252-MA", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 260×480×80 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP252-MA", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 260×480×80 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ252-MA", "SKF NJ 252 MA" ], "locale_variants": {} }, { "sku": "NJ256-MA", "brand": "SKF", "manufacturer_designation": "SKF NJ 256 MA", "series": "NJ200-series", "type": "cylindrical_roller", "d_mm": 280, "D_mm": 500, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 1140, "static_load_kN": 1800, "fatigue_load_limit_kN": 156, "max_rpm": 1900, "reference_speed_rpm": 1400, "limiting_speed_rpm": 1900, "weight_g": 73000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NJ 256 MA is a single-row caged cylindrical roller bearing sized 280×500×80 mm — a dimension series 2 (light-section ISO 15 envelope), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix MA: the basic (non-E) MA execution with a machined brass cage, standard for the larger and earlier-design sizes. The radial section height is 110.0 mm and the catalogue mass 73000 g; at 1140 kN dynamic rating this is roughly 4.07 kN of C per millimetre of bore before application factors. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 280 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "marine propulsion line shafts", "heavy turbogenerator rotor supports", "mining hoist and winder shafts", "offshore drawworks shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 2 (light-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 256, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 256 MA and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 80 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 1140/1800 kN ratings are SKF catalogue 17000 (2018) values for the MA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ256-MA?", "a": "SKF NJ 256 MA is a single-row caged cylindrical roller bearing with 280 mm bore, 500 mm OD and 80 mm width per ISO 15. SKF lists C 1140 kN, C0 1800 kN, Pu 156 kN, reference speed 1,400 r/min and limiting speed 1,900 r/min, mass about 73000 g." }, { "q": "What does the NJ designation and MA suffix mean?", "a": "The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ256-MA take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ256-MA compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ256", "equiv_brand": "NTN", "level": "partial", "note": "Same 280×500×80 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU256-MA", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 280×500×80 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ256-MA", "SKF NJ 256 MA" ], "locale_variants": {} }, { "sku": "NJ28-710-ECMA", "brand": "SKF", "manufacturer_designation": "SKF NJ 28/710 ECMA", "series": "NJ2800-series", "type": "cylindrical_roller", "d_mm": 710, "D_mm": 870, "B_mm": 95, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 1940, "static_load_kN": 5000, "fatigue_load_limit_kN": 375, "max_rpm": 850, "reference_speed_rpm": 630, "limiting_speed_rpm": 850, "weight_g": 130000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 710 mm shaft, SKF lists NJ28-710-ECMA as single-row caged cylindrical roller: 870 mm OD, 95 mm wide, Pu 375 kN, the catalogue lists 630 r/min thermal reference speed and 850 r/min mechanical limiting speed. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECMA: the E-design ECMA execution with a one-piece machined brass cage for higher-temperature, higher-speed continuous duty. The radial section height is 80.0 mm and the catalogue mass 130000 g; at 1940 kN dynamic rating this is roughly 2.73 kN of C per millimetre of bore before application factors. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 710 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "marine propulsion line shafts", "heavy turbogenerator rotor supports", "mining hoist and winder shafts", "offshore drawworks shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 28 (slim section, wide) envelope is shared with the N/NU/NJ/NUP executions of 28/710, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 28/710 ECMA and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 1940/5000 kN ratings are SKF catalogue 17000 (2018) values for the ECMA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ28-710-ECMA?", "a": "SKF NJ 28/710 ECMA is a single-row caged cylindrical roller bearing with 710 mm bore, 870 mm OD and 95 mm width per ISO 15. SKF lists C 1940 kN, C0 5000 kN, Pu 375 kN, reference speed 630 r/min and limiting speed 850 r/min, mass about 130000 g." }, { "q": "What does the NJ designation and ECMA suffix mean?", "a": "The ECMA suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ28-710-ECMA take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ28-710-ECMA compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ28", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ28-710-ECMA", "SKF NJ 28/710 ECMA" ], "locale_variants": {} }, { "sku": "NJ2892-ECMA", "brand": "SKF", "manufacturer_designation": "SKF NJ 2892 ECMA", "series": "NJ2800-series", "type": "cylindrical_roller", "d_mm": 460, "D_mm": 580, "B_mm": 72, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 1080, "static_load_kN": 2400, "fatigue_load_limit_kN": 193, "max_rpm": 1400, "reference_speed_rpm": 1100, "limiting_speed_rpm": 1400, "weight_g": 48000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NJ 2892 ECMA is a single-row caged cylindrical roller bearing sized 460×580×72 mm — a dimension series 28 (slim section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECMA: the E-design ECMA execution with a one-piece machined brass cage for higher-temperature, higher-speed continuous duty. The radial section height is 60.0 mm and the catalogue mass 48000 g; at 1080 kN dynamic rating this is roughly 2.35 kN of C per millimetre of bore before application factors. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C.", "applications": [ "marine propulsion line shafts", "heavy turbogenerator rotor supports", "mining hoist and winder shafts", "offshore drawworks shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 28 (slim section, wide) envelope is shared with the N/NU/NJ/NUP executions of 2892, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2892 ECMA and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 580 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 72 mm-wide ring and concentrates load.", "The 1080/2400 kN ratings are SKF catalogue 17000 (2018) values for the ECMA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2892-ECMA?", "a": "SKF NJ 2892 ECMA is a single-row caged cylindrical roller bearing with 460 mm bore, 580 mm OD and 72 mm width per ISO 15. SKF lists C 1080 kN, C0 2400 kN, Pu 193 kN, reference speed 1,100 r/min and limiting speed 1,400 r/min, mass about 48000 g." }, { "q": "What does the NJ designation and ECMA suffix mean?", "a": "The ECMA suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2892-ECMA take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2892-ECMA compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ2892", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2892-ECMA", "SKF NJ 2892 ECMA" ], "locale_variants": {} }, { "sku": "NJ29-630-ECMA-HB1", "brand": "SKF", "manufacturer_designation": "SKF NJ 29/630 ECMA/HB1", "series": "NJ2900-series", "type": "cylindrical_roller", "d_mm": 630, "D_mm": 850, "B_mm": 128, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 3300, "static_load_kN": 7200, "fatigue_load_limit_kN": 510, "max_rpm": 900, "reference_speed_rpm": 700, "limiting_speed_rpm": 900, "weight_g": 230000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NJ 29/630 ECMA/HB1 is a single-row caged cylindrical roller bearing sized 630×850×128 mm — a dimension series 29 (compact OD, normal width), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The plain designation (no cage suffix) identifies the basic execution supplied with a standard pressed-steel cage. The one-piece machined brass cage is reflected in the published speeds and temperature limits. Speed planning for NJ29-630-ECMA-HB1: the catalogue lists 700 r/min thermal reference speed and 900 r/min mechanical limiting speed. The mass entry 230000 g covers the complete catalogue execution. Fit practice for NJ29-630-ECMA-HB1: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "mining hoist and winder shafts", "offshore drawworks shafts", "large rolling-mill drive trains", "marine propulsion line shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 29 (compact OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 29/630, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 29/630 ECMA/HB1 and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 3300/7200 kN ratings are SKF catalogue 17000 (2018) values for the ECMA/HB1 execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ29-630-ECMA-HB1?", "a": "SKF NJ 29/630 ECMA/HB1 is a single-row caged cylindrical roller bearing with 630 mm bore, 850 mm OD and 128 mm width per ISO 15. SKF lists C 3300 kN, C0 7200 kN, Pu 510 kN, reference speed 700 r/min and limiting speed 900 r/min, mass about 230000 g." }, { "q": "What does the NJ designation and ECMA/HB1 suffix mean?", "a": "The plain designation (no cage suffix) identifies the basic execution supplied with a standard pressed-steel cage. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ29-630-ECMA-HB1 take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ29-630-ECMA-HB1 compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU29-630-ECMA-HB1", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 630×850×128 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ29-630-ECMA-HB1", "SKF NJ 29/630 ECMA/HB1" ], "locale_variants": {} }, { "sku": "NJ2968-ECMA", "brand": "SKF", "manufacturer_designation": "SKF NJ 2968 ECMA", "series": "NJ2900-series", "type": "cylindrical_roller", "d_mm": 340, "D_mm": 460, "B_mm": 72, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 1020, "static_load_kN": 2040, "fatigue_load_limit_kN": 186, "max_rpm": 1900, "reference_speed_rpm": 1400, "limiting_speed_rpm": 1900, "weight_g": 37000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 340 mm shaft, SKF lists NJ2968-ECMA as single-row caged cylindrical roller: 460 mm OD, 72 mm wide, Pu 186 kN, the catalogue lists 1,400 r/min thermal reference speed and 1,900 r/min mechanical limiting speed. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECMA suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. The one-piece machined brass cage is reflected in the published speeds and temperature limits. The radial section height is 60.0 mm and the catalogue mass 37000 g; at 1020 kN dynamic rating this is roughly 3.00 kN of C per millimetre of bore before application factors. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 340 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "marine propulsion line shafts", "heavy turbogenerator rotor supports", "mining hoist and winder shafts", "offshore drawworks shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 29 (compact OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 2968, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2968 ECMA and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 72 mm-wide ring and concentrates load.", "The 1020/2040 kN ratings are SKF catalogue 17000 (2018) values for the ECMA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2968-ECMA?", "a": "SKF NJ 2968 ECMA is a single-row caged cylindrical roller bearing with 340 mm bore, 460 mm OD and 72 mm width per ISO 15. SKF lists C 1020 kN, C0 2040 kN, Pu 186 kN, reference speed 1,400 r/min and limiting speed 1,900 r/min, mass about 37000 g." }, { "q": "What does the NJ designation and ECMA suffix mean?", "a": "The ECMA suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2968-ECMA take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2968-ECMA compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ2968", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2968-ECMA", "SKF NJ 2968 ECMA" ], "locale_variants": {} }, { "sku": "NJ2980-ECMA", "brand": "SKF", "manufacturer_designation": "SKF NJ 2980 ECMA", "series": "NJ2900-series", "type": "cylindrical_roller", "d_mm": 400, "D_mm": 540, "B_mm": 82, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 1380, "static_load_kN": 2800, "fatigue_load_limit_kN": 245, "max_rpm": 1600, "reference_speed_rpm": 1200, "limiting_speed_rpm": 1600, "weight_g": 57000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NJ 2980 ECMA resolves to a 400×540×82 mm single-row caged cylindrical roller bearing (dimension series 29 (compact OD, normal width)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECMA: the E-design ECMA execution with a one-piece machined brass cage for higher-temperature, higher-speed continuous duty. Speed planning for NJ2980-ECMA: the catalogue lists 1,200 r/min thermal reference speed and 1,600 r/min mechanical limiting speed. The mass entry 57000 g covers the complete catalogue execution. Fit practice for NJ2980-ECMA: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "mining hoist and winder shafts", "offshore drawworks shafts", "large rolling-mill drive trains", "marine propulsion line shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 29 (compact OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 2980, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2980 ECMA and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 540 mm raceway.", "The 1380/2800 kN ratings are SKF catalogue 17000 (2018) values for the ECMA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2980-ECMA?", "a": "SKF NJ 2980 ECMA is a single-row caged cylindrical roller bearing with 400 mm bore, 540 mm OD and 82 mm width per ISO 15. SKF lists C 1380 kN, C0 2800 kN, Pu 245 kN, reference speed 1,200 r/min and limiting speed 1,600 r/min, mass about 57000 g." }, { "q": "What does the NJ designation and ECMA suffix mean?", "a": "The ECMA suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2980-ECMA take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2980-ECMA compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ2980", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2980-ECMA", "SKF NJ 2980 ECMA" ], "locale_variants": {} }, { "sku": "NJ2988-ECML", "brand": "SKF", "manufacturer_designation": "SKF NJ 2988 ECML", "series": "NJ2900-series", "type": "cylindrical_roller", "d_mm": 440, "D_mm": 600, "B_mm": 95, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 1870, "static_load_kN": 3900, "fatigue_load_limit_kN": 340, "max_rpm": 1600, "reference_speed_rpm": 1100, "limiting_speed_rpm": 1600, "weight_g": 83000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 440 mm shaft, SKF lists NJ2988-ECML as single-row caged cylindrical roller: 600 mm OD, 95 mm wide, Pu 340 kN, the catalogue lists 1,100 r/min thermal reference speed and 1,600 r/min mechanical limiting speed. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Load-per-bore for the 440 mm seat is about 4.25 kN/mm, typical of dimension series 29 (compact OD, normal width); use C0 3900 kN for static checks such as crane hook blocks standing under load. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 440 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "offshore drawworks shafts", "large rolling-mill drive trains", "marine propulsion line shafts", "heavy turbogenerator rotor supports" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 29 (compact OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 2988, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2988 ECML and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 95 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 600 mm raceway.", "The 1870/3900 kN ratings are SKF catalogue 17000 (2018) values for the ECML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2988-ECML?", "a": "SKF NJ 2988 ECML is a single-row caged cylindrical roller bearing with 440 mm bore, 600 mm OD and 95 mm width per ISO 15. SKF lists C 1870 kN, C0 3900 kN, Pu 340 kN, reference speed 1,100 r/min and limiting speed 1,600 r/min, mass about 83000 g." }, { "q": "What does the NJ designation and ECML suffix mean?", "a": "The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2988-ECML take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2988-ECML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU2988-ECML", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 440×600×95 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2988-ECML", "SKF NJ 2988 ECML" ], "locale_variants": {} }, { "sku": "NJ2992-ECMA", "brand": "SKF", "manufacturer_designation": "SKF NJ 2992 ECMA", "series": "NJ2900-series", "type": "cylindrical_roller", "d_mm": 460, "D_mm": 620, "B_mm": 95, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 1720, "static_load_kN": 3600, "fatigue_load_limit_kN": 310, "max_rpm": 1300, "reference_speed_rpm": 1000, "limiting_speed_rpm": 1300, "weight_g": 89000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ2992-ECMA is the 460 mm bore entry in the NJ2900 range: a 460×620×95 mm single-row caged cylindrical roller bearing with a one-piece machined brass cage, rated C 1720 kN / C0 3600 kN. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECMA suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. With C 1720 kN and C0 3600 kN, size the bearing on the 460×620 mm ISO 15 envelope and check the 310 kN Pu against the equivalent-load floor; the catalogue lists 1,000 r/min thermal reference speed and 1,300 r/min mechanical limiting speed. Fit practice for NJ2992-ECMA: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "heavy turbogenerator rotor supports", "mining hoist and winder shafts", "offshore drawworks shafts", "large rolling-mill drive trains" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 29 (compact OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 2992, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 2992 ECMA and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 620 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 95 mm-wide ring and concentrates load.", "The 1720/3600 kN ratings are SKF catalogue 17000 (2018) values for the ECMA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ2992-ECMA?", "a": "SKF NJ 2992 ECMA is a single-row caged cylindrical roller bearing with 460 mm bore, 620 mm OD and 95 mm width per ISO 15. SKF lists C 1720 kN, C0 3600 kN, Pu 310 kN, reference speed 1,000 r/min and limiting speed 1,300 r/min, mass about 89000 g." }, { "q": "What does the NJ designation and ECMA suffix mean?", "a": "The ECMA suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ2992-ECMA take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ2992-ECMA compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ2992", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ2992-ECMA", "SKF NJ 2992 ECMA" ], "locale_variants": {} }, { "sku": "NJ303-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 303 ECP", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 17, "D_mm": 47, "B_mm": 14, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 28.5, "static_load_kN": 20.4, "fatigue_load_limit_kN": 2.55, "max_rpm": 20000, "reference_speed_rpm": 17000, "limiting_speed_rpm": 20000, "weight_g": 120, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJ 303 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 17×47×14 mm envelope, dimension series 3 (medium-section ISO 15 envelope), with catalogue mass 120 g. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. With C 28.5 kN and C0 20.4 kN, size the bearing on the 17×47 mm ISO 15 envelope and check the 2.55 kN Pu against the equivalent-load floor; the catalogue lists 17,000 r/min thermal reference speed and 20,000 r/min mechanical limiting speed. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.", "applications": [ "motor-cycle and small-engine transmissions", "appliance and fan armature shafts", "small pump rotor shafts", "small industrial electric-motor shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 303, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 303 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 47 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 14 mm-wide ring and concentrates load.", "The 28.5/20.4 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ303-ECP?", "a": "SKF NJ 303 ECP is a single-row caged cylindrical roller bearing with 17 mm bore, 47 mm OD and 14 mm width per ISO 15. SKF lists C 28.5 kN, C0 20.4 kN, Pu 2.55 kN, reference speed 17,000 r/min and limiting speed 20,000 r/min, mass about 120 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ303-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ303-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "N303-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 17×47×14 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU303-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 17×47×14 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ303-ECP", "SKF NJ 303 ECP" ], "locale_variants": {} }, { "sku": "NJ304-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 304 ECP", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 20, "D_mm": 52, "B_mm": 15, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 35.5, "static_load_kN": 26, "fatigue_load_limit_kN": 3.25, "max_rpm": 18000, "reference_speed_rpm": 15000, "limiting_speed_rpm": 18000, "weight_g": 150, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJ 304 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 20×52×15 mm envelope, dimension series 3 (medium-section ISO 15 envelope), with catalogue mass 150 g. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. Speed planning for NJ304-ECP: the catalogue lists 15,000 r/min thermal reference speed and 18,000 r/min mechanical limiting speed. The mass entry 150 g covers the complete catalogue execution. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 20 mm seat normally takes a k5 interference with an H7 housing bore when the inner ring rotates.", "applications": [ "appliance and fan armature shafts", "small pump rotor shafts", "small industrial electric-motor shafts", "light gearbox layshafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 304, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 304 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 15 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 15 mm-wide ring and concentrates load.", "The 35.5/26 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ304-ECP?", "a": "SKF NJ 304 ECP is a single-row caged cylindrical roller bearing with 20 mm bore, 52 mm OD and 15 mm width per ISO 15. SKF lists C 35.5 kN, C0 26 kN, Pu 3.25 kN, reference speed 15,000 r/min and limiting speed 18,000 r/min, mass about 150 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ304-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ304-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "N304-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 20×52×15 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP304-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 20×52×15 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU304", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 20×52×15 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ304-ECP", "SKF NJ 304 ECP" ], "locale_variants": {} }, { "sku": "NJ305-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 305 ECP", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 25, "D_mm": 62, "B_mm": 17, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 46.5, "static_load_kN": 36.5, "fatigue_load_limit_kN": 4.55, "max_rpm": 15000, "reference_speed_rpm": 12000, "limiting_speed_rpm": 15000, "weight_g": 240, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NJ 305 ECP resolves to a 25×62×17 mm single-row caged cylindrical roller bearing (dimension series 3 (medium-section ISO 15 envelope)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Load-per-bore for the 25 mm seat is about 1.86 kN/mm, typical of dimension series 3 (medium-section ISO 15 envelope); use C0 36.5 kN for static checks such as crane hook blocks standing under load. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.", "applications": [ "small pump rotor shafts", "small industrial electric-motor shafts", "light gearbox layshafts", "motor-cycle and small-engine transmissions" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 305, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 305 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 17 mm-wide ring and concentrates load.", "The 46.5/36.5 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ305-ECP?", "a": "SKF NJ 305 ECP is a single-row caged cylindrical roller bearing with 25 mm bore, 62 mm OD and 17 mm width per ISO 15. SKF lists C 46.5 kN, C0 36.5 kN, Pu 4.55 kN, reference speed 12,000 r/min and limiting speed 15,000 r/min, mass about 240 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ305-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ305-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "N305-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 25×62×17 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP305-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 25×62×17 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU305", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 25×62×17 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ305-ECP", "SKF NJ 305 ECP" ], "locale_variants": {} }, { "sku": "NJ306-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 306 ECP", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 30, "D_mm": 72, "B_mm": 19, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 58.5, "static_load_kN": 48, "fatigue_load_limit_kN": 6.2, "max_rpm": 12000, "reference_speed_rpm": 11000, "limiting_speed_rpm": 12000, "weight_g": 370, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ306-ECP is the 30 mm bore entry in the NJ300 range: a 30×72×19 mm single-row caged cylindrical roller bearing with a glass-fibre reinforced polyamide (PA66) window-type cage, rated C 58.5 kN / C0 48 kN. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Selection arithmetic: C0/C ≈ 0.82 (48 against 58.5 kN), and the Pu figure 6.2 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 11,000 r/min thermal reference speed and 12,000 r/min mechanical limiting speed. Fit practice for NJ306-ECP: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "medium industrial gearbox shafts", "electric-motor shafts in pumps and fans", "compressor crank and rotor shafts", "machine-tool radial spindle supports" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 306, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 306 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 72 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 19 mm-wide ring and concentrates load.", "The 58.5/48 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ306-ECP?", "a": "SKF NJ 306 ECP is a single-row caged cylindrical roller bearing with 30 mm bore, 72 mm OD and 19 mm width per ISO 15. SKF lists C 58.5 kN, C0 48 kN, Pu 6.2 kN, reference speed 11,000 r/min and limiting speed 12,000 r/min, mass about 370 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ306-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ306-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "N306-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 30×72×19 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP306-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 30×72×19 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU306", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 30×72×19 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ306-ECP", "SKF NJ 306 ECP" ], "locale_variants": {} }, { "sku": "NJ307-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 307 ECP", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 35, "D_mm": 80, "B_mm": 21, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 75, "static_load_kN": 63, "fatigue_load_limit_kN": 8.15, "max_rpm": 11000, "reference_speed_rpm": 9500, "limiting_speed_rpm": 11000, "weight_g": 490, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ307-ECP is the 35 mm bore entry in the NJ300 range: a 35×80×21 mm single-row caged cylindrical roller bearing with a glass-fibre reinforced polyamide (PA66) window-type cage, rated C 75 kN / C0 63 kN. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The radial section height is 22.5 mm and the catalogue mass 490 g; at 75 kN dynamic rating this is roughly 2.14 kN of C per millimetre of bore before application factors. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.", "applications": [ "electric-motor shafts in pumps and fans", "compressor crank and rotor shafts", "machine-tool radial spindle supports", "conveyor drive-pulley shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 307, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 307 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 21 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 21 mm-wide ring and concentrates load.", "The 75/63 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ307-ECP?", "a": "SKF NJ 307 ECP is a single-row caged cylindrical roller bearing with 35 mm bore, 80 mm OD and 21 mm width per ISO 15. SKF lists C 75 kN, C0 63 kN, Pu 8.15 kN, reference speed 9,500 r/min and limiting speed 11,000 r/min, mass about 490 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ307-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ307-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "N307-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 35×80×21 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP307-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 35×80×21 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU307", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 35×80×21 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ307-ECP", "SKF NJ 307 ECP" ], "locale_variants": {} }, { "sku": "NJ308-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 308 ECP", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 90, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 93, "static_load_kN": 78, "fatigue_load_limit_kN": 10.2, "max_rpm": 9500, "reference_speed_rpm": 8000, "limiting_speed_rpm": 9500, "weight_g": 670, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 40 mm shaft, SKF lists NJ308-ECP as single-row caged cylindrical roller: 90 mm OD, 23 mm wide, Pu 10.2 kN, the catalogue lists 8,000 r/min thermal reference speed and 9,500 r/min mechanical limiting speed. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Speed planning for NJ308-ECP: the catalogue lists 8,000 r/min thermal reference speed and 9,500 r/min mechanical limiting speed. The mass entry 670 g covers the complete catalogue execution. Fit practice for NJ308-ECP: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "machine-tool radial spindle supports", "conveyor drive-pulley shafts", "medium industrial gearbox shafts", "electric-motor shafts in pumps and fans" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 308, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 308 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 90 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 23 mm-wide ring and concentrates load.", "The 93/78 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ308-ECP?", "a": "SKF NJ 308 ECP is a single-row caged cylindrical roller bearing with 40 mm bore, 90 mm OD and 23 mm width per ISO 15. SKF lists C 93 kN, C0 78 kN, Pu 10.2 kN, reference speed 8,000 r/min and limiting speed 9,500 r/min, mass about 670 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ308-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ308-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ308", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×90×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "N308-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 40×90×23 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP308-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 40×90×23 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU308", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 40×90×23 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ308-ECP", "SKF NJ 308 ECP" ], "locale_variants": {} }, { "sku": "NJ309-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 309 ECP", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 100, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 112, "static_load_kN": 100, "fatigue_load_limit_kN": 12.9, "max_rpm": 8500, "reference_speed_rpm": 7500, "limiting_speed_rpm": 8500, "weight_g": 890, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 45 mm shaft, SKF lists NJ309-ECP as single-row caged cylindrical roller: 100 mm OD, 25 mm wide, Pu 12.9 kN, the catalogue lists 7,500 r/min thermal reference speed and 8,500 r/min mechanical limiting speed. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Load-per-bore for the 45 mm seat is about 2.49 kN/mm, typical of dimension series 3 (medium-section ISO 15 envelope); use C0 100 kN for static checks such as crane hook blocks standing under load. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.", "applications": [ "conveyor drive-pulley shafts", "medium industrial gearbox shafts", "electric-motor shafts in pumps and fans", "compressor crank and rotor shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 309, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 309 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 25 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 25 mm-wide ring and concentrates load.", "The 112/100 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ309-ECP?", "a": "SKF NJ 309 ECP is a single-row caged cylindrical roller bearing with 45 mm bore, 100 mm OD and 25 mm width per ISO 15. SKF lists C 112 kN, C0 100 kN, Pu 12.9 kN, reference speed 7,500 r/min and limiting speed 8,500 r/min, mass about 890 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ309-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ309-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ309", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×100×25 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "N309-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 45×100×25 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP309-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 45×100×25 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU309", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 45×100×25 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ309-ECP", "SKF NJ 309 ECP" ], "locale_variants": {} }, { "sku": "NJ310-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 310 ECP", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 110, "B_mm": 27, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 127, "static_load_kN": 112, "fatigue_load_limit_kN": 15, "max_rpm": 8000, "reference_speed_rpm": 6700, "limiting_speed_rpm": 8000, "weight_g": 1150, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ310-ECP is the 50 mm bore entry in the NJ300 range: a 50×110×27 mm single-row caged cylindrical roller bearing with a glass-fibre reinforced polyamide (PA66) window-type cage, rated C 127 kN / C0 112 kN. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Load-per-bore for the 50 mm seat is about 2.54 kN/mm, typical of dimension series 3 (medium-section ISO 15 envelope); use C0 112 kN for static checks such as crane hook blocks standing under load. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 50 mm seat normally takes a k5 interference with an H7 housing bore when the inner ring rotates.", "applications": [ "conveyor drive-pulley shafts", "medium industrial gearbox shafts", "electric-motor shafts in pumps and fans", "compressor crank and rotor shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 310, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 310 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 110 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 110 mm raceway.", "The 127/112 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ310-ECP?", "a": "SKF NJ 310 ECP is a single-row caged cylindrical roller bearing with 50 mm bore, 110 mm OD and 27 mm width per ISO 15. SKF lists C 127 kN, C0 112 kN, Pu 15 kN, reference speed 6,700 r/min and limiting speed 8,000 r/min, mass about 1150 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ310-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ310-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ310", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×110×27 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "N310-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 50×110×27 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP310-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 50×110×27 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU310", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 50×110×27 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ310-ECP", "SKF NJ 310 ECP" ], "locale_variants": {} }, { "sku": "NJ311-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 311 ECP", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 120, "B_mm": 29, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 156, "static_load_kN": 143, "fatigue_load_limit_kN": 18.6, "max_rpm": 7000, "reference_speed_rpm": 6000, "limiting_speed_rpm": 7000, "weight_g": 1500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ311-ECP is the 55 mm bore entry in the NJ300 range: a 55×120×29 mm single-row caged cylindrical roller bearing with a glass-fibre reinforced polyamide (PA66) window-type cage, rated C 156 kN / C0 143 kN. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Selection arithmetic: C0/C ≈ 0.92 (143 against 156 kN), and the Pu figure 18.6 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 6,000 r/min thermal reference speed and 7,000 r/min mechanical limiting speed. Fit practice for NJ311-ECP: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "medium industrial gearbox shafts", "electric-motor shafts in pumps and fans", "compressor crank and rotor shafts", "machine-tool radial spindle supports" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 311, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 311 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 29 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 120 mm raceway.", "The 156/143 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ311-ECP?", "a": "SKF NJ 311 ECP is a single-row caged cylindrical roller bearing with 55 mm bore, 120 mm OD and 29 mm width per ISO 15. SKF lists C 156 kN, C0 143 kN, Pu 18.6 kN, reference speed 6,000 r/min and limiting speed 7,000 r/min, mass about 1500 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ311-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ311-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ311", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×120×29 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "N311-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 55×120×29 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP311-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 55×120×29 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU311", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 55×120×29 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ311-ECP", "SKF NJ 311 ECP" ], "locale_variants": {} }, { "sku": "NJ312-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 312 ECP", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 130, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 173, "static_load_kN": 160, "fatigue_load_limit_kN": 21.2, "max_rpm": 6700, "reference_speed_rpm": 5600, "limiting_speed_rpm": 6700, "weight_g": 1850, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 60 mm shaft, SKF lists NJ312-ECP as single-row caged cylindrical roller: 130 mm OD, 31 mm wide, Pu 21.2 kN, the catalogue lists 5,600 r/min thermal reference speed and 6,700 r/min mechanical limiting speed. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The radial section height is 35.0 mm and the catalogue mass 1850 g; at 173 kN dynamic rating this is roughly 2.88 kN of C per millimetre of bore before application factors. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 60 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "large pump and blower rotors", "rolling-mill auxiliary drive shafts", "paper-machine press rolls", "cement-plant conveyor drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 312, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 312 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 130 mm raceway.", "The 173/160 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ312-ECP?", "a": "SKF NJ 312 ECP is a single-row caged cylindrical roller bearing with 60 mm bore, 130 mm OD and 31 mm width per ISO 15. SKF lists C 173 kN, C0 160 kN, Pu 21.2 kN, reference speed 5,600 r/min and limiting speed 6,700 r/min, mass about 1850 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ312-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ312-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ312", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×130×31 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "N312-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 60×130×31 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP312-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 60×130×31 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU312", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 60×130×31 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ312-ECP", "SKF NJ 312 ECP" ], "locale_variants": {} }, { "sku": "NJ313-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 313 ECP", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 140, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 212, "static_load_kN": 196, "fatigue_load_limit_kN": 25.5, "max_rpm": 6000, "reference_speed_rpm": 5300, "limiting_speed_rpm": 6000, "weight_g": 2300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 65 mm shaft, SKF lists NJ313-ECP as single-row caged cylindrical roller: 140 mm OD, 33 mm wide, Pu 25.5 kN, the catalogue lists 5,300 r/min thermal reference speed and 6,000 r/min mechanical limiting speed. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. With C 212 kN and C0 196 kN, size the bearing on the 65×140 mm ISO 15 envelope and check the 25.5 kN Pu against the equivalent-load floor; the catalogue lists 5,300 r/min thermal reference speed and 6,000 r/min mechanical limiting speed. Fit practice for NJ313-ECP: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "rolling-mill auxiliary drive shafts", "paper-machine press rolls", "cement-plant conveyor drives", "heavy gearbox and pinion shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 313, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 313 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 140 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 140 mm raceway.", "The 212/196 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ313-ECP?", "a": "SKF NJ 313 ECP is a single-row caged cylindrical roller bearing with 65 mm bore, 140 mm OD and 33 mm width per ISO 15. SKF lists C 212 kN, C0 196 kN, Pu 25.5 kN, reference speed 5,300 r/min and limiting speed 6,000 r/min, mass about 2300 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ313-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ313-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ313", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×140×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "N313-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 65×140×33 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP313-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 65×140×33 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU313", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 65×140×33 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ313-ECP", "SKF NJ 313 ECP" ], "locale_variants": {} }, { "sku": "NJ314-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 314 ECP", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 150, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 236, "static_load_kN": 228, "fatigue_load_limit_kN": 29, "max_rpm": 5600, "reference_speed_rpm": 4800, "limiting_speed_rpm": 5600, "weight_g": 2750, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NJ 314 ECP is a single-row caged cylindrical roller bearing sized 70×150×35 mm — a dimension series 3 (medium-section ISO 15 envelope), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Load-per-bore for the 70 mm seat is about 3.37 kN/mm, typical of dimension series 3 (medium-section ISO 15 envelope); use C0 228 kN for static checks such as crane hook blocks standing under load. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 70 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "cement-plant conveyor drives", "heavy gearbox and pinion shafts", "large pump and blower rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 314, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 314 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 150 mm raceway.", "The 236/228 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ314-ECP?", "a": "SKF NJ 314 ECP is a single-row caged cylindrical roller bearing with 70 mm bore, 150 mm OD and 35 mm width per ISO 15. SKF lists C 236 kN, C0 228 kN, Pu 29 kN, reference speed 4,800 r/min and limiting speed 5,600 r/min, mass about 2750 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ314-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ314-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ314", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×150×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "N314-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 70×150×35 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP314-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 70×150×35 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU314", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 70×150×35 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ314-ECP", "SKF NJ 314 ECP" ], "locale_variants": {} }, { "sku": "NJ315-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 315 ECP", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 160, "B_mm": 37, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 280, "static_load_kN": 265, "fatigue_load_limit_kN": 33.5, "max_rpm": 5300, "reference_speed_rpm": 4500, "limiting_speed_rpm": 5300, "weight_g": 3350, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJ 315 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 75×160×37 mm envelope, dimension series 3 (medium-section ISO 15 envelope), with catalogue mass 3350 g. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 0.95 (265 against 280 kN), and the Pu figure 33.5 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 4,500 r/min thermal reference speed and 5,300 r/min mechanical limiting speed. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.", "applications": [ "heavy gearbox and pinion shafts", "large pump and blower rotors", "rolling-mill auxiliary drive shafts", "paper-machine press rolls" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 315, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 315 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 160 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 160 mm raceway.", "The 280/265 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ315-ECP?", "a": "SKF NJ 315 ECP is a single-row caged cylindrical roller bearing with 75 mm bore, 160 mm OD and 37 mm width per ISO 15. SKF lists C 280 kN, C0 265 kN, Pu 33.5 kN, reference speed 4,500 r/min and limiting speed 5,300 r/min, mass about 3350 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ315-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ315-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ315", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×160×37 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "N315-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 75×160×37 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP315-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 75×160×37 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU315", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 75×160×37 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ315-ECP", "SKF NJ 315 ECP" ], "locale_variants": {} }, { "sku": "NJ316-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 316 ECP", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 170, "B_mm": 39, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 300, "static_load_kN": 290, "fatigue_load_limit_kN": 36, "max_rpm": 5000, "reference_speed_rpm": 4300, "limiting_speed_rpm": 5000, "weight_g": 4000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJ 316 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 80×170×39 mm envelope, dimension series 3 (medium-section ISO 15 envelope), with catalogue mass 4000 g. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The radial section height is 45.0 mm and the catalogue mass 4000 g; at 300 kN dynamic rating this is roughly 3.75 kN of C per millimetre of bore before application factors. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 80 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "large pump and blower rotors", "rolling-mill auxiliary drive shafts", "paper-machine press rolls", "cement-plant conveyor drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 316, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 316 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 39 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 170 mm raceway.", "The 300/290 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ316-ECP?", "a": "SKF NJ 316 ECP is a single-row caged cylindrical roller bearing with 80 mm bore, 170 mm OD and 39 mm width per ISO 15. SKF lists C 300 kN, C0 290 kN, Pu 36 kN, reference speed 4,300 r/min and limiting speed 5,000 r/min, mass about 4000 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ316-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ316-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ316", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×170×39 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "N316-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 80×170×39 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP316-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 80×170×39 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU316", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 80×170×39 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ316-ECP", "SKF NJ 316 ECP" ], "locale_variants": {} }, { "sku": "NJ317-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 317 ECP", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 180, "B_mm": 41, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 340, "static_load_kN": 335, "fatigue_load_limit_kN": 41.5, "max_rpm": 4800, "reference_speed_rpm": 4000, "limiting_speed_rpm": 4800, "weight_g": 4800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NJ 317 ECP resolves to a 85×180×41 mm single-row caged cylindrical roller bearing (dimension series 3 (medium-section ISO 15 envelope)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. With C 340 kN and C0 335 kN, size the bearing on the 85×180 mm ISO 15 envelope and check the 41.5 kN Pu against the equivalent-load floor; the catalogue lists 4,000 r/min thermal reference speed and 4,800 r/min mechanical limiting speed. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.", "applications": [ "rolling-mill auxiliary drive shafts", "paper-machine press rolls", "cement-plant conveyor drives", "heavy gearbox and pinion shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 317, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 317 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 180 mm raceway.", "The 340/335 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ317-ECP?", "a": "SKF NJ 317 ECP is a single-row caged cylindrical roller bearing with 85 mm bore, 180 mm OD and 41 mm width per ISO 15. SKF lists C 340 kN, C0 335 kN, Pu 41.5 kN, reference speed 4,000 r/min and limiting speed 4,800 r/min, mass about 4800 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ317-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ317-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ317", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×180×41 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "N317-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 85×180×41 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP317-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 85×180×41 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU317", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 85×180×41 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ317-ECP", "SKF NJ 317 ECP" ], "locale_variants": {} }, { "sku": "NJ318-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 318 ECP", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 190, "B_mm": 43, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 365, "static_load_kN": 360, "fatigue_load_limit_kN": 43, "max_rpm": 4500, "reference_speed_rpm": 3800, "limiting_speed_rpm": 4500, "weight_g": 5450, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NJ 318 ECP resolves to a 90×190×43 mm single-row caged cylindrical roller bearing (dimension series 3 (medium-section ISO 15 envelope)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Speed planning for NJ318-ECP: the catalogue lists 3,800 r/min thermal reference speed and 4,500 r/min mechanical limiting speed. The mass entry 5450 g covers the complete catalogue execution. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 90 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "paper-machine press rolls", "cement-plant conveyor drives", "heavy gearbox and pinion shafts", "large pump and blower rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 318, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 318 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 190 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 190 mm raceway.", "The 365/360 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ318-ECP?", "a": "SKF NJ 318 ECP is a single-row caged cylindrical roller bearing with 90 mm bore, 190 mm OD and 43 mm width per ISO 15. SKF lists C 365 kN, C0 360 kN, Pu 43 kN, reference speed 3,800 r/min and limiting speed 4,500 r/min, mass about 5450 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ318-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ318-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ318", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×190×43 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "N318-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 90×190×43 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP318-ECJ", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 90×190×43 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU318", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 90×190×43 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ318-ECP", "SKF NJ 318 ECP" ], "locale_variants": {} }, { "sku": "NJ319-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 319 ECP", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 95, "D_mm": 200, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 390, "static_load_kN": 390, "fatigue_load_limit_kN": 46.5, "max_rpm": 4300, "reference_speed_rpm": 3600, "limiting_speed_rpm": 4300, "weight_g": 6300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ319-ECP is the 95 mm bore entry in the NJ300 range: a 95×200×45 mm single-row caged cylindrical roller bearing with a glass-fibre reinforced polyamide (PA66) window-type cage, rated C 390 kN / C0 390 kN. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. Load-per-bore for the 95 mm seat is about 4.11 kN/mm, typical of dimension series 3 (medium-section ISO 15 envelope); use C0 390 kN for static checks such as crane hook blocks standing under load. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.", "applications": [ "cement-plant conveyor drives", "heavy gearbox and pinion shafts", "large pump and blower rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 319, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 319 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 45 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 200 mm raceway.", "The 390/390 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ319-ECP?", "a": "SKF NJ 319 ECP is a single-row caged cylindrical roller bearing with 95 mm bore, 200 mm OD and 45 mm width per ISO 15. SKF lists C 390 kN, C0 390 kN, Pu 46.5 kN, reference speed 3,600 r/min and limiting speed 4,300 r/min, mass about 6300 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ319-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ319-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ319", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×200×45 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "N319-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 95×200×45 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP319-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 95×200×45 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU319", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 95×200×45 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ319-ECP", "SKF NJ 319 ECP" ], "locale_variants": {} }, { "sku": "NJ320-ECJ", "brand": "SKF", "manufacturer_designation": "SKF NJ 320 ECJ", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 215, "B_mm": 47, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 450, "static_load_kN": 440, "fatigue_load_limit_kN": 51, "max_rpm": 3800, "reference_speed_rpm": 3200, "limiting_speed_rpm": 3800, "weight_g": 7650, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ320-ECJ is the 100 mm bore entry in the NJ300 range: a 100×215×47 mm single-row caged cylindrical roller bearing with a pressed sheet-steel window-type cage, rated C 450 kN / C0 440 kN. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECJ suffix marks the E-design execution with a pressed sheet-steel window cage, useful where polymer cages are temperature- or lubricant-limited. The pressed sheet-steel window-type cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 0.98 (440 against 450 kN), and the Pu figure 51 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 3,200 r/min thermal reference speed and 3,800 r/min mechanical limiting speed. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 100 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "heavy gearbox and pinion shafts", "large pump and blower rotors", "rolling-mill auxiliary drive shafts", "paper-machine press rolls" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 320, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 320 ECJ and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 215 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 47 mm-wide ring and concentrates load.", "The 450/440 kN ratings are SKF catalogue 17000 (2018) values for the ECJ execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ320-ECJ?", "a": "SKF NJ 320 ECJ is a single-row caged cylindrical roller bearing with 100 mm bore, 215 mm OD and 47 mm width per ISO 15. SKF lists C 450 kN, C0 440 kN, Pu 51 kN, reference speed 3,200 r/min and limiting speed 3,800 r/min, mass about 7650 g." }, { "q": "What does the NJ designation and ECJ suffix mean?", "a": "The ECJ suffix marks the E-design execution with a pressed sheet-steel window cage, useful where polymer cages are temperature- or lubricant-limited. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ320-ECJ take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ320-ECJ compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ320", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×215×47 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "N320-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 100×215×47 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP320-ECJ", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 100×215×47 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU320", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 100×215×47 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ320-ECJ", "SKF NJ 320 ECJ" ], "locale_variants": {} }, { "sku": "NJ321-ECP", "brand": "SKF", "manufacturer_designation": "SKF NJ 321 ECP", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 105, "D_mm": 225, "B_mm": 49, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 500, "static_load_kN": 500, "fatigue_load_limit_kN": 57, "max_rpm": 3800, "reference_speed_rpm": 3200, "limiting_speed_rpm": 3800, "weight_g": 9050, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NJ 321 ECP resolves to a 105×225×49 mm single-row caged cylindrical roller bearing (dimension series 3 (medium-section ISO 15 envelope)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. With C 500 kN and C0 500 kN, size the bearing on the 105×225 mm ISO 15 envelope and check the 57 kN Pu against the equivalent-load floor; the catalogue lists 3,200 r/min thermal reference speed and 3,800 r/min mechanical limiting speed. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.", "applications": [ "rolling-mill auxiliary drive shafts", "paper-machine press rolls", "cement-plant conveyor drives", "heavy gearbox and pinion shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 321, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 321 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 49 mm-wide ring and concentrates load.", "The 500/500 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ321-ECP?", "a": "SKF NJ 321 ECP is a single-row caged cylindrical roller bearing with 105 mm bore, 225 mm OD and 49 mm width per ISO 15. SKF lists C 500 kN, C0 500 kN, Pu 57 kN, reference speed 3,200 r/min and limiting speed 3,800 r/min, mass about 9050 g." }, { "q": "What does the NJ designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ321-ECP take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ321-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ321", "equiv_brand": "NTN", "level": "partial", "note": "Same 105×225×49 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "N321-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 105×225×49 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU321-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 105×225×49 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ321-ECP", "SKF NJ 321 ECP" ], "locale_variants": {} }, { "sku": "NJ322-ECJ", "brand": "SKF", "manufacturer_designation": "SKF NJ 322 ECJ", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 240, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 530, "static_load_kN": 540, "fatigue_load_limit_kN": 61, "max_rpm": 3400, "reference_speed_rpm": 3000, "limiting_speed_rpm": 3400, "weight_g": 10500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NJ 322 ECJ is a single-row caged cylindrical roller bearing sized 110×240×50 mm — a dimension series 3 (medium-section ISO 15 envelope), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECJ suffix marks the E-design execution with a pressed sheet-steel window cage, useful where polymer cages are temperature- or lubricant-limited. Speed planning for NJ322-ECJ: the catalogue lists 3,000 r/min thermal reference speed and 3,400 r/min mechanical limiting speed. The mass entry 10500 g covers the complete catalogue execution. Fit practice for NJ322-ECJ: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "paper-machine press rolls", "cement-plant conveyor drives", "heavy gearbox and pinion shafts", "large pump and blower rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 322, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 322 ECJ and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 240 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 50 mm-wide ring and concentrates load.", "The 530/540 kN ratings are SKF catalogue 17000 (2018) values for the ECJ execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ322-ECJ?", "a": "SKF NJ 322 ECJ is a single-row caged cylindrical roller bearing with 110 mm bore, 240 mm OD and 50 mm width per ISO 15. SKF lists C 530 kN, C0 540 kN, Pu 61 kN, reference speed 3,000 r/min and limiting speed 3,400 r/min, mass about 10500 g." }, { "q": "What does the NJ designation and ECJ suffix mean?", "a": "The ECJ suffix marks the E-design execution with a pressed sheet-steel window cage, useful where polymer cages are temperature- or lubricant-limited. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ322-ECJ take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ322-ECJ compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ322", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×240×50 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "N322-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 110×240×50 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU322-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 110×240×50 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP322-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 110×240×50 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ322-ECJ", "SKF NJ 322 ECJ" ], "locale_variants": {} }, { "sku": "NJ324-ECJ", "brand": "SKF", "manufacturer_designation": "SKF NJ 324 ECJ", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 260, "B_mm": 55, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 610, "static_load_kN": 620, "fatigue_load_limit_kN": 69.5, "max_rpm": 3200, "reference_speed_rpm": 2800, "limiting_speed_rpm": 3200, "weight_g": 13500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJ 324 ECJ denotes a single-row caged cylindrical roller bearing on the ISO 15 120×260×55 mm envelope, dimension series 3 (medium-section ISO 15 envelope), with catalogue mass 13500 g. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECJ suffix marks the E-design execution with a pressed sheet-steel window cage, useful where polymer cages are temperature- or lubricant-limited. Selection arithmetic: C0/C ≈ 1.02 (620 against 610 kN), and the Pu figure 69.5 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 2,800 r/min thermal reference speed and 3,200 r/min mechanical limiting speed. Fit practice for NJ324-ECJ: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "large rolling-mill drive trains", "marine propulsion line shafts", "heavy turbogenerator rotor supports", "mining hoist and winder shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 324, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 324 ECJ and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 55 mm-wide ring and concentrates load.", "The 610/620 kN ratings are SKF catalogue 17000 (2018) values for the ECJ execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ324-ECJ?", "a": "SKF NJ 324 ECJ is a single-row caged cylindrical roller bearing with 120 mm bore, 260 mm OD and 55 mm width per ISO 15. SKF lists C 610 kN, C0 620 kN, Pu 69.5 kN, reference speed 2,800 r/min and limiting speed 3,200 r/min, mass about 13500 g." }, { "q": "What does the NJ designation and ECJ suffix mean?", "a": "The ECJ suffix marks the E-design execution with a pressed sheet-steel window cage, useful where polymer cages are temperature- or lubricant-limited. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ324-ECJ take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ324-ECJ compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ324", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×260×55 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "N324-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 120×260×55 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU324-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 120×260×55 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP324-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 120×260×55 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ324-ECJ", "SKF NJ 324 ECJ" ], "locale_variants": {} }, { "sku": "NJ326-ECJ", "brand": "SKF", "manufacturer_designation": "SKF NJ 326 ECJ", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 280, "B_mm": 58, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 720, "static_load_kN": 750, "fatigue_load_limit_kN": 81.5, "max_rpm": 3000, "reference_speed_rpm": 2400, "limiting_speed_rpm": 3000, "weight_g": 16500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NJ 326 ECJ resolves to a 130×280×58 mm single-row caged cylindrical roller bearing (dimension series 3 (medium-section ISO 15 envelope)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECJ: the E-design execution with a pressed sheet-steel window cage, for positions where polymer cages are temperature- or lubricant-limited. The radial section height is 75.0 mm and the catalogue mass 16500 g; at 720 kN dynamic rating this is roughly 5.54 kN of C per millimetre of bore before application factors. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 130 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "marine propulsion line shafts", "heavy turbogenerator rotor supports", "mining hoist and winder shafts", "offshore drawworks shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 326, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 326 ECJ and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 58 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 720/750 kN ratings are SKF catalogue 17000 (2018) values for the ECJ execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ326-ECJ?", "a": "SKF NJ 326 ECJ is a single-row caged cylindrical roller bearing with 130 mm bore, 280 mm OD and 58 mm width per ISO 15. SKF lists C 720 kN, C0 750 kN, Pu 81.5 kN, reference speed 2,400 r/min and limiting speed 3,000 r/min, mass about 16500 g." }, { "q": "What does the NJ designation and ECJ suffix mean?", "a": "The ECJ suffix marks the E-design execution with a pressed sheet-steel window cage, useful where polymer cages are temperature- or lubricant-limited. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ326-ECJ take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ326-ECJ compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ326", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×280×58 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "N326-ECM", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 130×280×58 mm and equivalent catalogue ratings; the N execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NU326-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 130×280×58 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP326-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 130×280×58 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ326-ECJ", "SKF NJ 326 ECJ" ], "locale_variants": {} }, { "sku": "NJ328-ECJ", "brand": "SKF", "manufacturer_designation": "SKF NJ 328 ECJ", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 300, "B_mm": 62, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 780, "static_load_kN": 830, "fatigue_load_limit_kN": 88, "max_rpm": 2800, "reference_speed_rpm": 2400, "limiting_speed_rpm": 2800, "weight_g": 20000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ328-ECJ is the 140 mm bore entry in the NJ300 range: a 140×300×62 mm single-row caged cylindrical roller bearing with a pressed sheet-steel window-type cage, rated C 780 kN / C0 830 kN. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECJ: the E-design execution with a pressed sheet-steel window cage, for positions where polymer cages are temperature- or lubricant-limited. Load-per-bore for the 140 mm seat is about 5.57 kN/mm, typical of dimension series 3 (medium-section ISO 15 envelope); use C0 830 kN for static checks such as crane hook blocks standing under load. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 140 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "offshore drawworks shafts", "large rolling-mill drive trains", "marine propulsion line shafts", "heavy turbogenerator rotor supports" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 328, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 328 ECJ and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 62 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 780/830 kN ratings are SKF catalogue 17000 (2018) values for the ECJ execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ328-ECJ?", "a": "SKF NJ 328 ECJ is a single-row caged cylindrical roller bearing with 140 mm bore, 300 mm OD and 62 mm width per ISO 15. SKF lists C 780 kN, C0 830 kN, Pu 88 kN, reference speed 2,400 r/min and limiting speed 2,800 r/min, mass about 20000 g." }, { "q": "What does the NJ designation and ECJ suffix mean?", "a": "The ECJ suffix marks the E-design execution with a pressed sheet-steel window cage, useful where polymer cages are temperature- or lubricant-limited. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ328-ECJ take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ328-ECJ compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ328", "equiv_brand": "NTN", "level": "partial", "note": "Same 140×300×62 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU328-ECM", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 140×300×62 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP328-ECM", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 140×300×62 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ328-ECJ", "SKF NJ 328 ECJ" ], "locale_variants": {} }, { "sku": "NJ330-ECML", "brand": "SKF", "manufacturer_designation": "SKF NJ 330 ECML", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 320, "B_mm": 65, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 900, "static_load_kN": 965, "fatigue_load_limit_kN": 100, "max_rpm": 4000, "reference_speed_rpm": 2200, "limiting_speed_rpm": 4000, "weight_g": 26500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ330-ECML is the 150 mm bore entry in the NJ300 range: a 150×320×65 mm single-row caged cylindrical roller bearing with a one-piece machined brass cage, rated C 900 kN / C0 965 kN. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECML: the E-design ECML execution with a one-piece machined brass cage for higher-temperature, higher-speed continuous duty. Speed planning for NJ330-ECML: the catalogue lists 2,200 r/min thermal reference speed and 4,000 r/min mechanical limiting speed. The mass entry 26500 g covers the complete catalogue execution. Fit practice for NJ330-ECML: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "mining hoist and winder shafts", "offshore drawworks shafts", "large rolling-mill drive trains", "marine propulsion line shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 330, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 330 ECML and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 320 mm raceway.", "The 900/965 kN ratings are SKF catalogue 17000 (2018) values for the ECML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ330-ECML?", "a": "SKF NJ 330 ECML is a single-row caged cylindrical roller bearing with 150 mm bore, 320 mm OD and 65 mm width per ISO 15. SKF lists C 900 kN, C0 965 kN, Pu 100 kN, reference speed 2,200 r/min and limiting speed 4,000 r/min, mass about 26500 g." }, { "q": "What does the NJ designation and ECML suffix mean?", "a": "The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ330-ECML take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ330-ECML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ330", "equiv_brand": "NTN", "level": "partial", "note": "Same 150×320×65 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU330-ECM", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 150×320×65 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ330-ECML", "SKF NJ 330 ECML" ], "locale_variants": {} }, { "sku": "NJ332-ECML", "brand": "SKF", "manufacturer_designation": "SKF NJ 332 ECML", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 160, "D_mm": 340, "B_mm": 68, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 1000, "static_load_kN": 1080, "fatigue_load_limit_kN": 112, "max_rpm": 3600, "reference_speed_rpm": 2000, "limiting_speed_rpm": 3600, "weight_g": 31000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NJ 332 ECML is a single-row caged cylindrical roller bearing sized 160×340×68 mm — a dimension series 3 (medium-section ISO 15 envelope), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECML: the E-design ECML execution with a one-piece machined brass cage for higher-temperature, higher-speed continuous duty. Selection arithmetic: C0/C ≈ 1.08 (1080 against 1000 kN), and the Pu figure 112 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 2,000 r/min thermal reference speed and 3,600 r/min mechanical limiting speed. Fit practice for NJ332-ECML: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "large rolling-mill drive trains", "marine propulsion line shafts", "heavy turbogenerator rotor supports", "mining hoist and winder shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 332, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 332 ECML and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 340 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 340 mm raceway.", "The 1000/1080 kN ratings are SKF catalogue 17000 (2018) values for the ECML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ332-ECML?", "a": "SKF NJ 332 ECML is a single-row caged cylindrical roller bearing with 160 mm bore, 340 mm OD and 68 mm width per ISO 15. SKF lists C 1000 kN, C0 1080 kN, Pu 112 kN, reference speed 2,000 r/min and limiting speed 3,600 r/min, mass about 31000 g." }, { "q": "What does the NJ designation and ECML suffix mean?", "a": "The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ332-ECML take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ332-ECML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ332", "equiv_brand": "NTN", "level": "partial", "note": "Same 160×340×68 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU332-ECML", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 160×340×68 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ332-ECML", "SKF NJ 332 ECML" ], "locale_variants": {} }, { "sku": "NJ336-ECM", "brand": "SKF", "manufacturer_designation": "SKF NJ 336 ECM", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 180, "D_mm": 380, "B_mm": 75, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 1020, "static_load_kN": 1290, "fatigue_load_limit_kN": 125, "max_rpm": 2200, "reference_speed_rpm": 1600, "limiting_speed_rpm": 2200, "weight_g": 44000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NJ 336 ECM is a single-row caged cylindrical roller bearing sized 180×380×75 mm — a dimension series 3 (medium-section ISO 15 envelope), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix ECM: the E-design ECM execution with a one-piece machined brass cage for higher-temperature, higher-speed continuous duty. Speed planning for NJ336-ECM: the catalogue lists 1,600 r/min thermal reference speed and 2,200 r/min mechanical limiting speed. The mass entry 44000 g covers the complete catalogue execution. Fit practice for NJ336-ECM: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "mining hoist and winder shafts", "offshore drawworks shafts", "large rolling-mill drive trains", "marine propulsion line shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 336, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 336 ECM and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 380 mm raceway.", "The 1020/1290 kN ratings are SKF catalogue 17000 (2018) values for the ECM execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ336-ECM?", "a": "SKF NJ 336 ECM is a single-row caged cylindrical roller bearing with 180 mm bore, 380 mm OD and 75 mm width per ISO 15. SKF lists C 1020 kN, C0 1290 kN, Pu 125 kN, reference speed 1,600 r/min and limiting speed 2,200 r/min, mass about 44000 g." }, { "q": "What does the NJ designation and ECM suffix mean?", "a": "The ECM suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ336-ECM take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ336-ECM compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ336", "equiv_brand": "NTN", "level": "partial", "note": "Same 180×380×75 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU336-ECM", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 180×380×75 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ336-ECM", "SKF NJ 336 ECM" ], "locale_variants": {} }, { "sku": "NJ340-ECML", "brand": "SKF", "manufacturer_designation": "SKF NJ 340 ECML", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 200, "D_mm": 420, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 1230, "static_load_kN": 1630, "fatigue_load_limit_kN": 150, "max_rpm": 2800, "reference_speed_rpm": 1400, "limiting_speed_rpm": 2800, "weight_g": 56500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NJ 340 ECML resolves to a 200×420×80 mm single-row caged cylindrical roller bearing (dimension series 3 (medium-section ISO 15 envelope)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Selection arithmetic: C0/C ≈ 1.33 (1630 against 1230 kN), and the Pu figure 150 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 1,400 r/min thermal reference speed and 2,800 r/min mechanical limiting speed. Fit practice for NJ340-ECML: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "large rolling-mill drive trains", "marine propulsion line shafts", "heavy turbogenerator rotor supports", "mining hoist and winder shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 340, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 340 ECML and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 80 mm-wide ring and concentrates load.", "The 1230/1630 kN ratings are SKF catalogue 17000 (2018) values for the ECML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ340-ECML?", "a": "SKF NJ 340 ECML is a single-row caged cylindrical roller bearing with 200 mm bore, 420 mm OD and 80 mm width per ISO 15. SKF lists C 1230 kN, C0 1630 kN, Pu 150 kN, reference speed 1,400 r/min and limiting speed 2,800 r/min, mass about 56500 g." }, { "q": "What does the NJ designation and ECML suffix mean?", "a": "The ECML suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ340-ECML take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ340-ECML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ340", "equiv_brand": "NTN", "level": "partial", "note": "Same 200×420×80 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU340-ECML", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 200×420×80 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ340-ECML", "SKF NJ 340 ECML" ], "locale_variants": {} }, { "sku": "NJ344-M", "brand": "SKF", "manufacturer_designation": "SKF NJ 344 M", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 220, "D_mm": 460, "B_mm": 88, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 1210, "static_load_kN": 1630, "fatigue_load_limit_kN": 150, "max_rpm": 1700, "reference_speed_rpm": 1500, "limiting_speed_rpm": 1700, "weight_g": 73500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 220 mm shaft, SKF lists NJ344-M as single-row caged cylindrical roller: 460 mm OD, 88 mm wide, Pu 150 kN, the catalogue lists 1,500 r/min thermal reference speed and 1,700 r/min mechanical limiting speed. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix M: the basic (non-E) M execution with a machined brass cage, standard for the larger and earlier-design sizes. With C 1210 kN and C0 1630 kN, size the bearing on the 220×460 mm ISO 15 envelope and check the 150 kN Pu against the equivalent-load floor; the catalogue lists 1,500 r/min thermal reference speed and 1,700 r/min mechanical limiting speed. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C.", "applications": [ "heavy turbogenerator rotor supports", "mining hoist and winder shafts", "offshore drawworks shafts", "large rolling-mill drive trains" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 344, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 344 M and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 88 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 88 mm-wide ring and concentrates load.", "The 1210/1630 kN ratings are SKF catalogue 17000 (2018) values for the M execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ344-M?", "a": "SKF NJ 344 M is a single-row caged cylindrical roller bearing with 220 mm bore, 460 mm OD and 88 mm width per ISO 15. SKF lists C 1210 kN, C0 1630 kN, Pu 150 kN, reference speed 1,500 r/min and limiting speed 1,700 r/min, mass about 73500 g." }, { "q": "What does the NJ designation and M suffix mean?", "a": "The M suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ344-M take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ344-M compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ344", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "NU344-M", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 220×460×88 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ344-M", "SKF NJ 344 M" ], "locale_variants": {} }, { "sku": "NJ348-MA", "brand": "SKF", "manufacturer_designation": "SKF NJ 348 MA", "series": "NJ300-series", "type": "cylindrical_roller", "d_mm": 240, "D_mm": 500, "B_mm": 95, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 1450, "static_load_kN": 2000, "fatigue_load_limit_kN": 180, "max_rpm": 2000, "reference_speed_rpm": 1300, "limiting_speed_rpm": 2000, "weight_g": 98500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NJ 348 MA is a single-row caged cylindrical roller bearing sized 240×500×95 mm — a dimension series 3 (medium-section ISO 15 envelope), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix MA: the basic (non-E) MA execution with a machined brass cage, standard for the larger and earlier-design sizes. The radial section height is 130.0 mm and the catalogue mass 98500 g; at 1450 kN dynamic rating this is roughly 6.04 kN of C per millimetre of bore before application factors. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C.", "applications": [ "marine propulsion line shafts", "heavy turbogenerator rotor supports", "mining hoist and winder shafts", "offshore drawworks shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 3 (medium-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 348, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 348 MA and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 500 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 95 mm-wide ring and concentrates load.", "The 1450/2000 kN ratings are SKF catalogue 17000 (2018) values for the MA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ348-MA?", "a": "SKF NJ 348 MA is a single-row caged cylindrical roller bearing with 240 mm bore, 500 mm OD and 95 mm width per ISO 15. SKF lists C 1450 kN, C0 2000 kN, Pu 180 kN, reference speed 1,300 r/min and limiting speed 2,000 r/min, mass about 98500 g." }, { "q": "What does the NJ designation and MA suffix mean?", "a": "The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ348-MA take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ348-MA compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ348", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "NU348-MA", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 240×500×95 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ348-MA", "SKF NJ 348 MA" ], "locale_variants": {} }, { "sku": "NJ406-MA", "brand": "SKF", "manufacturer_designation": "SKF NJ 406 MA", "series": "NJ400-series", "type": "cylindrical_roller", "d_mm": 30, "D_mm": 90, "B_mm": 23, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 60.5, "static_load_kN": 53, "fatigue_load_limit_kN": 6.8, "max_rpm": 11000, "reference_speed_rpm": 9000, "limiting_speed_rpm": 11000, "weight_g": 780, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 30 mm shaft, SKF lists NJ406-MA as single-row caged cylindrical roller: 90 mm OD, 23 mm wide, Pu 6.8 kN, the catalogue lists 9,000 r/min thermal reference speed and 11,000 r/min mechanical limiting speed. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. The one-piece machined brass cage is reflected in the published speeds and temperature limits. With C 60.5 kN and C0 53 kN, size the bearing on the 30×90 mm ISO 15 envelope and check the 6.8 kN Pu against the equivalent-load floor; the catalogue lists 9,000 r/min thermal reference speed and 11,000 r/min mechanical limiting speed. Fit practice for NJ406-MA: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "compressor crank and rotor shafts", "machine-tool radial spindle supports", "conveyor drive-pulley shafts", "medium industrial gearbox shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 4 (heavy-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 406, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 406 MA and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 60.5/53 kN ratings are SKF catalogue 17000 (2018) values for the MA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ406-MA?", "a": "SKF NJ 406 MA is a single-row caged cylindrical roller bearing with 30 mm bore, 90 mm OD and 23 mm width per ISO 15. SKF lists C 60.5 kN, C0 53 kN, Pu 6.8 kN, reference speed 9,000 r/min and limiting speed 11,000 r/min, mass about 780 g." }, { "q": "What does the NJ designation and MA suffix mean?", "a": "The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ406-MA take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ406-MA compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ406", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×90×23 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU406-MA", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 30×90×23 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ406-MA", "SKF NJ 406 MA" ], "locale_variants": {} }, { "sku": "NJ407", "brand": "SKF", "manufacturer_designation": "SKF NJ 407", "series": "NJ400-series", "type": "cylindrical_roller", "d_mm": 35, "D_mm": 100, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 76.5, "static_load_kN": 69.5, "fatigue_load_limit_kN": 9, "max_rpm": 9500, "reference_speed_rpm": 8000, "limiting_speed_rpm": 9500, "weight_g": 1000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NJ 407 resolves to a 35×100×25 mm single-row caged cylindrical roller bearing (dimension series 4 (heavy-section ISO 15 envelope)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The plain designation (no cage suffix) identifies the basic execution supplied with a standard pressed-steel cage. The pressed sheet-steel window-type cage is reflected in the published speeds and temperature limits. The radial section height is 32.5 mm and the catalogue mass 1000 g; at 76.5 kN dynamic rating this is roughly 2.19 kN of C per millimetre of bore before application factors. Fit practice for NJ407: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "electric-motor shafts in pumps and fans", "compressor crank and rotor shafts", "machine-tool radial spindle supports", "conveyor drive-pulley shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 4 (heavy-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 407, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 407 and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 100 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 76.5/69.5 kN ratings are SKF catalogue 17000 (2018) values for the basic execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ407?", "a": "SKF NJ 407 is a single-row caged cylindrical roller bearing with 35 mm bore, 100 mm OD and 25 mm width per ISO 15. SKF lists C 76.5 kN, C0 69.5 kN, Pu 9 kN, reference speed 8,000 r/min and limiting speed 9,500 r/min, mass about 1000 g." }, { "q": "What does the NJ designation and plain suffix mean?", "a": "The plain designation (no cage suffix) identifies the basic execution supplied with a standard pressed-steel cage. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ407 take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ407 compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ407-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "NU407", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 35×100×25 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ407", "SKF NJ 407" ], "locale_variants": {} }, { "sku": "NJ408-M", "brand": "SKF", "manufacturer_designation": "SKF NJ 408 M", "series": "NJ400-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 110, "B_mm": 27, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 96.8, "static_load_kN": 90, "fatigue_load_limit_kN": 11.6, "max_rpm": 8500, "reference_speed_rpm": 7000, "limiting_speed_rpm": 8500, "weight_g": 1300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ408-M is the 40 mm bore entry in the NJ400 range: a 40×110×27 mm single-row caged cylindrical roller bearing with a one-piece machined brass cage, rated C 96.8 kN / C0 90 kN. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. Reading the order-string suffix M: the basic (non-E) M execution with a machined brass cage, standard for the larger and earlier-design sizes. Selection arithmetic: C0/C ≈ 0.93 (90 against 96.8 kN), and the Pu figure 11.6 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 7,000 r/min thermal reference speed and 8,500 r/min mechanical limiting speed. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 40 mm seat normally takes a k5 interference with an H7 housing bore when the inner ring rotates.", "applications": [ "medium industrial gearbox shafts", "electric-motor shafts in pumps and fans", "compressor crank and rotor shafts", "machine-tool radial spindle supports" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 4 (heavy-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 408, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 408 M and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 96.8/90 kN ratings are SKF catalogue 17000 (2018) values for the M execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ408-M?", "a": "SKF NJ 408 M is a single-row caged cylindrical roller bearing with 40 mm bore, 110 mm OD and 27 mm width per ISO 15. SKF lists C 96.8 kN, C0 90 kN, Pu 11.6 kN, reference speed 7,000 r/min and limiting speed 8,500 r/min, mass about 1300 g." }, { "q": "What does the NJ designation and M suffix mean?", "a": "The M suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ408-M take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ408-M compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ408", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "NU408-M", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 40×110×27 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ408-M", "SKF NJ 408 M" ], "locale_variants": {} }, { "sku": "NJ409", "brand": "SKF", "manufacturer_designation": "SKF NJ 409", "series": "NJ400-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 120, "B_mm": 29, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 106, "static_load_kN": 102, "fatigue_load_limit_kN": 13.4, "max_rpm": 7500, "reference_speed_rpm": 6700, "limiting_speed_rpm": 7500, "weight_g": 1650, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ409 is the 45 mm bore entry in the NJ400 range: a 45×120×29 mm single-row caged cylindrical roller bearing with a pressed sheet-steel window-type cage, rated C 106 kN / C0 102 kN. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The plain designation (no cage suffix) identifies the basic execution supplied with a standard pressed-steel cage. The pressed sheet-steel window-type cage is reflected in the published speeds and temperature limits. The radial section height is 37.5 mm and the catalogue mass 1650 g; at 106 kN dynamic rating this is roughly 2.36 kN of C per millimetre of bore before application factors. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 45 mm seat normally takes a k5 interference with an H7 housing bore when the inner ring rotates.", "applications": [ "electric-motor shafts in pumps and fans", "compressor crank and rotor shafts", "machine-tool radial spindle supports", "conveyor drive-pulley shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 4 (heavy-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 409, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 409 and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 29 mm-wide ring and concentrates load.", "The 106/102 kN ratings are SKF catalogue 17000 (2018) values for the basic execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ409?", "a": "SKF NJ 409 is a single-row caged cylindrical roller bearing with 45 mm bore, 120 mm OD and 29 mm width per ISO 15. SKF lists C 106 kN, C0 102 kN, Pu 13.4 kN, reference speed 6,700 r/min and limiting speed 7,500 r/min, mass about 1650 g." }, { "q": "What does the NJ designation and plain suffix mean?", "a": "The plain designation (no cage suffix) identifies the basic execution supplied with a standard pressed-steel cage. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ409 take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ409 compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ409-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×120×29 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU409", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 45×120×29 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ409", "SKF NJ 409" ], "locale_variants": {} }, { "sku": "NJ410", "brand": "SKF", "manufacturer_designation": "SKF NJ 410", "series": "NJ400-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 130, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 130, "static_load_kN": 127, "fatigue_load_limit_kN": 16.6, "max_rpm": 7000, "reference_speed_rpm": 6000, "limiting_speed_rpm": 7000, "weight_g": 2050, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 50 mm shaft, SKF lists NJ410 as single-row caged cylindrical roller: 130 mm OD, 31 mm wide, Pu 16.6 kN, the catalogue lists 6,000 r/min thermal reference speed and 7,000 r/min mechanical limiting speed. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The plain designation (no cage suffix) identifies the basic execution supplied with a standard pressed-steel cage. The pressed sheet-steel window-type cage is reflected in the published speeds and temperature limits. Speed planning for NJ410: the catalogue lists 6,000 r/min thermal reference speed and 7,000 r/min mechanical limiting speed. The mass entry 2050 g covers the complete catalogue execution. Fit practice for NJ410: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "machine-tool radial spindle supports", "conveyor drive-pulley shafts", "medium industrial gearbox shafts", "electric-motor shafts in pumps and fans" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 4 (heavy-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 410, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 410 and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 130 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 130/127 kN ratings are SKF catalogue 17000 (2018) values for the basic execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ410?", "a": "SKF NJ 410 is a single-row caged cylindrical roller bearing with 50 mm bore, 130 mm OD and 31 mm width per ISO 15. SKF lists C 130 kN, C0 127 kN, Pu 16.6 kN, reference speed 6,000 r/min and limiting speed 7,000 r/min, mass about 2050 g." }, { "q": "What does the NJ designation and plain suffix mean?", "a": "The plain designation (no cage suffix) identifies the basic execution supplied with a standard pressed-steel cage. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ410 take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ410 compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ410-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "NU410", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 50×130×31 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ410", "SKF NJ 410" ], "locale_variants": {} }, { "sku": "NJ411", "brand": "SKF", "manufacturer_designation": "SKF NJ 411", "series": "NJ400-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 140, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 142, "static_load_kN": 140, "fatigue_load_limit_kN": 18.6, "max_rpm": 6300, "reference_speed_rpm": 5600, "limiting_speed_rpm": 6300, "weight_g": 2550, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NJ 411 resolves to a 55×140×33 mm single-row caged cylindrical roller bearing (dimension series 4 (heavy-section ISO 15 envelope)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The plain designation (no cage suffix) identifies the basic execution supplied with a standard pressed-steel cage. The pressed sheet-steel window-type cage is reflected in the published speeds and temperature limits. Speed planning for NJ411: the catalogue lists 5,600 r/min thermal reference speed and 6,300 r/min mechanical limiting speed. The mass entry 2550 g covers the complete catalogue execution. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C.", "applications": [ "machine-tool radial spindle supports", "conveyor drive-pulley shafts", "medium industrial gearbox shafts", "electric-motor shafts in pumps and fans" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 4 (heavy-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 411, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 411 and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 33 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 140 mm raceway.", "The 142/140 kN ratings are SKF catalogue 17000 (2018) values for the basic execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ411?", "a": "SKF NJ 411 is a single-row caged cylindrical roller bearing with 55 mm bore, 140 mm OD and 33 mm width per ISO 15. SKF lists C 142 kN, C0 140 kN, Pu 18.6 kN, reference speed 5,600 r/min and limiting speed 6,300 r/min, mass about 2550 g." }, { "q": "What does the NJ designation and plain suffix mean?", "a": "The plain designation (no cage suffix) identifies the basic execution supplied with a standard pressed-steel cage. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ411 take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ411 compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ411-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "NU411", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 55×140×33 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ411", "SKF NJ 411" ], "locale_variants": {} }, { "sku": "NJ412", "brand": "SKF", "manufacturer_designation": "SKF NJ 412", "series": "NJ400-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 150, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 168, "static_load_kN": 173, "fatigue_load_limit_kN": 22, "max_rpm": 6000, "reference_speed_rpm": 5000, "limiting_speed_rpm": 6000, "weight_g": 3050, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NJ 412 is a single-row caged cylindrical roller bearing sized 60×150×35 mm — a dimension series 4 (heavy-section ISO 15 envelope), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The plain designation (no cage suffix) identifies the basic execution supplied with a standard pressed-steel cage. The pressed sheet-steel window-type cage is reflected in the published speeds and temperature limits. Speed planning for NJ412: the catalogue lists 5,000 r/min thermal reference speed and 6,000 r/min mechanical limiting speed. The mass entry 3050 g covers the complete catalogue execution. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 60 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "paper-machine press rolls", "cement-plant conveyor drives", "heavy gearbox and pinion shafts", "large pump and blower rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 4 (heavy-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 412, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 412 and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 35 mm-wide ring and concentrates load.", "The 168/173 kN ratings are SKF catalogue 17000 (2018) values for the basic execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ412?", "a": "SKF NJ 412 is a single-row caged cylindrical roller bearing with 60 mm bore, 150 mm OD and 35 mm width per ISO 15. SKF lists C 168 kN, C0 173 kN, Pu 22 kN, reference speed 5,000 r/min and limiting speed 6,000 r/min, mass about 3050 g." }, { "q": "What does the NJ designation and plain suffix mean?", "a": "The plain designation (no cage suffix) identifies the basic execution supplied with a standard pressed-steel cage. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ412 take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ412 compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ412-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "NU412", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 60×150×35 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ412", "SKF NJ 412" ], "locale_variants": {} }, { "sku": "NJ413", "brand": "SKF", "manufacturer_designation": "SKF NJ 413", "series": "NJ400-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 160, "B_mm": 37, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 183, "static_load_kN": 190, "fatigue_load_limit_kN": 24, "max_rpm": 5600, "reference_speed_rpm": 4800, "limiting_speed_rpm": 5600, "weight_g": 3650, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJ413 is the 65 mm bore entry in the NJ400 range: a 65×160×37 mm single-row caged cylindrical roller bearing with a pressed sheet-steel window-type cage, rated C 183 kN / C0 190 kN. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The plain designation (no cage suffix) identifies the basic execution supplied with a standard pressed-steel cage. The pressed sheet-steel window-type cage is reflected in the published speeds and temperature limits. Speed planning for NJ413: the catalogue lists 4,800 r/min thermal reference speed and 5,600 r/min mechanical limiting speed. The mass entry 3650 g covers the complete catalogue execution. Fit practice for NJ413: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "paper-machine press rolls", "cement-plant conveyor drives", "heavy gearbox and pinion shafts", "large pump and blower rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 4 (heavy-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 413, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 413 and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 160 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 183/190 kN ratings are SKF catalogue 17000 (2018) values for the basic execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ413?", "a": "SKF NJ 413 is a single-row caged cylindrical roller bearing with 65 mm bore, 160 mm OD and 37 mm width per ISO 15. SKF lists C 183 kN, C0 190 kN, Pu 24 kN, reference speed 4,800 r/min and limiting speed 5,600 r/min, mass about 3650 g." }, { "q": "What does the NJ designation and plain suffix mean?", "a": "The plain designation (no cage suffix) identifies the basic execution supplied with a standard pressed-steel cage. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ413 take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ413 compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ413-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "NU413", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 65×160×37 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ413", "SKF NJ 413" ], "locale_variants": {} }, { "sku": "NJ414-MA", "brand": "SKF", "manufacturer_designation": "SKF NJ 414 MA", "series": "NJ400-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 180, "B_mm": 42, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 229, "static_load_kN": 240, "fatigue_load_limit_kN": 30, "max_rpm": 5000, "reference_speed_rpm": 4300, "limiting_speed_rpm": 5000, "weight_g": 5450, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NJ 414 MA resolves to a 70×180×42 mm single-row caged cylindrical roller bearing (dimension series 4 (heavy-section ISO 15 envelope)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Load-per-bore for the 70 mm seat is about 3.27 kN/mm, typical of dimension series 4 (heavy-section ISO 15 envelope); use C0 240 kN for static checks such as crane hook blocks standing under load. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 70 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "cement-plant conveyor drives", "heavy gearbox and pinion shafts", "large pump and blower rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 4 (heavy-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 414, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 414 MA and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 180 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 180 mm raceway.", "The 229/240 kN ratings are SKF catalogue 17000 (2018) values for the MA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ414-MA?", "a": "SKF NJ 414 MA is a single-row caged cylindrical roller bearing with 70 mm bore, 180 mm OD and 42 mm width per ISO 15. SKF lists C 229 kN, C0 240 kN, Pu 30 kN, reference speed 4,300 r/min and limiting speed 5,000 r/min, mass about 5450 g." }, { "q": "What does the NJ designation and MA suffix mean?", "a": "The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ414-MA take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ414-MA compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ414", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "NU414-MA", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 70×180×42 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ414-MA", "SKF NJ 414 MA" ], "locale_variants": {} }, { "sku": "NJ415", "brand": "SKF", "manufacturer_designation": "SKF NJ 415", "series": "NJ400-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 190, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 264, "static_load_kN": 280, "fatigue_load_limit_kN": 34, "max_rpm": 4800, "reference_speed_rpm": 4000, "limiting_speed_rpm": 4800, "weight_g": 6400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 75 mm shaft, SKF lists NJ415 as single-row caged cylindrical roller: 190 mm OD, 45 mm wide, Pu 34 kN, the catalogue lists 4,000 r/min thermal reference speed and 4,800 r/min mechanical limiting speed. Structurally, the NJ design has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. In arrangement terms it is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The plain designation (no cage suffix) identifies the basic execution supplied with a standard pressed-steel cage. The pressed sheet-steel window-type cage is reflected in the published speeds and temperature limits. Speed planning for NJ415: the catalogue lists 4,000 r/min thermal reference speed and 4,800 r/min mechanical limiting speed. The mass entry 6400 g covers the complete catalogue execution. Mounting: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. A 75 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "paper-machine press rolls", "cement-plant conveyor drives", "heavy gearbox and pinion shafts", "large pump and blower rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 4 (heavy-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 415, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 415 and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 45 mm-wide ring and concentrates load.", "The 264/280 kN ratings are SKF catalogue 17000 (2018) values for the basic execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ415?", "a": "SKF NJ 415 is a single-row caged cylindrical roller bearing with 75 mm bore, 190 mm OD and 45 mm width per ISO 15. SKF lists C 264 kN, C0 280 kN, Pu 34 kN, reference speed 4,000 r/min and limiting speed 4,800 r/min, mass about 6400 g." }, { "q": "What does the NJ designation and plain suffix mean?", "a": "The plain designation (no cage suffix) identifies the basic execution supplied with a standard pressed-steel cage. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ415 take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ415 compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ415-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "NU415", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 75×190×45 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ415", "SKF NJ 415" ], "locale_variants": {} }, { "sku": "NJ416", "brand": "SKF", "manufacturer_designation": "SKF NJ 416", "series": "NJ400-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 200, "B_mm": 48, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 303, "static_load_kN": 320, "fatigue_load_limit_kN": 39, "max_rpm": 4500, "reference_speed_rpm": 3800, "limiting_speed_rpm": 4500, "weight_g": 7550, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NJ 416 resolves to a 80×200×48 mm single-row caged cylindrical roller bearing (dimension series 4 (heavy-section ISO 15 envelope)); two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. The NJ configuration means two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set; functionally the bearing is able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The plain designation (no cage suffix) identifies the basic execution supplied with a standard pressed-steel cage. The pressed sheet-steel window-type cage is reflected in the published speeds and temperature limits. Speed planning for NJ416: the catalogue lists 3,800 r/min thermal reference speed and 4,500 r/min mechanical limiting speed. The mass entry 7550 g covers the complete catalogue execution. Fit practice for NJ416: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "paper-machine press rolls", "cement-plant conveyor drives", "heavy gearbox and pinion shafts", "large pump and blower rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 4 (heavy-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 416, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 416 and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 200 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 303/320 kN ratings are SKF catalogue 17000 (2018) values for the basic execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ416?", "a": "SKF NJ 416 is a single-row caged cylindrical roller bearing with 80 mm bore, 200 mm OD and 48 mm width per ISO 15. SKF lists C 303 kN, C0 320 kN, Pu 39 kN, reference speed 3,800 r/min and limiting speed 4,500 r/min, mass about 7550 g." }, { "q": "What does the NJ designation and plain suffix mean?", "a": "The plain designation (no cage suffix) identifies the basic execution supplied with a standard pressed-steel cage. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ416 take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ416 compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ416-NTN", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "NU416", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 80×200×48 mm and equivalent catalogue ratings; the NU execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ416", "SKF NJ 416" ], "locale_variants": {} }, { "sku": "NJ422-M", "brand": "SKF", "manufacturer_designation": "SKF NJ 422 M", "series": "NJ400-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 280, "B_mm": 65, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 550, "static_load_kN": 630, "fatigue_load_limit_kN": 69.5, "max_rpm": 3200, "reference_speed_rpm": 2600, "limiting_speed_rpm": 3200, "weight_g": 22500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJ 422 M denotes a single-row caged cylindrical roller bearing on the ISO 15 110×280×65 mm envelope, dimension series 4 (heavy-section ISO 15 envelope), with catalogue mass 22500 g. Reading the NJ prefix: two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set. This makes the execution able to locate the shaft axially in one direction; an HJ angle ring on the opposite side converts it into two-direction location. The M suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. The one-piece machined brass cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 1.15 (630 against 550 kN), and the Pu figure 69.5 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 2,600 r/min thermal reference speed and 3,200 r/min mechanical limiting speed. Assembly note: orient the inner-ring flange side toward the axial load direction; if an HJ angle ring is used, verify its fit and clearance before locking the arrangement. Heat steel rings inductively to max 120 °C.", "applications": [ "heavy gearbox and pinion shafts", "large pump and blower rotors", "rolling-mill auxiliary drive shafts", "paper-machine press rolls" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Do not use a NJ bearing where two-direction axial location is required without an HJ angle ring", "The dimension series 4 (heavy-section ISO 15 envelope) envelope is shared with the N/NU/NJ/NUP executions of 422, but flange configuration and axial-locating behaviour differ — quote the full SKF NJ 422 M and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 65 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 280 mm raceway.", "The 550/630 kN ratings are SKF catalogue 17000 (2018) values for the M execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJ422-M?", "a": "SKF NJ 422 M is a single-row caged cylindrical roller bearing with 110 mm bore, 280 mm OD and 65 mm width per ISO 15. SKF lists C 550 kN, C0 630 kN, Pu 69.5 kN, reference speed 2,600 r/min and limiting speed 3,200 r/min, mass about 22500 g." }, { "q": "What does the NJ designation and M suffix mean?", "a": "The M suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the inner ring and no flanges on the outer ring; the inner ring retains the roller set." }, { "q": "Can NJ422-M take axial load and locate the shaft?", "a": "In one direction only, via the two inner-ring flanges. Add an HJ angle ring on the opposite side for two-direction location." }, { "q": "How does NJ422-M compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ422", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJ422-M", "SKF NJ 422 M" ], "locale_variants": {} }, { "sku": "NJG2305-VH", "brand": "SKF", "manufacturer_designation": "SKF NJG 2305 VH", "series": "NJG2300-series", "type": "cylindrical_roller", "d_mm": 25, "D_mm": 62, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 68.2, "static_load_kN": 68, "fatigue_load_limit_kN": 8.5, "max_rpm": 5600, "reference_speed_rpm": 4500, "limiting_speed_rpm": 5600, "weight_g": 380, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NJG 2305 VH resolves to a 25×62×24 mm single-row full-complement cylindrical roller bearing (dimension series 23 (medium-section, wide)); a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling. The NJG configuration means a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling; functionally the bearing is one-direction locating: it positions the shaft axially in one direction and accommodates axial displacement in the opposite direction. Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. The radial section height is 18.5 mm and the catalogue mass 380 g; at 68.2 kN dynamic rating this is roughly 2.73 kN of C per millimetre of bore before application factors. Assembly note: low-speed duty only: the uncaged rollers smear when skidding, so keep minimum radial load high, accelerate gently and favour oil bath or grease with high base-oil viscosity. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "small gearbox low-speed shafts", "machine-tool indexing drives", "crane trolley wheel hubs" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 5,600 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 62 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 62 mm raceway.", "The 68.2/68 kN ratings are SKF catalogue 17000 (2018) values for the VH execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJG2305-VH?", "a": "SKF NJG 2305 VH is a single-row full-complement cylindrical roller bearing with 25 mm bore, 62 mm OD and 24 mm width per ISO 15. SKF lists C 68.2 kN, C0 68 kN, Pu 8.5 kN, reference speed 4,500 r/min and limiting speed 5,600 r/min, mass about 380 g." }, { "q": "What does the NJG designation and VH suffix mean?", "a": "Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling." }, { "q": "Can NJG2305-VH take axial load and locate the shaft?", "a": "In one direction; the opposite direction accommodates displacement. It is a low-speed full-complement bearing, not a high-speed thrust solution." }, { "q": "How does NJG2305-VH compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NJG2305", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJG2305-VH", "SKF NJG 2305 VH" ], "locale_variants": {} }, { "sku": "NJG2306-VH", "brand": "SKF", "manufacturer_designation": "SKF NJG 2306 VH", "series": "NJG2300-series", "type": "cylindrical_roller", "d_mm": 30, "D_mm": 72, "B_mm": 27, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 84.2, "static_load_kN": 86.5, "fatigue_load_limit_kN": 11, "max_rpm": 4800, "reference_speed_rpm": 4000, "limiting_speed_rpm": 4800, "weight_g": 560, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJG2306-VH is the 30 mm bore entry in the NJG2300 range: a 30×72×27 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 84.2 kN / C0 86.5 kN. The NJG configuration means a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling; functionally the bearing is one-direction locating: it positions the shaft axially in one direction and accommodates axial displacement in the opposite direction. Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Speed planning for NJG2306-VH: the catalogue lists 4,000 r/min thermal reference speed and 4,800 r/min mechanical limiting speed. The mass entry 560 g covers the complete catalogue execution. Mounting: low-speed duty only: the uncaged rollers smear when skidding, so keep minimum radial load high, accelerate gently and favour oil bath or grease with high base-oil viscosity. A 30 mm seat normally takes a k5 interference with an H7 housing bore when the inner ring rotates.", "applications": [ "slew and swing drives", "heavy gearbox output shafts", "crane travel-wheel bearings", "rolling-mill table rollers" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 4,800 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 72 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 27 mm-wide ring and concentrates load.", "The 84.2/86.5 kN ratings are SKF catalogue 17000 (2018) values for the VH execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJG2306-VH?", "a": "SKF NJG 2306 VH is a single-row full-complement cylindrical roller bearing with 30 mm bore, 72 mm OD and 27 mm width per ISO 15. SKF lists C 84.2 kN, C0 86.5 kN, Pu 11 kN, reference speed 4,000 r/min and limiting speed 4,800 r/min, mass about 560 g." }, { "q": "What does the NJG designation and VH suffix mean?", "a": "Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling." }, { "q": "Can NJG2306-VH take axial load and locate the shaft?", "a": "In one direction; the opposite direction accommodates displacement. It is a low-speed full-complement bearing, not a high-speed thrust solution." }, { "q": "How does NJG2306-VH compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NJG2306", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJG2306-VH", "SKF NJG 2306 VH" ], "locale_variants": {} }, { "sku": "NJG2307-VH", "brand": "SKF", "manufacturer_designation": "SKF NJG 2307 VH", "series": "NJG2300-series", "type": "cylindrical_roller", "d_mm": 35, "D_mm": 80, "B_mm": 31, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 108, "static_load_kN": 114, "fatigue_load_limit_kN": 14.3, "max_rpm": 4300, "reference_speed_rpm": 3400, "limiting_speed_rpm": 4300, "weight_g": 750, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 35 mm shaft, SKF lists NJG2307-VH as single-row full-complement cylindrical roller: 80 mm OD, 31 mm wide, Pu 14.3 kN, the catalogue lists 3,400 r/min thermal reference speed and 4,300 r/min mechanical limiting speed. The NJG configuration means a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling; functionally the bearing is one-direction locating: it positions the shaft axially in one direction and accommodates axial displacement in the opposite direction. Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 1.06 (114 against 108 kN), and the Pu figure 14.3 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 3,400 r/min thermal reference speed and 4,300 r/min mechanical limiting speed. Fit practice for NJG2307-VH: low-speed duty only: the uncaged rollers smear when skidding, so keep minimum radial load high, accelerate gently and favour oil bath or grease with high base-oil viscosity. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "heavy gearbox output shafts", "crane travel-wheel bearings", "rolling-mill table rollers", "slew and swing drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 4,300 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 80 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 108/114 kN ratings are SKF catalogue 17000 (2018) values for the VH execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJG2307-VH?", "a": "SKF NJG 2307 VH is a single-row full-complement cylindrical roller bearing with 35 mm bore, 80 mm OD and 31 mm width per ISO 15. SKF lists C 108 kN, C0 114 kN, Pu 14.3 kN, reference speed 3,400 r/min and limiting speed 4,300 r/min, mass about 750 g." }, { "q": "What does the NJG designation and VH suffix mean?", "a": "Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling." }, { "q": "Can NJG2307-VH take axial load and locate the shaft?", "a": "In one direction; the opposite direction accommodates displacement. It is a low-speed full-complement bearing, not a high-speed thrust solution." }, { "q": "How does NJG2307-VH compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NJG2307", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJG2307-VH", "SKF NJG 2307 VH" ], "locale_variants": {} }, { "sku": "NJG2308-VH", "brand": "SKF", "manufacturer_designation": "SKF NJG 2308 VH", "series": "NJG2300-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 90, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 145, "static_load_kN": 156, "fatigue_load_limit_kN": 20, "max_rpm": 3600, "reference_speed_rpm": 3000, "limiting_speed_rpm": 3600, "weight_g": 1000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NJG 2308 VH is a single-row full-complement cylindrical roller bearing sized 40×90×33 mm — a dimension series 23 (medium-section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. The NJG configuration means a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling; functionally the bearing is one-direction locating: it positions the shaft axially in one direction and accommodates axial displacement in the opposite direction. Reading the order-string suffix VH: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Speed planning for NJG2308-VH: the catalogue lists 3,000 r/min thermal reference speed and 3,600 r/min mechanical limiting speed. The mass entry 1000 g covers the complete catalogue execution. Mounting: low-speed duty only: the uncaged rollers smear when skidding, so keep minimum radial load high, accelerate gently and favour oil bath or grease with high base-oil viscosity. A 40 mm seat normally takes a k5 interference with an H7 housing bore when the inner ring rotates.", "applications": [ "rolling-mill table rollers", "slew and swing drives", "heavy gearbox output shafts", "crane travel-wheel bearings" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 3,600 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 90 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 145/156 kN ratings are SKF catalogue 17000 (2018) values for the VH execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJG2308-VH?", "a": "SKF NJG 2308 VH is a single-row full-complement cylindrical roller bearing with 40 mm bore, 90 mm OD and 33 mm width per ISO 15. SKF lists C 145 kN, C0 156 kN, Pu 20 kN, reference speed 3,000 r/min and limiting speed 3,600 r/min, mass about 1000 g." }, { "q": "What does the NJG designation and VH suffix mean?", "a": "Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling." }, { "q": "Can NJG2308-VH take axial load and locate the shaft?", "a": "In one direction; the opposite direction accommodates displacement. It is a low-speed full-complement bearing, not a high-speed thrust solution." }, { "q": "How does NJG2308-VH compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NJG2308", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJG2308-VH", "SKF NJG 2308 VH" ], "locale_variants": {} }, { "sku": "NJG2309-VH", "brand": "SKF", "manufacturer_designation": "SKF NJG 2309 VH", "series": "NJG2300-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 100, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 172, "static_load_kN": 196, "fatigue_load_limit_kN": 25.5, "max_rpm": 3400, "reference_speed_rpm": 2800, "limiting_speed_rpm": 3400, "weight_g": 1400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJG 2309 VH denotes a single-row full-complement cylindrical roller bearing on the ISO 15 45×100×36 mm envelope, dimension series 23 (medium-section, wide), with catalogue mass 1400 g. The NJG configuration means a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling; functionally the bearing is one-direction locating: it positions the shaft axially in one direction and accommodates axial displacement in the opposite direction. Reading the order-string suffix VH: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 1.14 (196 against 172 kN), and the Pu figure 25.5 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 2,800 r/min thermal reference speed and 3,400 r/min mechanical limiting speed. Fit practice for NJG2309-VH: low-speed duty only: the uncaged rollers smear when skidding, so keep minimum radial load high, accelerate gently and favour oil bath or grease with high base-oil viscosity. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "slew and swing drives", "heavy gearbox output shafts", "crane travel-wheel bearings", "rolling-mill table rollers" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 3,400 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 100 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 100 mm raceway.", "The 172/196 kN ratings are SKF catalogue 17000 (2018) values for the VH execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJG2309-VH?", "a": "SKF NJG 2309 VH is a single-row full-complement cylindrical roller bearing with 45 mm bore, 100 mm OD and 36 mm width per ISO 15. SKF lists C 172 kN, C0 196 kN, Pu 25.5 kN, reference speed 2,800 r/min and limiting speed 3,400 r/min, mass about 1400 g." }, { "q": "What does the NJG designation and VH suffix mean?", "a": "Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling." }, { "q": "Can NJG2309-VH take axial load and locate the shaft?", "a": "In one direction; the opposite direction accommodates displacement. It is a low-speed full-complement bearing, not a high-speed thrust solution." }, { "q": "How does NJG2309-VH compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NJG2309", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJG2309-VH", "SKF NJG 2309 VH" ], "locale_variants": {} }, { "sku": "NJG2311-VH", "brand": "SKF", "manufacturer_designation": "SKF NJG 2311 VH", "series": "NJG2300-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 120, "B_mm": 43, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 233, "static_load_kN": 260, "fatigue_load_limit_kN": 33.5, "max_rpm": 2800, "reference_speed_rpm": 2200, "limiting_speed_rpm": 2800, "weight_g": 2300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJG2311-VH is the 55 mm bore entry in the NJG2300 range: a 55×120×43 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 233 kN / C0 260 kN. Reading the NJG prefix: a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling. This makes the execution one-direction locating: it positions the shaft axially in one direction and accommodates axial displacement in the opposite direction. Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. With C 233 kN and C0 260 kN, size the bearing on the 55×120 mm ISO 15 envelope and check the 33.5 kN Pu against the equivalent-load floor; the catalogue lists 2,200 r/min thermal reference speed and 2,800 r/min mechanical limiting speed. Mounting: low-speed duty only: the uncaged rollers smear when skidding, so keep minimum radial load high, accelerate gently and favour oil bath or grease with high base-oil viscosity. A 55 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "slew and swing drives", "heavy gearbox output shafts", "crane travel-wheel bearings", "rolling-mill table rollers" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 2,800 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 43 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 43 mm-wide ring and concentrates load.", "The 233/260 kN ratings are SKF catalogue 17000 (2018) values for the VH execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJG2311-VH?", "a": "SKF NJG 2311 VH is a single-row full-complement cylindrical roller bearing with 55 mm bore, 120 mm OD and 43 mm width per ISO 15. SKF lists C 233 kN, C0 260 kN, Pu 33.5 kN, reference speed 2,200 r/min and limiting speed 2,800 r/min, mass about 2300 g." }, { "q": "What does the NJG designation and VH suffix mean?", "a": "Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling." }, { "q": "Can NJG2311-VH take axial load and locate the shaft?", "a": "In one direction; the opposite direction accommodates displacement. It is a low-speed full-complement bearing, not a high-speed thrust solution." }, { "q": "How does NJG2311-VH compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NJG2311", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJG2311-VH", "SKF NJG 2311 VH" ], "locale_variants": {} }, { "sku": "NJG2313-VH", "brand": "SKF", "manufacturer_designation": "SKF NJG 2313 VH", "series": "NJG2300-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 140, "B_mm": 48, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 303, "static_load_kN": 360, "fatigue_load_limit_kN": 46.5, "max_rpm": 2400, "reference_speed_rpm": 1900, "limiting_speed_rpm": 2400, "weight_g": 3550, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NJG 2313 VH is a single-row full-complement cylindrical roller bearing sized 65×140×48 mm — a dimension series 23 (medium-section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. Reading the NJG prefix: a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling. This makes the execution one-direction locating: it positions the shaft axially in one direction and accommodates axial displacement in the opposite direction. Reading the order-string suffix VH: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. With C 303 kN and C0 360 kN, size the bearing on the 65×140 mm ISO 15 envelope and check the 46.5 kN Pu against the equivalent-load floor; the catalogue lists 1,900 r/min thermal reference speed and 2,400 r/min mechanical limiting speed. Mounting: low-speed duty only: the uncaged rollers smear when skidding, so keep minimum radial load high, accelerate gently and favour oil bath or grease with high base-oil viscosity. A 65 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "wind turbine rotor-lock and yaw drives", "large gearbox slow-speed stages", "rolling-mill auxiliary shafts", "heavy conveyor pulley bearings" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 2,400 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 48 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 303/360 kN ratings are SKF catalogue 17000 (2018) values for the VH execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJG2313-VH?", "a": "SKF NJG 2313 VH is a single-row full-complement cylindrical roller bearing with 65 mm bore, 140 mm OD and 48 mm width per ISO 15. SKF lists C 303 kN, C0 360 kN, Pu 46.5 kN, reference speed 1,900 r/min and limiting speed 2,400 r/min, mass about 3550 g." }, { "q": "What does the NJG designation and VH suffix mean?", "a": "Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling." }, { "q": "Can NJG2313-VH take axial load and locate the shaft?", "a": "In one direction; the opposite direction accommodates displacement. It is a low-speed full-complement bearing, not a high-speed thrust solution." }, { "q": "How does NJG2313-VH compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NJG2313", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJG2313-VH", "SKF NJG 2313 VH" ], "locale_variants": {} }, { "sku": "NJG2314-VH", "brand": "SKF", "manufacturer_designation": "SKF NJG 2314 VH", "series": "NJG2300-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 150, "B_mm": 51, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 336, "static_load_kN": 400, "fatigue_load_limit_kN": 50, "max_rpm": 2200, "reference_speed_rpm": 1800, "limiting_speed_rpm": 2200, "weight_g": 4400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJG 2314 VH denotes a single-row full-complement cylindrical roller bearing on the ISO 15 70×150×51 mm envelope, dimension series 23 (medium-section, wide), with catalogue mass 4400 g. Reading the NJG prefix: a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling. This makes the execution one-direction locating: it positions the shaft axially in one direction and accommodates axial displacement in the opposite direction. Reading the order-string suffix VH: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 70 mm seat is about 4.80 kN/mm, typical of dimension series 23 (medium-section, wide); use C0 400 kN for static checks such as crane hook blocks standing under load. Fit practice for NJG2314-VH: low-speed duty only: the uncaged rollers smear when skidding, so keep minimum radial load high, accelerate gently and favour oil bath or grease with high base-oil viscosity. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "large gearbox slow-speed stages", "rolling-mill auxiliary shafts", "heavy conveyor pulley bearings", "wind turbine rotor-lock and yaw drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 2,200 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 51 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 150 mm raceway.", "The 336/400 kN ratings are SKF catalogue 17000 (2018) values for the VH execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJG2314-VH?", "a": "SKF NJG 2314 VH is a single-row full-complement cylindrical roller bearing with 70 mm bore, 150 mm OD and 51 mm width per ISO 15. SKF lists C 336 kN, C0 400 kN, Pu 50 kN, reference speed 1,800 r/min and limiting speed 2,200 r/min, mass about 4400 g." }, { "q": "What does the NJG designation and VH suffix mean?", "a": "Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling." }, { "q": "Can NJG2314-VH take axial load and locate the shaft?", "a": "In one direction; the opposite direction accommodates displacement. It is a low-speed full-complement bearing, not a high-speed thrust solution." }, { "q": "How does NJG2314-VH compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NJG2314", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJG2314-VH", "SKF NJG 2314 VH" ], "locale_variants": {} }, { "sku": "NJG2315-VH", "brand": "SKF", "manufacturer_designation": "SKF NJG 2315 VH", "series": "NJG2300-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 160, "B_mm": 55, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 396, "static_load_kN": 480, "fatigue_load_limit_kN": 60, "max_rpm": 2000, "reference_speed_rpm": 1600, "limiting_speed_rpm": 2000, "weight_g": 5350, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NJG 2315 VH resolves to a 75×160×55 mm single-row full-complement cylindrical roller bearing (dimension series 23 (medium-section, wide)); a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling. Reading the NJG prefix: a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling. This makes the execution one-direction locating: it positions the shaft axially in one direction and accommodates axial displacement in the opposite direction. Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. With C 396 kN and C0 480 kN, size the bearing on the 75×160 mm ISO 15 envelope and check the 60 kN Pu against the equivalent-load floor; the catalogue lists 1,600 r/min thermal reference speed and 2,000 r/min mechanical limiting speed. Mounting: low-speed duty only: the uncaged rollers smear when skidding, so keep minimum radial load high, accelerate gently and favour oil bath or grease with high base-oil viscosity. A 75 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "heavy conveyor pulley bearings", "wind turbine rotor-lock and yaw drives", "large gearbox slow-speed stages", "rolling-mill auxiliary shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 2,000 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 55 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 160 mm raceway.", "The 396/480 kN ratings are SKF catalogue 17000 (2018) values for the VH execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJG2315-VH?", "a": "SKF NJG 2315 VH is a single-row full-complement cylindrical roller bearing with 75 mm bore, 160 mm OD and 55 mm width per ISO 15. SKF lists C 396 kN, C0 480 kN, Pu 60 kN, reference speed 1,600 r/min and limiting speed 2,000 r/min, mass about 5350 g." }, { "q": "What does the NJG designation and VH suffix mean?", "a": "Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling." }, { "q": "Can NJG2315-VH take axial load and locate the shaft?", "a": "In one direction; the opposite direction accommodates displacement. It is a low-speed full-complement bearing, not a high-speed thrust solution." }, { "q": "How does NJG2315-VH compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NJG2315", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJG2315-VH", "SKF NJG 2315 VH" ], "locale_variants": {} }, { "sku": "NJG2316-VH", "brand": "SKF", "manufacturer_designation": "SKF NJG 2316 VH", "series": "NJG2300-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 170, "B_mm": 58, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 457, "static_load_kN": 570, "fatigue_load_limit_kN": 71, "max_rpm": 1900, "reference_speed_rpm": 1500, "limiting_speed_rpm": 1900, "weight_g": 6400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJG2316-VH is the 80 mm bore entry in the NJG2300 range: a 80×170×58 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 457 kN / C0 570 kN. Reading the NJG prefix: a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling. This makes the execution one-direction locating: it positions the shaft axially in one direction and accommodates axial displacement in the opposite direction. Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 80 mm seat is about 5.71 kN/mm, typical of dimension series 23 (medium-section, wide); use C0 570 kN for static checks such as crane hook blocks standing under load. Fit practice for NJG2316-VH: low-speed duty only: the uncaged rollers smear when skidding, so keep minimum radial load high, accelerate gently and favour oil bath or grease with high base-oil viscosity. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "wind turbine rotor-lock and yaw drives", "large gearbox slow-speed stages", "rolling-mill auxiliary shafts", "heavy conveyor pulley bearings" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 1,900 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 58 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 58 mm-wide ring and concentrates load.", "The 457/570 kN ratings are SKF catalogue 17000 (2018) values for the VH execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJG2316-VH?", "a": "SKF NJG 2316 VH is a single-row full-complement cylindrical roller bearing with 80 mm bore, 170 mm OD and 58 mm width per ISO 15. SKF lists C 457 kN, C0 570 kN, Pu 71 kN, reference speed 1,500 r/min and limiting speed 1,900 r/min, mass about 6400 g." }, { "q": "What does the NJG designation and VH suffix mean?", "a": "Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling." }, { "q": "Can NJG2316-VH take axial load and locate the shaft?", "a": "In one direction; the opposite direction accommodates displacement. It is a low-speed full-complement bearing, not a high-speed thrust solution." }, { "q": "How does NJG2316-VH compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NJG2316", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJG2316-VH", "SKF NJG 2316 VH" ], "locale_variants": {} }, { "sku": "NJG2317-VH", "brand": "SKF", "manufacturer_designation": "SKF NJG 2317 VH", "series": "NJG2300-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 180, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 484, "static_load_kN": 620, "fatigue_load_limit_kN": 76.5, "max_rpm": 1800, "reference_speed_rpm": 1400, "limiting_speed_rpm": 1800, "weight_g": 7400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 85 mm shaft, SKF lists NJG2317-VH as single-row full-complement cylindrical roller: 180 mm OD, 60 mm wide, Pu 76.5 kN, the catalogue lists 1,400 r/min thermal reference speed and 1,800 r/min mechanical limiting speed. Reading the NJG prefix: a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling. This makes the execution one-direction locating: it positions the shaft axially in one direction and accommodates axial displacement in the opposite direction. Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The radial section height is 47.5 mm and the catalogue mass 7400 g; at 484 kN dynamic rating this is roughly 5.69 kN of C per millimetre of bore before application factors. Assembly note: low-speed duty only: the uncaged rollers smear when skidding, so keep minimum radial load high, accelerate gently and favour oil bath or grease with high base-oil viscosity. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "large gearbox slow-speed stages", "rolling-mill auxiliary shafts", "heavy conveyor pulley bearings", "wind turbine rotor-lock and yaw drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 1,800 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 60 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 484/620 kN ratings are SKF catalogue 17000 (2018) values for the VH execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJG2317-VH?", "a": "SKF NJG 2317 VH is a single-row full-complement cylindrical roller bearing with 85 mm bore, 180 mm OD and 60 mm width per ISO 15. SKF lists C 484 kN, C0 620 kN, Pu 76.5 kN, reference speed 1,400 r/min and limiting speed 1,800 r/min, mass about 7400 g." }, { "q": "What does the NJG designation and VH suffix mean?", "a": "Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling." }, { "q": "Can NJG2317-VH take axial load and locate the shaft?", "a": "In one direction; the opposite direction accommodates displacement. It is a low-speed full-complement bearing, not a high-speed thrust solution." }, { "q": "How does NJG2317-VH compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NJG2317", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJG2317-VH", "SKF NJG 2317 VH" ], "locale_variants": {} }, { "sku": "NJG2318-VH", "brand": "SKF", "manufacturer_designation": "SKF NJG 2318 VH", "series": "NJG2300-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 190, "B_mm": 64, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 550, "static_load_kN": 680, "fatigue_load_limit_kN": 83, "max_rpm": 1700, "reference_speed_rpm": 1400, "limiting_speed_rpm": 1700, "weight_g": 8750, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NJG 2318 VH is a single-row full-complement cylindrical roller bearing sized 90×190×64 mm — a dimension series 23 (medium-section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. Reading the NJG prefix: a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling. This makes the execution one-direction locating: it positions the shaft axially in one direction and accommodates axial displacement in the opposite direction. Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Load-per-bore for the 90 mm seat is about 6.11 kN/mm, typical of dimension series 23 (medium-section, wide); use C0 680 kN for static checks such as crane hook blocks standing under load. Fit practice for NJG2318-VH: low-speed duty only: the uncaged rollers smear when skidding, so keep minimum radial load high, accelerate gently and favour oil bath or grease with high base-oil viscosity. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "heavy conveyor pulley bearings", "wind turbine rotor-lock and yaw drives", "large gearbox slow-speed stages", "rolling-mill auxiliary shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 1,700 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 64 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 550/680 kN ratings are SKF catalogue 17000 (2018) values for the VH execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJG2318-VH?", "a": "SKF NJG 2318 VH is a single-row full-complement cylindrical roller bearing with 90 mm bore, 190 mm OD and 64 mm width per ISO 15. SKF lists C 550 kN, C0 680 kN, Pu 83 kN, reference speed 1,400 r/min and limiting speed 1,700 r/min, mass about 8750 g." }, { "q": "What does the NJG designation and VH suffix mean?", "a": "Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling." }, { "q": "Can NJG2318-VH take axial load and locate the shaft?", "a": "In one direction; the opposite direction accommodates displacement. It is a low-speed full-complement bearing, not a high-speed thrust solution." }, { "q": "How does NJG2318-VH compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NJG2318", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJG2318-VH", "SKF NJG 2318 VH" ], "locale_variants": {} }, { "sku": "NJG2320-VH", "brand": "SKF", "manufacturer_designation": "SKF NJG 2320 VH", "series": "NJG2300-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 215, "B_mm": 73, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 704, "static_load_kN": 900, "fatigue_load_limit_kN": 106, "max_rpm": 1500, "reference_speed_rpm": 1200, "limiting_speed_rpm": 1500, "weight_g": 13000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJG2320-VH is the 100 mm bore entry in the NJG2300 range: a 100×215×73 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 704 kN / C0 900 kN. Structurally, the NJG design has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling. In arrangement terms it is one-direction locating: it positions the shaft axially in one direction and accommodates axial displacement in the opposite direction. Reading the order-string suffix VH: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. The radial section height is 57.5 mm and the catalogue mass 13000 g; at 704 kN dynamic rating this is roughly 7.04 kN of C per millimetre of bore before application factors. Fit practice for NJG2320-VH: low-speed duty only: the uncaged rollers smear when skidding, so keep minimum radial load high, accelerate gently and favour oil bath or grease with high base-oil viscosity. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "heavy conveyor pulley bearings", "wind turbine rotor-lock and yaw drives", "large gearbox slow-speed stages", "rolling-mill auxiliary shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 1,500 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 215 mm raceway.", "The 704/900 kN ratings are SKF catalogue 17000 (2018) values for the VH execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJG2320-VH?", "a": "SKF NJG 2320 VH is a single-row full-complement cylindrical roller bearing with 100 mm bore, 215 mm OD and 73 mm width per ISO 15. SKF lists C 704 kN, C0 900 kN, Pu 106 kN, reference speed 1,200 r/min and limiting speed 1,500 r/min, mass about 13000 g." }, { "q": "What does the NJG designation and VH suffix mean?", "a": "Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling." }, { "q": "Can NJG2320-VH take axial load and locate the shaft?", "a": "In one direction; the opposite direction accommodates displacement. It is a low-speed full-complement bearing, not a high-speed thrust solution." }, { "q": "How does NJG2320-VH compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NJG2320", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJG2320-VH", "SKF NJG 2320 VH" ], "locale_variants": {} }, { "sku": "NJG2322-VH", "brand": "SKF", "manufacturer_designation": "SKF NJG 2322 VH", "series": "NJG2300-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 240, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 858, "static_load_kN": 1060, "fatigue_load_limit_kN": 122, "max_rpm": 1300, "reference_speed_rpm": 1100, "limiting_speed_rpm": 1300, "weight_g": 17500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NJG 2322 VH is a single-row full-complement cylindrical roller bearing sized 110×240×80 mm — a dimension series 23 (medium-section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. Structurally, the NJG design has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling. In arrangement terms it is one-direction locating: it positions the shaft axially in one direction and accommodates axial displacement in the opposite direction. Reading the order-string suffix VH: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 1.24 (1060 against 858 kN), and the Pu figure 122 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 1,100 r/min thermal reference speed and 1,300 r/min mechanical limiting speed. Mounting: low-speed duty only: the uncaged rollers smear when skidding, so keep minimum radial load high, accelerate gently and favour oil bath or grease with high base-oil viscosity. A 110 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "large gearbox slow-speed stages", "rolling-mill auxiliary shafts", "heavy conveyor pulley bearings", "wind turbine rotor-lock and yaw drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 1,300 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 858/1060 kN ratings are SKF catalogue 17000 (2018) values for the VH execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJG2322-VH?", "a": "SKF NJG 2322 VH is a single-row full-complement cylindrical roller bearing with 110 mm bore, 240 mm OD and 80 mm width per ISO 15. SKF lists C 858 kN, C0 1060 kN, Pu 122 kN, reference speed 1,100 r/min and limiting speed 1,300 r/min, mass about 17500 g." }, { "q": "What does the NJG designation and VH suffix mean?", "a": "Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling." }, { "q": "Can NJG2322-VH take axial load and locate the shaft?", "a": "In one direction; the opposite direction accommodates displacement. It is a low-speed full-complement bearing, not a high-speed thrust solution." }, { "q": "How does NJG2322-VH compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NJG2322", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJG2322-VH", "SKF NJG 2322 VH" ], "locale_variants": {} }, { "sku": "NJG2324-VH", "brand": "SKF", "manufacturer_designation": "SKF NJG 2324 VH", "series": "NJG2300-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 260, "B_mm": 86, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 952, "static_load_kN": 1250, "fatigue_load_limit_kN": 140, "max_rpm": 1200, "reference_speed_rpm": 1000, "limiting_speed_rpm": 1200, "weight_g": 22500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NJG 2324 VH resolves to a 120×260×86 mm single-row full-complement cylindrical roller bearing (dimension series 23 (medium-section, wide)); a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling. Structurally, the NJG design has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling. In arrangement terms it is one-direction locating: it positions the shaft axially in one direction and accommodates axial displacement in the opposite direction. Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 1.31 (1250 against 952 kN), and the Pu figure 140 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 1,000 r/min thermal reference speed and 1,200 r/min mechanical limiting speed. Mounting: low-speed duty only: the uncaged rollers smear when skidding, so keep minimum radial load high, accelerate gently and favour oil bath or grease with high base-oil viscosity. A 120 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts", "heavy offshore winch drums" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 1,200 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 260 mm raceway.", "The 952/1250 kN ratings are SKF catalogue 17000 (2018) values for the VH execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJG2324-VH?", "a": "SKF NJG 2324 VH is a single-row full-complement cylindrical roller bearing with 120 mm bore, 260 mm OD and 86 mm width per ISO 15. SKF lists C 952 kN, C0 1250 kN, Pu 140 kN, reference speed 1,000 r/min and limiting speed 1,200 r/min, mass about 22500 g." }, { "q": "What does the NJG designation and VH suffix mean?", "a": "Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling." }, { "q": "Can NJG2324-VH take axial load and locate the shaft?", "a": "In one direction; the opposite direction accommodates displacement. It is a low-speed full-complement bearing, not a high-speed thrust solution." }, { "q": "How does NJG2324-VH compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NJG2324", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJG2324-VH", "SKF NJG 2324 VH" ], "locale_variants": {} }, { "sku": "NJG2326-VH", "brand": "SKF", "manufacturer_designation": "SKF NJG 2326 VH", "series": "NJG2300-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 280, "B_mm": 93, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1080, "static_load_kN": 1430, "fatigue_load_limit_kN": 156, "max_rpm": 1200, "reference_speed_rpm": 950, "limiting_speed_rpm": 1200, "weight_g": 28000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 130 mm shaft, SKF lists NJG2326-VH as single-row full-complement cylindrical roller: 280 mm OD, 93 mm wide, Pu 156 kN, the catalogue lists 950 r/min thermal reference speed and 1,200 r/min mechanical limiting speed. Structurally, the NJG design has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling. In arrangement terms it is one-direction locating: it positions the shaft axially in one direction and accommodates axial displacement in the opposite direction. Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 1.32 (1430 against 1080 kN), and the Pu figure 156 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 950 r/min thermal reference speed and 1,200 r/min mechanical limiting speed. Mounting: low-speed duty only: the uncaged rollers smear when skidding, so keep minimum radial load high, accelerate gently and favour oil bath or grease with high base-oil viscosity. A 130 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "heavy offshore winch drums", "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 1,200 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 93 mm-wide ring and concentrates load.", "The 1080/1430 kN ratings are SKF catalogue 17000 (2018) values for the VH execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJG2326-VH?", "a": "SKF NJG 2326 VH is a single-row full-complement cylindrical roller bearing with 130 mm bore, 280 mm OD and 93 mm width per ISO 15. SKF lists C 1080 kN, C0 1430 kN, Pu 156 kN, reference speed 950 r/min and limiting speed 1,200 r/min, mass about 28000 g." }, { "q": "What does the NJG designation and VH suffix mean?", "a": "Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling." }, { "q": "Can NJG2326-VH take axial load and locate the shaft?", "a": "In one direction; the opposite direction accommodates displacement. It is a low-speed full-complement bearing, not a high-speed thrust solution." }, { "q": "How does NJG2326-VH compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NJG2326", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJG2326-VH", "SKF NJG 2326 VH" ], "locale_variants": {} }, { "sku": "NJG2328-VH", "brand": "SKF", "manufacturer_designation": "SKF NJG 2328 VH", "series": "NJG2300-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 300, "B_mm": 102, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1230, "static_load_kN": 1660, "fatigue_load_limit_kN": 180, "max_rpm": 1100, "reference_speed_rpm": 850, "limiting_speed_rpm": 1100, "weight_g": 35500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NJG 2328 VH denotes a single-row full-complement cylindrical roller bearing on the ISO 15 140×300×102 mm envelope, dimension series 23 (medium-section, wide), with catalogue mass 35500 g. Structurally, the NJG design has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling. In arrangement terms it is one-direction locating: it positions the shaft axially in one direction and accommodates axial displacement in the opposite direction. Reading the order-string suffix VH: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 1.35 (1660 against 1230 kN), and the Pu figure 180 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 850 r/min thermal reference speed and 1,100 r/min mechanical limiting speed. Mounting: low-speed duty only: the uncaged rollers smear when skidding, so keep minimum radial load high, accelerate gently and favour oil bath or grease with high base-oil viscosity. A 140 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "mining crusher eccentric shafts", "heavy offshore winch drums", "large rolling-mill and continuous-caster drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 1,100 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 1230/1660 kN ratings are SKF catalogue 17000 (2018) values for the VH execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJG2328-VH?", "a": "SKF NJG 2328 VH is a single-row full-complement cylindrical roller bearing with 140 mm bore, 300 mm OD and 102 mm width per ISO 15. SKF lists C 1230 kN, C0 1660 kN, Pu 180 kN, reference speed 850 r/min and limiting speed 1,100 r/min, mass about 35500 g." }, { "q": "What does the NJG designation and VH suffix mean?", "a": "Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling." }, { "q": "Can NJG2328-VH take axial load and locate the shaft?", "a": "In one direction; the opposite direction accommodates displacement. It is a low-speed full-complement bearing, not a high-speed thrust solution." }, { "q": "How does NJG2328-VH compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NJG2328", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJG2328-VH", "SKF NJG 2328 VH" ], "locale_variants": {} }, { "sku": "NJG2330-VH", "brand": "SKF", "manufacturer_designation": "SKF NJG 2330 VH", "series": "NJG2300-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 320, "B_mm": 108, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1450, "static_load_kN": 1930, "fatigue_load_limit_kN": 196, "max_rpm": 1000, "reference_speed_rpm": 800, "limiting_speed_rpm": 1000, "weight_g": 42500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 150 mm shaft, SKF lists NJG2330-VH as single-row full-complement cylindrical roller: 320 mm OD, 108 mm wide, Pu 196 kN, the catalogue lists 800 r/min thermal reference speed and 1,000 r/min mechanical limiting speed. The NJG configuration means a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling; functionally the bearing is one-direction locating: it positions the shaft axially in one direction and accommodates axial displacement in the opposite direction. Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. With C 1450 kN and C0 1930 kN, size the bearing on the 150×320 mm ISO 15 envelope and check the 196 kN Pu against the equivalent-load floor; the catalogue lists 800 r/min thermal reference speed and 1,000 r/min mechanical limiting speed. Mounting: low-speed duty only: the uncaged rollers smear when skidding, so keep minimum radial load high, accelerate gently and favour oil bath or grease with high base-oil viscosity. A 150 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "mining crusher eccentric shafts", "heavy offshore winch drums", "large rolling-mill and continuous-caster drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 1,000 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 320 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 320 mm raceway.", "The 1450/1930 kN ratings are SKF catalogue 17000 (2018) values for the VH execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJG2330-VH?", "a": "SKF NJG 2330 VH is a single-row full-complement cylindrical roller bearing with 150 mm bore, 320 mm OD and 108 mm width per ISO 15. SKF lists C 1450 kN, C0 1930 kN, Pu 196 kN, reference speed 800 r/min and limiting speed 1,000 r/min, mass about 42500 g." }, { "q": "What does the NJG designation and VH suffix mean?", "a": "Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling." }, { "q": "Can NJG2330-VH take axial load and locate the shaft?", "a": "In one direction; the opposite direction accommodates displacement. It is a low-speed full-complement bearing, not a high-speed thrust solution." }, { "q": "How does NJG2330-VH compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NJG2330", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJG2330-VH", "SKF NJG 2330 VH" ], "locale_variants": {} }, { "sku": "NJG2334-VH", "brand": "SKF", "manufacturer_designation": "SKF NJG 2334 VH", "series": "NJG2300-series", "type": "cylindrical_roller", "d_mm": 170, "D_mm": 360, "B_mm": 120, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1760, "static_load_kN": 2450, "fatigue_load_limit_kN": 236, "max_rpm": 900, "reference_speed_rpm": 700, "limiting_speed_rpm": 900, "weight_g": 59500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJG2334-VH is the 170 mm bore entry in the NJG2300 range: a 170×360×120 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 1760 kN / C0 2450 kN. The NJG configuration means a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling; functionally the bearing is one-direction locating: it positions the shaft axially in one direction and accommodates axial displacement in the opposite direction. Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. The radial section height is 95.0 mm and the catalogue mass 59500 g; at 1760 kN dynamic rating this is roughly 10.35 kN of C per millimetre of bore before application factors. Assembly note: low-speed duty only: the uncaged rollers smear when skidding, so keep minimum radial load high, accelerate gently and favour oil bath or grease with high base-oil viscosity. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "mining crusher eccentric shafts", "heavy offshore winch drums", "large rolling-mill and continuous-caster drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 900 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 360 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 360 mm raceway.", "The 1760/2450 kN ratings are SKF catalogue 17000 (2018) values for the VH execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJG2334-VH?", "a": "SKF NJG 2334 VH is a single-row full-complement cylindrical roller bearing with 170 mm bore, 360 mm OD and 120 mm width per ISO 15. SKF lists C 1760 kN, C0 2450 kN, Pu 236 kN, reference speed 700 r/min and limiting speed 900 r/min, mass about 59500 g." }, { "q": "What does the NJG designation and VH suffix mean?", "a": "Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling." }, { "q": "Can NJG2334-VH take axial load and locate the shaft?", "a": "In one direction; the opposite direction accommodates displacement. It is a low-speed full-complement bearing, not a high-speed thrust solution." }, { "q": "How does NJG2334-VH compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NJG2334", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJG2334-VH", "SKF NJG 2334 VH" ], "locale_variants": {} }, { "sku": "NJG2336-VH", "brand": "SKF", "manufacturer_designation": "SKF NJG 2336 VH", "series": "NJG2300-series", "type": "cylindrical_roller", "d_mm": 180, "D_mm": 380, "B_mm": 126, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1870, "static_load_kN": 2650, "fatigue_load_limit_kN": 255, "max_rpm": 800, "reference_speed_rpm": 670, "limiting_speed_rpm": 800, "weight_g": 69500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NJG 2336 VH is a single-row full-complement cylindrical roller bearing sized 180×380×126 mm — a dimension series 23 (medium-section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.3. The NJG configuration means a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling; functionally the bearing is one-direction locating: it positions the shaft axially in one direction and accommodates axial displacement in the opposite direction. Reading the order-string suffix VH: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. The radial section height is 100.0 mm and the catalogue mass 69500 g; at 1870 kN dynamic rating this is roughly 10.39 kN of C per millimetre of bore before application factors. Assembly note: low-speed duty only: the uncaged rollers smear when skidding, so keep minimum radial load high, accelerate gently and favour oil bath or grease with high base-oil viscosity. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts", "heavy offshore winch drums" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 800 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 380 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 126 mm-wide ring and concentrates load.", "The 1870/2650 kN ratings are SKF catalogue 17000 (2018) values for the VH execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJG2336-VH?", "a": "SKF NJG 2336 VH is a single-row full-complement cylindrical roller bearing with 180 mm bore, 380 mm OD and 126 mm width per ISO 15. SKF lists C 1870 kN, C0 2650 kN, Pu 255 kN, reference speed 670 r/min and limiting speed 800 r/min, mass about 69500 g." }, { "q": "What does the NJG designation and VH suffix mean?", "a": "Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling." }, { "q": "Can NJG2336-VH take axial load and locate the shaft?", "a": "In one direction; the opposite direction accommodates displacement. It is a low-speed full-complement bearing, not a high-speed thrust solution." }, { "q": "How does NJG2336-VH compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NJG2336", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJG2336-VH", "SKF NJG 2336 VH" ], "locale_variants": {} }, { "sku": "NJG2338-VH", "brand": "SKF", "manufacturer_designation": "SKF NJG 2338 VH", "series": "NJG2300-series", "type": "cylindrical_roller", "d_mm": 190, "D_mm": 400, "B_mm": 132, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 2160, "static_load_kN": 3000, "fatigue_load_limit_kN": 280, "max_rpm": 800, "reference_speed_rpm": 630, "limiting_speed_rpm": 800, "weight_g": 80000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NJG 2338 VH resolves to a 190×400×132 mm single-row full-complement cylindrical roller bearing (dimension series 23 (medium-section, wide)); a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling. The NJG configuration means a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling; functionally the bearing is one-direction locating: it positions the shaft axially in one direction and accommodates axial displacement in the opposite direction. Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The radial section height is 105.0 mm and the catalogue mass 80000 g; at 2160 kN dynamic rating this is roughly 11.37 kN of C per millimetre of bore before application factors. Assembly note: low-speed duty only: the uncaged rollers smear when skidding, so keep minimum radial load high, accelerate gently and favour oil bath or grease with high base-oil viscosity. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "heavy offshore winch drums", "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 800 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 400 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 2160/3000 kN ratings are SKF catalogue 17000 (2018) values for the VH execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJG2338-VH?", "a": "SKF NJG 2338 VH is a single-row full-complement cylindrical roller bearing with 190 mm bore, 400 mm OD and 132 mm width per ISO 15. SKF lists C 2160 kN, C0 3000 kN, Pu 280 kN, reference speed 630 r/min and limiting speed 800 r/min, mass about 80000 g." }, { "q": "What does the NJG designation and VH suffix mean?", "a": "Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling." }, { "q": "Can NJG2338-VH take axial load and locate the shaft?", "a": "In one direction; the opposite direction accommodates displacement. It is a low-speed full-complement bearing, not a high-speed thrust solution." }, { "q": "How does NJG2338-VH compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NJG2338", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJG2338-VH", "SKF NJG 2338 VH" ], "locale_variants": {} }, { "sku": "NJG2340-VH", "brand": "SKF", "manufacturer_designation": "SKF NJG 2340 VH", "series": "NJG2300-series", "type": "cylindrical_roller", "d_mm": 200, "D_mm": 420, "B_mm": 138, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 2290, "static_load_kN": 3200, "fatigue_load_limit_kN": 290, "max_rpm": 750, "reference_speed_rpm": 600, "limiting_speed_rpm": 750, "weight_g": 92000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 200 mm shaft, SKF lists NJG2340-VH as single-row full-complement cylindrical roller: 420 mm OD, 138 mm wide, Pu 290 kN, the catalogue lists 600 r/min thermal reference speed and 750 r/min mechanical limiting speed. Structurally, the NJG design has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling. In arrangement terms it is one-direction locating: it positions the shaft axially in one direction and accommodates axial displacement in the opposite direction. Reading the order-string suffix VH: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 200 mm seat is about 11.45 kN/mm, typical of dimension series 23 (medium-section, wide); use C0 3200 kN for static checks such as crane hook blocks standing under load. Fit practice for NJG2340-VH: low-speed duty only: the uncaged rollers smear when skidding, so keep minimum radial load high, accelerate gently and favour oil bath or grease with high base-oil viscosity. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts", "heavy offshore winch drums" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 750 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 420 mm raceway.", "The 2290/3200 kN ratings are SKF catalogue 17000 (2018) values for the VH execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJG2340-VH?", "a": "SKF NJG 2340 VH is a single-row full-complement cylindrical roller bearing with 200 mm bore, 420 mm OD and 138 mm width per ISO 15. SKF lists C 2290 kN, C0 3200 kN, Pu 290 kN, reference speed 600 r/min and limiting speed 750 r/min, mass about 92000 g." }, { "q": "What does the NJG designation and VH suffix mean?", "a": "Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling." }, { "q": "Can NJG2340-VH take axial load and locate the shaft?", "a": "In one direction; the opposite direction accommodates displacement. It is a low-speed full-complement bearing, not a high-speed thrust solution." }, { "q": "How does NJG2340-VH compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NJG2340", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJG2340-VH", "SKF NJG 2340 VH" ], "locale_variants": {} }, { "sku": "NJG2344-VH", "brand": "SKF", "manufacturer_designation": "SKF NJG 2344 VH", "series": "NJG2300-series", "type": "cylindrical_roller", "d_mm": 220, "D_mm": 460, "B_mm": 145, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 2700, "static_load_kN": 3750, "fatigue_load_limit_kN": 335, "max_rpm": 670, "reference_speed_rpm": 530, "limiting_speed_rpm": 670, "weight_g": 111000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJG2344-VH is the 220 mm bore entry in the NJG2300 range: a 220×460×145 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 2700 kN / C0 3750 kN. Reading the NJG prefix: a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling. This makes the execution one-direction locating: it positions the shaft axially in one direction and accommodates axial displacement in the opposite direction. Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. With C 2700 kN and C0 3750 kN, size the bearing on the 220×460 mm ISO 15 envelope and check the 335 kN Pu against the equivalent-load floor; the catalogue lists 530 r/min thermal reference speed and 670 r/min mechanical limiting speed. Mounting: low-speed duty only: the uncaged rollers smear when skidding, so keep minimum radial load high, accelerate gently and favour oil bath or grease with high base-oil viscosity. A 220 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "heavy offshore winch drums", "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 670 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 145 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 460 mm raceway.", "The 2700/3750 kN ratings are SKF catalogue 17000 (2018) values for the VH execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJG2344-VH?", "a": "SKF NJG 2344 VH is a single-row full-complement cylindrical roller bearing with 220 mm bore, 460 mm OD and 145 mm width per ISO 15. SKF lists C 2700 kN, C0 3750 kN, Pu 335 kN, reference speed 530 r/min and limiting speed 670 r/min, mass about 111000 g." }, { "q": "What does the NJG designation and VH suffix mean?", "a": "Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling." }, { "q": "Can NJG2344-VH take axial load and locate the shaft?", "a": "In one direction; the opposite direction accommodates displacement. It is a low-speed full-complement bearing, not a high-speed thrust solution." }, { "q": "How does NJG2344-VH compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NJG2344", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJG2344-VH", "SKF NJG 2344 VH" ], "locale_variants": {} }, { "sku": "NJG2348-VH", "brand": "SKF", "manufacturer_designation": "SKF NJG 2348 VH", "series": "NJG2300-series", "type": "cylindrical_roller", "d_mm": 240, "D_mm": 500, "B_mm": 155, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 3140, "static_load_kN": 4400, "fatigue_load_limit_kN": 390, "max_rpm": 600, "reference_speed_rpm": 480, "limiting_speed_rpm": 600, "weight_g": 147000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NJG 2348 VH resolves to a 240×500×155 mm single-row full-complement cylindrical roller bearing (dimension series 23 (medium-section, wide)); a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling. Reading the NJG prefix: a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling. This makes the execution one-direction locating: it positions the shaft axially in one direction and accommodates axial displacement in the opposite direction. Reading the order-string suffix VH: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. With C 3140 kN and C0 4400 kN, size the bearing on the 240×500 mm ISO 15 envelope and check the 390 kN Pu against the equivalent-load floor; the catalogue lists 480 r/min thermal reference speed and 600 r/min mechanical limiting speed. Mounting: low-speed duty only: the uncaged rollers smear when skidding, so keep minimum radial load high, accelerate gently and favour oil bath or grease with high base-oil viscosity. A 240 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts", "heavy offshore winch drums" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 600 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 155 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 3140/4400 kN ratings are SKF catalogue 17000 (2018) values for the VH execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJG2348-VH?", "a": "SKF NJG 2348 VH is a single-row full-complement cylindrical roller bearing with 240 mm bore, 500 mm OD and 155 mm width per ISO 15. SKF lists C 3140 kN, C0 4400 kN, Pu 390 kN, reference speed 480 r/min and limiting speed 600 r/min, mass about 147000 g." }, { "q": "What does the NJG designation and VH suffix mean?", "a": "Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling." }, { "q": "Can NJG2348-VH take axial load and locate the shaft?", "a": "In one direction; the opposite direction accommodates displacement. It is a low-speed full-complement bearing, not a high-speed thrust solution." }, { "q": "How does NJG2348-VH compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NJG2348", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJG2348-VH", "SKF NJG 2348 VH" ], "locale_variants": {} }, { "sku": "NJG2352-VH", "brand": "SKF", "manufacturer_designation": "SKF NJG 2352 VH", "series": "NJG2300-series", "type": "cylindrical_roller", "d_mm": 260, "D_mm": 540, "B_mm": 165, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 3580, "static_load_kN": 5000, "fatigue_load_limit_kN": 430, "max_rpm": 530, "reference_speed_rpm": 430, "limiting_speed_rpm": 530, "weight_g": 177000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NJG 2352 VH resolves to a 260×540×165 mm single-row full-complement cylindrical roller bearing (dimension series 23 (medium-section, wide)); a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling. The NJG configuration means a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling; functionally the bearing is one-direction locating: it positions the shaft axially in one direction and accommodates axial displacement in the opposite direction. Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 260 mm seat is about 13.77 kN/mm, typical of dimension series 23 (medium-section, wide); use C0 5000 kN for static checks such as crane hook blocks standing under load. Assembly note: low-speed duty only: the uncaged rollers smear when skidding, so keep minimum radial load high, accelerate gently and favour oil bath or grease with high base-oil viscosity. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "heavy offshore winch drums", "large rolling-mill and continuous-caster drives", "mining crusher eccentric shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 530 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 540 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 3580/5000 kN ratings are SKF catalogue 17000 (2018) values for the VH execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJG2352-VH?", "a": "SKF NJG 2352 VH is a single-row full-complement cylindrical roller bearing with 260 mm bore, 540 mm OD and 165 mm width per ISO 15. SKF lists C 3580 kN, C0 5000 kN, Pu 430 kN, reference speed 430 r/min and limiting speed 530 r/min, mass about 177000 g." }, { "q": "What does the NJG designation and VH suffix mean?", "a": "Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling." }, { "q": "Can NJG2352-VH take axial load and locate the shaft?", "a": "In one direction; the opposite direction accommodates displacement. It is a low-speed full-complement bearing, not a high-speed thrust solution." }, { "q": "How does NJG2352-VH compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NJG2352", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJG2352-VH", "SKF NJG 2352 VH" ], "locale_variants": {} }, { "sku": "NJG309-VH", "brand": "SKF", "manufacturer_designation": "SKF NJG 309 VH", "series": "NJG300-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 100, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 110, "static_load_kN": 112, "fatigue_load_limit_kN": 14, "max_rpm": 9000, "reference_speed_rpm": 7500, "limiting_speed_rpm": 9000, "weight_g": 940, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NJG309-VH is the 45 mm bore entry in the NJG300 range: a 45×100×25 mm single-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 110 kN / C0 112 kN. Reading the NJG prefix: a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling. This makes the execution one-direction locating: it positions the shaft axially in one direction and accommodates axial displacement in the opposite direction. Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 1.02 (112 against 110 kN), and the Pu figure 14 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 7,500 r/min thermal reference speed and 9,000 r/min mechanical limiting speed. Assembly note: low-speed duty only: the uncaged rollers smear when skidding, so keep minimum radial load high, accelerate gently and favour oil bath or grease with high base-oil viscosity. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "crane travel-wheel bearings", "rolling-mill table rollers", "slew and swing drives", "heavy gearbox output shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing (microwelding) in the full complement during skidding at light load or rapid acceleration", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge loading and roller-end scoring when the minimum radial load is not maintained at standstill", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "Full-complement bearings trade speed for capacity: the 9,000 r/min ceiling is far below a caged bearing of the same envelope, and running faster smears the uncaged rollers.", "Keep minimum radial load high (typically ≥0,02 C) for a full-complement unit; at light load the rollers skid and microweld within the first service interval.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 25 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 100 mm raceway.", "The 110/112 kN ratings are SKF catalogue 17000 (2018) values for the VH execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NJG309-VH?", "a": "SKF NJG 309 VH is a single-row full-complement cylindrical roller bearing with 45 mm bore, 100 mm OD and 25 mm width per ISO 15. SKF lists C 110 kN, C0 112 kN, Pu 14 kN, reference speed 7,500 r/min and limiting speed 9,000 r/min, mass about 940 g." }, { "q": "What does the NJG designation and VH suffix mean?", "a": "Suffix VH identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a single-row full complement bearing with two integral flanges on the outer ring and one on the inner ring; the roller set is self-retaining and the outer ring can be lifted off without rollers spilling." }, { "q": "Can NJG309-VH take axial load and locate the shaft?", "a": "In one direction; the opposite direction accommodates displacement. It is a low-speed full-complement bearing, not a high-speed thrust solution." }, { "q": "How does NJG309-VH compare with the other executions in the same envelope?", "a": "The full-complement NCF/NJG bearings replace the cage with extra rollers for higher radial capacity and stiffness at a substantially lower speed than caged bearings." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NJG309", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.3 single-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NJG309-VH", "SKF NJG 309 VH" ], "locale_variants": {} }, { "sku": "NNC4830-CV", "brand": "SKF", "manufacturer_designation": "SKF NNC 4830 CV", "series": "NNC4800-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 190, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 255, "static_load_kN": 585, "fatigue_load_limit_kN": 60, "max_rpm": 1800, "reference_speed_rpm": 1500, "limiting_speed_rpm": 1800, "weight_g": 2900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NNC 4830 CV denotes a double-row full-complement cylindrical roller bearing on the ISO 15 150×190×40 mm envelope, dimension series 48 (compact heavy section), with catalogue mass 2900 g. Structurally, the NNC design has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. In arrangement terms it is two-direction locating — the retaining-ring configuration closes both axial escape paths. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Load-per-bore for the 150 mm seat is about 1.70 kN/mm, typical of dimension series 48 (compact heavy section); use C0 585 kN for static checks such as crane hook blocks standing under load. Fit practice for NNC4830-CV: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "large offshore winch and hook blocks", "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 255/585 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNC4830-CV?", "a": "SKF NNC 4830 CV is a double-row full-complement cylindrical roller bearing with 150 mm bore, 190 mm OD and 40 mm width per ISO 15. SKF lists C 255 kN, C0 585 kN, Pu 60 kN, reference speed 1,500 r/min and limiting speed 1,800 r/min, mass about 2900 g." }, { "q": "What does the NNC designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides." }, { "q": "Can NNC4830-CV take axial load and locate the shaft?", "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float." }, { "q": "How does NNC4830-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNCF4830-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 150×190×40 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4830-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 150×190×40 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNC4830-CV", "SKF NNC 4830 CV" ], "locale_variants": {} }, { "sku": "NNC4832-CV", "brand": "SKF", "manufacturer_designation": "SKF NNC 4832 CV", "series": "NNC4800-series", "type": "cylindrical_roller", "d_mm": 160, "D_mm": 200, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 260, "static_load_kN": 610, "fatigue_load_limit_kN": 62, "max_rpm": 1700, "reference_speed_rpm": 1400, "limiting_speed_rpm": 1700, "weight_g": 3100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NNC 4832 CV resolves to a 160×200×40 mm double-row full-complement cylindrical roller bearing (dimension series 48 (compact heavy section)); a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. Structurally, the NNC design has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. In arrangement terms it is two-direction locating — the retaining-ring configuration closes both axial escape paths. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 160 mm seat is about 1.63 kN/mm, typical of dimension series 48 (compact heavy section); use C0 610 kN for static checks such as crane hook blocks standing under load. Mounting: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. A 160 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks", "mining shovel and dragline pivots" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 200 mm raceway.", "The 260/610 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNC4832-CV?", "a": "SKF NNC 4832 CV is a double-row full-complement cylindrical roller bearing with 160 mm bore, 200 mm OD and 40 mm width per ISO 15. SKF lists C 260 kN, C0 610 kN, Pu 62 kN, reference speed 1,400 r/min and limiting speed 1,700 r/min, mass about 3100 g." }, { "q": "What does the NNC designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides." }, { "q": "Can NNC4832-CV take axial load and locate the shaft?", "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float." }, { "q": "How does NNC4832-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNCF4832-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 160×200×40 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4832-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 160×200×40 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNC4832-CV", "SKF NNC 4832 CV" ], "locale_variants": {} }, { "sku": "NNC4834-CV", "brand": "SKF", "manufacturer_designation": "SKF NNC 4834 CV", "series": "NNC4800-series", "type": "cylindrical_roller", "d_mm": 170, "D_mm": 215, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 286, "static_load_kN": 655, "fatigue_load_limit_kN": 65.5, "max_rpm": 1600, "reference_speed_rpm": 1300, "limiting_speed_rpm": 1600, "weight_g": 4000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 170 mm shaft, SKF lists NNC4834-CV as double-row full-complement cylindrical roller: 215 mm OD, 45 mm wide, Pu 65.5 kN, the catalogue lists 1,300 r/min thermal reference speed and 1,600 r/min mechanical limiting speed. Structurally, the NNC design has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. In arrangement terms it is two-direction locating — the retaining-ring configuration closes both axial escape paths. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Load-per-bore for the 170 mm seat is about 1.68 kN/mm, typical of dimension series 48 (compact heavy section); use C0 655 kN for static checks such as crane hook blocks standing under load. Mounting: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. A 170 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 45 mm-wide ring and concentrates load.", "The 286/655 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNC4834-CV?", "a": "SKF NNC 4834 CV is a double-row full-complement cylindrical roller bearing with 170 mm bore, 215 mm OD and 45 mm width per ISO 15. SKF lists C 286 kN, C0 655 kN, Pu 65.5 kN, reference speed 1,300 r/min and limiting speed 1,600 r/min, mass about 4000 g." }, { "q": "What does the NNC designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides." }, { "q": "Can NNC4834-CV take axial load and locate the shaft?", "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float." }, { "q": "How does NNC4834-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNCF4834-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 170×215×45 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4834-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 170×215×45 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNC4834-CV", "SKF NNC 4834 CV" ], "locale_variants": {} }, { "sku": "NNC4836-CV", "brand": "SKF", "manufacturer_designation": "SKF NNC 4836 CV", "series": "NNC4800-series", "type": "cylindrical_roller", "d_mm": 180, "D_mm": 225, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 297, "static_load_kN": 695, "fatigue_load_limit_kN": 69.5, "max_rpm": 1500, "reference_speed_rpm": 1200, "limiting_speed_rpm": 1500, "weight_g": 4300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NNC 4836 CV denotes a double-row full-complement cylindrical roller bearing on the ISO 15 180×225×45 mm envelope, dimension series 48 (compact heavy section), with catalogue mass 4300 g. Structurally, the NNC design has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. In arrangement terms it is two-direction locating — the retaining-ring configuration closes both axial escape paths. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 180 mm seat is about 1.65 kN/mm, typical of dimension series 48 (compact heavy section); use C0 695 kN for static checks such as crane hook blocks standing under load. Mounting: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. A 180 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "large offshore winch and hook blocks", "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 297/695 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNC4836-CV?", "a": "SKF NNC 4836 CV is a double-row full-complement cylindrical roller bearing with 180 mm bore, 225 mm OD and 45 mm width per ISO 15. SKF lists C 297 kN, C0 695 kN, Pu 69.5 kN, reference speed 1,200 r/min and limiting speed 1,500 r/min, mass about 4300 g." }, { "q": "What does the NNC designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides." }, { "q": "Can NNC4836-CV take axial load and locate the shaft?", "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float." }, { "q": "How does NNC4836-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNCF4836-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 180×225×45 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4836-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 180×225×45 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNC4836-CV", "SKF NNC 4836 CV" ], "locale_variants": {} }, { "sku": "NNC4838-CV", "brand": "SKF", "manufacturer_designation": "SKF NNC 4838 CV", "series": "NNC4800-series", "type": "cylindrical_roller", "d_mm": 190, "D_mm": 240, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 358, "static_load_kN": 750, "fatigue_load_limit_kN": 76.5, "max_rpm": 1400, "reference_speed_rpm": 1100, "limiting_speed_rpm": 1400, "weight_g": 5650, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NNC4838-CV is the 190 mm bore entry in the NNC4800 range: a 190×240×50 mm double-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 358 kN / C0 750 kN. Structurally, the NNC design has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. In arrangement terms it is two-direction locating — the retaining-ring configuration closes both axial escape paths. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Speed planning for NNC4838-CV: the catalogue lists 1,100 r/min thermal reference speed and 1,400 r/min mechanical limiting speed. The mass entry 5650 g covers the complete catalogue execution. Assembly note: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 50 mm-wide ring and concentrates load.", "The 358/750 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNC4838-CV?", "a": "SKF NNC 4838 CV is a double-row full-complement cylindrical roller bearing with 190 mm bore, 240 mm OD and 50 mm width per ISO 15. SKF lists C 358 kN, C0 750 kN, Pu 76.5 kN, reference speed 1,100 r/min and limiting speed 1,400 r/min, mass about 5650 g." }, { "q": "What does the NNC designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides." }, { "q": "Can NNC4838-CV take axial load and locate the shaft?", "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float." }, { "q": "How does NNC4838-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNCF4838-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 190×240×50 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4838-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 190×240×50 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNC4838-CV", "SKF NNC 4838 CV" ], "locale_variants": {} }, { "sku": "NNC4840-CV", "brand": "SKF", "manufacturer_designation": "SKF NNC 4840 CV", "series": "NNC4800-series", "type": "cylindrical_roller", "d_mm": 200, "D_mm": 250, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 369, "static_load_kN": 800, "fatigue_load_limit_kN": 80, "max_rpm": 1400, "reference_speed_rpm": 1100, "limiting_speed_rpm": 1400, "weight_g": 5900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NNC 4840 CV denotes a double-row full-complement cylindrical roller bearing on the ISO 15 200×250×50 mm envelope, dimension series 48 (compact heavy section), with catalogue mass 5900 g. The NNC configuration means a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides; functionally the bearing is two-direction locating — the retaining-ring configuration closes both axial escape paths. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 2.17 (800 against 369 kN), and the Pu figure 80 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 1,100 r/min thermal reference speed and 1,400 r/min mechanical limiting speed. Assembly note: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 250 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 369/800 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNC4840-CV?", "a": "SKF NNC 4840 CV is a double-row full-complement cylindrical roller bearing with 200 mm bore, 250 mm OD and 50 mm width per ISO 15. SKF lists C 369 kN, C0 800 kN, Pu 80 kN, reference speed 1,100 r/min and limiting speed 1,400 r/min, mass about 5900 g." }, { "q": "What does the NNC designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides." }, { "q": "Can NNC4840-CV take axial load and locate the shaft?", "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float." }, { "q": "How does NNC4840-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNCF4840-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 200×250×50 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4840-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 200×250×50 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNC4840-CV", "SKF NNC 4840 CV" ], "locale_variants": {} }, { "sku": "NNC4844-CV", "brand": "SKF", "manufacturer_designation": "SKF NNC 4844 CV", "series": "NNC4800-series", "type": "cylindrical_roller", "d_mm": 220, "D_mm": 270, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 380, "static_load_kN": 865, "fatigue_load_limit_kN": 85, "max_rpm": 1200, "reference_speed_rpm": 1000, "limiting_speed_rpm": 1200, "weight_g": 6400, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NNC 4844 CV is a double-row full-complement cylindrical roller bearing sized 220×270×50 mm — a dimension series 48 (compact heavy section), listed in SKF catalogue PUB BU/P1 17000 ch. 6.4. The NNC configuration means a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides; functionally the bearing is two-direction locating — the retaining-ring configuration closes both axial escape paths. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 2.28 (865 against 380 kN), and the Pu figure 85 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 1,000 r/min thermal reference speed and 1,200 r/min mechanical limiting speed. Assembly note: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks", "mining shovel and dragline pivots" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 270 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 50 mm-wide ring and concentrates load.", "The 380/865 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNC4844-CV?", "a": "SKF NNC 4844 CV is a double-row full-complement cylindrical roller bearing with 220 mm bore, 270 mm OD and 50 mm width per ISO 15. SKF lists C 380 kN, C0 865 kN, Pu 85 kN, reference speed 1,000 r/min and limiting speed 1,200 r/min, mass about 6400 g." }, { "q": "What does the NNC designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides." }, { "q": "Can NNC4844-CV take axial load and locate the shaft?", "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float." }, { "q": "How does NNC4844-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNCF4844-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 220×270×50 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4844-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 220×270×50 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNC4844-CV", "SKF NNC 4844 CV" ], "locale_variants": {} }, { "sku": "NNC4848-CV", "brand": "SKF", "manufacturer_designation": "SKF NNC 4848 CV", "series": "NNC4800-series", "type": "cylindrical_roller", "d_mm": 240, "D_mm": 300, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 539, "static_load_kN": 1290, "fatigue_load_limit_kN": 125, "max_rpm": 1100, "reference_speed_rpm": 900, "limiting_speed_rpm": 1100, "weight_g": 10000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 240 mm shaft, SKF lists NNC4848-CV as double-row full-complement cylindrical roller: 300 mm OD, 60 mm wide, Pu 125 kN, the catalogue lists 900 r/min thermal reference speed and 1,100 r/min mechanical limiting speed. The NNC configuration means a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides; functionally the bearing is two-direction locating — the retaining-ring configuration closes both axial escape paths. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 240 mm seat is about 2.25 kN/mm, typical of dimension series 48 (compact heavy section); use C0 1290 kN for static checks such as crane hook blocks standing under load. Fit practice for NNC4848-CV: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks", "mining shovel and dragline pivots" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 300 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 60 mm-wide ring and concentrates load.", "The 539/1290 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNC4848-CV?", "a": "SKF NNC 4848 CV is a double-row full-complement cylindrical roller bearing with 240 mm bore, 300 mm OD and 60 mm width per ISO 15. SKF lists C 539 kN, C0 1290 kN, Pu 125 kN, reference speed 900 r/min and limiting speed 1,100 r/min, mass about 10000 g." }, { "q": "What does the NNC designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides." }, { "q": "Can NNC4848-CV take axial load and locate the shaft?", "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float." }, { "q": "How does NNC4848-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNCF4848-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 240×300×60 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4848-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 240×300×60 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNC4848-CV", "SKF NNC 4848 CV" ], "locale_variants": {} }, { "sku": "NNC4852-CV", "brand": "SKF", "manufacturer_designation": "SKF NNC 4852 CV", "series": "NNC4800-series", "type": "cylindrical_roller", "d_mm": 260, "D_mm": 320, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 561, "static_load_kN": 1400, "fatigue_load_limit_kN": 132, "max_rpm": 1000, "reference_speed_rpm": 800, "limiting_speed_rpm": 1000, "weight_g": 11000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 260 mm shaft, SKF lists NNC4852-CV as double-row full-complement cylindrical roller: 320 mm OD, 60 mm wide, Pu 132 kN, the catalogue lists 800 r/min thermal reference speed and 1,000 r/min mechanical limiting speed. Reading the NNC prefix: a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. This makes the execution two-direction locating — the retaining-ring configuration closes both axial escape paths. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. The radial section height is 30.0 mm and the catalogue mass 11000 g; at 561 kN dynamic rating this is roughly 2.16 kN of C per millimetre of bore before application factors. Fit practice for NNC4852-CV: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 60 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 320 mm raceway.", "The 561/1400 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNC4852-CV?", "a": "SKF NNC 4852 CV is a double-row full-complement cylindrical roller bearing with 260 mm bore, 320 mm OD and 60 mm width per ISO 15. SKF lists C 561 kN, C0 1400 kN, Pu 132 kN, reference speed 800 r/min and limiting speed 1,000 r/min, mass about 11000 g." }, { "q": "What does the NNC designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides." }, { "q": "Can NNC4852-CV take axial load and locate the shaft?", "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float." }, { "q": "How does NNC4852-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNCF4852-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 260×320×60 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4852-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 260×320×60 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNC4852-CV", "SKF NNC 4852 CV" ], "locale_variants": {} }, { "sku": "NNC4856-CV", "brand": "SKF", "manufacturer_designation": "SKF NNC 4856 CV", "series": "NNC4800-series", "type": "cylindrical_roller", "d_mm": 280, "D_mm": 350, "B_mm": 69, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 737, "static_load_kN": 1860, "fatigue_load_limit_kN": 173, "max_rpm": 950, "reference_speed_rpm": 750, "limiting_speed_rpm": 950, "weight_g": 16000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NNC4856-CV is the 280 mm bore entry in the NNC4800 range: a 280×350×69 mm double-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 737 kN / C0 1860 kN. Reading the NNC prefix: a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. This makes the execution two-direction locating — the retaining-ring configuration closes both axial escape paths. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. The radial section height is 35.0 mm and the catalogue mass 16000 g; at 737 kN dynamic rating this is roughly 2.63 kN of C per millimetre of bore before application factors. Fit practice for NNC4856-CV: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks", "mining shovel and dragline pivots" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 69 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 737/1860 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNC4856-CV?", "a": "SKF NNC 4856 CV is a double-row full-complement cylindrical roller bearing with 280 mm bore, 350 mm OD and 69 mm width per ISO 15. SKF lists C 737 kN, C0 1860 kN, Pu 173 kN, reference speed 750 r/min and limiting speed 950 r/min, mass about 16000 g." }, { "q": "What does the NNC designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides." }, { "q": "Can NNC4856-CV take axial load and locate the shaft?", "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float." }, { "q": "How does NNC4856-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNCF4856-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 280×350×69 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4856-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 280×350×69 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNC4856-CV", "SKF NNC 4856 CV" ], "locale_variants": {} }, { "sku": "NNC4860-CV", "brand": "SKF", "manufacturer_designation": "SKF NNC 4860 CV", "series": "NNC4800-series", "type": "cylindrical_roller", "d_mm": 300, "D_mm": 380, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 858, "static_load_kN": 2120, "fatigue_load_limit_kN": 196, "max_rpm": 850, "reference_speed_rpm": 700, "limiting_speed_rpm": 850, "weight_g": 23000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NNC 4860 CV resolves to a 300×380×80 mm double-row full-complement cylindrical roller bearing (dimension series 48 (compact heavy section)); a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. Structurally, the NNC design has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. In arrangement terms it is two-direction locating — the retaining-ring configuration closes both axial escape paths. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. With C 858 kN and C0 2120 kN, size the bearing on the 300×380 mm ISO 15 envelope and check the 196 kN Pu against the equivalent-load floor; the catalogue lists 700 r/min thermal reference speed and 850 r/min mechanical limiting speed. Assembly note: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "large offshore winch and hook blocks", "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 858/2120 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNC4860-CV?", "a": "SKF NNC 4860 CV is a double-row full-complement cylindrical roller bearing with 300 mm bore, 380 mm OD and 80 mm width per ISO 15. SKF lists C 858 kN, C0 2120 kN, Pu 196 kN, reference speed 700 r/min and limiting speed 850 r/min, mass about 23000 g." }, { "q": "What does the NNC designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides." }, { "q": "Can NNC4860-CV take axial load and locate the shaft?", "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float." }, { "q": "How does NNC4860-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNCF4860-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 300×380×80 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4860-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 300×380×80 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNC4860-CV", "SKF NNC 4860 CV" ], "locale_variants": {} }, { "sku": "NNC4864-CV", "brand": "SKF", "manufacturer_designation": "SKF NNC 4864 CV", "series": "NNC4800-series", "type": "cylindrical_roller", "d_mm": 320, "D_mm": 400, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 897, "static_load_kN": 2280, "fatigue_load_limit_kN": 208, "max_rpm": 800, "reference_speed_rpm": 630, "limiting_speed_rpm": 800, "weight_g": 24000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NNC 4864 CV denotes a double-row full-complement cylindrical roller bearing on the ISO 15 320×400×80 mm envelope, dimension series 48 (compact heavy section), with catalogue mass 24000 g. Structurally, the NNC design has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. In arrangement terms it is two-direction locating — the retaining-ring configuration closes both axial escape paths. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. With C 897 kN and C0 2280 kN, size the bearing on the 320×400 mm ISO 15 envelope and check the 208 kN Pu against the equivalent-load floor; the catalogue lists 630 r/min thermal reference speed and 800 r/min mechanical limiting speed. Assembly note: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 80 mm-wide ring and concentrates load.", "The 897/2280 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNC4864-CV?", "a": "SKF NNC 4864 CV is a double-row full-complement cylindrical roller bearing with 320 mm bore, 400 mm OD and 80 mm width per ISO 15. SKF lists C 897 kN, C0 2280 kN, Pu 208 kN, reference speed 630 r/min and limiting speed 800 r/min, mass about 24000 g." }, { "q": "What does the NNC designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides." }, { "q": "Can NNC4864-CV take axial load and locate the shaft?", "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float." }, { "q": "How does NNC4864-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNCF4864-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 320×400×80 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4864-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 320×400×80 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNC4864-CV", "SKF NNC 4864 CV" ], "locale_variants": {} }, { "sku": "NNC4868-CV", "brand": "SKF", "manufacturer_designation": "SKF NNC 4868 CV", "series": "NNC4800-series", "type": "cylindrical_roller", "d_mm": 340, "D_mm": 420, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 913, "static_load_kN": 2400, "fatigue_load_limit_kN": 216, "max_rpm": 750, "reference_speed_rpm": 600, "limiting_speed_rpm": 750, "weight_g": 25500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NNC 4868 CV is a double-row full-complement cylindrical roller bearing sized 340×420×80 mm — a dimension series 48 (compact heavy section), listed in SKF catalogue PUB BU/P1 17000 ch. 6.4. Structurally, the NNC design has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. In arrangement terms it is two-direction locating — the retaining-ring configuration closes both axial escape paths. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The radial section height is 40.0 mm and the catalogue mass 25500 g; at 913 kN dynamic rating this is roughly 2.69 kN of C per millimetre of bore before application factors. Fit practice for NNC4868-CV: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 80 mm-wide ring and concentrates load.", "The 913/2400 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNC4868-CV?", "a": "SKF NNC 4868 CV is a double-row full-complement cylindrical roller bearing with 340 mm bore, 420 mm OD and 80 mm width per ISO 15. SKF lists C 913 kN, C0 2400 kN, Pu 216 kN, reference speed 600 r/min and limiting speed 750 r/min, mass about 25500 g." }, { "q": "What does the NNC designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides." }, { "q": "Can NNC4868-CV take axial load and locate the shaft?", "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float." }, { "q": "How does NNC4868-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNCF4868-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 340×420×80 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4868-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 340×420×80 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNC4868-CV", "SKF NNC 4868 CV" ], "locale_variants": {} }, { "sku": "NNC4872-CV", "brand": "SKF", "manufacturer_designation": "SKF NNC 4872 CV", "series": "NNC4800-series", "type": "cylindrical_roller", "d_mm": 360, "D_mm": 440, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 935, "static_load_kN": 2550, "fatigue_load_limit_kN": 224, "max_rpm": 700, "reference_speed_rpm": 560, "limiting_speed_rpm": 700, "weight_g": 27000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NNC 4872 CV is a double-row full-complement cylindrical roller bearing sized 360×440×80 mm — a dimension series 48 (compact heavy section), listed in SKF catalogue PUB BU/P1 17000 ch. 6.4. Reading the NNC prefix: a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. This makes the execution two-direction locating — the retaining-ring configuration closes both axial escape paths. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 360 mm seat is about 2.60 kN/mm, typical of dimension series 48 (compact heavy section); use C0 2550 kN for static checks such as crane hook blocks standing under load. Fit practice for NNC4872-CV: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 80 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 440 mm raceway.", "The 935/2550 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNC4872-CV?", "a": "SKF NNC 4872 CV is a double-row full-complement cylindrical roller bearing with 360 mm bore, 440 mm OD and 80 mm width per ISO 15. SKF lists C 935 kN, C0 2550 kN, Pu 224 kN, reference speed 560 r/min and limiting speed 700 r/min, mass about 27000 g." }, { "q": "What does the NNC designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides." }, { "q": "Can NNC4872-CV take axial load and locate the shaft?", "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float." }, { "q": "How does NNC4872-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNCF4872-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 360×440×80 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4872-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 360×440×80 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNC4872-CV", "SKF NNC 4872 CV" ], "locale_variants": {} }, { "sku": "NNC4876-CV", "brand": "SKF", "manufacturer_designation": "SKF NNC 4876 CV", "series": "NNC4800-series", "type": "cylindrical_roller", "d_mm": 380, "D_mm": 480, "B_mm": 100, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1400, "static_load_kN": 3650, "fatigue_load_limit_kN": 315, "max_rpm": 670, "reference_speed_rpm": 530, "limiting_speed_rpm": 670, "weight_g": 45500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 380 mm shaft, SKF lists NNC4876-CV as double-row full-complement cylindrical roller: 480 mm OD, 100 mm wide, Pu 315 kN, the catalogue lists 530 r/min thermal reference speed and 670 r/min mechanical limiting speed. The NNC configuration means a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides; functionally the bearing is two-direction locating — the retaining-ring configuration closes both axial escape paths. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. With C 1400 kN and C0 3650 kN, size the bearing on the 380×480 mm ISO 15 envelope and check the 315 kN Pu against the equivalent-load floor; the catalogue lists 530 r/min thermal reference speed and 670 r/min mechanical limiting speed. Mounting: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. A 380 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "large offshore winch and hook blocks", "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 480 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 480 mm raceway.", "The 1400/3650 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNC4876-CV?", "a": "SKF NNC 4876 CV is a double-row full-complement cylindrical roller bearing with 380 mm bore, 480 mm OD and 100 mm width per ISO 15. SKF lists C 1400 kN, C0 3650 kN, Pu 315 kN, reference speed 530 r/min and limiting speed 670 r/min, mass about 45500 g." }, { "q": "What does the NNC designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides." }, { "q": "Can NNC4876-CV take axial load and locate the shaft?", "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float." }, { "q": "How does NNC4876-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNCF4876-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 380×480×100 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4876-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 380×480×100 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNC4876-CV", "SKF NNC 4876 CV" ], "locale_variants": {} }, { "sku": "NNC4880-CV", "brand": "SKF", "manufacturer_designation": "SKF NNC 4880 CV", "series": "NNC4800-series", "type": "cylindrical_roller", "d_mm": 400, "D_mm": 500, "B_mm": 100, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1420, "static_load_kN": 3750, "fatigue_load_limit_kN": 325, "max_rpm": 630, "reference_speed_rpm": 500, "limiting_speed_rpm": 630, "weight_g": 46500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 400 mm shaft, SKF lists NNC4880-CV as double-row full-complement cylindrical roller: 500 mm OD, 100 mm wide, Pu 325 kN, the catalogue lists 500 r/min thermal reference speed and 630 r/min mechanical limiting speed. Structurally, the NNC design has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. In arrangement terms it is two-direction locating — the retaining-ring configuration closes both axial escape paths. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 2.64 (3750 against 1420 kN), and the Pu figure 325 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 500 r/min thermal reference speed and 630 r/min mechanical limiting speed. Mounting: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. A 400 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "large offshore winch and hook blocks", "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 1420/3750 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNC4880-CV?", "a": "SKF NNC 4880 CV is a double-row full-complement cylindrical roller bearing with 400 mm bore, 500 mm OD and 100 mm width per ISO 15. SKF lists C 1420 kN, C0 3750 kN, Pu 325 kN, reference speed 500 r/min and limiting speed 630 r/min, mass about 46500 g." }, { "q": "What does the NNC designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides." }, { "q": "Can NNC4880-CV take axial load and locate the shaft?", "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float." }, { "q": "How does NNC4880-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNCF4880-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 400×500×100 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4880-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 400×500×100 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNC4880-CV", "SKF NNC 4880 CV" ], "locale_variants": {} }, { "sku": "NNC4912-CV", "brand": "SKF", "manufacturer_designation": "SKF NNC 4912 CV", "series": "NNC4900-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 85, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 78.1, "static_load_kN": 137, "fatigue_load_limit_kN": 14.3, "max_rpm": 4500, "reference_speed_rpm": 3600, "limiting_speed_rpm": 4500, "weight_g": 490, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NNC 4912 CV is a double-row full-complement cylindrical roller bearing sized 60×85×25 mm — a dimension series 49 (compact heavy section), listed in SKF catalogue PUB BU/P1 17000 ch. 6.4. The NNC configuration means a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides; functionally the bearing is two-direction locating — the retaining-ring configuration closes both axial escape paths. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Speed planning for NNC4912-CV: the catalogue lists 3,600 r/min thermal reference speed and 4,500 r/min mechanical limiting speed. The mass entry 490 g covers the complete catalogue execution. Fit practice for NNC4912-CV: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "offshore crane sheaves", "heavy material-handling rope pulleys", "rolling-mill and caster drives", "large crane and winch drums" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 85 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 25 mm-wide ring and concentrates load.", "The 78.1/137 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNC4912-CV?", "a": "SKF NNC 4912 CV is a double-row full-complement cylindrical roller bearing with 60 mm bore, 85 mm OD and 25 mm width per ISO 15. SKF lists C 78.1 kN, C0 137 kN, Pu 14.3 kN, reference speed 3,600 r/min and limiting speed 4,500 r/min, mass about 490 g." }, { "q": "What does the NNC designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides." }, { "q": "Can NNC4912-CV take axial load and locate the shaft?", "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float." }, { "q": "How does NNC4912-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNCF4912-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 60×85×25 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4912-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 60×85×25 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNC4912-CV", "SKF NNC 4912 CV" ], "locale_variants": {} }, { "sku": "NNC4914-CV", "brand": "SKF", "manufacturer_designation": "SKF NNC 4914 CV", "series": "NNC4900-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 100, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 114, "static_load_kN": 193, "fatigue_load_limit_kN": 22.4, "max_rpm": 3800, "reference_speed_rpm": 3000, "limiting_speed_rpm": 3800, "weight_g": 780, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NNC 4914 CV resolves to a 70×100×30 mm double-row full-complement cylindrical roller bearing (dimension series 49 (compact heavy section)); a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. The NNC configuration means a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides; functionally the bearing is two-direction locating — the retaining-ring configuration closes both axial escape paths. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. With C 114 kN and C0 193 kN, size the bearing on the 70×100 mm ISO 15 envelope and check the 22.4 kN Pu against the equivalent-load floor; the catalogue lists 3,000 r/min thermal reference speed and 3,800 r/min mechanical limiting speed. Mounting: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. A 70 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "rolling-mill and caster drives", "large crane and winch drums", "offshore crane sheaves", "heavy material-handling rope pulleys" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 100 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 100 mm raceway.", "The 114/193 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNC4914-CV?", "a": "SKF NNC 4914 CV is a double-row full-complement cylindrical roller bearing with 70 mm bore, 100 mm OD and 30 mm width per ISO 15. SKF lists C 114 kN, C0 193 kN, Pu 22.4 kN, reference speed 3,000 r/min and limiting speed 3,800 r/min, mass about 780 g." }, { "q": "What does the NNC designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides." }, { "q": "Can NNC4914-CV take axial load and locate the shaft?", "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float." }, { "q": "How does NNC4914-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNCF4914-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 70×100×30 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4914-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 70×100×30 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNC4914-CV", "SKF NNC 4914 CV" ], "locale_variants": {} }, { "sku": "NNC4916-CV", "brand": "SKF", "manufacturer_designation": "SKF NNC 4916 CV", "series": "NNC4900-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 110, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 121, "static_load_kN": 216, "fatigue_load_limit_kN": 25, "max_rpm": 3400, "reference_speed_rpm": 2600, "limiting_speed_rpm": 3400, "weight_g": 880, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 80 mm shaft, SKF lists NNC4916-CV as double-row full-complement cylindrical roller: 110 mm OD, 30 mm wide, Pu 25 kN, the catalogue lists 2,600 r/min thermal reference speed and 3,400 r/min mechanical limiting speed. The NNC configuration means a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides; functionally the bearing is two-direction locating — the retaining-ring configuration closes both axial escape paths. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. With C 121 kN and C0 216 kN, size the bearing on the 80×110 mm ISO 15 envelope and check the 25 kN Pu against the equivalent-load floor; the catalogue lists 2,600 r/min thermal reference speed and 3,400 r/min mechanical limiting speed. Mounting: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. A 80 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "heavy material-handling rope pulleys", "rolling-mill and caster drives", "large crane and winch drums", "offshore crane sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 110 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 30 mm-wide ring and concentrates load.", "The 121/216 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNC4916-CV?", "a": "SKF NNC 4916 CV is a double-row full-complement cylindrical roller bearing with 80 mm bore, 110 mm OD and 30 mm width per ISO 15. SKF lists C 121 kN, C0 216 kN, Pu 25 kN, reference speed 2,600 r/min and limiting speed 3,400 r/min, mass about 880 g." }, { "q": "What does the NNC designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides." }, { "q": "Can NNC4916-CV take axial load and locate the shaft?", "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float." }, { "q": "How does NNC4916-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNCF4916-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 80×110×30 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4916-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 80×110×30 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNC4916-CV", "SKF NNC 4916 CV" ], "locale_variants": {} }, { "sku": "NNC4918-CV", "brand": "SKF", "manufacturer_designation": "SKF NNC 4918 CV", "series": "NNC4900-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 125, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 161, "static_load_kN": 300, "fatigue_load_limit_kN": 35.5, "max_rpm": 3000, "reference_speed_rpm": 2400, "limiting_speed_rpm": 3000, "weight_g": 1350, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NNC 4918 CV denotes a double-row full-complement cylindrical roller bearing on the ISO 15 90×125×35 mm envelope, dimension series 49 (compact heavy section), with catalogue mass 1350 g. The NNC configuration means a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides; functionally the bearing is two-direction locating — the retaining-ring configuration closes both axial escape paths. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. With C 161 kN and C0 300 kN, size the bearing on the 90×125 mm ISO 15 envelope and check the 35.5 kN Pu against the equivalent-load floor; the catalogue lists 2,400 r/min thermal reference speed and 3,000 r/min mechanical limiting speed. Mounting: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. A 90 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "offshore crane sheaves", "heavy material-handling rope pulleys", "rolling-mill and caster drives", "large crane and winch drums" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 125 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 161/300 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNC4918-CV?", "a": "SKF NNC 4918 CV is a double-row full-complement cylindrical roller bearing with 90 mm bore, 125 mm OD and 35 mm width per ISO 15. SKF lists C 161 kN, C0 300 kN, Pu 35.5 kN, reference speed 2,400 r/min and limiting speed 3,000 r/min, mass about 1350 g." }, { "q": "What does the NNC designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides." }, { "q": "Can NNC4918-CV take axial load and locate the shaft?", "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float." }, { "q": "How does NNC4918-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNCF4918-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 90×125×35 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4918-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 90×125×35 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNC4918-CV", "SKF NNC 4918 CV" ], "locale_variants": {} }, { "sku": "NNC4920-CV", "brand": "SKF", "manufacturer_designation": "SKF NNC 4920 CV", "series": "NNC4900-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 140, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 209, "static_load_kN": 400, "fatigue_load_limit_kN": 46.5, "max_rpm": 2600, "reference_speed_rpm": 2000, "limiting_speed_rpm": 2600, "weight_g": 1950, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 100 mm shaft, SKF lists NNC4920-CV as double-row full-complement cylindrical roller: 140 mm OD, 40 mm wide, Pu 46.5 kN, the catalogue lists 2,000 r/min thermal reference speed and 2,600 r/min mechanical limiting speed. Reading the NNC prefix: a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. This makes the execution two-direction locating — the retaining-ring configuration closes both axial escape paths. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 100 mm seat is about 2.09 kN/mm, typical of dimension series 49 (compact heavy section); use C0 400 kN for static checks such as crane hook blocks standing under load. Mounting: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. A 100 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "offshore crane sheaves", "heavy material-handling rope pulleys", "rolling-mill and caster drives", "large crane and winch drums" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 40 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 140 mm raceway.", "The 209/400 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNC4920-CV?", "a": "SKF NNC 4920 CV is a double-row full-complement cylindrical roller bearing with 100 mm bore, 140 mm OD and 40 mm width per ISO 15. SKF lists C 209 kN, C0 400 kN, Pu 46.5 kN, reference speed 2,000 r/min and limiting speed 2,600 r/min, mass about 1950 g." }, { "q": "What does the NNC designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides." }, { "q": "Can NNC4920-CV take axial load and locate the shaft?", "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float." }, { "q": "How does NNC4920-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNCF4920-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 100×140×40 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4920-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 100×140×40 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNC4920-CV", "SKF NNC 4920 CV" ], "locale_variants": {} }, { "sku": "NNC4922-CV", "brand": "SKF", "manufacturer_designation": "SKF NNC 4922 CV", "series": "NNC4900-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 150, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 220, "static_load_kN": 430, "fatigue_load_limit_kN": 49, "max_rpm": 2400, "reference_speed_rpm": 1900, "limiting_speed_rpm": 2400, "weight_g": 2150, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NNC 4922 CV denotes a double-row full-complement cylindrical roller bearing on the ISO 15 110×150×40 mm envelope, dimension series 49 (compact heavy section), with catalogue mass 2150 g. Reading the NNC prefix: a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. This makes the execution two-direction locating — the retaining-ring configuration closes both axial escape paths. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Speed planning for NNC4922-CV: the catalogue lists 1,900 r/min thermal reference speed and 2,400 r/min mechanical limiting speed. The mass entry 2150 g covers the complete catalogue execution. Assembly note: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "rolling-mill and caster drives", "large crane and winch drums", "offshore crane sheaves", "heavy material-handling rope pulleys" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 40 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 220/430 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNC4922-CV?", "a": "SKF NNC 4922 CV is a double-row full-complement cylindrical roller bearing with 110 mm bore, 150 mm OD and 40 mm width per ISO 15. SKF lists C 220 kN, C0 430 kN, Pu 49 kN, reference speed 1,900 r/min and limiting speed 2,400 r/min, mass about 2150 g." }, { "q": "What does the NNC designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides." }, { "q": "Can NNC4922-CV take axial load and locate the shaft?", "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float." }, { "q": "How does NNC4922-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNCF4922-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 110×150×40 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4922-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 110×150×40 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNC4922-CV", "SKF NNC 4922 CV" ], "locale_variants": {} }, { "sku": "NNC4924-CV", "brand": "SKF", "manufacturer_designation": "SKF NNC 4924 CV", "series": "NNC4900-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 165, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 242, "static_load_kN": 480, "fatigue_load_limit_kN": 53, "max_rpm": 2200, "reference_speed_rpm": 1700, "limiting_speed_rpm": 2200, "weight_g": 2950, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NNC4924-CV is the 120 mm bore entry in the NNC4900 range: a 120×165×45 mm double-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 242 kN / C0 480 kN. Reading the NNC prefix: a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. This makes the execution two-direction locating — the retaining-ring configuration closes both axial escape paths. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Speed planning for NNC4924-CV: the catalogue lists 1,700 r/min thermal reference speed and 2,200 r/min mechanical limiting speed. The mass entry 2950 g covers the complete catalogue execution. Assembly note: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 45 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 165 mm raceway.", "The 242/480 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNC4924-CV?", "a": "SKF NNC 4924 CV is a double-row full-complement cylindrical roller bearing with 120 mm bore, 165 mm OD and 45 mm width per ISO 15. SKF lists C 242 kN, C0 480 kN, Pu 53 kN, reference speed 1,700 r/min and limiting speed 2,200 r/min, mass about 2950 g." }, { "q": "What does the NNC designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides." }, { "q": "Can NNC4924-CV take axial load and locate the shaft?", "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float." }, { "q": "How does NNC4924-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNCF4924-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 120×165×45 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4924-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 120×165×45 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNC4924-CV", "SKF NNC 4924 CV" ], "locale_variants": {} }, { "sku": "NNC4926-CV", "brand": "SKF", "manufacturer_designation": "SKF NNC 4926 CV", "series": "NNC4900-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 180, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 297, "static_load_kN": 530, "fatigue_load_limit_kN": 60, "max_rpm": 2000, "reference_speed_rpm": 1600, "limiting_speed_rpm": 2000, "weight_g": 3950, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NNC 4926 CV is a double-row full-complement cylindrical roller bearing sized 130×180×50 mm — a dimension series 49 (compact heavy section), listed in SKF catalogue PUB BU/P1 17000 ch. 6.4. Reading the NNC prefix: a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. This makes the execution two-direction locating — the retaining-ring configuration closes both axial escape paths. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Speed planning for NNC4926-CV: the catalogue lists 1,600 r/min thermal reference speed and 2,000 r/min mechanical limiting speed. The mass entry 3950 g covers the complete catalogue execution. Assembly note: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "large offshore winch and hook blocks", "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 50 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 50 mm-wide ring and concentrates load.", "The 297/530 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNC4926-CV?", "a": "SKF NNC 4926 CV is a double-row full-complement cylindrical roller bearing with 130 mm bore, 180 mm OD and 50 mm width per ISO 15. SKF lists C 297 kN, C0 530 kN, Pu 60 kN, reference speed 1,600 r/min and limiting speed 2,000 r/min, mass about 3950 g." }, { "q": "What does the NNC designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides." }, { "q": "Can NNC4926-CV take axial load and locate the shaft?", "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float." }, { "q": "How does NNC4926-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNCF4926-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 130×180×50 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4926-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 130×180×50 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNC4926-CV", "SKF NNC 4926 CV" ], "locale_variants": {} }, { "sku": "NNC4928-CV", "brand": "SKF", "manufacturer_designation": "SKF NNC 4928 CV", "series": "NNC4900-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 190, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 308, "static_load_kN": 570, "fatigue_load_limit_kN": 63, "max_rpm": 1900, "reference_speed_rpm": 1500, "limiting_speed_rpm": 1900, "weight_g": 4200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NNC 4928 CV denotes a double-row full-complement cylindrical roller bearing on the ISO 15 140×190×50 mm envelope, dimension series 49 (compact heavy section), with catalogue mass 4200 g. Reading the NNC prefix: a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. This makes the execution two-direction locating — the retaining-ring configuration closes both axial escape paths. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Speed planning for NNC4928-CV: the catalogue lists 1,500 r/min thermal reference speed and 1,900 r/min mechanical limiting speed. The mass entry 4200 g covers the complete catalogue execution. Fit practice for NNC4928-CV: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks", "mining shovel and dragline pivots" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 50 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 308/570 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNC4928-CV?", "a": "SKF NNC 4928 CV is a double-row full-complement cylindrical roller bearing with 140 mm bore, 190 mm OD and 50 mm width per ISO 15. SKF lists C 308 kN, C0 570 kN, Pu 63 kN, reference speed 1,500 r/min and limiting speed 1,900 r/min, mass about 4200 g." }, { "q": "What does the NNC designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides." }, { "q": "Can NNC4928-CV take axial load and locate the shaft?", "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float." }, { "q": "How does NNC4928-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNCF4928-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 140×190×50 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4928-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 140×190×50 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNC4928-CV", "SKF NNC 4928 CV" ], "locale_variants": {} }, { "sku": "NNC4930-CV", "brand": "SKF", "manufacturer_designation": "SKF NNC 4930 CV", "series": "NNC4900-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 210, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 429, "static_load_kN": 830, "fatigue_load_limit_kN": 91.5, "max_rpm": 1700, "reference_speed_rpm": 1400, "limiting_speed_rpm": 1700, "weight_g": 6650, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 150 mm shaft, SKF lists NNC4930-CV as double-row full-complement cylindrical roller: 210 mm OD, 60 mm wide, Pu 91.5 kN, the catalogue lists 1,400 r/min thermal reference speed and 1,700 r/min mechanical limiting speed. The NNC configuration means a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides; functionally the bearing is two-direction locating — the retaining-ring configuration closes both axial escape paths. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. The radial section height is 30.0 mm and the catalogue mass 6650 g; at 429 kN dynamic rating this is roughly 2.86 kN of C per millimetre of bore before application factors. Fit practice for NNC4930-CV: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "large offshore winch and hook blocks", "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 210 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 210 mm raceway.", "The 429/830 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNC4930-CV?", "a": "SKF NNC 4930 CV is a double-row full-complement cylindrical roller bearing with 150 mm bore, 210 mm OD and 60 mm width per ISO 15. SKF lists C 429 kN, C0 830 kN, Pu 91.5 kN, reference speed 1,400 r/min and limiting speed 1,700 r/min, mass about 6650 g." }, { "q": "What does the NNC designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides." }, { "q": "Can NNC4930-CV take axial load and locate the shaft?", "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float." }, { "q": "How does NNC4930-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNCF4930-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 150×210×60 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4930-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 150×210×60 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNC4930-CV", "SKF NNC 4930 CV" ], "locale_variants": {} }, { "sku": "NNC4932-CV", "brand": "SKF", "manufacturer_designation": "SKF NNC 4932 CV", "series": "NNC4900-series", "type": "cylindrical_roller", "d_mm": 160, "D_mm": 220, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 446, "static_load_kN": 915, "fatigue_load_limit_kN": 96.5, "max_rpm": 1600, "reference_speed_rpm": 1300, "limiting_speed_rpm": 1600, "weight_g": 7000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NNC 4932 CV denotes a double-row full-complement cylindrical roller bearing on the ISO 15 160×220×60 mm envelope, dimension series 49 (compact heavy section), with catalogue mass 7000 g. Structurally, the NNC design has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. In arrangement terms it is two-direction locating — the retaining-ring configuration closes both axial escape paths. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 160 mm seat is about 2.79 kN/mm, typical of dimension series 49 (compact heavy section); use C0 915 kN for static checks such as crane hook blocks standing under load. Mounting: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. A 160 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "large offshore winch and hook blocks", "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 446/915 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNC4932-CV?", "a": "SKF NNC 4932 CV is a double-row full-complement cylindrical roller bearing with 160 mm bore, 220 mm OD and 60 mm width per ISO 15. SKF lists C 446 kN, C0 915 kN, Pu 96.5 kN, reference speed 1,300 r/min and limiting speed 1,600 r/min, mass about 7000 g." }, { "q": "What does the NNC designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides." }, { "q": "Can NNC4932-CV take axial load and locate the shaft?", "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float." }, { "q": "How does NNC4932-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNCF4932-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 160×220×60 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4932-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 160×220×60 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNC4932-CV", "SKF NNC 4932 CV" ], "locale_variants": {} }, { "sku": "NNC4934-CV", "brand": "SKF", "manufacturer_designation": "SKF NNC 4934 CV", "series": "NNC4900-series", "type": "cylindrical_roller", "d_mm": 170, "D_mm": 230, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 457, "static_load_kN": 950, "fatigue_load_limit_kN": 100, "max_rpm": 1500, "reference_speed_rpm": 1200, "limiting_speed_rpm": 1500, "weight_g": 7350, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NNC4934-CV is the 170 mm bore entry in the NNC4900 range: a 170×230×60 mm double-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 457 kN / C0 950 kN. Structurally, the NNC design has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. In arrangement terms it is two-direction locating — the retaining-ring configuration closes both axial escape paths. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 170 mm seat is about 2.69 kN/mm, typical of dimension series 49 (compact heavy section); use C0 950 kN for static checks such as crane hook blocks standing under load. Mounting: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. A 170 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks", "mining shovel and dragline pivots" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 230 mm raceway.", "The 457/950 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNC4934-CV?", "a": "SKF NNC 4934 CV is a double-row full-complement cylindrical roller bearing with 170 mm bore, 230 mm OD and 60 mm width per ISO 15. SKF lists C 457 kN, C0 950 kN, Pu 100 kN, reference speed 1,200 r/min and limiting speed 1,500 r/min, mass about 7350 g." }, { "q": "What does the NNC designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides." }, { "q": "Can NNC4934-CV take axial load and locate the shaft?", "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float." }, { "q": "How does NNC4934-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNCF4934-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 170×230×60 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4934-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 170×230×60 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNC4934-CV", "SKF NNC 4934 CV" ], "locale_variants": {} }, { "sku": "NNC4936-CV", "brand": "SKF", "manufacturer_designation": "SKF NNC 4936 CV", "series": "NNC4900-series", "type": "cylindrical_roller", "d_mm": 180, "D_mm": 250, "B_mm": 69, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 594, "static_load_kN": 1220, "fatigue_load_limit_kN": 127, "max_rpm": 1400, "reference_speed_rpm": 1100, "limiting_speed_rpm": 1400, "weight_g": 11000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NNC 4936 CV is a double-row full-complement cylindrical roller bearing sized 180×250×69 mm — a dimension series 49 (compact heavy section), listed in SKF catalogue PUB BU/P1 17000 ch. 6.4. Structurally, the NNC design has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. In arrangement terms it is two-direction locating — the retaining-ring configuration closes both axial escape paths. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Load-per-bore for the 180 mm seat is about 3.30 kN/mm, typical of dimension series 49 (compact heavy section); use C0 1220 kN for static checks such as crane hook blocks standing under load. Mounting: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. A 180 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 69 mm-wide ring and concentrates load.", "The 594/1220 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNC4936-CV?", "a": "SKF NNC 4936 CV is a double-row full-complement cylindrical roller bearing with 180 mm bore, 250 mm OD and 69 mm width per ISO 15. SKF lists C 594 kN, C0 1220 kN, Pu 127 kN, reference speed 1,100 r/min and limiting speed 1,400 r/min, mass about 11000 g." }, { "q": "What does the NNC designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides." }, { "q": "Can NNC4936-CV take axial load and locate the shaft?", "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float." }, { "q": "How does NNC4936-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNCF4936-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 180×250×69 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4936-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 180×250×69 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNC4936-CV", "SKF NNC 4936 CV" ], "locale_variants": {} }, { "sku": "NNC4938-CV", "brand": "SKF", "manufacturer_designation": "SKF NNC 4938 CV", "series": "NNC4900-series", "type": "cylindrical_roller", "d_mm": 190, "D_mm": 260, "B_mm": 69, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 605, "static_load_kN": 1290, "fatigue_load_limit_kN": 132, "max_rpm": 1400, "reference_speed_rpm": 1100, "limiting_speed_rpm": 1400, "weight_g": 11000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NNC 4938 CV resolves to a 190×260×69 mm double-row full-complement cylindrical roller bearing (dimension series 49 (compact heavy section)); a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. Structurally, the NNC design has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. In arrangement terms it is two-direction locating — the retaining-ring configuration closes both axial escape paths. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 190 mm seat is about 3.18 kN/mm, typical of dimension series 49 (compact heavy section); use C0 1290 kN for static checks such as crane hook blocks standing under load. Mounting: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. A 190 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "large offshore winch and hook blocks", "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 605/1290 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNC4938-CV?", "a": "SKF NNC 4938 CV is a double-row full-complement cylindrical roller bearing with 190 mm bore, 260 mm OD and 69 mm width per ISO 15. SKF lists C 605 kN, C0 1290 kN, Pu 132 kN, reference speed 1,100 r/min and limiting speed 1,400 r/min, mass about 11000 g." }, { "q": "What does the NNC designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides." }, { "q": "Can NNC4938-CV take axial load and locate the shaft?", "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float." }, { "q": "How does NNC4938-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNCF4938-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 190×260×69 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4938-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 190×260×69 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNC4938-CV", "SKF NNC 4938 CV" ], "locale_variants": {} }, { "sku": "NNC4940-CV", "brand": "SKF", "manufacturer_designation": "SKF NNC 4940 CV", "series": "NNC4900-series", "type": "cylindrical_roller", "d_mm": 200, "D_mm": 280, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 704, "static_load_kN": 1500, "fatigue_load_limit_kN": 153, "max_rpm": 1300, "reference_speed_rpm": 1000, "limiting_speed_rpm": 1300, "weight_g": 16000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NNC 4940 CV is a double-row full-complement cylindrical roller bearing sized 200×280×80 mm — a dimension series 49 (compact heavy section), listed in SKF catalogue PUB BU/P1 17000 ch. 6.4. Reading the NNC prefix: a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. This makes the execution two-direction locating — the retaining-ring configuration closes both axial escape paths. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. With C 704 kN and C0 1500 kN, size the bearing on the 200×280 mm ISO 15 envelope and check the 153 kN Pu against the equivalent-load floor; the catalogue lists 1,000 r/min thermal reference speed and 1,300 r/min mechanical limiting speed. Mounting: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. A 200 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 80 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 280 mm raceway.", "The 704/1500 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNC4940-CV?", "a": "SKF NNC 4940 CV is a double-row full-complement cylindrical roller bearing with 200 mm bore, 280 mm OD and 80 mm width per ISO 15. SKF lists C 704 kN, C0 1500 kN, Pu 153 kN, reference speed 1,000 r/min and limiting speed 1,300 r/min, mass about 16000 g." }, { "q": "What does the NNC designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides." }, { "q": "Can NNC4940-CV take axial load and locate the shaft?", "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float." }, { "q": "How does NNC4940-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNCF4940-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 200×280×80 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4940-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 200×280×80 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNC4940-CV", "SKF NNC 4940 CV" ], "locale_variants": {} }, { "sku": "NNC4944-CV", "brand": "SKF", "manufacturer_designation": "SKF NNC 4944 CV", "series": "NNC4900-series", "type": "cylindrical_roller", "d_mm": 220, "D_mm": 300, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 737, "static_load_kN": 1600, "fatigue_load_limit_kN": 160, "max_rpm": 1200, "reference_speed_rpm": 950, "limiting_speed_rpm": 1200, "weight_g": 17000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 220 mm shaft, SKF lists NNC4944-CV as double-row full-complement cylindrical roller: 300 mm OD, 80 mm wide, Pu 160 kN, the catalogue lists 950 r/min thermal reference speed and 1,200 r/min mechanical limiting speed. The NNC configuration means a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides; functionally the bearing is two-direction locating — the retaining-ring configuration closes both axial escape paths. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 2.17 (1600 against 737 kN), and the Pu figure 160 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 950 r/min thermal reference speed and 1,200 r/min mechanical limiting speed. Assembly note: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "large offshore winch and hook blocks", "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 300 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 300 mm raceway.", "The 737/1600 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNC4944-CV?", "a": "SKF NNC 4944 CV is a double-row full-complement cylindrical roller bearing with 220 mm bore, 300 mm OD and 80 mm width per ISO 15. SKF lists C 737 kN, C0 1600 kN, Pu 160 kN, reference speed 950 r/min and limiting speed 1,200 r/min, mass about 17000 g." }, { "q": "What does the NNC designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides." }, { "q": "Can NNC4944-CV take axial load and locate the shaft?", "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float." }, { "q": "How does NNC4944-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNCF4944-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 220×300×80 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4944-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 220×300×80 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNC4944-CV", "SKF NNC 4944 CV" ], "locale_variants": {} }, { "sku": "NNC4948-CV", "brand": "SKF", "manufacturer_designation": "SKF NNC 4948 CV", "series": "NNC4900-series", "type": "cylindrical_roller", "d_mm": 240, "D_mm": 320, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 781, "static_load_kN": 1760, "fatigue_load_limit_kN": 173, "max_rpm": 1100, "reference_speed_rpm": 850, "limiting_speed_rpm": 1100, "weight_g": 18500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NNC4948-CV is the 240 mm bore entry in the NNC4900 range: a 240×320×80 mm double-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 781 kN / C0 1760 kN. The NNC configuration means a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides; functionally the bearing is two-direction locating — the retaining-ring configuration closes both axial escape paths. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 2.25 (1760 against 781 kN), and the Pu figure 173 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 850 r/min thermal reference speed and 1,100 r/min mechanical limiting speed. Assembly note: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 320 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 781/1760 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNC4948-CV?", "a": "SKF NNC 4948 CV is a double-row full-complement cylindrical roller bearing with 240 mm bore, 320 mm OD and 80 mm width per ISO 15. SKF lists C 781 kN, C0 1760 kN, Pu 173 kN, reference speed 850 r/min and limiting speed 1,100 r/min, mass about 18500 g." }, { "q": "What does the NNC designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides." }, { "q": "Can NNC4948-CV take axial load and locate the shaft?", "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float." }, { "q": "How does NNC4948-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNCF4948-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 240×320×80 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4948-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 240×320×80 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNC4948-CV", "SKF NNC 4948 CV" ], "locale_variants": {} }, { "sku": "NNC4952-CV", "brand": "SKF", "manufacturer_designation": "SKF NNC 4952 CV", "series": "NNC4900-series", "type": "cylindrical_roller", "d_mm": 260, "D_mm": 360, "B_mm": 100, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1170, "static_load_kN": 2550, "fatigue_load_limit_kN": 245, "max_rpm": 950, "reference_speed_rpm": 750, "limiting_speed_rpm": 950, "weight_g": 32000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NNC 4952 CV resolves to a 260×360×100 mm double-row full-complement cylindrical roller bearing (dimension series 49 (compact heavy section)); a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. Structurally, the NNC design has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. In arrangement terms it is two-direction locating — the retaining-ring configuration closes both axial escape paths. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. With C 1170 kN and C0 2550 kN, size the bearing on the 260×360 mm ISO 15 envelope and check the 245 kN Pu against the equivalent-load floor; the catalogue lists 750 r/min thermal reference speed and 950 r/min mechanical limiting speed. Mounting: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. A 260 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "large offshore winch and hook blocks", "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 1170/2550 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNC4952-CV?", "a": "SKF NNC 4952 CV is a double-row full-complement cylindrical roller bearing with 260 mm bore, 360 mm OD and 100 mm width per ISO 15. SKF lists C 1170 kN, C0 2550 kN, Pu 245 kN, reference speed 750 r/min and limiting speed 950 r/min, mass about 32000 g." }, { "q": "What does the NNC designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides." }, { "q": "Can NNC4952-CV take axial load and locate the shaft?", "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float." }, { "q": "How does NNC4952-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNCF4952-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 260×360×100 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4952-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 260×360×100 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNC4952-CV", "SKF NNC 4952 CV" ], "locale_variants": {} }, { "sku": "NNC4956-CV", "brand": "SKF", "manufacturer_designation": "SKF NNC 4956 CV", "series": "NNC4900-series", "type": "cylindrical_roller", "d_mm": 280, "D_mm": 380, "B_mm": 100, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1210, "static_load_kN": 2700, "fatigue_load_limit_kN": 255, "max_rpm": 900, "reference_speed_rpm": 700, "limiting_speed_rpm": 900, "weight_g": 34000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NNC 4956 CV denotes a double-row full-complement cylindrical roller bearing on the ISO 15 280×380×100 mm envelope, dimension series 49 (compact heavy section), with catalogue mass 34000 g. Structurally, the NNC design has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. In arrangement terms it is two-direction locating — the retaining-ring configuration closes both axial escape paths. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. With C 1210 kN and C0 2700 kN, size the bearing on the 280×380 mm ISO 15 envelope and check the 255 kN Pu against the equivalent-load floor; the catalogue lists 700 r/min thermal reference speed and 900 r/min mechanical limiting speed. Mounting: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. A 280 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 100 mm-wide ring and concentrates load.", "The 1210/2700 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNC4956-CV?", "a": "SKF NNC 4956 CV is a double-row full-complement cylindrical roller bearing with 280 mm bore, 380 mm OD and 100 mm width per ISO 15. SKF lists C 1210 kN, C0 2700 kN, Pu 255 kN, reference speed 700 r/min and limiting speed 900 r/min, mass about 34000 g." }, { "q": "What does the NNC designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides." }, { "q": "Can NNC4956-CV take axial load and locate the shaft?", "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float." }, { "q": "How does NNC4956-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNCF4956-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 280×380×100 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4956-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 280×380×100 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNC4956-CV", "SKF NNC 4956 CV" ], "locale_variants": {} }, { "sku": "NNC4960-CV", "brand": "SKF", "manufacturer_designation": "SKF NNC 4960 CV", "series": "NNC4900-series", "type": "cylindrical_roller", "d_mm": 300, "D_mm": 420, "B_mm": 118, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1680, "static_load_kN": 3750, "fatigue_load_limit_kN": 355, "max_rpm": 800, "reference_speed_rpm": 670, "limiting_speed_rpm": 800, "weight_g": 53000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NNC 4960 CV denotes a double-row full-complement cylindrical roller bearing on the ISO 15 300×420×118 mm envelope, dimension series 49 (compact heavy section), with catalogue mass 53000 g. The NNC configuration means a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides; functionally the bearing is two-direction locating — the retaining-ring configuration closes both axial escape paths. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 300 mm seat is about 5.60 kN/mm, typical of dimension series 49 (compact heavy section); use C0 3750 kN for static checks such as crane hook blocks standing under load. Mounting: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. A 300 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "large offshore winch and hook blocks", "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 420 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 420 mm raceway.", "The 1680/3750 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNC4960-CV?", "a": "SKF NNC 4960 CV is a double-row full-complement cylindrical roller bearing with 300 mm bore, 420 mm OD and 118 mm width per ISO 15. SKF lists C 1680 kN, C0 3750 kN, Pu 355 kN, reference speed 670 r/min and limiting speed 800 r/min, mass about 53000 g." }, { "q": "What does the NNC designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides." }, { "q": "Can NNC4960-CV take axial load and locate the shaft?", "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float." }, { "q": "How does NNC4960-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNCF4960-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 300×420×118 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4960-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 300×420×118 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNC4960-CV", "SKF NNC 4960 CV" ], "locale_variants": {} }, { "sku": "NNC4964-CV", "brand": "SKF", "manufacturer_designation": "SKF NNC 4964 CV", "series": "NNC4900-series", "type": "cylindrical_roller", "d_mm": 320, "D_mm": 440, "B_mm": 118, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1760, "static_load_kN": 4050, "fatigue_load_limit_kN": 375, "max_rpm": 750, "reference_speed_rpm": 600, "limiting_speed_rpm": 750, "weight_g": 56000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NNC 4964 CV is a double-row full-complement cylindrical roller bearing sized 320×440×118 mm — a dimension series 49 (compact heavy section), listed in SKF catalogue PUB BU/P1 17000 ch. 6.4. The NNC configuration means a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides; functionally the bearing is two-direction locating — the retaining-ring configuration closes both axial escape paths. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Speed planning for NNC4964-CV: the catalogue lists 600 r/min thermal reference speed and 750 r/min mechanical limiting speed. The mass entry 56000 g covers the complete catalogue execution. Assembly note: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "large offshore winch and hook blocks", "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 440 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 440 mm raceway.", "The 1760/4050 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNC4964-CV?", "a": "SKF NNC 4964 CV is a double-row full-complement cylindrical roller bearing with 320 mm bore, 440 mm OD and 118 mm width per ISO 15. SKF lists C 1760 kN, C0 4050 kN, Pu 375 kN, reference speed 600 r/min and limiting speed 750 r/min, mass about 56000 g." }, { "q": "What does the NNC designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides." }, { "q": "Can NNC4964-CV take axial load and locate the shaft?", "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float." }, { "q": "How does NNC4964-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNCF4964-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 320×440×118 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4964-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 320×440×118 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNC4964-CV", "SKF NNC 4964 CV" ], "locale_variants": {} }, { "sku": "NNC4968-CV", "brand": "SKF", "manufacturer_designation": "SKF NNC 4968 CV", "series": "NNC4900-series", "type": "cylindrical_roller", "d_mm": 340, "D_mm": 460, "B_mm": 118, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1790, "static_load_kN": 4250, "fatigue_load_limit_kN": 390, "max_rpm": 700, "reference_speed_rpm": 560, "limiting_speed_rpm": 700, "weight_g": 59000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 340 mm shaft, SKF lists NNC4968-CV as double-row full-complement cylindrical roller: 460 mm OD, 118 mm wide, Pu 390 kN, the catalogue lists 560 r/min thermal reference speed and 700 r/min mechanical limiting speed. The NNC configuration means a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides; functionally the bearing is two-direction locating — the retaining-ring configuration closes both axial escape paths. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Speed planning for NNC4968-CV: the catalogue lists 560 r/min thermal reference speed and 700 r/min mechanical limiting speed. The mass entry 59000 g covers the complete catalogue execution. Assembly note: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 460 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 1790/4250 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNC4968-CV?", "a": "SKF NNC 4968 CV is a double-row full-complement cylindrical roller bearing with 340 mm bore, 460 mm OD and 118 mm width per ISO 15. SKF lists C 1790 kN, C0 4250 kN, Pu 390 kN, reference speed 560 r/min and limiting speed 700 r/min, mass about 59000 g." }, { "q": "What does the NNC designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides." }, { "q": "Can NNC4968-CV take axial load and locate the shaft?", "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float." }, { "q": "How does NNC4968-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNCF4968-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 340×460×118 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4968-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 340×460×118 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNC4968-CV", "SKF NNC 4968 CV" ], "locale_variants": {} }, { "sku": "NNC4972-CV", "brand": "SKF", "manufacturer_designation": "SKF NNC 4972 CV", "series": "NNC4900-series", "type": "cylindrical_roller", "d_mm": 360, "D_mm": 480, "B_mm": 118, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1830, "static_load_kN": 4500, "fatigue_load_limit_kN": 405, "max_rpm": 670, "reference_speed_rpm": 530, "limiting_speed_rpm": 670, "weight_g": 62000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 360 mm shaft, SKF lists NNC4972-CV as double-row full-complement cylindrical roller: 480 mm OD, 118 mm wide, Pu 405 kN, the catalogue lists 530 r/min thermal reference speed and 670 r/min mechanical limiting speed. Reading the NNC prefix: a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. This makes the execution two-direction locating — the retaining-ring configuration closes both axial escape paths. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Load-per-bore for the 360 mm seat is about 5.08 kN/mm, typical of dimension series 49 (compact heavy section); use C0 4500 kN for static checks such as crane hook blocks standing under load. Fit practice for NNC4972-CV: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks", "mining shovel and dragline pivots" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 118 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 1830/4500 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNC4972-CV?", "a": "SKF NNC 4972 CV is a double-row full-complement cylindrical roller bearing with 360 mm bore, 480 mm OD and 118 mm width per ISO 15. SKF lists C 1830 kN, C0 4500 kN, Pu 405 kN, reference speed 530 r/min and limiting speed 670 r/min, mass about 62000 g." }, { "q": "What does the NNC designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides." }, { "q": "Can NNC4972-CV take axial load and locate the shaft?", "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float." }, { "q": "How does NNC4972-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNCF4972-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 360×480×118 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4972-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 360×480×118 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNC4972-CV", "SKF NNC 4972 CV" ], "locale_variants": {} }, { "sku": "NNC4976-CV", "brand": "SKF", "manufacturer_designation": "SKF NNC 4976 CV", "series": "NNC4900-series", "type": "cylindrical_roller", "d_mm": 380, "D_mm": 520, "B_mm": 140, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 2380, "static_load_kN": 5700, "fatigue_load_limit_kN": 500, "max_rpm": 630, "reference_speed_rpm": 500, "limiting_speed_rpm": 630, "weight_g": 92500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NNC4976-CV is the 380 mm bore entry in the NNC4900 range: a 380×520×140 mm double-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 2380 kN / C0 5700 kN. Reading the NNC prefix: a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. This makes the execution two-direction locating — the retaining-ring configuration closes both axial escape paths. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 380 mm seat is about 6.26 kN/mm, typical of dimension series 49 (compact heavy section); use C0 5700 kN for static checks such as crane hook blocks standing under load. Fit practice for NNC4976-CV: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "large offshore winch and hook blocks", "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 140 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 140 mm-wide ring and concentrates load.", "The 2380/5700 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNC4976-CV?", "a": "SKF NNC 4976 CV is a double-row full-complement cylindrical roller bearing with 380 mm bore, 520 mm OD and 140 mm width per ISO 15. SKF lists C 2380 kN, C0 5700 kN, Pu 500 kN, reference speed 500 r/min and limiting speed 630 r/min, mass about 92500 g." }, { "q": "What does the NNC designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides." }, { "q": "Can NNC4976-CV take axial load and locate the shaft?", "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float." }, { "q": "How does NNC4976-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNCF4976-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 380×520×140 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4976-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 380×520×140 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNC4976-CV", "SKF NNC 4976 CV" ], "locale_variants": {} }, { "sku": "NNC4980-CV", "brand": "SKF", "manufacturer_designation": "SKF NNC 4980 CV", "series": "NNC4900-series", "type": "cylindrical_roller", "d_mm": 400, "D_mm": 540, "B_mm": 140, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 2420, "static_load_kN": 6000, "fatigue_load_limit_kN": 520, "max_rpm": 600, "reference_speed_rpm": 480, "limiting_speed_rpm": 600, "weight_g": 96500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NNC 4980 CV resolves to a 400×540×140 mm double-row full-complement cylindrical roller bearing (dimension series 49 (compact heavy section)); a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. Structurally, the NNC design has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides. In arrangement terms it is two-direction locating — the retaining-ring configuration closes both axial escape paths. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The radial section height is 70.0 mm and the catalogue mass 96500 g; at 2420 kN dynamic rating this is roughly 6.05 kN of C per millimetre of bore before application factors. Mounting: check both retaining rings are seated in their grooves before installation; axial guidance in both directions makes this the locating pair member, so the mating bearing must float. A 400 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks", "mining shovel and dragline pivots" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 540 mm raceway.", "The 2420/6000 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNC4980-CV?", "a": "SKF NNC 4980 CV is a double-row full-complement cylindrical roller bearing with 400 mm bore, 540 mm OD and 140 mm width per ISO 15. SKF lists C 2420 kN, C0 6000 kN, Pu 520 kN, reference speed 480 r/min and limiting speed 600 r/min, mass about 96500 g." }, { "q": "What does the NNC designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral inner-ring flanges and two retaining rings holding the outer ring on both sides." }, { "q": "Can NNC4980-CV take axial load and locate the shaft?", "a": "Yes, in both directions, because retaining rings close both sides of the outer ring; the paired bearing must then float." }, { "q": "How does NNC4980-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNCF4980-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 400×540×140 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4980-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 400×540×140 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNC4980-CV", "SKF NNC 4980 CV" ], "locale_variants": {} }, { "sku": "NNCF4830-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 4830 CV", "series": "NNCF4800-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 190, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 255, "static_load_kN": 585, "fatigue_load_limit_kN": 60, "max_rpm": 1800, "reference_speed_rpm": 1500, "limiting_speed_rpm": 1800, "weight_g": 2800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NNCF 4830 CV is a double-row full-complement cylindrical roller bearing sized 150×190×40 mm — a dimension series 48 (compact heavy section), listed in SKF catalogue PUB BU/P1 17000 ch. 6.4. Reading the NNCF prefix: a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. This makes the execution one-direction locating: the retained outer ring guides the shaft axially in one direction. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. With C 255 kN and C0 585 kN, size the bearing on the 150×190 mm ISO 15 envelope and check the 60 kN Pu against the equivalent-load floor; the catalogue lists 1,500 r/min thermal reference speed and 1,800 r/min mechanical limiting speed. Assembly note: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks", "mining shovel and dragline pivots" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 40 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 255/585 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF4830-CV?", "a": "SKF NNCF 4830 CV is a double-row full-complement cylindrical roller bearing with 150 mm bore, 190 mm OD and 40 mm width per ISO 15. SKF lists C 255 kN, C0 585 kN, Pu 60 kN, reference speed 1,500 r/min and limiting speed 1,800 r/min, mass about 2800 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF4830-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF4830-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4830-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 150×190×40 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4830-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 150×190×40 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF4830-CV", "SKF NNCF 4830 CV" ], "locale_variants": {} }, { "sku": "NNCF4832-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 4832 CV", "series": "NNCF4800-series", "type": "cylindrical_roller", "d_mm": 160, "D_mm": 200, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 260, "static_load_kN": 610, "fatigue_load_limit_kN": 62, "max_rpm": 1700, "reference_speed_rpm": 1400, "limiting_speed_rpm": 1700, "weight_g": 3000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NNCF 4832 CV resolves to a 160×200×40 mm double-row full-complement cylindrical roller bearing (dimension series 48 (compact heavy section)); a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. Reading the NNCF prefix: a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. This makes the execution one-direction locating: the retained outer ring guides the shaft axially in one direction. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The radial section height is 20.0 mm and the catalogue mass 3000 g; at 260 kN dynamic rating this is roughly 1.63 kN of C per millimetre of bore before application factors. Fit practice for NNCF4832-CV: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "large offshore winch and hook blocks", "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 40 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 40 mm-wide ring and concentrates load.", "The 260/610 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF4832-CV?", "a": "SKF NNCF 4832 CV is a double-row full-complement cylindrical roller bearing with 160 mm bore, 200 mm OD and 40 mm width per ISO 15. SKF lists C 260 kN, C0 610 kN, Pu 62 kN, reference speed 1,400 r/min and limiting speed 1,700 r/min, mass about 3000 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF4832-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF4832-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4832-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 160×200×40 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4832-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 160×200×40 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF4832-CV", "SKF NNCF 4832 CV" ], "locale_variants": {} }, { "sku": "NNCF4834-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 4834 CV", "series": "NNCF4800-series", "type": "cylindrical_roller", "d_mm": 170, "D_mm": 215, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 286, "static_load_kN": 655, "fatigue_load_limit_kN": 65.5, "max_rpm": 1600, "reference_speed_rpm": 1300, "limiting_speed_rpm": 1600, "weight_g": 4000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 170 mm shaft, SKF lists NNCF4834-CV as double-row full-complement cylindrical roller: 215 mm OD, 45 mm wide, Pu 65.5 kN, the catalogue lists 1,300 r/min thermal reference speed and 1,600 r/min mechanical limiting speed. Reading the NNCF prefix: a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. This makes the execution one-direction locating: the retained outer ring guides the shaft axially in one direction. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. The radial section height is 22.5 mm and the catalogue mass 4000 g; at 286 kN dynamic rating this is roughly 1.68 kN of C per millimetre of bore before application factors. Fit practice for NNCF4834-CV: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks", "mining shovel and dragline pivots" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 45 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 286/655 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF4834-CV?", "a": "SKF NNCF 4834 CV is a double-row full-complement cylindrical roller bearing with 170 mm bore, 215 mm OD and 45 mm width per ISO 15. SKF lists C 286 kN, C0 655 kN, Pu 65.5 kN, reference speed 1,300 r/min and limiting speed 1,600 r/min, mass about 4000 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF4834-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF4834-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4834-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 170×215×45 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4834-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 170×215×45 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF4834-CV", "SKF NNCF 4834 CV" ], "locale_variants": {} }, { "sku": "NNCF4836-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 4836 CV", "series": "NNCF4800-series", "type": "cylindrical_roller", "d_mm": 180, "D_mm": 225, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 297, "static_load_kN": 695, "fatigue_load_limit_kN": 69.5, "max_rpm": 1500, "reference_speed_rpm": 1200, "limiting_speed_rpm": 1500, "weight_g": 4200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NNCF 4836 CV denotes a double-row full-complement cylindrical roller bearing on the ISO 15 180×225×45 mm envelope, dimension series 48 (compact heavy section), with catalogue mass 4200 g. Reading the NNCF prefix: a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. This makes the execution one-direction locating: the retained outer ring guides the shaft axially in one direction. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. The radial section height is 22.5 mm and the catalogue mass 4200 g; at 297 kN dynamic rating this is roughly 1.65 kN of C per millimetre of bore before application factors. Fit practice for NNCF4836-CV: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 45 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 225 mm raceway.", "The 297/695 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF4836-CV?", "a": "SKF NNCF 4836 CV is a double-row full-complement cylindrical roller bearing with 180 mm bore, 225 mm OD and 45 mm width per ISO 15. SKF lists C 297 kN, C0 695 kN, Pu 69.5 kN, reference speed 1,200 r/min and limiting speed 1,500 r/min, mass about 4200 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF4836-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF4836-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4836-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 180×225×45 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4836-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 180×225×45 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF4836-CV", "SKF NNCF 4836 CV" ], "locale_variants": {} }, { "sku": "NNCF4838-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 4838 CV", "series": "NNCF4800-series", "type": "cylindrical_roller", "d_mm": 190, "D_mm": 240, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 358, "static_load_kN": 750, "fatigue_load_limit_kN": 76.5, "max_rpm": 1400, "reference_speed_rpm": 1100, "limiting_speed_rpm": 1400, "weight_g": 5500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NNCF4838-CV is the 190 mm bore entry in the NNCF4800 range: a 190×240×50 mm double-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 358 kN / C0 750 kN. Reading the NNCF prefix: a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. This makes the execution one-direction locating: the retained outer ring guides the shaft axially in one direction. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The radial section height is 25.0 mm and the catalogue mass 5500 g; at 358 kN dynamic rating this is roughly 1.88 kN of C per millimetre of bore before application factors. Fit practice for NNCF4838-CV: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "large offshore winch and hook blocks", "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 50 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 50 mm-wide ring and concentrates load.", "The 358/750 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF4838-CV?", "a": "SKF NNCF 4838 CV is a double-row full-complement cylindrical roller bearing with 190 mm bore, 240 mm OD and 50 mm width per ISO 15. SKF lists C 358 kN, C0 750 kN, Pu 76.5 kN, reference speed 1,100 r/min and limiting speed 1,400 r/min, mass about 5500 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF4838-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF4838-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4838-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 190×240×50 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4838-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 190×240×50 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF4838-CV", "SKF NNCF 4838 CV" ], "locale_variants": {} }, { "sku": "NNCF4840-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 4840 CV", "series": "NNCF4800-series", "type": "cylindrical_roller", "d_mm": 200, "D_mm": 250, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 369, "static_load_kN": 800, "fatigue_load_limit_kN": 80, "max_rpm": 1400, "reference_speed_rpm": 1100, "limiting_speed_rpm": 1400, "weight_g": 5800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NNCF 4840 CV denotes a double-row full-complement cylindrical roller bearing on the ISO 15 200×250×50 mm envelope, dimension series 48 (compact heavy section), with catalogue mass 5800 g. Structurally, the NNCF design has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. In arrangement terms it is one-direction locating: the retained outer ring guides the shaft axially in one direction. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Speed planning for NNCF4840-CV: the catalogue lists 1,100 r/min thermal reference speed and 1,400 r/min mechanical limiting speed. The mass entry 5800 g covers the complete catalogue execution. Fit practice for NNCF4840-CV: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "large offshore winch and hook blocks", "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 369/800 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF4840-CV?", "a": "SKF NNCF 4840 CV is a double-row full-complement cylindrical roller bearing with 200 mm bore, 250 mm OD and 50 mm width per ISO 15. SKF lists C 369 kN, C0 800 kN, Pu 80 kN, reference speed 1,100 r/min and limiting speed 1,400 r/min, mass about 5800 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF4840-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF4840-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4840-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 200×250×50 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4840-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 200×250×50 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF4840-CV", "SKF NNCF 4840 CV" ], "locale_variants": {} }, { "sku": "NNCF4844-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 4844 CV", "series": "NNCF4800-series", "type": "cylindrical_roller", "d_mm": 220, "D_mm": 270, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 380, "static_load_kN": 865, "fatigue_load_limit_kN": 85, "max_rpm": 1200, "reference_speed_rpm": 1000, "limiting_speed_rpm": 1200, "weight_g": 6300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NNCF 4844 CV is a double-row full-complement cylindrical roller bearing sized 220×270×50 mm — a dimension series 48 (compact heavy section), listed in SKF catalogue PUB BU/P1 17000 ch. 6.4. Structurally, the NNCF design has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. In arrangement terms it is one-direction locating: the retained outer ring guides the shaft axially in one direction. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. With C 380 kN and C0 865 kN, size the bearing on the 220×270 mm ISO 15 envelope and check the 85 kN Pu against the equivalent-load floor; the catalogue lists 1,000 r/min thermal reference speed and 1,200 r/min mechanical limiting speed. Mounting: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. A 220 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "large offshore winch and hook blocks", "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 380/865 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF4844-CV?", "a": "SKF NNCF 4844 CV is a double-row full-complement cylindrical roller bearing with 220 mm bore, 270 mm OD and 50 mm width per ISO 15. SKF lists C 380 kN, C0 865 kN, Pu 85 kN, reference speed 1,000 r/min and limiting speed 1,200 r/min, mass about 6300 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF4844-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF4844-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4844-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 220×270×50 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4844-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 220×270×50 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF4844-CV", "SKF NNCF 4844 CV" ], "locale_variants": {} }, { "sku": "NNCF4848-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 4848 CV", "series": "NNCF4800-series", "type": "cylindrical_roller", "d_mm": 240, "D_mm": 300, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 539, "static_load_kN": 1290, "fatigue_load_limit_kN": 125, "max_rpm": 1100, "reference_speed_rpm": 900, "limiting_speed_rpm": 1100, "weight_g": 9900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 240 mm shaft, SKF lists NNCF4848-CV as double-row full-complement cylindrical roller: 300 mm OD, 60 mm wide, Pu 125 kN, the catalogue lists 900 r/min thermal reference speed and 1,100 r/min mechanical limiting speed. Structurally, the NNCF design has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. In arrangement terms it is one-direction locating: the retained outer ring guides the shaft axially in one direction. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. With C 539 kN and C0 1290 kN, size the bearing on the 240×300 mm ISO 15 envelope and check the 125 kN Pu against the equivalent-load floor; the catalogue lists 900 r/min thermal reference speed and 1,100 r/min mechanical limiting speed. Mounting: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. A 240 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 60 mm-wide ring and concentrates load.", "The 539/1290 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF4848-CV?", "a": "SKF NNCF 4848 CV is a double-row full-complement cylindrical roller bearing with 240 mm bore, 300 mm OD and 60 mm width per ISO 15. SKF lists C 539 kN, C0 1290 kN, Pu 125 kN, reference speed 900 r/min and limiting speed 1,100 r/min, mass about 9900 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF4848-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF4848-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4848-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 240×300×60 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4848-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 240×300×60 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF4848-CV", "SKF NNCF 4848 CV" ], "locale_variants": {} }, { "sku": "NNCF4852-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 4852 CV", "series": "NNCF4800-series", "type": "cylindrical_roller", "d_mm": 260, "D_mm": 320, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 561, "static_load_kN": 1400, "fatigue_load_limit_kN": 132, "max_rpm": 1000, "reference_speed_rpm": 800, "limiting_speed_rpm": 1000, "weight_g": 11000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NNCF4852-CV is the 260 mm bore entry in the NNCF4800 range: a 260×320×60 mm double-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 561 kN / C0 1400 kN. The NNCF configuration means a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes; functionally the bearing is one-direction locating: the retained outer ring guides the shaft axially in one direction. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Speed planning for NNCF4852-CV: the catalogue lists 800 r/min thermal reference speed and 1,000 r/min mechanical limiting speed. The mass entry 11000 g covers the complete catalogue execution. Fit practice for NNCF4852-CV: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks", "mining shovel and dragline pivots" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 320 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 60 mm-wide ring and concentrates load.", "The 561/1400 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF4852-CV?", "a": "SKF NNCF 4852 CV is a double-row full-complement cylindrical roller bearing with 260 mm bore, 320 mm OD and 60 mm width per ISO 15. SKF lists C 561 kN, C0 1400 kN, Pu 132 kN, reference speed 800 r/min and limiting speed 1,000 r/min, mass about 11000 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF4852-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF4852-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4852-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 260×320×60 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4852-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 260×320×60 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF4852-CV", "SKF NNCF 4852 CV" ], "locale_variants": {} }, { "sku": "NNCF4856-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 4856 CV", "series": "NNCF4800-series", "type": "cylindrical_roller", "d_mm": 280, "D_mm": 350, "B_mm": 69, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 737, "static_load_kN": 1860, "fatigue_load_limit_kN": 173, "max_rpm": 950, "reference_speed_rpm": 750, "limiting_speed_rpm": 950, "weight_g": 16000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NNCF 4856 CV resolves to a 280×350×69 mm double-row full-complement cylindrical roller bearing (dimension series 48 (compact heavy section)); a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. The NNCF configuration means a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes; functionally the bearing is one-direction locating: the retained outer ring guides the shaft axially in one direction. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Speed planning for NNCF4856-CV: the catalogue lists 750 r/min thermal reference speed and 950 r/min mechanical limiting speed. The mass entry 16000 g covers the complete catalogue execution. Fit practice for NNCF4856-CV: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "large offshore winch and hook blocks", "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 350 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 350 mm raceway.", "The 737/1860 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF4856-CV?", "a": "SKF NNCF 4856 CV is a double-row full-complement cylindrical roller bearing with 280 mm bore, 350 mm OD and 69 mm width per ISO 15. SKF lists C 737 kN, C0 1860 kN, Pu 173 kN, reference speed 750 r/min and limiting speed 950 r/min, mass about 16000 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF4856-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF4856-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4856-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 280×350×69 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4856-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 280×350×69 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF4856-CV", "SKF NNCF 4856 CV" ], "locale_variants": {} }, { "sku": "NNCF4860-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 4860 CV", "series": "NNCF4800-series", "type": "cylindrical_roller", "d_mm": 300, "D_mm": 380, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 858, "static_load_kN": 2120, "fatigue_load_limit_kN": 196, "max_rpm": 850, "reference_speed_rpm": 700, "limiting_speed_rpm": 850, "weight_g": 22500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NNCF 4860 CV resolves to a 300×380×80 mm double-row full-complement cylindrical roller bearing (dimension series 48 (compact heavy section)); a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. Reading the NNCF prefix: a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. This makes the execution one-direction locating: the retained outer ring guides the shaft axially in one direction. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 2.47 (2120 against 858 kN), and the Pu figure 196 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 700 r/min thermal reference speed and 850 r/min mechanical limiting speed. Fit practice for NNCF4860-CV: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks", "mining shovel and dragline pivots" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 80 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 858/2120 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF4860-CV?", "a": "SKF NNCF 4860 CV is a double-row full-complement cylindrical roller bearing with 300 mm bore, 380 mm OD and 80 mm width per ISO 15. SKF lists C 858 kN, C0 2120 kN, Pu 196 kN, reference speed 700 r/min and limiting speed 850 r/min, mass about 22500 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF4860-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF4860-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4860-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 300×380×80 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4860-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 300×380×80 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF4860-CV", "SKF NNCF 4860 CV" ], "locale_variants": {} }, { "sku": "NNCF4864-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 4864 CV", "series": "NNCF4800-series", "type": "cylindrical_roller", "d_mm": 320, "D_mm": 400, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 897, "static_load_kN": 2280, "fatigue_load_limit_kN": 208, "max_rpm": 800, "reference_speed_rpm": 630, "limiting_speed_rpm": 800, "weight_g": 23500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NNCF 4864 CV denotes a double-row full-complement cylindrical roller bearing on the ISO 15 320×400×80 mm envelope, dimension series 48 (compact heavy section), with catalogue mass 23500 g. Reading the NNCF prefix: a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. This makes the execution one-direction locating: the retained outer ring guides the shaft axially in one direction. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 320 mm seat is about 2.80 kN/mm, typical of dimension series 48 (compact heavy section); use C0 2280 kN for static checks such as crane hook blocks standing under load. Mounting: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. A 320 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks", "mining shovel and dragline pivots" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 80 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 897/2280 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF4864-CV?", "a": "SKF NNCF 4864 CV is a double-row full-complement cylindrical roller bearing with 320 mm bore, 400 mm OD and 80 mm width per ISO 15. SKF lists C 897 kN, C0 2280 kN, Pu 208 kN, reference speed 630 r/min and limiting speed 800 r/min, mass about 23500 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF4864-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF4864-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4864-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 320×400×80 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4864-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 320×400×80 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF4864-CV", "SKF NNCF 4864 CV" ], "locale_variants": {} }, { "sku": "NNCF4868-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 4868 CV", "series": "NNCF4800-series", "type": "cylindrical_roller", "d_mm": 340, "D_mm": 420, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 913, "static_load_kN": 2400, "fatigue_load_limit_kN": 216, "max_rpm": 750, "reference_speed_rpm": 600, "limiting_speed_rpm": 750, "weight_g": 25000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NNCF 4868 CV is a double-row full-complement cylindrical roller bearing sized 340×420×80 mm — a dimension series 48 (compact heavy section), listed in SKF catalogue PUB BU/P1 17000 ch. 6.4. Reading the NNCF prefix: a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. This makes the execution one-direction locating: the retained outer ring guides the shaft axially in one direction. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Speed planning for NNCF4868-CV: the catalogue lists 600 r/min thermal reference speed and 750 r/min mechanical limiting speed. The mass entry 25000 g covers the complete catalogue execution. Assembly note: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks", "mining shovel and dragline pivots" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 80 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 913/2400 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF4868-CV?", "a": "SKF NNCF 4868 CV is a double-row full-complement cylindrical roller bearing with 340 mm bore, 420 mm OD and 80 mm width per ISO 15. SKF lists C 913 kN, C0 2400 kN, Pu 216 kN, reference speed 600 r/min and limiting speed 750 r/min, mass about 25000 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF4868-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF4868-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4868-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 340×420×80 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4868-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 340×420×80 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF4868-CV", "SKF NNCF 4868 CV" ], "locale_variants": {} }, { "sku": "NNCF4872-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 4872 CV", "series": "NNCF4800-series", "type": "cylindrical_roller", "d_mm": 360, "D_mm": 440, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 935, "static_load_kN": 2550, "fatigue_load_limit_kN": 224, "max_rpm": 700, "reference_speed_rpm": 560, "limiting_speed_rpm": 700, "weight_g": 26500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 360 mm shaft, SKF lists NNCF4872-CV as double-row full-complement cylindrical roller: 440 mm OD, 80 mm wide, Pu 224 kN, the catalogue lists 560 r/min thermal reference speed and 700 r/min mechanical limiting speed. Structurally, the NNCF design has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. In arrangement terms it is one-direction locating: the retained outer ring guides the shaft axially in one direction. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 2.73 (2550 against 935 kN), and the Pu figure 224 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 560 r/min thermal reference speed and 700 r/min mechanical limiting speed. Fit practice for NNCF4872-CV: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 80 mm-wide ring and concentrates load.", "The 935/2550 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF4872-CV?", "a": "SKF NNCF 4872 CV is a double-row full-complement cylindrical roller bearing with 360 mm bore, 440 mm OD and 80 mm width per ISO 15. SKF lists C 935 kN, C0 2550 kN, Pu 224 kN, reference speed 560 r/min and limiting speed 700 r/min, mass about 26500 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF4872-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF4872-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4872-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 360×440×80 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4872-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 360×440×80 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF4872-CV", "SKF NNCF 4872 CV" ], "locale_variants": {} }, { "sku": "NNCF4876-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 4876 CV", "series": "NNCF4800-series", "type": "cylindrical_roller", "d_mm": 380, "D_mm": 480, "B_mm": 100, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1400, "static_load_kN": 3650, "fatigue_load_limit_kN": 315, "max_rpm": 670, "reference_speed_rpm": 530, "limiting_speed_rpm": 670, "weight_g": 45000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NNCF4876-CV is the 380 mm bore entry in the NNCF4800 range: a 380×480×100 mm double-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 1400 kN / C0 3650 kN. Structurally, the NNCF design has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. In arrangement terms it is one-direction locating: the retained outer ring guides the shaft axially in one direction. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 2.61 (3650 against 1400 kN), and the Pu figure 315 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 530 r/min thermal reference speed and 670 r/min mechanical limiting speed. Fit practice for NNCF4876-CV: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks", "mining shovel and dragline pivots" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 480 mm raceway.", "The 1400/3650 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF4876-CV?", "a": "SKF NNCF 4876 CV is a double-row full-complement cylindrical roller bearing with 380 mm bore, 480 mm OD and 100 mm width per ISO 15. SKF lists C 1400 kN, C0 3650 kN, Pu 315 kN, reference speed 530 r/min and limiting speed 670 r/min, mass about 45000 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF4876-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF4876-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4876-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 380×480×100 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4876-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 380×480×100 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF4876-CV", "SKF NNCF 4876 CV" ], "locale_variants": {} }, { "sku": "NNCF4880-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 4880 CV", "series": "NNCF4800-series", "type": "cylindrical_roller", "d_mm": 400, "D_mm": 500, "B_mm": 100, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1420, "static_load_kN": 3750, "fatigue_load_limit_kN": 325, "max_rpm": 630, "reference_speed_rpm": 500, "limiting_speed_rpm": 630, "weight_g": 46000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NNCF4880-CV is the 400 mm bore entry in the NNCF4800 range: a 400×500×100 mm double-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 1420 kN / C0 3750 kN. Reading the NNCF prefix: a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. This makes the execution one-direction locating: the retained outer ring guides the shaft axially in one direction. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. With C 1420 kN and C0 3750 kN, size the bearing on the 400×500 mm ISO 15 envelope and check the 325 kN Pu against the equivalent-load floor; the catalogue lists 500 r/min thermal reference speed and 630 r/min mechanical limiting speed. Mounting: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. A 400 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 100 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 500 mm raceway.", "The 1420/3750 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF4880-CV?", "a": "SKF NNCF 4880 CV is a double-row full-complement cylindrical roller bearing with 400 mm bore, 500 mm OD and 100 mm width per ISO 15. SKF lists C 1420 kN, C0 3750 kN, Pu 325 kN, reference speed 500 r/min and limiting speed 630 r/min, mass about 46000 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF4880-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF4880-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4880-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 400×500×100 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4880-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 400×500×100 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF4880-CV", "SKF NNCF 4880 CV" ], "locale_variants": {} }, { "sku": "NNCF4912-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 4912 CV", "series": "NNCF4900-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 85, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 78.1, "static_load_kN": 137, "fatigue_load_limit_kN": 14.3, "max_rpm": 4500, "reference_speed_rpm": 3600, "limiting_speed_rpm": 4500, "weight_g": 480, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 60 mm shaft, SKF lists NNCF4912-CV as double-row full-complement cylindrical roller: 85 mm OD, 25 mm wide, Pu 14.3 kN, the catalogue lists 3,600 r/min thermal reference speed and 4,500 r/min mechanical limiting speed. Structurally, the NNCF design has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. In arrangement terms it is one-direction locating: the retained outer ring guides the shaft axially in one direction. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 1.75 (137 against 78.1 kN), and the Pu figure 14.3 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 3,600 r/min thermal reference speed and 4,500 r/min mechanical limiting speed. Fit practice for NNCF4912-CV: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "heavy material-handling rope pulleys", "rolling-mill and caster drives", "large crane and winch drums", "offshore crane sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 78.1/137 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF4912-CV?", "a": "SKF NNCF 4912 CV is a double-row full-complement cylindrical roller bearing with 60 mm bore, 85 mm OD and 25 mm width per ISO 15. SKF lists C 78.1 kN, C0 137 kN, Pu 14.3 kN, reference speed 3,600 r/min and limiting speed 4,500 r/min, mass about 480 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF4912-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF4912-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4912-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 60×85×25 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4912-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 60×85×25 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF4912-CV", "SKF NNCF 4912 CV" ], "locale_variants": {} }, { "sku": "NNCF4914-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 4914 CV", "series": "NNCF4900-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 100, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 114, "static_load_kN": 193, "fatigue_load_limit_kN": 22.4, "max_rpm": 3800, "reference_speed_rpm": 3000, "limiting_speed_rpm": 3800, "weight_g": 770, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NNCF 4914 CV denotes a double-row full-complement cylindrical roller bearing on the ISO 15 70×100×30 mm envelope, dimension series 49 (compact heavy section), with catalogue mass 770 g. Structurally, the NNCF design has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. In arrangement terms it is one-direction locating: the retained outer ring guides the shaft axially in one direction. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 1.69 (193 against 114 kN), and the Pu figure 22.4 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 3,000 r/min thermal reference speed and 3,800 r/min mechanical limiting speed. Fit practice for NNCF4914-CV: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "offshore crane sheaves", "heavy material-handling rope pulleys", "rolling-mill and caster drives", "large crane and winch drums" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 100 mm raceway.", "The 114/193 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF4914-CV?", "a": "SKF NNCF 4914 CV is a double-row full-complement cylindrical roller bearing with 70 mm bore, 100 mm OD and 30 mm width per ISO 15. SKF lists C 114 kN, C0 193 kN, Pu 22.4 kN, reference speed 3,000 r/min and limiting speed 3,800 r/min, mass about 770 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF4914-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF4914-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4914-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 70×100×30 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4914-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 70×100×30 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF4914-CV", "SKF NNCF 4914 CV" ], "locale_variants": {} }, { "sku": "NNCF4916-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 4916 CV", "series": "NNCF4900-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 110, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 121, "static_load_kN": 216, "fatigue_load_limit_kN": 25, "max_rpm": 3400, "reference_speed_rpm": 2600, "limiting_speed_rpm": 3400, "weight_g": 870, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NNCF4916-CV is the 80 mm bore entry in the NNCF4900 range: a 80×110×30 mm double-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 121 kN / C0 216 kN. Structurally, the NNCF design has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. In arrangement terms it is one-direction locating: the retained outer ring guides the shaft axially in one direction. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 80 mm seat is about 1.51 kN/mm, typical of dimension series 49 (compact heavy section); use C0 216 kN for static checks such as crane hook blocks standing under load. Mounting: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. A 80 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "rolling-mill and caster drives", "large crane and winch drums", "offshore crane sheaves", "heavy material-handling rope pulleys" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 121/216 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF4916-CV?", "a": "SKF NNCF 4916 CV is a double-row full-complement cylindrical roller bearing with 80 mm bore, 110 mm OD and 30 mm width per ISO 15. SKF lists C 121 kN, C0 216 kN, Pu 25 kN, reference speed 2,600 r/min and limiting speed 3,400 r/min, mass about 870 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF4916-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF4916-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4916-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 80×110×30 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4916-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 80×110×30 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF4916-CV", "SKF NNCF 4916 CV" ], "locale_variants": {} }, { "sku": "NNCF4918-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 4918 CV", "series": "NNCF4900-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 125, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 161, "static_load_kN": 300, "fatigue_load_limit_kN": 35.5, "max_rpm": 3000, "reference_speed_rpm": 2400, "limiting_speed_rpm": 3000, "weight_g": 1350, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NNCF 4918 CV is a double-row full-complement cylindrical roller bearing sized 90×125×35 mm — a dimension series 49 (compact heavy section), listed in SKF catalogue PUB BU/P1 17000 ch. 6.4. Structurally, the NNCF design has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. In arrangement terms it is one-direction locating: the retained outer ring guides the shaft axially in one direction. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 90 mm seat is about 1.79 kN/mm, typical of dimension series 49 (compact heavy section); use C0 300 kN for static checks such as crane hook blocks standing under load. Mounting: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. A 90 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "heavy material-handling rope pulleys", "rolling-mill and caster drives", "large crane and winch drums", "offshore crane sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 125 mm raceway.", "The 161/300 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF4918-CV?", "a": "SKF NNCF 4918 CV is a double-row full-complement cylindrical roller bearing with 90 mm bore, 125 mm OD and 35 mm width per ISO 15. SKF lists C 161 kN, C0 300 kN, Pu 35.5 kN, reference speed 2,400 r/min and limiting speed 3,000 r/min, mass about 1350 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF4918-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF4918-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4918-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 90×125×35 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4918-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 90×125×35 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF4918-CV", "SKF NNCF 4918 CV" ], "locale_variants": {} }, { "sku": "NNCF4920-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 4920 CV", "series": "NNCF4900-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 140, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 209, "static_load_kN": 400, "fatigue_load_limit_kN": 46.5, "max_rpm": 2600, "reference_speed_rpm": 2000, "limiting_speed_rpm": 2600, "weight_g": 1950, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NNCF4920-CV is the 100 mm bore entry in the NNCF4900 range: a 100×140×40 mm double-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 209 kN / C0 400 kN. The NNCF configuration means a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes; functionally the bearing is one-direction locating: the retained outer ring guides the shaft axially in one direction. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. The radial section height is 20.0 mm and the catalogue mass 1950 g; at 209 kN dynamic rating this is roughly 2.09 kN of C per millimetre of bore before application factors. Mounting: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. A 100 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "heavy material-handling rope pulleys", "rolling-mill and caster drives", "large crane and winch drums", "offshore crane sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 140 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 40 mm-wide ring and concentrates load.", "The 209/400 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF4920-CV?", "a": "SKF NNCF 4920 CV is a double-row full-complement cylindrical roller bearing with 100 mm bore, 140 mm OD and 40 mm width per ISO 15. SKF lists C 209 kN, C0 400 kN, Pu 46.5 kN, reference speed 2,000 r/min and limiting speed 2,600 r/min, mass about 1950 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF4920-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF4920-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4920-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 100×140×40 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4920-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 100×140×40 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF4920-CV", "SKF NNCF 4920 CV" ], "locale_variants": {} }, { "sku": "NNCF4922-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 4922 CV", "series": "NNCF4900-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 150, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 220, "static_load_kN": 430, "fatigue_load_limit_kN": 49, "max_rpm": 2400, "reference_speed_rpm": 1900, "limiting_speed_rpm": 2400, "weight_g": 2100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NNCF 4922 CV is a double-row full-complement cylindrical roller bearing sized 110×150×40 mm — a dimension series 49 (compact heavy section), listed in SKF catalogue PUB BU/P1 17000 ch. 6.4. The NNCF configuration means a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes; functionally the bearing is one-direction locating: the retained outer ring guides the shaft axially in one direction. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. The radial section height is 20.0 mm and the catalogue mass 2100 g; at 220 kN dynamic rating this is roughly 2.00 kN of C per millimetre of bore before application factors. Mounting: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. A 110 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "offshore crane sheaves", "heavy material-handling rope pulleys", "rolling-mill and caster drives", "large crane and winch drums" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 150 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 220/430 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF4922-CV?", "a": "SKF NNCF 4922 CV is a double-row full-complement cylindrical roller bearing with 110 mm bore, 150 mm OD and 40 mm width per ISO 15. SKF lists C 220 kN, C0 430 kN, Pu 49 kN, reference speed 1,900 r/min and limiting speed 2,400 r/min, mass about 2100 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF4922-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF4922-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4922-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 110×150×40 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4922-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 110×150×40 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF4922-CV", "SKF NNCF 4922 CV" ], "locale_variants": {} }, { "sku": "NNCF4924-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 4924 CV", "series": "NNCF4900-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 165, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 242, "static_load_kN": 480, "fatigue_load_limit_kN": 53, "max_rpm": 2200, "reference_speed_rpm": 1700, "limiting_speed_rpm": 2200, "weight_g": 2900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NNCF 4924 CV resolves to a 120×165×45 mm double-row full-complement cylindrical roller bearing (dimension series 49 (compact heavy section)); a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. The NNCF configuration means a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes; functionally the bearing is one-direction locating: the retained outer ring guides the shaft axially in one direction. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The radial section height is 22.5 mm and the catalogue mass 2900 g; at 242 kN dynamic rating this is roughly 2.02 kN of C per millimetre of bore before application factors. Mounting: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. A 120 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "large offshore winch and hook blocks", "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 165 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 165 mm raceway.", "The 242/480 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF4924-CV?", "a": "SKF NNCF 4924 CV is a double-row full-complement cylindrical roller bearing with 120 mm bore, 165 mm OD and 45 mm width per ISO 15. SKF lists C 242 kN, C0 480 kN, Pu 53 kN, reference speed 1,700 r/min and limiting speed 2,200 r/min, mass about 2900 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF4924-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF4924-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4924-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 120×165×45 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4924-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 120×165×45 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF4924-CV", "SKF NNCF 4924 CV" ], "locale_variants": {} }, { "sku": "NNCF4926-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 4926 CV", "series": "NNCF4900-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 180, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 297, "static_load_kN": 530, "fatigue_load_limit_kN": 60, "max_rpm": 2000, "reference_speed_rpm": 1600, "limiting_speed_rpm": 2000, "weight_g": 3900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 130 mm shaft, SKF lists NNCF4926-CV as double-row full-complement cylindrical roller: 180 mm OD, 50 mm wide, Pu 60 kN, the catalogue lists 1,600 r/min thermal reference speed and 2,000 r/min mechanical limiting speed. The NNCF configuration means a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes; functionally the bearing is one-direction locating: the retained outer ring guides the shaft axially in one direction. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 1.78 (530 against 297 kN), and the Pu figure 60 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 1,600 r/min thermal reference speed and 2,000 r/min mechanical limiting speed. Assembly note: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 180 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 297/530 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF4926-CV?", "a": "SKF NNCF 4926 CV is a double-row full-complement cylindrical roller bearing with 130 mm bore, 180 mm OD and 50 mm width per ISO 15. SKF lists C 297 kN, C0 530 kN, Pu 60 kN, reference speed 1,600 r/min and limiting speed 2,000 r/min, mass about 3900 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF4926-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF4926-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4926-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 130×180×50 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4926-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 130×180×50 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF4926-CV", "SKF NNCF 4926 CV" ], "locale_variants": {} }, { "sku": "NNCF4928-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 4928 CV", "series": "NNCF4900-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 190, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 308, "static_load_kN": 570, "fatigue_load_limit_kN": 63, "max_rpm": 1900, "reference_speed_rpm": 1500, "limiting_speed_rpm": 1900, "weight_g": 4150, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NNCF 4928 CV denotes a double-row full-complement cylindrical roller bearing on the ISO 15 140×190×50 mm envelope, dimension series 49 (compact heavy section), with catalogue mass 4150 g. The NNCF configuration means a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes; functionally the bearing is one-direction locating: the retained outer ring guides the shaft axially in one direction. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 1.85 (570 against 308 kN), and the Pu figure 63 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 1,500 r/min thermal reference speed and 1,900 r/min mechanical limiting speed. Assembly note: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "large offshore winch and hook blocks", "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 190 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 190 mm raceway.", "The 308/570 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF4928-CV?", "a": "SKF NNCF 4928 CV is a double-row full-complement cylindrical roller bearing with 140 mm bore, 190 mm OD and 50 mm width per ISO 15. SKF lists C 308 kN, C0 570 kN, Pu 63 kN, reference speed 1,500 r/min and limiting speed 1,900 r/min, mass about 4150 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF4928-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF4928-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4928-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 140×190×50 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4928-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 140×190×50 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF4928-CV", "SKF NNCF 4928 CV" ], "locale_variants": {} }, { "sku": "NNCF4930-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 4930 CV", "series": "NNCF4900-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 210, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 429, "static_load_kN": 830, "fatigue_load_limit_kN": 91.5, "max_rpm": 1700, "reference_speed_rpm": 1400, "limiting_speed_rpm": 1700, "weight_g": 6550, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 150 mm shaft, SKF lists NNCF4930-CV as double-row full-complement cylindrical roller: 210 mm OD, 60 mm wide, Pu 91.5 kN, the catalogue lists 1,400 r/min thermal reference speed and 1,700 r/min mechanical limiting speed. Reading the NNCF prefix: a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. This makes the execution one-direction locating: the retained outer ring guides the shaft axially in one direction. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. With C 429 kN and C0 830 kN, size the bearing on the 150×210 mm ISO 15 envelope and check the 91.5 kN Pu against the equivalent-load floor; the catalogue lists 1,400 r/min thermal reference speed and 1,700 r/min mechanical limiting speed. Assembly note: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "large offshore winch and hook blocks", "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 60 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 60 mm-wide ring and concentrates load.", "The 429/830 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF4930-CV?", "a": "SKF NNCF 4930 CV is a double-row full-complement cylindrical roller bearing with 150 mm bore, 210 mm OD and 60 mm width per ISO 15. SKF lists C 429 kN, C0 830 kN, Pu 91.5 kN, reference speed 1,400 r/min and limiting speed 1,700 r/min, mass about 6550 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF4930-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF4930-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4930-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 150×210×60 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4930-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 150×210×60 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF4930-CV", "SKF NNCF 4930 CV" ], "locale_variants": {} }, { "sku": "NNCF4932-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 4932 CV", "series": "NNCF4900-series", "type": "cylindrical_roller", "d_mm": 160, "D_mm": 220, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 446, "static_load_kN": 915, "fatigue_load_limit_kN": 96.5, "max_rpm": 1600, "reference_speed_rpm": 1300, "limiting_speed_rpm": 1600, "weight_g": 6900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NNCF 4932 CV denotes a double-row full-complement cylindrical roller bearing on the ISO 15 160×220×60 mm envelope, dimension series 49 (compact heavy section), with catalogue mass 6900 g. Reading the NNCF prefix: a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. This makes the execution one-direction locating: the retained outer ring guides the shaft axially in one direction. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. With C 446 kN and C0 915 kN, size the bearing on the 160×220 mm ISO 15 envelope and check the 96.5 kN Pu against the equivalent-load floor; the catalogue lists 1,300 r/min thermal reference speed and 1,600 r/min mechanical limiting speed. Assembly note: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks", "mining shovel and dragline pivots" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 60 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 446/915 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF4932-CV?", "a": "SKF NNCF 4932 CV is a double-row full-complement cylindrical roller bearing with 160 mm bore, 220 mm OD and 60 mm width per ISO 15. SKF lists C 446 kN, C0 915 kN, Pu 96.5 kN, reference speed 1,300 r/min and limiting speed 1,600 r/min, mass about 6900 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF4932-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF4932-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4932-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 160×220×60 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4932-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 160×220×60 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF4932-CV", "SKF NNCF 4932 CV" ], "locale_variants": {} }, { "sku": "NNCF4934-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 4934 CV", "series": "NNCF4900-series", "type": "cylindrical_roller", "d_mm": 170, "D_mm": 230, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 457, "static_load_kN": 950, "fatigue_load_limit_kN": 100, "max_rpm": 1500, "reference_speed_rpm": 1200, "limiting_speed_rpm": 1500, "weight_g": 7200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NNCF4934-CV is the 170 mm bore entry in the NNCF4900 range: a 170×230×60 mm double-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 457 kN / C0 950 kN. Reading the NNCF prefix: a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. This makes the execution one-direction locating: the retained outer ring guides the shaft axially in one direction. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The radial section height is 30.0 mm and the catalogue mass 7200 g; at 457 kN dynamic rating this is roughly 2.69 kN of C per millimetre of bore before application factors. Fit practice for NNCF4934-CV: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "large offshore winch and hook blocks", "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 60 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 60 mm-wide ring and concentrates load.", "The 457/950 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF4934-CV?", "a": "SKF NNCF 4934 CV is a double-row full-complement cylindrical roller bearing with 170 mm bore, 230 mm OD and 60 mm width per ISO 15. SKF lists C 457 kN, C0 950 kN, Pu 100 kN, reference speed 1,200 r/min and limiting speed 1,500 r/min, mass about 7200 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF4934-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF4934-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4934-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 170×230×60 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4934-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 170×230×60 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF4934-CV", "SKF NNCF 4934 CV" ], "locale_variants": {} }, { "sku": "NNCF4936-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 4936 CV", "series": "NNCF4900-series", "type": "cylindrical_roller", "d_mm": 180, "D_mm": 250, "B_mm": 69, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 594, "static_load_kN": 1220, "fatigue_load_limit_kN": 127, "max_rpm": 1400, "reference_speed_rpm": 1100, "limiting_speed_rpm": 1400, "weight_g": 10500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NNCF 4936 CV is a double-row full-complement cylindrical roller bearing sized 180×250×69 mm — a dimension series 49 (compact heavy section), listed in SKF catalogue PUB BU/P1 17000 ch. 6.4. Reading the NNCF prefix: a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. This makes the execution one-direction locating: the retained outer ring guides the shaft axially in one direction. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. The radial section height is 35.0 mm and the catalogue mass 10500 g; at 594 kN dynamic rating this is roughly 3.30 kN of C per millimetre of bore before application factors. Fit practice for NNCF4936-CV: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks", "mining shovel and dragline pivots" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 69 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 594/1220 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF4936-CV?", "a": "SKF NNCF 4936 CV is a double-row full-complement cylindrical roller bearing with 180 mm bore, 250 mm OD and 69 mm width per ISO 15. SKF lists C 594 kN, C0 1220 kN, Pu 127 kN, reference speed 1,100 r/min and limiting speed 1,400 r/min, mass about 10500 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF4936-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF4936-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4936-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 180×250×69 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4936-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 180×250×69 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF4936-CV", "SKF NNCF 4936 CV" ], "locale_variants": {} }, { "sku": "NNCF4938-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 4938 CV", "series": "NNCF4900-series", "type": "cylindrical_roller", "d_mm": 190, "D_mm": 260, "B_mm": 69, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 605, "static_load_kN": 1290, "fatigue_load_limit_kN": 132, "max_rpm": 1400, "reference_speed_rpm": 1100, "limiting_speed_rpm": 1400, "weight_g": 11000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NNCF 4938 CV resolves to a 190×260×69 mm double-row full-complement cylindrical roller bearing (dimension series 49 (compact heavy section)); a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. Reading the NNCF prefix: a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. This makes the execution one-direction locating: the retained outer ring guides the shaft axially in one direction. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. The radial section height is 35.0 mm and the catalogue mass 11000 g; at 605 kN dynamic rating this is roughly 3.18 kN of C per millimetre of bore before application factors. Fit practice for NNCF4938-CV: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 69 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 260 mm raceway.", "The 605/1290 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF4938-CV?", "a": "SKF NNCF 4938 CV is a double-row full-complement cylindrical roller bearing with 190 mm bore, 260 mm OD and 69 mm width per ISO 15. SKF lists C 605 kN, C0 1290 kN, Pu 132 kN, reference speed 1,100 r/min and limiting speed 1,400 r/min, mass about 11000 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF4938-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF4938-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4938-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 190×260×69 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4938-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 190×260×69 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF4938-CV", "SKF NNCF 4938 CV" ], "locale_variants": {} }, { "sku": "NNCF4940-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 4940 CV", "series": "NNCF4900-series", "type": "cylindrical_roller", "d_mm": 200, "D_mm": 280, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 704, "static_load_kN": 1500, "fatigue_load_limit_kN": 153, "max_rpm": 1300, "reference_speed_rpm": 1000, "limiting_speed_rpm": 1300, "weight_g": 15500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 200 mm shaft, SKF lists NNCF4940-CV as double-row full-complement cylindrical roller: 280 mm OD, 80 mm wide, Pu 153 kN, the catalogue lists 1,000 r/min thermal reference speed and 1,300 r/min mechanical limiting speed. The NNCF configuration means a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes; functionally the bearing is one-direction locating: the retained outer ring guides the shaft axially in one direction. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Load-per-bore for the 200 mm seat is about 3.52 kN/mm, typical of dimension series 49 (compact heavy section); use C0 1500 kN for static checks such as crane hook blocks standing under load. Mounting: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. A 200 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks", "mining shovel and dragline pivots" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 280 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 80 mm-wide ring and concentrates load.", "The 704/1500 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF4940-CV?", "a": "SKF NNCF 4940 CV is a double-row full-complement cylindrical roller bearing with 200 mm bore, 280 mm OD and 80 mm width per ISO 15. SKF lists C 704 kN, C0 1500 kN, Pu 153 kN, reference speed 1,000 r/min and limiting speed 1,300 r/min, mass about 15500 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF4940-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF4940-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4940-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 200×280×80 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4940-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 200×280×80 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF4940-CV", "SKF NNCF 4940 CV" ], "locale_variants": {} }, { "sku": "NNCF4944-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 4944 CV", "series": "NNCF4900-series", "type": "cylindrical_roller", "d_mm": 220, "D_mm": 300, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 737, "static_load_kN": 1600, "fatigue_load_limit_kN": 160, "max_rpm": 1200, "reference_speed_rpm": 950, "limiting_speed_rpm": 1200, "weight_g": 17000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NNCF4944-CV is the 220 mm bore entry in the NNCF4900 range: a 220×300×80 mm double-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 737 kN / C0 1600 kN. Structurally, the NNCF design has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. In arrangement terms it is one-direction locating: the retained outer ring guides the shaft axially in one direction. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. With C 737 kN and C0 1600 kN, size the bearing on the 220×300 mm ISO 15 envelope and check the 160 kN Pu against the equivalent-load floor; the catalogue lists 950 r/min thermal reference speed and 1,200 r/min mechanical limiting speed. Assembly note: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 80 mm-wide ring and concentrates load.", "The 737/1600 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF4944-CV?", "a": "SKF NNCF 4944 CV is a double-row full-complement cylindrical roller bearing with 220 mm bore, 300 mm OD and 80 mm width per ISO 15. SKF lists C 737 kN, C0 1600 kN, Pu 160 kN, reference speed 950 r/min and limiting speed 1,200 r/min, mass about 17000 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF4944-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF4944-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4944-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 220×300×80 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4944-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 220×300×80 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF4944-CV", "SKF NNCF 4944 CV" ], "locale_variants": {} }, { "sku": "NNCF4948-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 4948 CV", "series": "NNCF4900-series", "type": "cylindrical_roller", "d_mm": 240, "D_mm": 320, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 781, "static_load_kN": 1760, "fatigue_load_limit_kN": 173, "max_rpm": 1100, "reference_speed_rpm": 850, "limiting_speed_rpm": 1100, "weight_g": 18500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NNCF 4948 CV resolves to a 240×320×80 mm double-row full-complement cylindrical roller bearing (dimension series 49 (compact heavy section)); a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. Structurally, the NNCF design has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. In arrangement terms it is one-direction locating: the retained outer ring guides the shaft axially in one direction. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. With C 781 kN and C0 1760 kN, size the bearing on the 240×320 mm ISO 15 envelope and check the 173 kN Pu against the equivalent-load floor; the catalogue lists 850 r/min thermal reference speed and 1,100 r/min mechanical limiting speed. Assembly note: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks", "mining shovel and dragline pivots" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 320 mm raceway.", "The 781/1760 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF4948-CV?", "a": "SKF NNCF 4948 CV is a double-row full-complement cylindrical roller bearing with 240 mm bore, 320 mm OD and 80 mm width per ISO 15. SKF lists C 781 kN, C0 1760 kN, Pu 173 kN, reference speed 850 r/min and limiting speed 1,100 r/min, mass about 18500 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF4948-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF4948-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4948-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 240×320×80 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4948-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 240×320×80 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF4948-CV", "SKF NNCF 4948 CV" ], "locale_variants": {} }, { "sku": "NNCF4952-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 4952 CV", "series": "NNCF4900-series", "type": "cylindrical_roller", "d_mm": 260, "D_mm": 360, "B_mm": 100, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1170, "static_load_kN": 2550, "fatigue_load_limit_kN": 245, "max_rpm": 950, "reference_speed_rpm": 750, "limiting_speed_rpm": 950, "weight_g": 31500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NNCF 4952 CV resolves to a 260×360×100 mm double-row full-complement cylindrical roller bearing (dimension series 49 (compact heavy section)); a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. Reading the NNCF prefix: a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. This makes the execution one-direction locating: the retained outer ring guides the shaft axially in one direction. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 2.18 (2550 against 1170 kN), and the Pu figure 245 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 750 r/min thermal reference speed and 950 r/min mechanical limiting speed. Assembly note: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks", "mining shovel and dragline pivots" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 100 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 1170/2550 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF4952-CV?", "a": "SKF NNCF 4952 CV is a double-row full-complement cylindrical roller bearing with 260 mm bore, 360 mm OD and 100 mm width per ISO 15. SKF lists C 1170 kN, C0 2550 kN, Pu 245 kN, reference speed 750 r/min and limiting speed 950 r/min, mass about 31500 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF4952-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF4952-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4952-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 260×360×100 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4952-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 260×360×100 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF4952-CV", "SKF NNCF 4952 CV" ], "locale_variants": {} }, { "sku": "NNCF4956-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 4956 CV", "series": "NNCF4900-series", "type": "cylindrical_roller", "d_mm": 280, "D_mm": 380, "B_mm": 100, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1210, "static_load_kN": 2700, "fatigue_load_limit_kN": 255, "max_rpm": 900, "reference_speed_rpm": 700, "limiting_speed_rpm": 900, "weight_g": 33500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NNCF 4956 CV denotes a double-row full-complement cylindrical roller bearing on the ISO 15 280×380×100 mm envelope, dimension series 49 (compact heavy section), with catalogue mass 33500 g. The NNCF configuration means a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes; functionally the bearing is one-direction locating: the retained outer ring guides the shaft axially in one direction. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Speed planning for NNCF4956-CV: the catalogue lists 700 r/min thermal reference speed and 900 r/min mechanical limiting speed. The mass entry 33500 g covers the complete catalogue execution. Fit practice for NNCF4956-CV: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 380 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 1210/2700 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF4956-CV?", "a": "SKF NNCF 4956 CV is a double-row full-complement cylindrical roller bearing with 280 mm bore, 380 mm OD and 100 mm width per ISO 15. SKF lists C 1210 kN, C0 2700 kN, Pu 255 kN, reference speed 700 r/min and limiting speed 900 r/min, mass about 33500 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF4956-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF4956-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4956-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 280×380×100 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4956-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 280×380×100 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF4956-CV", "SKF NNCF 4956 CV" ], "locale_variants": {} }, { "sku": "NNCF4960-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 4960 CV", "series": "NNCF4900-series", "type": "cylindrical_roller", "d_mm": 300, "D_mm": 420, "B_mm": 118, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1680, "static_load_kN": 3750, "fatigue_load_limit_kN": 355, "max_rpm": 800, "reference_speed_rpm": 670, "limiting_speed_rpm": 800, "weight_g": 52500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NNCF 4960 CV is a double-row full-complement cylindrical roller bearing sized 300×420×118 mm — a dimension series 49 (compact heavy section), listed in SKF catalogue PUB BU/P1 17000 ch. 6.4. Structurally, the NNCF design has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. In arrangement terms it is one-direction locating: the retained outer ring guides the shaft axially in one direction. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. The radial section height is 60.0 mm and the catalogue mass 52500 g; at 1680 kN dynamic rating this is roughly 5.60 kN of C per millimetre of bore before application factors. Mounting: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. A 300 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 118 mm-wide ring and concentrates load.", "The 1680/3750 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF4960-CV?", "a": "SKF NNCF 4960 CV is a double-row full-complement cylindrical roller bearing with 300 mm bore, 420 mm OD and 118 mm width per ISO 15. SKF lists C 1680 kN, C0 3750 kN, Pu 355 kN, reference speed 670 r/min and limiting speed 800 r/min, mass about 52500 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF4960-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF4960-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4960-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 300×420×118 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4960-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 300×420×118 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF4960-CV", "SKF NNCF 4960 CV" ], "locale_variants": {} }, { "sku": "NNCF4964-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 4964 CV", "series": "NNCF4900-series", "type": "cylindrical_roller", "d_mm": 320, "D_mm": 440, "B_mm": 118, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1760, "static_load_kN": 4050, "fatigue_load_limit_kN": 375, "max_rpm": 750, "reference_speed_rpm": 600, "limiting_speed_rpm": 750, "weight_g": 55500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 320 mm shaft, SKF lists NNCF4964-CV as double-row full-complement cylindrical roller: 440 mm OD, 118 mm wide, Pu 375 kN, the catalogue lists 600 r/min thermal reference speed and 750 r/min mechanical limiting speed. Structurally, the NNCF design has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. In arrangement terms it is one-direction locating: the retained outer ring guides the shaft axially in one direction. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 2.30 (4050 against 1760 kN), and the Pu figure 375 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 600 r/min thermal reference speed and 750 r/min mechanical limiting speed. Assembly note: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 118 mm-wide ring and concentrates load.", "The 1760/4050 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF4964-CV?", "a": "SKF NNCF 4964 CV is a double-row full-complement cylindrical roller bearing with 320 mm bore, 440 mm OD and 118 mm width per ISO 15. SKF lists C 1760 kN, C0 4050 kN, Pu 375 kN, reference speed 600 r/min and limiting speed 750 r/min, mass about 55500 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF4964-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF4964-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4964-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 320×440×118 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4964-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 320×440×118 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF4964-CV", "SKF NNCF 4964 CV" ], "locale_variants": {} }, { "sku": "NNCF4968-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 4968 CV", "series": "NNCF4900-series", "type": "cylindrical_roller", "d_mm": 340, "D_mm": 460, "B_mm": 118, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1790, "static_load_kN": 4250, "fatigue_load_limit_kN": 390, "max_rpm": 700, "reference_speed_rpm": 560, "limiting_speed_rpm": 700, "weight_g": 58500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NNCF4968-CV is the 340 mm bore entry in the NNCF4900 range: a 340×460×118 mm double-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 1790 kN / C0 4250 kN. Reading the NNCF prefix: a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. This makes the execution one-direction locating: the retained outer ring guides the shaft axially in one direction. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Load-per-bore for the 340 mm seat is about 5.26 kN/mm, typical of dimension series 49 (compact heavy section); use C0 4250 kN for static checks such as crane hook blocks standing under load. Assembly note: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 118 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 460 mm raceway.", "The 1790/4250 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF4968-CV?", "a": "SKF NNCF 4968 CV is a double-row full-complement cylindrical roller bearing with 340 mm bore, 460 mm OD and 118 mm width per ISO 15. SKF lists C 1790 kN, C0 4250 kN, Pu 390 kN, reference speed 560 r/min and limiting speed 700 r/min, mass about 58500 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF4968-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF4968-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4968-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 340×460×118 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4968-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 340×460×118 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF4968-CV", "SKF NNCF 4968 CV" ], "locale_variants": {} }, { "sku": "NNCF4972-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 4972 CV", "series": "NNCF4900-series", "type": "cylindrical_roller", "d_mm": 360, "D_mm": 480, "B_mm": 118, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1830, "static_load_kN": 4500, "fatigue_load_limit_kN": 405, "max_rpm": 670, "reference_speed_rpm": 530, "limiting_speed_rpm": 670, "weight_g": 61500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NNCF4972-CV is the 360 mm bore entry in the NNCF4900 range: a 360×480×118 mm double-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 1830 kN / C0 4500 kN. The NNCF configuration means a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes; functionally the bearing is one-direction locating: the retained outer ring guides the shaft axially in one direction. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. With C 1830 kN and C0 4500 kN, size the bearing on the 360×480 mm ISO 15 envelope and check the 405 kN Pu against the equivalent-load floor; the catalogue lists 530 r/min thermal reference speed and 670 r/min mechanical limiting speed. Assembly note: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 480 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 1830/4500 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF4972-CV?", "a": "SKF NNCF 4972 CV is a double-row full-complement cylindrical roller bearing with 360 mm bore, 480 mm OD and 118 mm width per ISO 15. SKF lists C 1830 kN, C0 4500 kN, Pu 405 kN, reference speed 530 r/min and limiting speed 670 r/min, mass about 61500 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF4972-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF4972-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4972-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 360×480×118 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4972-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 360×480×118 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF4972-CV", "SKF NNCF 4972 CV" ], "locale_variants": {} }, { "sku": "NNCF4976-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 4976 CV", "series": "NNCF4900-series", "type": "cylindrical_roller", "d_mm": 380, "D_mm": 520, "B_mm": 140, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 2380, "static_load_kN": 5700, "fatigue_load_limit_kN": 500, "max_rpm": 630, "reference_speed_rpm": 500, "limiting_speed_rpm": 630, "weight_g": 91500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NNCF 4976 CV resolves to a 380×520×140 mm double-row full-complement cylindrical roller bearing (dimension series 49 (compact heavy section)); a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. The NNCF configuration means a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes; functionally the bearing is one-direction locating: the retained outer ring guides the shaft axially in one direction. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. The radial section height is 70.0 mm and the catalogue mass 91500 g; at 2380 kN dynamic rating this is roughly 6.26 kN of C per millimetre of bore before application factors. Fit practice for NNCF4976-CV: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 520 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 2380/5700 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF4976-CV?", "a": "SKF NNCF 4976 CV is a double-row full-complement cylindrical roller bearing with 380 mm bore, 520 mm OD and 140 mm width per ISO 15. SKF lists C 2380 kN, C0 5700 kN, Pu 500 kN, reference speed 500 r/min and limiting speed 630 r/min, mass about 91500 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF4976-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF4976-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4976-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 380×520×140 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4976-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 380×520×140 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF4976-CV", "SKF NNCF 4976 CV" ], "locale_variants": {} }, { "sku": "NNCF4980-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 4980 CV", "series": "NNCF4900-series", "type": "cylindrical_roller", "d_mm": 400, "D_mm": 540, "B_mm": 140, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 2420, "static_load_kN": 6000, "fatigue_load_limit_kN": 520, "max_rpm": 600, "reference_speed_rpm": 480, "limiting_speed_rpm": 600, "weight_g": 95500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NNCF 4980 CV resolves to a 400×540×140 mm double-row full-complement cylindrical roller bearing (dimension series 49 (compact heavy section)); a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. Reading the NNCF prefix: a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. This makes the execution one-direction locating: the retained outer ring guides the shaft axially in one direction. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Speed planning for NNCF4980-CV: the catalogue lists 480 r/min thermal reference speed and 600 r/min mechanical limiting speed. The mass entry 95500 g covers the complete catalogue execution. Fit practice for NNCF4980-CV: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "large offshore winch and hook blocks", "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 140 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 140 mm-wide ring and concentrates load.", "The 2420/6000 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF4980-CV?", "a": "SKF NNCF 4980 CV is a double-row full-complement cylindrical roller bearing with 400 mm bore, 540 mm OD and 140 mm width per ISO 15. SKF lists C 2420 kN, C0 6000 kN, Pu 520 kN, reference speed 480 r/min and limiting speed 600 r/min, mass about 95500 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF4980-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF4980-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4980-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 400×540×140 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCL4980-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 400×540×140 mm and equivalent catalogue ratings; the NNCL execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF4980-CV", "SKF NNCF 4980 CV" ], "locale_variants": {} }, { "sku": "NNCF5004-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 5004 CV", "series": "NNCF5000-series", "type": "cylindrical_roller", "d_mm": 20, "D_mm": 42, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 52.3, "static_load_kN": 57, "fatigue_load_limit_kN": 6.2, "max_rpm": 10000, "reference_speed_rpm": 8500, "limiting_speed_rpm": 10000, "weight_g": 200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NNCF 5004 CV denotes a double-row full-complement cylindrical roller bearing on the ISO 15 20×42×30 mm envelope, dimension series 50 (compact heavy section, wide), with catalogue mass 200 g. Structurally, the NNCF design has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. In arrangement terms it is one-direction locating: the retained outer ring guides the shaft axially in one direction. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. With C 52.3 kN and C0 57 kN, size the bearing on the 20×42 mm ISO 15 envelope and check the 6.2 kN Pu against the equivalent-load floor; the catalogue lists 8,500 r/min thermal reference speed and 10,000 r/min mechanical limiting speed. Fit practice for NNCF5004-CV: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "crane sheave and hook-block hubs", "small sheave and rope-pulley supports" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 52.3/57 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF5004-CV?", "a": "SKF NNCF 5004 CV is a double-row full-complement cylindrical roller bearing with 20 mm bore, 42 mm OD and 30 mm width per ISO 15. SKF lists C 52.3 kN, C0 57 kN, Pu 6.2 kN, reference speed 8,500 r/min and limiting speed 10,000 r/min, mass about 200 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF5004-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF5004-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNF5004-ADB-2LSV", "equiv_brand": "SKF", "level": "partial", "note": "Sealed, grease-packed counterpart (SKF NNF 5004 ADB-2LSV) on the same ISO 15 20×42×30 mm envelope; contact seals both sides reduce the limiting speed and catalogue ratings differ by execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF5004-CV", "SKF NNCF 5004 CV" ], "locale_variants": {} }, { "sku": "NNCF5005-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 5005 CV", "series": "NNCF5000-series", "type": "cylindrical_roller", "d_mm": 25, "D_mm": 47, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 59.4, "static_load_kN": 71, "fatigue_load_limit_kN": 7.65, "max_rpm": 9000, "reference_speed_rpm": 7000, "limiting_speed_rpm": 9000, "weight_g": 230, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NNCF 5005 CV resolves to a 25×47×30 mm double-row full-complement cylindrical roller bearing (dimension series 50 (compact heavy section, wide)); a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. Structurally, the NNCF design has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. In arrangement terms it is one-direction locating: the retained outer ring guides the shaft axially in one direction. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Load-per-bore for the 25 mm seat is about 2.38 kN/mm, typical of dimension series 50 (compact heavy section, wide); use C0 71 kN for static checks such as crane hook blocks standing under load. Assembly note: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "small sheave and rope-pulley supports", "crane sheave and hook-block hubs" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 47 mm raceway.", "The 59.4/71 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF5005-CV?", "a": "SKF NNCF 5005 CV is a double-row full-complement cylindrical roller bearing with 25 mm bore, 47 mm OD and 30 mm width per ISO 15. SKF lists C 59.4 kN, C0 71 kN, Pu 7.65 kN, reference speed 7,000 r/min and limiting speed 9,000 r/min, mass about 230 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF5005-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF5005-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNF5005-ADB-2LSV", "equiv_brand": "SKF", "level": "partial", "note": "Sealed, grease-packed counterpart (SKF NNF 5005 ADB-2LSV) on the same ISO 15 25×47×30 mm envelope; contact seals both sides reduce the limiting speed and catalogue ratings differ by execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF5005-CV", "SKF NNCF 5005 CV" ], "locale_variants": {} }, { "sku": "NNCF5006-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 5006 CV", "series": "NNCF5000-series", "type": "cylindrical_roller", "d_mm": 30, "D_mm": 55, "B_mm": 34, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 73.7, "static_load_kN": 88, "fatigue_load_limit_kN": 10, "max_rpm": 7500, "reference_speed_rpm": 6000, "limiting_speed_rpm": 7500, "weight_g": 350, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NNCF5006-CV is the 30 mm bore entry in the NNCF5000 range: a 30×55×34 mm double-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 73.7 kN / C0 88 kN. Structurally, the NNCF design has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. In arrangement terms it is one-direction locating: the retained outer ring guides the shaft axially in one direction. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. With C 73.7 kN and C0 88 kN, size the bearing on the 30×55 mm ISO 15 envelope and check the 10 kN Pu against the equivalent-load floor; the catalogue lists 6,000 r/min thermal reference speed and 7,500 r/min mechanical limiting speed. Fit practice for NNCF5006-CV: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "hydraulic press eccentric shafts", "crane rope-sheave assemblies", "heavy gearbox low-speed shafts", "construction machinery pivot points" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 55 mm raceway.", "The 73.7/88 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF5006-CV?", "a": "SKF NNCF 5006 CV is a double-row full-complement cylindrical roller bearing with 30 mm bore, 55 mm OD and 34 mm width per ISO 15. SKF lists C 73.7 kN, C0 88 kN, Pu 10 kN, reference speed 6,000 r/min and limiting speed 7,500 r/min, mass about 350 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF5006-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF5006-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNF5006-ADB-2LSV", "equiv_brand": "SKF", "level": "partial", "note": "Sealed, grease-packed counterpart (SKF NNF 5006 ADB-2LSV) on the same ISO 15 30×55×34 mm envelope; contact seals both sides reduce the limiting speed and catalogue ratings differ by execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF5006-CV", "SKF NNCF 5006 CV" ], "locale_variants": {} }, { "sku": "NNCF5007-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 5007 CV", "series": "NNCF5000-series", "type": "cylindrical_roller", "d_mm": 35, "D_mm": 62, "B_mm": 36, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 89.7, "static_load_kN": 112, "fatigue_load_limit_kN": 12.9, "max_rpm": 6700, "reference_speed_rpm": 5300, "limiting_speed_rpm": 6700, "weight_g": 460, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 35 mm shaft, SKF lists NNCF5007-CV as double-row full-complement cylindrical roller: 62 mm OD, 36 mm wide, Pu 12.9 kN, the catalogue lists 5,300 r/min thermal reference speed and 6,700 r/min mechanical limiting speed. Structurally, the NNCF design has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. In arrangement terms it is one-direction locating: the retained outer ring guides the shaft axially in one direction. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 35 mm seat is about 2.56 kN/mm, typical of dimension series 50 (compact heavy section, wide); use C0 112 kN for static checks such as crane hook blocks standing under load. Assembly note: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "crane rope-sheave assemblies", "heavy gearbox low-speed shafts", "construction machinery pivot points", "hydraulic press eccentric shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 36 mm-wide ring and concentrates load.", "The 89.7/112 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF5007-CV?", "a": "SKF NNCF 5007 CV is a double-row full-complement cylindrical roller bearing with 35 mm bore, 62 mm OD and 36 mm width per ISO 15. SKF lists C 89.7 kN, C0 112 kN, Pu 12.9 kN, reference speed 5,300 r/min and limiting speed 6,700 r/min, mass about 460 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF5007-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF5007-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNF5007-ADB-2LSV", "equiv_brand": "SKF", "level": "partial", "note": "Sealed, grease-packed counterpart (SKF NNF 5007 ADB-2LSV) on the same ISO 15 35×62×36 mm envelope; contact seals both sides reduce the limiting speed and catalogue ratings differ by execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF5007-CV", "SKF NNCF 5007 CV" ], "locale_variants": {} }, { "sku": "NNCF5008-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 5008 CV", "series": "NNCF5000-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 68, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 106, "static_load_kN": 140, "fatigue_load_limit_kN": 17, "max_rpm": 6000, "reference_speed_rpm": 4800, "limiting_speed_rpm": 6000, "weight_g": 560, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NNCF 5008 CV is a double-row full-complement cylindrical roller bearing sized 40×68×38 mm — a dimension series 50 (compact heavy section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.4. Structurally, the NNCF design has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. In arrangement terms it is one-direction locating: the retained outer ring guides the shaft axially in one direction. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. With C 106 kN and C0 140 kN, size the bearing on the 40×68 mm ISO 15 envelope and check the 17 kN Pu against the equivalent-load floor; the catalogue lists 4,800 r/min thermal reference speed and 6,000 r/min mechanical limiting speed. Fit practice for NNCF5008-CV: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "construction machinery pivot points", "hydraulic press eccentric shafts", "crane rope-sheave assemblies", "heavy gearbox low-speed shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 38 mm-wide ring and concentrates load.", "The 106/140 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF5008-CV?", "a": "SKF NNCF 5008 CV is a double-row full-complement cylindrical roller bearing with 40 mm bore, 68 mm OD and 38 mm width per ISO 15. SKF lists C 106 kN, C0 140 kN, Pu 17 kN, reference speed 4,800 r/min and limiting speed 6,000 r/min, mass about 560 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF5008-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF5008-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNF5008-ADB-2LSV", "equiv_brand": "SKF", "level": "partial", "note": "Sealed, grease-packed counterpart (SKF NNF 5008 ADB-2LSV) on the same ISO 15 40×68×38 mm envelope; contact seals both sides reduce the limiting speed and catalogue ratings differ by execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF5008-CV", "SKF NNCF 5008 CV" ], "locale_variants": {} }, { "sku": "NNCF5009-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 5009 CV", "series": "NNCF5000-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 75, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 112, "static_load_kN": 156, "fatigue_load_limit_kN": 18.3, "max_rpm": 5300, "reference_speed_rpm": 4300, "limiting_speed_rpm": 5300, "weight_g": 710, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NNCF 5009 CV denotes a double-row full-complement cylindrical roller bearing on the ISO 15 45×75×40 mm envelope, dimension series 50 (compact heavy section, wide), with catalogue mass 710 g. Structurally, the NNCF design has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. In arrangement terms it is one-direction locating: the retained outer ring guides the shaft axially in one direction. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 45 mm seat is about 2.49 kN/mm, typical of dimension series 50 (compact heavy section, wide); use C0 156 kN for static checks such as crane hook blocks standing under load. Assembly note: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "hydraulic press eccentric shafts", "crane rope-sheave assemblies", "heavy gearbox low-speed shafts", "construction machinery pivot points" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 112/156 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF5009-CV?", "a": "SKF NNCF 5009 CV is a double-row full-complement cylindrical roller bearing with 45 mm bore, 75 mm OD and 40 mm width per ISO 15. SKF lists C 112 kN, C0 156 kN, Pu 18.3 kN, reference speed 4,300 r/min and limiting speed 5,300 r/min, mass about 710 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF5009-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF5009-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNF5009-ADB-2LSV", "equiv_brand": "SKF", "level": "full", "note": "Sealed, grease-packed counterpart (SKF NNF 5009 ADB-2LSV) on the same ISO 15 45×75×40 mm envelope; contact seals both sides reduce the limiting speed and catalogue ratings differ by execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF5009-CV", "SKF NNCF 5009 CV" ], "locale_variants": {} }, { "sku": "NNCF5010-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 5010 CV", "series": "NNCF5000-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 80, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 142, "static_load_kN": 196, "fatigue_load_limit_kN": 23.6, "max_rpm": 5000, "reference_speed_rpm": 4000, "limiting_speed_rpm": 5000, "weight_g": 760, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NNCF5010-CV is the 50 mm bore entry in the NNCF5000 range: a 50×80×40 mm double-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 142 kN / C0 196 kN. Reading the NNCF prefix: a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. This makes the execution one-direction locating: the retained outer ring guides the shaft axially in one direction. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 1.38 (196 against 142 kN), and the Pu figure 23.6 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 4,000 r/min thermal reference speed and 5,000 r/min mechanical limiting speed. Fit practice for NNCF5010-CV: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "hydraulic press eccentric shafts", "crane rope-sheave assemblies", "heavy gearbox low-speed shafts", "construction machinery pivot points" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 40 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 142/196 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF5010-CV?", "a": "SKF NNCF 5010 CV is a double-row full-complement cylindrical roller bearing with 50 mm bore, 80 mm OD and 40 mm width per ISO 15. SKF lists C 142 kN, C0 196 kN, Pu 23.6 kN, reference speed 4,000 r/min and limiting speed 5,000 r/min, mass about 760 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF5010-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF5010-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNF5010-ADB-2LSV", "equiv_brand": "SKF", "level": "partial", "note": "Sealed, grease-packed counterpart (SKF NNF 5010 ADB-2LSV) on the same ISO 15 50×80×40 mm envelope; contact seals both sides reduce the limiting speed and catalogue ratings differ by execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF5010-CV", "SKF NNCF 5010 CV" ], "locale_variants": {} }, { "sku": "NNCF5011-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 5011 CV", "series": "NNCF5000-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 90, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 190, "static_load_kN": 280, "fatigue_load_limit_kN": 34.5, "max_rpm": 4300, "reference_speed_rpm": 3400, "limiting_speed_rpm": 4300, "weight_g": 1150, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 55 mm shaft, SKF lists NNCF5011-CV as double-row full-complement cylindrical roller: 90 mm OD, 46 mm wide, Pu 34.5 kN, the catalogue lists 3,400 r/min thermal reference speed and 4,300 r/min mechanical limiting speed. Reading the NNCF prefix: a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. This makes the execution one-direction locating: the retained outer ring guides the shaft axially in one direction. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. With C 190 kN and C0 280 kN, size the bearing on the 55×90 mm ISO 15 envelope and check the 34.5 kN Pu against the equivalent-load floor; the catalogue lists 3,400 r/min thermal reference speed and 4,300 r/min mechanical limiting speed. Assembly note: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "crane rope-sheave assemblies", "heavy gearbox low-speed shafts", "construction machinery pivot points", "hydraulic press eccentric shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 46 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 90 mm raceway.", "The 190/280 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF5011-CV?", "a": "SKF NNCF 5011 CV is a double-row full-complement cylindrical roller bearing with 55 mm bore, 90 mm OD and 46 mm width per ISO 15. SKF lists C 190 kN, C0 280 kN, Pu 34.5 kN, reference speed 3,400 r/min and limiting speed 4,300 r/min, mass about 1150 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF5011-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF5011-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNF5011-ADB-2LSV", "equiv_brand": "SKF", "level": "partial", "note": "Sealed, grease-packed counterpart (SKF NNF 5011 ADB-2LSV) on the same ISO 15 55×90×46 mm envelope; contact seals both sides reduce the limiting speed and catalogue ratings differ by execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF5011-CV", "SKF NNCF 5011 CV" ], "locale_variants": {} }, { "sku": "NNCF5012-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 5012 CV", "series": "NNCF5000-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 95, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 198, "static_load_kN": 300, "fatigue_load_limit_kN": 36.5, "max_rpm": 4000, "reference_speed_rpm": 3400, "limiting_speed_rpm": 4000, "weight_g": 1250, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NNCF 5012 CV is a double-row full-complement cylindrical roller bearing sized 60×95×46 mm — a dimension series 50 (compact heavy section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.4. Reading the NNCF prefix: a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. This makes the execution one-direction locating: the retained outer ring guides the shaft axially in one direction. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Load-per-bore for the 60 mm seat is about 3.30 kN/mm, typical of dimension series 50 (compact heavy section, wide); use C0 300 kN for static checks such as crane hook blocks standing under load. Mounting: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. A 60 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "large crane and winch drums", "offshore crane sheaves", "heavy material-handling rope pulleys", "rolling-mill and caster drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 46 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 46 mm-wide ring and concentrates load.", "The 198/300 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF5012-CV?", "a": "SKF NNCF 5012 CV is a double-row full-complement cylindrical roller bearing with 60 mm bore, 95 mm OD and 46 mm width per ISO 15. SKF lists C 198 kN, C0 300 kN, Pu 36.5 kN, reference speed 3,400 r/min and limiting speed 4,000 r/min, mass about 1250 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF5012-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF5012-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNF5012-ADB-2LSV", "equiv_brand": "SKF", "level": "partial", "note": "Sealed, grease-packed counterpart (SKF NNF 5012 ADB-2LSV) on the same ISO 15 60×95×46 mm envelope; contact seals both sides reduce the limiting speed and catalogue ratings differ by execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF5012-CV", "SKF NNCF 5012 CV" ], "locale_variants": {} }, { "sku": "NNCF5013-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 5013 CV", "series": "NNCF5000-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 100, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 209, "static_load_kN": 325, "fatigue_load_limit_kN": 40, "max_rpm": 3800, "reference_speed_rpm": 3000, "limiting_speed_rpm": 3800, "weight_g": 1300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NNCF 5013 CV denotes a double-row full-complement cylindrical roller bearing on the ISO 15 65×100×46 mm envelope, dimension series 50 (compact heavy section, wide), with catalogue mass 1300 g. Reading the NNCF prefix: a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. This makes the execution one-direction locating: the retained outer ring guides the shaft axially in one direction. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. With C 209 kN and C0 325 kN, size the bearing on the 65×100 mm ISO 15 envelope and check the 40 kN Pu against the equivalent-load floor; the catalogue lists 3,000 r/min thermal reference speed and 3,800 r/min mechanical limiting speed. Assembly note: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "heavy material-handling rope pulleys", "rolling-mill and caster drives", "large crane and winch drums", "offshore crane sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 46 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 46 mm-wide ring and concentrates load.", "The 209/325 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF5013-CV?", "a": "SKF NNCF 5013 CV is a double-row full-complement cylindrical roller bearing with 65 mm bore, 100 mm OD and 46 mm width per ISO 15. SKF lists C 209 kN, C0 325 kN, Pu 40 kN, reference speed 3,000 r/min and limiting speed 3,800 r/min, mass about 1300 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF5013-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF5013-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNF5013-ADB-2LSV", "equiv_brand": "SKF", "level": "partial", "note": "Sealed, grease-packed counterpart (SKF NNF 5013 ADB-2LSV) on the same ISO 15 65×100×46 mm envelope; contact seals both sides reduce the limiting speed and catalogue ratings differ by execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF5013-CV", "SKF NNCF 5013 CV" ], "locale_variants": {} }, { "sku": "NNCF5014-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 5014 CV", "series": "NNCF5000-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 110, "B_mm": 54, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 238, "static_load_kN": 345, "fatigue_load_limit_kN": 45, "max_rpm": 3600, "reference_speed_rpm": 2800, "limiting_speed_rpm": 3600, "weight_g": 1850, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NNCF 5014 CV resolves to a 70×110×54 mm double-row full-complement cylindrical roller bearing (dimension series 50 (compact heavy section, wide)); a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. Reading the NNCF prefix: a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. This makes the execution one-direction locating: the retained outer ring guides the shaft axially in one direction. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 70 mm seat is about 3.40 kN/mm, typical of dimension series 50 (compact heavy section, wide); use C0 345 kN for static checks such as crane hook blocks standing under load. Mounting: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. A 70 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "rolling-mill and caster drives", "large crane and winch drums", "offshore crane sheaves", "heavy material-handling rope pulleys" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 54 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 238/345 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF5014-CV?", "a": "SKF NNCF 5014 CV is a double-row full-complement cylindrical roller bearing with 70 mm bore, 110 mm OD and 54 mm width per ISO 15. SKF lists C 238 kN, C0 345 kN, Pu 45 kN, reference speed 2,800 r/min and limiting speed 3,600 r/min, mass about 1850 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF5014-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF5014-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNF5014-ADB-2LSV", "equiv_brand": "SKF", "level": "partial", "note": "Sealed, grease-packed counterpart (SKF NNF 5014 ADB-2LSV) on the same ISO 15 70×110×54 mm envelope; contact seals both sides reduce the limiting speed and catalogue ratings differ by execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF5014-CV", "SKF NNCF 5014 CV" ], "locale_variants": {} }, { "sku": "NNCF5015-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 5015 CV", "series": "NNCF5000-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 115, "B_mm": 54, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 251, "static_load_kN": 380, "fatigue_load_limit_kN": 49, "max_rpm": 3200, "reference_speed_rpm": 2600, "limiting_speed_rpm": 3200, "weight_g": 1950, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NNCF5015-CV is the 75 mm bore entry in the NNCF5000 range: a 75×115×54 mm double-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 251 kN / C0 380 kN. Reading the NNCF prefix: a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. This makes the execution one-direction locating: the retained outer ring guides the shaft axially in one direction. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. The radial section height is 20.0 mm and the catalogue mass 1950 g; at 251 kN dynamic rating this is roughly 3.35 kN of C per millimetre of bore before application factors. Fit practice for NNCF5015-CV: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "large crane and winch drums", "offshore crane sheaves", "heavy material-handling rope pulleys", "rolling-mill and caster drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 54 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 115 mm raceway.", "The 251/380 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF5015-CV?", "a": "SKF NNCF 5015 CV is a double-row full-complement cylindrical roller bearing with 75 mm bore, 115 mm OD and 54 mm width per ISO 15. SKF lists C 251 kN, C0 380 kN, Pu 49 kN, reference speed 2,600 r/min and limiting speed 3,200 r/min, mass about 1950 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF5015-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF5015-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNF5015-ADB-2LSV", "equiv_brand": "SKF", "level": "partial", "note": "Sealed, grease-packed counterpart (SKF NNF 5015 ADB-2LSV) on the same ISO 15 75×115×54 mm envelope; contact seals both sides reduce the limiting speed and catalogue ratings differ by execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF5015-CV", "SKF NNCF 5015 CV" ], "locale_variants": {} }, { "sku": "NNCF5016-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 5016 CV", "series": "NNCF5000-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 125, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 308, "static_load_kN": 455, "fatigue_load_limit_kN": 58.5, "max_rpm": 3000, "reference_speed_rpm": 2400, "limiting_speed_rpm": 3000, "weight_g": 2600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 80 mm shaft, SKF lists NNCF5016-CV as double-row full-complement cylindrical roller: 125 mm OD, 60 mm wide, Pu 58.5 kN, the catalogue lists 2,400 r/min thermal reference speed and 3,000 r/min mechanical limiting speed. The NNCF configuration means a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes; functionally the bearing is one-direction locating: the retained outer ring guides the shaft axially in one direction. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Speed planning for NNCF5016-CV: the catalogue lists 2,400 r/min thermal reference speed and 3,000 r/min mechanical limiting speed. The mass entry 2600 g covers the complete catalogue execution. Mounting: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. A 80 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "offshore crane sheaves", "heavy material-handling rope pulleys", "rolling-mill and caster drives", "large crane and winch drums" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 125 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 125 mm raceway.", "The 308/455 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF5016-CV?", "a": "SKF NNCF 5016 CV is a double-row full-complement cylindrical roller bearing with 80 mm bore, 125 mm OD and 60 mm width per ISO 15. SKF lists C 308 kN, C0 455 kN, Pu 58.5 kN, reference speed 2,400 r/min and limiting speed 3,000 r/min, mass about 2600 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF5016-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF5016-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNF5016-B-2LS", "equiv_brand": "SKF", "level": "partial", "note": "Sealed, grease-packed counterpart (SKF NNF 5016 B-2LS) on the same ISO 15 80×125×60 mm envelope; contact seals both sides reduce the limiting speed and catalogue ratings differ by execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF5016-CV", "SKF NNCF 5016 CV" ], "locale_variants": {} }, { "sku": "NNCF5017-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 5017 CV", "series": "NNCF5000-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 130, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 314, "static_load_kN": 475, "fatigue_load_limit_kN": 60, "max_rpm": 3000, "reference_speed_rpm": 2400, "limiting_speed_rpm": 3000, "weight_g": 2700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NNCF 5017 CV is a double-row full-complement cylindrical roller bearing sized 85×130×60 mm — a dimension series 50 (compact heavy section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.4. The NNCF configuration means a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes; functionally the bearing is one-direction locating: the retained outer ring guides the shaft axially in one direction. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 1.51 (475 against 314 kN), and the Pu figure 60 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 2,400 r/min thermal reference speed and 3,000 r/min mechanical limiting speed. Fit practice for NNCF5017-CV: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "heavy material-handling rope pulleys", "rolling-mill and caster drives", "large crane and winch drums", "offshore crane sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 130 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 60 mm-wide ring and concentrates load.", "The 314/475 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF5017-CV?", "a": "SKF NNCF 5017 CV is a double-row full-complement cylindrical roller bearing with 85 mm bore, 130 mm OD and 60 mm width per ISO 15. SKF lists C 314 kN, C0 475 kN, Pu 60 kN, reference speed 2,400 r/min and limiting speed 3,000 r/min, mass about 2700 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF5017-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF5017-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNF5017-B-2LS", "equiv_brand": "SKF", "level": "partial", "note": "Sealed, grease-packed counterpart (SKF NNF 5017 B-2LS) on the same ISO 15 85×130×60 mm envelope; contact seals both sides reduce the limiting speed and catalogue ratings differ by execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF5017-CV", "SKF NNCF 5017 CV" ], "locale_variants": {} }, { "sku": "NNCF5018-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 5018 CV", "series": "NNCF5000-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 140, "B_mm": 67, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 369, "static_load_kN": 560, "fatigue_load_limit_kN": 69.5, "max_rpm": 2800, "reference_speed_rpm": 2200, "limiting_speed_rpm": 2800, "weight_g": 3600, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NNCF 5018 CV denotes a double-row full-complement cylindrical roller bearing on the ISO 15 90×140×67 mm envelope, dimension series 50 (compact heavy section, wide), with catalogue mass 3600 g. The NNCF configuration means a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes; functionally the bearing is one-direction locating: the retained outer ring guides the shaft axially in one direction. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. With C 369 kN and C0 560 kN, size the bearing on the 90×140 mm ISO 15 envelope and check the 69.5 kN Pu against the equivalent-load floor; the catalogue lists 2,200 r/min thermal reference speed and 2,800 r/min mechanical limiting speed. Assembly note: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "rolling-mill and caster drives", "large crane and winch drums", "offshore crane sheaves", "heavy material-handling rope pulleys" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 140 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 369/560 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF5018-CV?", "a": "SKF NNCF 5018 CV is a double-row full-complement cylindrical roller bearing with 90 mm bore, 140 mm OD and 67 mm width per ISO 15. SKF lists C 369 kN, C0 560 kN, Pu 69.5 kN, reference speed 2,200 r/min and limiting speed 2,800 r/min, mass about 3600 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF5018-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF5018-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNF5018-B-2LS", "equiv_brand": "SKF", "level": "partial", "note": "Sealed, grease-packed counterpart (SKF NNF 5018 B-2LS) on the same ISO 15 90×140×67 mm envelope; contact seals both sides reduce the limiting speed and catalogue ratings differ by execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF5018-CV", "SKF NNCF 5018 CV" ], "locale_variants": {} }, { "sku": "NNCF5020-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 5020 CV", "series": "NNCF5000-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 150, "B_mm": 67, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 391, "static_load_kN": 620, "fatigue_load_limit_kN": 75, "max_rpm": 2600, "reference_speed_rpm": 2000, "limiting_speed_rpm": 2600, "weight_g": 3950, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 100 mm shaft, SKF lists NNCF5020-CV as double-row full-complement cylindrical roller: 150 mm OD, 67 mm wide, Pu 75 kN, the catalogue lists 2,000 r/min thermal reference speed and 2,600 r/min mechanical limiting speed. Structurally, the NNCF design has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. In arrangement terms it is one-direction locating: the retained outer ring guides the shaft axially in one direction. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 1.59 (620 against 391 kN), and the Pu figure 75 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 2,000 r/min thermal reference speed and 2,600 r/min mechanical limiting speed. Assembly note: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "large crane and winch drums", "offshore crane sheaves", "heavy material-handling rope pulleys", "rolling-mill and caster drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 150 mm raceway.", "The 391/620 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF5020-CV?", "a": "SKF NNCF 5020 CV is a double-row full-complement cylindrical roller bearing with 100 mm bore, 150 mm OD and 67 mm width per ISO 15. SKF lists C 391 kN, C0 620 kN, Pu 75 kN, reference speed 2,000 r/min and limiting speed 2,600 r/min, mass about 3950 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF5020-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF5020-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNF5020-B-2LS", "equiv_brand": "SKF", "level": "partial", "note": "Sealed, grease-packed counterpart (SKF NNF 5020 B-2LS) on the same ISO 15 100×150×67 mm envelope; contact seals both sides reduce the limiting speed and catalogue ratings differ by execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF5020-CV", "SKF NNCF 5020 CV" ], "locale_variants": {} }, { "sku": "NNCF5022-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 5022 CV", "series": "NNCF5000-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 170, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 512, "static_load_kN": 800, "fatigue_load_limit_kN": 95, "max_rpm": 2200, "reference_speed_rpm": 1800, "limiting_speed_rpm": 2200, "weight_g": 6300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NNCF 5022 CV denotes a double-row full-complement cylindrical roller bearing on the ISO 15 110×170×80 mm envelope, dimension series 50 (compact heavy section, wide), with catalogue mass 6300 g. Structurally, the NNCF design has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. In arrangement terms it is one-direction locating: the retained outer ring guides the shaft axially in one direction. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 1.56 (800 against 512 kN), and the Pu figure 95 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 1,800 r/min thermal reference speed and 2,200 r/min mechanical limiting speed. Assembly note: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "rolling-mill and caster drives", "large crane and winch drums", "offshore crane sheaves", "heavy material-handling rope pulleys" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 80 mm-wide ring and concentrates load.", "The 512/800 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF5022-CV?", "a": "SKF NNCF 5022 CV is a double-row full-complement cylindrical roller bearing with 110 mm bore, 170 mm OD and 80 mm width per ISO 15. SKF lists C 512 kN, C0 800 kN, Pu 95 kN, reference speed 1,800 r/min and limiting speed 2,200 r/min, mass about 6300 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF5022-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF5022-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNF5022-B-2LS", "equiv_brand": "SKF", "level": "partial", "note": "Sealed, grease-packed counterpart (SKF NNF 5022 B-2LS) on the same ISO 15 110×170×80 mm envelope; contact seals both sides reduce the limiting speed and catalogue ratings differ by execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF5022-CV", "SKF NNCF 5022 CV" ], "locale_variants": {} }, { "sku": "NNCF5024-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 5024 CV", "series": "NNCF5000-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 180, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 539, "static_load_kN": 880, "fatigue_load_limit_kN": 104, "max_rpm": 2000, "reference_speed_rpm": 1700, "limiting_speed_rpm": 2000, "weight_g": 6750, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NNCF5024-CV is the 120 mm bore entry in the NNCF5000 range: a 120×180×80 mm double-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 539 kN / C0 880 kN. Structurally, the NNCF design has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. In arrangement terms it is one-direction locating: the retained outer ring guides the shaft axially in one direction. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 1.63 (880 against 539 kN), and the Pu figure 104 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 1,700 r/min thermal reference speed and 2,000 r/min mechanical limiting speed. Assembly note: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "large offshore winch and hook blocks", "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 539/880 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF5024-CV?", "a": "SKF NNCF 5024 CV is a double-row full-complement cylindrical roller bearing with 120 mm bore, 180 mm OD and 80 mm width per ISO 15. SKF lists C 539 kN, C0 880 kN, Pu 104 kN, reference speed 1,700 r/min and limiting speed 2,000 r/min, mass about 6750 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF5024-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF5024-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNF5024-B-2LS", "equiv_brand": "SKF", "level": "partial", "note": "Sealed, grease-packed counterpart (SKF NNF 5024 B-2LS) on the same ISO 15 120×180×80 mm envelope; contact seals both sides reduce the limiting speed and catalogue ratings differ by execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF5024-CV", "SKF NNCF 5024 CV" ], "locale_variants": {} }, { "sku": "NNCF5026-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 5026 CV", "series": "NNCF5000-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 200, "B_mm": 95, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 765, "static_load_kN": 1250, "fatigue_load_limit_kN": 143, "max_rpm": 1900, "reference_speed_rpm": 1500, "limiting_speed_rpm": 1900, "weight_g": 10000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NNCF 5026 CV is a double-row full-complement cylindrical roller bearing sized 130×200×95 mm — a dimension series 50 (compact heavy section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.4. Structurally, the NNCF design has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. In arrangement terms it is one-direction locating: the retained outer ring guides the shaft axially in one direction. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 1.63 (1250 against 765 kN), and the Pu figure 143 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 1,500 r/min thermal reference speed and 1,900 r/min mechanical limiting speed. Assembly note: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks", "mining shovel and dragline pivots" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 200 mm raceway.", "The 765/1250 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF5026-CV?", "a": "SKF NNCF 5026 CV is a double-row full-complement cylindrical roller bearing with 130 mm bore, 200 mm OD and 95 mm width per ISO 15. SKF lists C 765 kN, C0 1250 kN, Pu 143 kN, reference speed 1,500 r/min and limiting speed 1,900 r/min, mass about 10000 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF5026-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF5026-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNF5026-B-2LS", "equiv_brand": "SKF", "level": "partial", "note": "Sealed, grease-packed counterpart (SKF NNF 5026 B-2LS) on the same ISO 15 130×200×95 mm envelope; contact seals both sides reduce the limiting speed and catalogue ratings differ by execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF5026-CV", "SKF NNCF 5026 CV" ], "locale_variants": {} }, { "sku": "NNCF5028-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 5028 CV", "series": "NNCF5000-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 210, "B_mm": 95, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 809, "static_load_kN": 1370, "fatigue_load_limit_kN": 153, "max_rpm": 1800, "reference_speed_rpm": 1400, "limiting_speed_rpm": 1800, "weight_g": 11000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NNCF 5028 CV resolves to a 140×210×95 mm double-row full-complement cylindrical roller bearing (dimension series 50 (compact heavy section, wide)); a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. Structurally, the NNCF design has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. In arrangement terms it is one-direction locating: the retained outer ring guides the shaft axially in one direction. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Load-per-bore for the 140 mm seat is about 5.78 kN/mm, typical of dimension series 50 (compact heavy section, wide); use C0 1370 kN for static checks such as crane hook blocks standing under load. Fit practice for NNCF5028-CV: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "large offshore winch and hook blocks", "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 809/1370 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF5028-CV?", "a": "SKF NNCF 5028 CV is a double-row full-complement cylindrical roller bearing with 140 mm bore, 210 mm OD and 95 mm width per ISO 15. SKF lists C 809 kN, C0 1370 kN, Pu 153 kN, reference speed 1,400 r/min and limiting speed 1,800 r/min, mass about 11000 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF5028-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF5028-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNF5028-B-2LS", "equiv_brand": "SKF", "level": "partial", "note": "Sealed, grease-packed counterpart (SKF NNF 5028 B-2LS) on the same ISO 15 140×210×95 mm envelope; contact seals both sides reduce the limiting speed and catalogue ratings differ by execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF5028-CV", "SKF NNCF 5028 CV" ], "locale_variants": {} }, { "sku": "NNCF5030-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 5030 CV", "series": "NNCF5000-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 225, "B_mm": 100, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 842, "static_load_kN": 1430, "fatigue_load_limit_kN": 160, "max_rpm": 1700, "reference_speed_rpm": 1300, "limiting_speed_rpm": 1700, "weight_g": 13500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 150 mm shaft, SKF lists NNCF5030-CV as double-row full-complement cylindrical roller: 225 mm OD, 100 mm wide, Pu 160 kN, the catalogue lists 1,300 r/min thermal reference speed and 1,700 r/min mechanical limiting speed. The NNCF configuration means a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes; functionally the bearing is one-direction locating: the retained outer ring guides the shaft axially in one direction. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The radial section height is 37.5 mm and the catalogue mass 13500 g; at 842 kN dynamic rating this is roughly 5.61 kN of C per millimetre of bore before application factors. Mounting: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. A 150 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "large offshore winch and hook blocks", "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 225 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 225 mm raceway.", "The 842/1430 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF5030-CV?", "a": "SKF NNCF 5030 CV is a double-row full-complement cylindrical roller bearing with 150 mm bore, 225 mm OD and 100 mm width per ISO 15. SKF lists C 842 kN, C0 1430 kN, Pu 160 kN, reference speed 1,300 r/min and limiting speed 1,700 r/min, mass about 13500 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF5030-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF5030-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNF5030-B-2LS", "equiv_brand": "SKF", "level": "partial", "note": "Sealed, grease-packed counterpart (SKF NNF 5030 B-2LS) on the same ISO 15 150×225×100 mm envelope; contact seals both sides reduce the limiting speed and catalogue ratings differ by execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF5030-CV", "SKF NNCF 5030 CV" ], "locale_variants": {} }, { "sku": "NNCF5032-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 5032 CV", "series": "NNCF5000-series", "type": "cylindrical_roller", "d_mm": 160, "D_mm": 240, "B_mm": 109, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 952, "static_load_kN": 1600, "fatigue_load_limit_kN": 180, "max_rpm": 1500, "reference_speed_rpm": 1200, "limiting_speed_rpm": 1500, "weight_g": 16000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NNCF 5032 CV denotes a double-row full-complement cylindrical roller bearing on the ISO 15 160×240×109 mm envelope, dimension series 50 (compact heavy section, wide), with catalogue mass 16000 g. The NNCF configuration means a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes; functionally the bearing is one-direction locating: the retained outer ring guides the shaft axially in one direction. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. The radial section height is 40.0 mm and the catalogue mass 16000 g; at 952 kN dynamic rating this is roughly 5.95 kN of C per millimetre of bore before application factors. Mounting: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. A 160 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks", "mining shovel and dragline pivots" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 240 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 109 mm-wide ring and concentrates load.", "The 952/1600 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF5032-CV?", "a": "SKF NNCF 5032 CV is a double-row full-complement cylindrical roller bearing with 160 mm bore, 240 mm OD and 109 mm width per ISO 15. SKF lists C 952 kN, C0 1600 kN, Pu 180 kN, reference speed 1,200 r/min and limiting speed 1,500 r/min, mass about 16000 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF5032-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF5032-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNF5032-B-2LS", "equiv_brand": "SKF", "level": "partial", "note": "Sealed, grease-packed counterpart (SKF NNF 5032 B-2LS) on the same ISO 15 160×240×109 mm envelope; contact seals both sides reduce the limiting speed and catalogue ratings differ by execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF5032-CV", "SKF NNCF 5032 CV" ], "locale_variants": {} }, { "sku": "NNCF5034-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 5034 CV", "series": "NNCF5000-series", "type": "cylindrical_roller", "d_mm": 170, "D_mm": 260, "B_mm": 122, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1230, "static_load_kN": 2120, "fatigue_load_limit_kN": 236, "max_rpm": 1400, "reference_speed_rpm": 1100, "limiting_speed_rpm": 1400, "weight_g": 23000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NNCF5034-CV is the 170 mm bore entry in the NNCF5000 range: a 170×260×122 mm double-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 1230 kN / C0 2120 kN. The NNCF configuration means a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes; functionally the bearing is one-direction locating: the retained outer ring guides the shaft axially in one direction. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. The radial section height is 45.0 mm and the catalogue mass 23000 g; at 1230 kN dynamic rating this is roughly 7.24 kN of C per millimetre of bore before application factors. Mounting: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. A 170 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 260 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 1230/2120 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF5034-CV?", "a": "SKF NNCF 5034 CV is a double-row full-complement cylindrical roller bearing with 170 mm bore, 260 mm OD and 122 mm width per ISO 15. SKF lists C 1230 kN, C0 2120 kN, Pu 236 kN, reference speed 1,100 r/min and limiting speed 1,400 r/min, mass about 23000 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF5034-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF5034-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNF5034-B-2LS", "equiv_brand": "SKF", "level": "partial", "note": "Sealed, grease-packed counterpart (SKF NNF 5034 B-2LS) on the same ISO 15 170×260×122 mm envelope; contact seals both sides reduce the limiting speed and catalogue ratings differ by execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF5034-CV", "SKF NNCF 5034 CV" ], "locale_variants": {} }, { "sku": "NNCF5036-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 5036 CV", "series": "NNCF5000-series", "type": "cylindrical_roller", "d_mm": 180, "D_mm": 280, "B_mm": 136, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1420, "static_load_kN": 2500, "fatigue_load_limit_kN": 270, "max_rpm": 1300, "reference_speed_rpm": 1100, "limiting_speed_rpm": 1300, "weight_g": 30500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NNCF 5036 CV is a double-row full-complement cylindrical roller bearing sized 180×280×136 mm — a dimension series 50 (compact heavy section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.4. The NNCF configuration means a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes; functionally the bearing is one-direction locating: the retained outer ring guides the shaft axially in one direction. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The radial section height is 50.0 mm and the catalogue mass 30500 g; at 1420 kN dynamic rating this is roughly 7.89 kN of C per millimetre of bore before application factors. Mounting: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. A 180 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "large offshore winch and hook blocks", "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 280 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 280 mm raceway.", "The 1420/2500 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF5036-CV?", "a": "SKF NNCF 5036 CV is a double-row full-complement cylindrical roller bearing with 180 mm bore, 280 mm OD and 136 mm width per ISO 15. SKF lists C 1420 kN, C0 2500 kN, Pu 270 kN, reference speed 1,100 r/min and limiting speed 1,300 r/min, mass about 30500 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF5036-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF5036-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNF5036-B-2LS", "equiv_brand": "SKF", "level": "partial", "note": "Sealed, grease-packed counterpart (SKF NNF 5036 B-2LS) on the same ISO 15 180×280×136 mm envelope; contact seals both sides reduce the limiting speed and catalogue ratings differ by execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF5036-CV", "SKF NNCF 5036 CV" ], "locale_variants": {} }, { "sku": "NNCF5038-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 5038 CV", "series": "NNCF5000-series", "type": "cylindrical_roller", "d_mm": 190, "D_mm": 290, "B_mm": 136, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1470, "static_load_kN": 2600, "fatigue_load_limit_kN": 280, "max_rpm": 1300, "reference_speed_rpm": 1000, "limiting_speed_rpm": 1300, "weight_g": 31500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NNCF 5038 CV resolves to a 190×290×136 mm double-row full-complement cylindrical roller bearing (dimension series 50 (compact heavy section, wide)); a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. The NNCF configuration means a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes; functionally the bearing is one-direction locating: the retained outer ring guides the shaft axially in one direction. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 1.77 (2600 against 1470 kN), and the Pu figure 280 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 1,000 r/min thermal reference speed and 1,300 r/min mechanical limiting speed. Assembly note: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 290 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 1470/2600 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF5038-CV?", "a": "SKF NNCF 5038 CV is a double-row full-complement cylindrical roller bearing with 190 mm bore, 290 mm OD and 136 mm width per ISO 15. SKF lists C 1470 kN, C0 2600 kN, Pu 280 kN, reference speed 1,000 r/min and limiting speed 1,300 r/min, mass about 31500 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF5038-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF5038-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNF5038-B-2LS", "equiv_brand": "SKF", "level": "partial", "note": "Sealed, grease-packed counterpart (SKF NNF 5038 B-2LS) on the same ISO 15 190×290×136 mm envelope; contact seals both sides reduce the limiting speed and catalogue ratings differ by execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF5038-CV", "SKF NNCF 5038 CV" ], "locale_variants": {} }, { "sku": "NNCF5040-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 5040 CV", "series": "NNCF5000-series", "type": "cylindrical_roller", "d_mm": 200, "D_mm": 310, "B_mm": 150, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1680, "static_load_kN": 3050, "fatigue_load_limit_kN": 320, "max_rpm": 1200, "reference_speed_rpm": 950, "limiting_speed_rpm": 1200, "weight_g": 41000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NNCF 5040 CV is a double-row full-complement cylindrical roller bearing sized 200×310×150 mm — a dimension series 50 (compact heavy section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.4. Reading the NNCF prefix: a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. This makes the execution one-direction locating: the retained outer ring guides the shaft axially in one direction. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. With C 1680 kN and C0 3050 kN, size the bearing on the 200×310 mm ISO 15 envelope and check the 320 kN Pu against the equivalent-load floor; the catalogue lists 950 r/min thermal reference speed and 1,200 r/min mechanical limiting speed. Assembly note: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 150 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 310 mm raceway.", "The 1680/3050 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF5040-CV?", "a": "SKF NNCF 5040 CV is a double-row full-complement cylindrical roller bearing with 200 mm bore, 310 mm OD and 150 mm width per ISO 15. SKF lists C 1680 kN, C0 3050 kN, Pu 320 kN, reference speed 950 r/min and limiting speed 1,200 r/min, mass about 41000 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF5040-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF5040-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNF5040-B-2LS", "equiv_brand": "SKF", "level": "partial", "note": "Sealed, grease-packed counterpart (SKF NNF 5040 B-2LS) on the same ISO 15 200×310×150 mm envelope; contact seals both sides reduce the limiting speed and catalogue ratings differ by execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF5040-CV", "SKF NNCF 5040 CV" ], "locale_variants": {} }, { "sku": "NNCF5044-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 5044 CV", "series": "NNCF5000-series", "type": "cylindrical_roller", "d_mm": 220, "D_mm": 340, "B_mm": 160, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 2010, "static_load_kN": 3600, "fatigue_load_limit_kN": 375, "max_rpm": 1100, "reference_speed_rpm": 850, "limiting_speed_rpm": 1100, "weight_g": 52500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 220 mm shaft, SKF lists NNCF5044-CV as double-row full-complement cylindrical roller: 340 mm OD, 160 mm wide, Pu 375 kN, the catalogue lists 850 r/min thermal reference speed and 1,100 r/min mechanical limiting speed. Reading the NNCF prefix: a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. This makes the execution one-direction locating: the retained outer ring guides the shaft axially in one direction. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. With C 2010 kN and C0 3600 kN, size the bearing on the 220×340 mm ISO 15 envelope and check the 375 kN Pu against the equivalent-load floor; the catalogue lists 850 r/min thermal reference speed and 1,100 r/min mechanical limiting speed. Assembly note: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks", "mining shovel and dragline pivots" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 160 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 2010/3600 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF5044-CV?", "a": "SKF NNCF 5044 CV is a double-row full-complement cylindrical roller bearing with 220 mm bore, 340 mm OD and 160 mm width per ISO 15. SKF lists C 2010 kN, C0 3600 kN, Pu 375 kN, reference speed 850 r/min and limiting speed 1,100 r/min, mass about 52500 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF5044-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF5044-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNF5044-B-2LS", "equiv_brand": "SKF", "level": "partial", "note": "Sealed, grease-packed counterpart (SKF NNF 5044 B-2LS) on the same ISO 15 220×340×160 mm envelope; contact seals both sides reduce the limiting speed and catalogue ratings differ by execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF5044-CV", "SKF NNCF 5044 CV" ], "locale_variants": {} }, { "sku": "NNCF5048-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 5048 CV", "series": "NNCF5000-series", "type": "cylindrical_roller", "d_mm": 240, "D_mm": 360, "B_mm": 160, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 2120, "static_load_kN": 3900, "fatigue_load_limit_kN": 400, "max_rpm": 1000, "reference_speed_rpm": 800, "limiting_speed_rpm": 1000, "weight_g": 56000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NNCF5048-CV is the 240 mm bore entry in the NNCF5000 range: a 240×360×160 mm double-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 2120 kN / C0 3900 kN. Reading the NNCF prefix: a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. This makes the execution one-direction locating: the retained outer ring guides the shaft axially in one direction. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. The radial section height is 60.0 mm and the catalogue mass 56000 g; at 2120 kN dynamic rating this is roughly 8.83 kN of C per millimetre of bore before application factors. Fit practice for NNCF5048-CV: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks", "mining shovel and dragline pivots" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 160 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 2120/3900 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF5048-CV?", "a": "SKF NNCF 5048 CV is a double-row full-complement cylindrical roller bearing with 240 mm bore, 360 mm OD and 160 mm width per ISO 15. SKF lists C 2120 kN, C0 3900 kN, Pu 400 kN, reference speed 800 r/min and limiting speed 1,000 r/min, mass about 56000 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF5048-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF5048-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNF5048-B-2LS", "equiv_brand": "SKF", "level": "partial", "note": "Sealed, grease-packed counterpart (SKF NNF 5048 B-2LS) on the same ISO 15 240×360×160 mm envelope; contact seals both sides reduce the limiting speed and catalogue ratings differ by execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF5048-CV", "SKF NNCF 5048 CV" ], "locale_variants": {} }, { "sku": "NNCF5052-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 5052 CV", "series": "NNCF5000-series", "type": "cylindrical_roller", "d_mm": 260, "D_mm": 400, "B_mm": 190, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 2860, "static_load_kN": 5100, "fatigue_load_limit_kN": 500, "max_rpm": 900, "reference_speed_rpm": 700, "limiting_speed_rpm": 900, "weight_g": 85500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NNCF5052-CV is the 260 mm bore entry in the NNCF5000 range: a 260×400×190 mm double-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 2860 kN / C0 5100 kN. Structurally, the NNCF design has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. In arrangement terms it is one-direction locating: the retained outer ring guides the shaft axially in one direction. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Speed planning for NNCF5052-CV: the catalogue lists 700 r/min thermal reference speed and 900 r/min mechanical limiting speed. The mass entry 85500 g covers the complete catalogue execution. Fit practice for NNCF5052-CV: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 190 mm-wide ring and concentrates load.", "The 2860/5100 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF5052-CV?", "a": "SKF NNCF 5052 CV is a double-row full-complement cylindrical roller bearing with 260 mm bore, 400 mm OD and 190 mm width per ISO 15. SKF lists C 2860 kN, C0 5100 kN, Pu 500 kN, reference speed 700 r/min and limiting speed 900 r/min, mass about 85500 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF5052-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF5052-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNF5052-B-2LS", "equiv_brand": "SKF", "level": "partial", "note": "Sealed, grease-packed counterpart (SKF NNF 5052 B-2LS) on the same ISO 15 260×400×190 mm envelope; contact seals both sides reduce the limiting speed and catalogue ratings differ by execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF5052-CV", "SKF NNCF 5052 CV" ], "locale_variants": {} }, { "sku": "NNCF5056-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 5056 CV", "series": "NNCF5000-series", "type": "cylindrical_roller", "d_mm": 280, "D_mm": 420, "B_mm": 190, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 2920, "static_load_kN": 5300, "fatigue_load_limit_kN": 520, "max_rpm": 850, "reference_speed_rpm": 670, "limiting_speed_rpm": 850, "weight_g": 90500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NNCF 5056 CV denotes a double-row full-complement cylindrical roller bearing on the ISO 15 280×420×190 mm envelope, dimension series 50 (compact heavy section, wide), with catalogue mass 90500 g. Structurally, the NNCF design has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. In arrangement terms it is one-direction locating: the retained outer ring guides the shaft axially in one direction. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Speed planning for NNCF5056-CV: the catalogue lists 670 r/min thermal reference speed and 850 r/min mechanical limiting speed. The mass entry 90500 g covers the complete catalogue execution. Mounting: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. A 280 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks", "mining shovel and dragline pivots" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 420 mm raceway.", "The 2920/5300 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF5056-CV?", "a": "SKF NNCF 5056 CV is a double-row full-complement cylindrical roller bearing with 280 mm bore, 420 mm OD and 190 mm width per ISO 15. SKF lists C 2920 kN, C0 5300 kN, Pu 520 kN, reference speed 670 r/min and limiting speed 850 r/min, mass about 90500 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF5056-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF5056-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNF5056-B-2LS", "equiv_brand": "SKF", "level": "partial", "note": "Sealed, grease-packed counterpart (SKF NNF 5056 B-2LS) on the same ISO 15 280×420×190 mm envelope; contact seals both sides reduce the limiting speed and catalogue ratings differ by execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF5056-CV", "SKF NNCF 5056 CV" ], "locale_variants": {} }, { "sku": "NNCF5060-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 5060 CV", "series": "NNCF5000-series", "type": "cylindrical_roller", "d_mm": 300, "D_mm": 460, "B_mm": 218, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 3520, "static_load_kN": 6550, "fatigue_load_limit_kN": 600, "max_rpm": 750, "reference_speed_rpm": 600, "limiting_speed_rpm": 750, "weight_g": 130000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NNCF 5060 CV denotes a double-row full-complement cylindrical roller bearing on the ISO 15 300×460×218 mm envelope, dimension series 50 (compact heavy section, wide), with catalogue mass 130000 g. Reading the NNCF prefix: a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. This makes the execution one-direction locating: the retained outer ring guides the shaft axially in one direction. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 1.86 (6550 against 3520 kN), and the Pu figure 600 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 600 r/min thermal reference speed and 750 r/min mechanical limiting speed. Assembly note: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 218 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 460 mm raceway.", "The 3520/6550 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF5060-CV?", "a": "SKF NNCF 5060 CV is a double-row full-complement cylindrical roller bearing with 300 mm bore, 460 mm OD and 218 mm width per ISO 15. SKF lists C 3520 kN, C0 6550 kN, Pu 600 kN, reference speed 600 r/min and limiting speed 750 r/min, mass about 130000 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF5060-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF5060-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNCF5060", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF5060-CV", "SKF NNCF 5060 CV" ], "locale_variants": {} }, { "sku": "NNCF5064-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 5064 CV", "series": "NNCF5000-series", "type": "cylindrical_roller", "d_mm": 320, "D_mm": 480, "B_mm": 218, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 3690, "static_load_kN": 6950, "fatigue_load_limit_kN": 620, "max_rpm": 700, "reference_speed_rpm": 560, "limiting_speed_rpm": 700, "weight_g": 135000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NNCF 5064 CV is a double-row full-complement cylindrical roller bearing sized 320×480×218 mm — a dimension series 50 (compact heavy section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.4. The NNCF configuration means a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes; functionally the bearing is one-direction locating: the retained outer ring guides the shaft axially in one direction. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 320 mm seat is about 11.53 kN/mm, typical of dimension series 50 (compact heavy section, wide); use C0 6950 kN for static checks such as crane hook blocks standing under load. Assembly note: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 480 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 3690/6950 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF5064-CV?", "a": "SKF NNCF 5064 CV is a double-row full-complement cylindrical roller bearing with 320 mm bore, 480 mm OD and 218 mm width per ISO 15. SKF lists C 3690 kN, C0 6950 kN, Pu 620 kN, reference speed 560 r/min and limiting speed 700 r/min, mass about 135000 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF5064-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF5064-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNCF5064", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF5064-CV", "SKF NNCF 5064 CV" ], "locale_variants": {} }, { "sku": "NNCF5068-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 5068 CV", "series": "NNCF5000-series", "type": "cylindrical_roller", "d_mm": 340, "D_mm": 520, "B_mm": 243, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 4400, "static_load_kN": 8300, "fatigue_load_limit_kN": 710, "max_rpm": 670, "reference_speed_rpm": 530, "limiting_speed_rpm": 670, "weight_g": 185000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 340 mm shaft, SKF lists NNCF5068-CV as double-row full-complement cylindrical roller: 520 mm OD, 243 mm wide, Pu 710 kN, the catalogue lists 530 r/min thermal reference speed and 670 r/min mechanical limiting speed. The NNCF configuration means a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes; functionally the bearing is one-direction locating: the retained outer ring guides the shaft axially in one direction. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Speed planning for NNCF5068-CV: the catalogue lists 530 r/min thermal reference speed and 670 r/min mechanical limiting speed. The mass entry 185000 g covers the complete catalogue execution. Fit practice for NNCF5068-CV: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 520 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 4400/8300 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF5068-CV?", "a": "SKF NNCF 5068 CV is a double-row full-complement cylindrical roller bearing with 340 mm bore, 520 mm OD and 243 mm width per ISO 15. SKF lists C 4400 kN, C0 8300 kN, Pu 710 kN, reference speed 530 r/min and limiting speed 670 r/min, mass about 185000 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF5068-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF5068-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNCF5068", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF5068-CV", "SKF NNCF 5068 CV" ], "locale_variants": {} }, { "sku": "NNCF5072-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 5072 CV", "series": "NNCF5000-series", "type": "cylindrical_roller", "d_mm": 360, "D_mm": 540, "B_mm": 243, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 4180, "static_load_kN": 8650, "fatigue_load_limit_kN": 735, "max_rpm": 630, "reference_speed_rpm": 500, "limiting_speed_rpm": 630, "weight_g": 195000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 360 mm shaft, SKF lists NNCF5072-CV as double-row full-complement cylindrical roller: 540 mm OD, 243 mm wide, Pu 735 kN, the catalogue lists 500 r/min thermal reference speed and 630 r/min mechanical limiting speed. Structurally, the NNCF design has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. In arrangement terms it is one-direction locating: the retained outer ring guides the shaft axially in one direction. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The radial section height is 90.0 mm and the catalogue mass 195000 g; at 4180 kN dynamic rating this is roughly 11.61 kN of C per millimetre of bore before application factors. Fit practice for NNCF5072-CV: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 243 mm-wide ring and concentrates load.", "The 4180/8650 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF5072-CV?", "a": "SKF NNCF 5072 CV is a double-row full-complement cylindrical roller bearing with 360 mm bore, 540 mm OD and 243 mm width per ISO 15. SKF lists C 4180 kN, C0 8650 kN, Pu 735 kN, reference speed 500 r/min and limiting speed 630 r/min, mass about 195000 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF5072-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF5072-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNCF5072", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF5072-CV", "SKF NNCF 5072 CV" ], "locale_variants": {} }, { "sku": "NNCF5076-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 5076 CV", "series": "NNCF5000-series", "type": "cylindrical_roller", "d_mm": 380, "D_mm": 560, "B_mm": 243, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 4680, "static_load_kN": 9150, "fatigue_load_limit_kN": 750, "max_rpm": 600, "reference_speed_rpm": 480, "limiting_speed_rpm": 600, "weight_g": 200000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NNCF5076-CV is the 380 mm bore entry in the NNCF5000 range: a 380×560×243 mm double-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 4680 kN / C0 9150 kN. Reading the NNCF prefix: a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. This makes the execution one-direction locating: the retained outer ring guides the shaft axially in one direction. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 1.96 (9150 against 4680 kN), and the Pu figure 750 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 480 r/min thermal reference speed and 600 r/min mechanical limiting speed. Fit practice for NNCF5076-CV: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 243 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 560 mm raceway.", "The 4680/9150 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF5076-CV?", "a": "SKF NNCF 5076 CV is a double-row full-complement cylindrical roller bearing with 380 mm bore, 560 mm OD and 243 mm width per ISO 15. SKF lists C 4680 kN, C0 9150 kN, Pu 750 kN, reference speed 480 r/min and limiting speed 600 r/min, mass about 200000 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF5076-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF5076-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNCF5076", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF5076-CV", "SKF NNCF 5076 CV" ], "locale_variants": {} }, { "sku": "NNCF5080-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCF 5080 CV", "series": "NNCF5000-series", "type": "cylindrical_roller", "d_mm": 400, "D_mm": 600, "B_mm": 272, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 5500, "static_load_kN": 11000, "fatigue_load_limit_kN": 900, "max_rpm": 560, "reference_speed_rpm": 450, "limiting_speed_rpm": 560, "weight_g": 270000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NNCF 5080 CV resolves to a 400×600×272 mm double-row full-complement cylindrical roller bearing (dimension series 50 (compact heavy section, wide)); a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes. The NNCF configuration means a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes; functionally the bearing is one-direction locating: the retained outer ring guides the shaft axially in one direction. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. With C 5500 kN and C0 11000 kN, size the bearing on the 400×600 mm ISO 15 envelope and check the 900 kN Pu against the equivalent-load floor; the catalogue lists 450 r/min thermal reference speed and 560 r/min mechanical limiting speed. Assembly note: the retaining ring must never be loaded axially in operation; route relubrication through the outer-ring groove and keep the unit non-separable during handling. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "large offshore winch and hook blocks", "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 600 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 600 mm raceway.", "The 5500/11000 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCF5080-CV?", "a": "SKF NNCF 5080 CV is a double-row full-complement cylindrical roller bearing with 400 mm bore, 600 mm OD and 272 mm width per ISO 15. SKF lists C 5500 kN, C0 11000 kN, Pu 900 kN, reference speed 450 r/min and limiting speed 560 r/min, mass about 270000 g." }, { "q": "What does the NNCF designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a non-separable double-row full complement bearing with three integral flanges on the inner ring and one retaining ring in the outer ring; the outer ring also has an annular lubrication groove with holes." }, { "q": "Can NNCF5080-CV take axial load and locate the shaft?", "a": "In one direction, via the retained outer ring; the retaining ring is not a load path for continuous thrust." }, { "q": "How does NNCF5080-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNCF5080", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCF5080-CV", "SKF NNCF 5080 CV" ], "locale_variants": {} }, { "sku": "NNCL4830-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCL 4830 CV", "series": "NNCL4800-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 190, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 255, "static_load_kN": 585, "fatigue_load_limit_kN": 60, "max_rpm": 1800, "reference_speed_rpm": 1500, "limiting_speed_rpm": 1800, "weight_g": 2700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NNCL4830-CV is the 150 mm bore entry in the NNCL4800 range: a 150×190×40 mm double-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 255 kN / C0 585 kN. Reading the NNCL prefix: a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set. This makes the execution non-locating: the outer ring can be displaced axially, like an NN design, to absorb shaft expansion. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. With C 255 kN and C0 585 kN, size the bearing on the 150×190 mm ISO 15 envelope and check the 60 kN Pu against the equivalent-load floor; the catalogue lists 1,500 r/min thermal reference speed and 1,800 r/min mechanical limiting speed. Assembly note: treat the outer ring as the floating element; keep the inner ring with its three flanges square on the shaft and relubricate through the outer-ring groove. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks", "mining shovel and dragline pivots" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 40 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 255/585 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCL4830-CV?", "a": "SKF NNCL 4830 CV is a double-row full-complement cylindrical roller bearing with 150 mm bore, 190 mm OD and 40 mm width per ISO 15. SKF lists C 255 kN, C0 585 kN, Pu 60 kN, reference speed 1,500 r/min and limiting speed 1,800 r/min, mass about 2700 g." }, { "q": "What does the NNCL designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set." }, { "q": "Can NNCL4830-CV take axial load and locate the shaft?", "a": "No — the smooth outer ring floats, making NNCL the non-locating member of the arrangement." }, { "q": "How does NNCL4830-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4830-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 150×190×40 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCF4830-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 150×190×40 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCL4830-CV", "SKF NNCL 4830 CV" ], "locale_variants": {} }, { "sku": "NNCL4832-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCL 4832 CV", "series": "NNCL4800-series", "type": "cylindrical_roller", "d_mm": 160, "D_mm": 200, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 260, "static_load_kN": 610, "fatigue_load_limit_kN": 62, "max_rpm": 1700, "reference_speed_rpm": 1400, "limiting_speed_rpm": 1700, "weight_g": 2900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NNCL 4832 CV is a double-row full-complement cylindrical roller bearing sized 160×200×40 mm — a dimension series 48 (compact heavy section), listed in SKF catalogue PUB BU/P1 17000 ch. 6.4. Reading the NNCL prefix: a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set. This makes the execution non-locating: the outer ring can be displaced axially, like an NN design, to absorb shaft expansion. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The radial section height is 20.0 mm and the catalogue mass 2900 g; at 260 kN dynamic rating this is roughly 1.63 kN of C per millimetre of bore before application factors. Fit practice for NNCL4832-CV: treat the outer ring as the floating element; keep the inner ring with its three flanges square on the shaft and relubricate through the outer-ring groove. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "large offshore winch and hook blocks", "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 40 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 40 mm-wide ring and concentrates load.", "The 260/610 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCL4832-CV?", "a": "SKF NNCL 4832 CV is a double-row full-complement cylindrical roller bearing with 160 mm bore, 200 mm OD and 40 mm width per ISO 15. SKF lists C 260 kN, C0 610 kN, Pu 62 kN, reference speed 1,400 r/min and limiting speed 1,700 r/min, mass about 2900 g." }, { "q": "What does the NNCL designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set." }, { "q": "Can NNCL4832-CV take axial load and locate the shaft?", "a": "No — the smooth outer ring floats, making NNCL the non-locating member of the arrangement." }, { "q": "How does NNCL4832-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4832-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 160×200×40 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCF4832-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 160×200×40 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCL4832-CV", "SKF NNCL 4832 CV" ], "locale_variants": {} }, { "sku": "NNCL4834-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCL 4834 CV", "series": "NNCL4800-series", "type": "cylindrical_roller", "d_mm": 170, "D_mm": 215, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 286, "static_load_kN": 655, "fatigue_load_limit_kN": 65.5, "max_rpm": 1600, "reference_speed_rpm": 1300, "limiting_speed_rpm": 1600, "weight_g": 3900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NNCL 4834 CV resolves to a 170×215×45 mm double-row full-complement cylindrical roller bearing (dimension series 48 (compact heavy section)); a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set. Reading the NNCL prefix: a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set. This makes the execution non-locating: the outer ring can be displaced axially, like an NN design, to absorb shaft expansion. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. The radial section height is 22.5 mm and the catalogue mass 3900 g; at 286 kN dynamic rating this is roughly 1.68 kN of C per millimetre of bore before application factors. Fit practice for NNCL4834-CV: treat the outer ring as the floating element; keep the inner ring with its three flanges square on the shaft and relubricate through the outer-ring groove. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks", "mining shovel and dragline pivots" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 45 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 286/655 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCL4834-CV?", "a": "SKF NNCL 4834 CV is a double-row full-complement cylindrical roller bearing with 170 mm bore, 215 mm OD and 45 mm width per ISO 15. SKF lists C 286 kN, C0 655 kN, Pu 65.5 kN, reference speed 1,300 r/min and limiting speed 1,600 r/min, mass about 3900 g." }, { "q": "What does the NNCL designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set." }, { "q": "Can NNCL4834-CV take axial load and locate the shaft?", "a": "No — the smooth outer ring floats, making NNCL the non-locating member of the arrangement." }, { "q": "How does NNCL4834-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4834-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 170×215×45 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCF4834-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 170×215×45 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCL4834-CV", "SKF NNCL 4834 CV" ], "locale_variants": {} }, { "sku": "NNCL4836-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCL 4836 CV", "series": "NNCL4800-series", "type": "cylindrical_roller", "d_mm": 180, "D_mm": 225, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 297, "static_load_kN": 695, "fatigue_load_limit_kN": 69.5, "max_rpm": 1500, "reference_speed_rpm": 1200, "limiting_speed_rpm": 1500, "weight_g": 4100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 180 mm shaft, SKF lists NNCL4836-CV as double-row full-complement cylindrical roller: 225 mm OD, 45 mm wide, Pu 69.5 kN, the catalogue lists 1,200 r/min thermal reference speed and 1,500 r/min mechanical limiting speed. Reading the NNCL prefix: a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set. This makes the execution non-locating: the outer ring can be displaced axially, like an NN design, to absorb shaft expansion. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. The radial section height is 22.5 mm and the catalogue mass 4100 g; at 297 kN dynamic rating this is roughly 1.65 kN of C per millimetre of bore before application factors. Fit practice for NNCL4836-CV: treat the outer ring as the floating element; keep the inner ring with its three flanges square on the shaft and relubricate through the outer-ring groove. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 45 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 225 mm raceway.", "The 297/695 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCL4836-CV?", "a": "SKF NNCL 4836 CV is a double-row full-complement cylindrical roller bearing with 180 mm bore, 225 mm OD and 45 mm width per ISO 15. SKF lists C 297 kN, C0 695 kN, Pu 69.5 kN, reference speed 1,200 r/min and limiting speed 1,500 r/min, mass about 4100 g." }, { "q": "What does the NNCL designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set." }, { "q": "Can NNCL4836-CV take axial load and locate the shaft?", "a": "No — the smooth outer ring floats, making NNCL the non-locating member of the arrangement." }, { "q": "How does NNCL4836-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4836-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 180×225×45 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCF4836-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 180×225×45 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCL4836-CV", "SKF NNCL 4836 CV" ], "locale_variants": {} }, { "sku": "NNCL4838-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCL 4838 CV", "series": "NNCL4800-series", "type": "cylindrical_roller", "d_mm": 190, "D_mm": 240, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 358, "static_load_kN": 750, "fatigue_load_limit_kN": 76.5, "max_rpm": 1400, "reference_speed_rpm": 1100, "limiting_speed_rpm": 1400, "weight_g": 5300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NNCL 4838 CV is a double-row full-complement cylindrical roller bearing sized 190×240×50 mm — a dimension series 48 (compact heavy section), listed in SKF catalogue PUB BU/P1 17000 ch. 6.4. Reading the NNCL prefix: a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set. This makes the execution non-locating: the outer ring can be displaced axially, like an NN design, to absorb shaft expansion. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. The radial section height is 25.0 mm and the catalogue mass 5300 g; at 358 kN dynamic rating this is roughly 1.88 kN of C per millimetre of bore before application factors. Mounting: treat the outer ring as the floating element; keep the inner ring with its three flanges square on the shaft and relubricate through the outer-ring groove. A 190 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "large offshore winch and hook blocks", "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 50 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 50 mm-wide ring and concentrates load.", "The 358/750 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCL4838-CV?", "a": "SKF NNCL 4838 CV is a double-row full-complement cylindrical roller bearing with 190 mm bore, 240 mm OD and 50 mm width per ISO 15. SKF lists C 358 kN, C0 750 kN, Pu 76.5 kN, reference speed 1,100 r/min and limiting speed 1,400 r/min, mass about 5300 g." }, { "q": "What does the NNCL designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set." }, { "q": "Can NNCL4838-CV take axial load and locate the shaft?", "a": "No — the smooth outer ring floats, making NNCL the non-locating member of the arrangement." }, { "q": "How does NNCL4838-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4838-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 190×240×50 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCF4838-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 190×240×50 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCL4838-CV", "SKF NNCL 4838 CV" ], "locale_variants": {} }, { "sku": "NNCL4840-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCL 4840 CV", "series": "NNCL4800-series", "type": "cylindrical_roller", "d_mm": 200, "D_mm": 250, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 369, "static_load_kN": 800, "fatigue_load_limit_kN": 80, "max_rpm": 1400, "reference_speed_rpm": 1100, "limiting_speed_rpm": 1400, "weight_g": 5700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NNCL4840-CV is the 200 mm bore entry in the NNCL4800 range: a 200×250×50 mm double-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 369 kN / C0 800 kN. Structurally, the NNCL design has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set. In arrangement terms it is non-locating: the outer ring can be displaced axially, like an NN design, to absorb shaft expansion. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Speed planning for NNCL4840-CV: the catalogue lists 1,100 r/min thermal reference speed and 1,400 r/min mechanical limiting speed. The mass entry 5700 g covers the complete catalogue execution. Mounting: treat the outer ring as the floating element; keep the inner ring with its three flanges square on the shaft and relubricate through the outer-ring groove. A 200 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "large offshore winch and hook blocks", "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 369/800 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCL4840-CV?", "a": "SKF NNCL 4840 CV is a double-row full-complement cylindrical roller bearing with 200 mm bore, 250 mm OD and 50 mm width per ISO 15. SKF lists C 369 kN, C0 800 kN, Pu 80 kN, reference speed 1,100 r/min and limiting speed 1,400 r/min, mass about 5700 g." }, { "q": "What does the NNCL designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set." }, { "q": "Can NNCL4840-CV take axial load and locate the shaft?", "a": "No — the smooth outer ring floats, making NNCL the non-locating member of the arrangement." }, { "q": "How does NNCL4840-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4840-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 200×250×50 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCF4840-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 200×250×50 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCL4840-CV", "SKF NNCL 4840 CV" ], "locale_variants": {} }, { "sku": "NNCL4844-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCL 4844 CV", "series": "NNCL4800-series", "type": "cylindrical_roller", "d_mm": 220, "D_mm": 270, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 380, "static_load_kN": 865, "fatigue_load_limit_kN": 85, "max_rpm": 1200, "reference_speed_rpm": 1000, "limiting_speed_rpm": 1200, "weight_g": 6200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NNCL 4844 CV resolves to a 220×270×50 mm double-row full-complement cylindrical roller bearing (dimension series 48 (compact heavy section)); a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set. Structurally, the NNCL design has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set. In arrangement terms it is non-locating: the outer ring can be displaced axially, like an NN design, to absorb shaft expansion. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. With C 380 kN and C0 865 kN, size the bearing on the 220×270 mm ISO 15 envelope and check the 85 kN Pu against the equivalent-load floor; the catalogue lists 1,000 r/min thermal reference speed and 1,200 r/min mechanical limiting speed. Assembly note: treat the outer ring as the floating element; keep the inner ring with its three flanges square on the shaft and relubricate through the outer-ring groove. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "large offshore winch and hook blocks", "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 380/865 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCL4844-CV?", "a": "SKF NNCL 4844 CV is a double-row full-complement cylindrical roller bearing with 220 mm bore, 270 mm OD and 50 mm width per ISO 15. SKF lists C 380 kN, C0 865 kN, Pu 85 kN, reference speed 1,000 r/min and limiting speed 1,200 r/min, mass about 6200 g." }, { "q": "What does the NNCL designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set." }, { "q": "Can NNCL4844-CV take axial load and locate the shaft?", "a": "No — the smooth outer ring floats, making NNCL the non-locating member of the arrangement." }, { "q": "How does NNCL4844-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4844-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 220×270×50 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCF4844-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 220×270×50 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCL4844-CV", "SKF NNCL 4844 CV" ], "locale_variants": {} }, { "sku": "NNCL4848-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCL 4848 CV", "series": "NNCL4800-series", "type": "cylindrical_roller", "d_mm": 240, "D_mm": 300, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 539, "static_load_kN": 1290, "fatigue_load_limit_kN": 125, "max_rpm": 1100, "reference_speed_rpm": 900, "limiting_speed_rpm": 1100, "weight_g": 9800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NNCL 4848 CV denotes a double-row full-complement cylindrical roller bearing on the ISO 15 240×300×60 mm envelope, dimension series 48 (compact heavy section), with catalogue mass 9800 g. Structurally, the NNCL design has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set. In arrangement terms it is non-locating: the outer ring can be displaced axially, like an NN design, to absorb shaft expansion. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. The radial section height is 30.0 mm and the catalogue mass 9800 g; at 539 kN dynamic rating this is roughly 2.25 kN of C per millimetre of bore before application factors. Fit practice for NNCL4848-CV: treat the outer ring as the floating element; keep the inner ring with its three flanges square on the shaft and relubricate through the outer-ring groove. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "large offshore winch and hook blocks", "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 539/1290 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCL4848-CV?", "a": "SKF NNCL 4848 CV is a double-row full-complement cylindrical roller bearing with 240 mm bore, 300 mm OD and 60 mm width per ISO 15. SKF lists C 539 kN, C0 1290 kN, Pu 125 kN, reference speed 900 r/min and limiting speed 1,100 r/min, mass about 9800 g." }, { "q": "What does the NNCL designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set." }, { "q": "Can NNCL4848-CV take axial load and locate the shaft?", "a": "No — the smooth outer ring floats, making NNCL the non-locating member of the arrangement." }, { "q": "How does NNCL4848-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4848-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 240×300×60 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCF4848-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 240×300×60 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCL4848-CV", "SKF NNCL 4848 CV" ], "locale_variants": {} }, { "sku": "NNCL4852-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCL 4852 CV", "series": "NNCL4800-series", "type": "cylindrical_roller", "d_mm": 260, "D_mm": 320, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 561, "static_load_kN": 1400, "fatigue_load_limit_kN": 132, "max_rpm": 1000, "reference_speed_rpm": 800, "limiting_speed_rpm": 1000, "weight_g": 10500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NNCL 4852 CV denotes a double-row full-complement cylindrical roller bearing on the ISO 15 260×320×60 mm envelope, dimension series 48 (compact heavy section), with catalogue mass 10500 g. Reading the NNCL prefix: a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set. This makes the execution non-locating: the outer ring can be displaced axially, like an NN design, to absorb shaft expansion. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 260 mm seat is about 2.16 kN/mm, typical of dimension series 48 (compact heavy section); use C0 1400 kN for static checks such as crane hook blocks standing under load. Fit practice for NNCL4852-CV: treat the outer ring as the floating element; keep the inner ring with its three flanges square on the shaft and relubricate through the outer-ring groove. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "large offshore winch and hook blocks", "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 60 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 60 mm-wide ring and concentrates load.", "The 561/1400 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCL4852-CV?", "a": "SKF NNCL 4852 CV is a double-row full-complement cylindrical roller bearing with 260 mm bore, 320 mm OD and 60 mm width per ISO 15. SKF lists C 561 kN, C0 1400 kN, Pu 132 kN, reference speed 800 r/min and limiting speed 1,000 r/min, mass about 10500 g." }, { "q": "What does the NNCL designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set." }, { "q": "Can NNCL4852-CV take axial load and locate the shaft?", "a": "No — the smooth outer ring floats, making NNCL the non-locating member of the arrangement." }, { "q": "How does NNCL4852-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4852-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 260×320×60 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCF4852-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 260×320×60 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCL4852-CV", "SKF NNCL 4852 CV" ], "locale_variants": {} }, { "sku": "NNCL4856-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCL 4856 CV", "series": "NNCL4800-series", "type": "cylindrical_roller", "d_mm": 280, "D_mm": 350, "B_mm": 69, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 737, "static_load_kN": 1860, "fatigue_load_limit_kN": 173, "max_rpm": 950, "reference_speed_rpm": 750, "limiting_speed_rpm": 950, "weight_g": 15500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NNCL 4856 CV is a double-row full-complement cylindrical roller bearing sized 280×350×69 mm — a dimension series 48 (compact heavy section), listed in SKF catalogue PUB BU/P1 17000 ch. 6.4. The NNCL configuration means a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set; functionally the bearing is non-locating: the outer ring can be displaced axially, like an NN design, to absorb shaft expansion. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Speed planning for NNCL4856-CV: the catalogue lists 750 r/min thermal reference speed and 950 r/min mechanical limiting speed. The mass entry 15500 g covers the complete catalogue execution. Fit practice for NNCL4856-CV: treat the outer ring as the floating element; keep the inner ring with its three flanges square on the shaft and relubricate through the outer-ring groove. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "large offshore winch and hook blocks", "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 350 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 350 mm raceway.", "The 737/1860 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCL4856-CV?", "a": "SKF NNCL 4856 CV is a double-row full-complement cylindrical roller bearing with 280 mm bore, 350 mm OD and 69 mm width per ISO 15. SKF lists C 737 kN, C0 1860 kN, Pu 173 kN, reference speed 750 r/min and limiting speed 950 r/min, mass about 15500 g." }, { "q": "What does the NNCL designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set." }, { "q": "Can NNCL4856-CV take axial load and locate the shaft?", "a": "No — the smooth outer ring floats, making NNCL the non-locating member of the arrangement." }, { "q": "How does NNCL4856-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4856-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 280×350×69 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCF4856-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 280×350×69 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCL4856-CV", "SKF NNCL 4856 CV" ], "locale_variants": {} }, { "sku": "NNCL4860-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCL 4860 CV", "series": "NNCL4800-series", "type": "cylindrical_roller", "d_mm": 300, "D_mm": 380, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 858, "static_load_kN": 2120, "fatigue_load_limit_kN": 196, "max_rpm": 850, "reference_speed_rpm": 700, "limiting_speed_rpm": 850, "weight_g": 22000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 300 mm shaft, SKF lists NNCL4860-CV as double-row full-complement cylindrical roller: 380 mm OD, 80 mm wide, Pu 196 kN, the catalogue lists 700 r/min thermal reference speed and 850 r/min mechanical limiting speed. Structurally, the NNCL design has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set. In arrangement terms it is non-locating: the outer ring can be displaced axially, like an NN design, to absorb shaft expansion. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 2.47 (2120 against 858 kN), and the Pu figure 196 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 700 r/min thermal reference speed and 850 r/min mechanical limiting speed. Assembly note: treat the outer ring as the floating element; keep the inner ring with its three flanges square on the shaft and relubricate through the outer-ring groove. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks", "mining shovel and dragline pivots" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 380 mm raceway.", "The 858/2120 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCL4860-CV?", "a": "SKF NNCL 4860 CV is a double-row full-complement cylindrical roller bearing with 300 mm bore, 380 mm OD and 80 mm width per ISO 15. SKF lists C 858 kN, C0 2120 kN, Pu 196 kN, reference speed 700 r/min and limiting speed 850 r/min, mass about 22000 g." }, { "q": "What does the NNCL designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set." }, { "q": "Can NNCL4860-CV take axial load and locate the shaft?", "a": "No — the smooth outer ring floats, making NNCL the non-locating member of the arrangement." }, { "q": "How does NNCL4860-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4860-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 300×380×80 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCF4860-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 300×380×80 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCL4860-CV", "SKF NNCL 4860 CV" ], "locale_variants": {} }, { "sku": "NNCL4864-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCL 4864 CV", "series": "NNCL4800-series", "type": "cylindrical_roller", "d_mm": 320, "D_mm": 400, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 897, "static_load_kN": 2280, "fatigue_load_limit_kN": 208, "max_rpm": 800, "reference_speed_rpm": 630, "limiting_speed_rpm": 800, "weight_g": 23000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NNCL4864-CV is the 320 mm bore entry in the NNCL4800 range: a 320×400×80 mm double-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 897 kN / C0 2280 kN. Structurally, the NNCL design has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set. In arrangement terms it is non-locating: the outer ring can be displaced axially, like an NN design, to absorb shaft expansion. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 2.54 (2280 against 897 kN), and the Pu figure 208 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 630 r/min thermal reference speed and 800 r/min mechanical limiting speed. Assembly note: treat the outer ring as the floating element; keep the inner ring with its three flanges square on the shaft and relubricate through the outer-ring groove. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "large offshore winch and hook blocks", "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 897/2280 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCL4864-CV?", "a": "SKF NNCL 4864 CV is a double-row full-complement cylindrical roller bearing with 320 mm bore, 400 mm OD and 80 mm width per ISO 15. SKF lists C 897 kN, C0 2280 kN, Pu 208 kN, reference speed 630 r/min and limiting speed 800 r/min, mass about 23000 g." }, { "q": "What does the NNCL designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set." }, { "q": "Can NNCL4864-CV take axial load and locate the shaft?", "a": "No — the smooth outer ring floats, making NNCL the non-locating member of the arrangement." }, { "q": "How does NNCL4864-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4864-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 320×400×80 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCF4864-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 320×400×80 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCL4864-CV", "SKF NNCL 4864 CV" ], "locale_variants": {} }, { "sku": "NNCL4868-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCL 4868 CV", "series": "NNCL4800-series", "type": "cylindrical_roller", "d_mm": 340, "D_mm": 420, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 913, "static_load_kN": 2400, "fatigue_load_limit_kN": 216, "max_rpm": 750, "reference_speed_rpm": 600, "limiting_speed_rpm": 750, "weight_g": 25500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NNCL 4868 CV resolves to a 340×420×80 mm double-row full-complement cylindrical roller bearing (dimension series 48 (compact heavy section)); a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set. Reading the NNCL prefix: a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set. This makes the execution non-locating: the outer ring can be displaced axially, like an NN design, to absorb shaft expansion. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Speed planning for NNCL4868-CV: the catalogue lists 600 r/min thermal reference speed and 750 r/min mechanical limiting speed. The mass entry 25500 g covers the complete catalogue execution. Fit practice for NNCL4868-CV: treat the outer ring as the floating element; keep the inner ring with its three flanges square on the shaft and relubricate through the outer-ring groove. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks", "mining shovel and dragline pivots" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 80 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 913/2400 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCL4868-CV?", "a": "SKF NNCL 4868 CV is a double-row full-complement cylindrical roller bearing with 340 mm bore, 420 mm OD and 80 mm width per ISO 15. SKF lists C 913 kN, C0 2400 kN, Pu 216 kN, reference speed 600 r/min and limiting speed 750 r/min, mass about 25500 g." }, { "q": "What does the NNCL designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set." }, { "q": "Can NNCL4868-CV take axial load and locate the shaft?", "a": "No — the smooth outer ring floats, making NNCL the non-locating member of the arrangement." }, { "q": "How does NNCL4868-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4868-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 340×420×80 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCF4868-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 340×420×80 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCL4868-CV", "SKF NNCL 4868 CV" ], "locale_variants": {} }, { "sku": "NNCL4872-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCL 4872 CV", "series": "NNCL4800-series", "type": "cylindrical_roller", "d_mm": 360, "D_mm": 440, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 935, "static_load_kN": 2550, "fatigue_load_limit_kN": 224, "max_rpm": 700, "reference_speed_rpm": 560, "limiting_speed_rpm": 700, "weight_g": 26000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NNCL 4872 CV resolves to a 360×440×80 mm double-row full-complement cylindrical roller bearing (dimension series 48 (compact heavy section)); a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set. The NNCL configuration means a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set; functionally the bearing is non-locating: the outer ring can be displaced axially, like an NN design, to absorb shaft expansion. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The radial section height is 40.0 mm and the catalogue mass 26000 g; at 935 kN dynamic rating this is roughly 2.60 kN of C per millimetre of bore before application factors. Fit practice for NNCL4872-CV: treat the outer ring as the floating element; keep the inner ring with its three flanges square on the shaft and relubricate through the outer-ring groove. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks", "mining shovel and dragline pivots" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 440 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 80 mm-wide ring and concentrates load.", "The 935/2550 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCL4872-CV?", "a": "SKF NNCL 4872 CV is a double-row full-complement cylindrical roller bearing with 360 mm bore, 440 mm OD and 80 mm width per ISO 15. SKF lists C 935 kN, C0 2550 kN, Pu 224 kN, reference speed 560 r/min and limiting speed 700 r/min, mass about 26000 g." }, { "q": "What does the NNCL designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set." }, { "q": "Can NNCL4872-CV take axial load and locate the shaft?", "a": "No — the smooth outer ring floats, making NNCL the non-locating member of the arrangement." }, { "q": "How does NNCL4872-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4872-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 360×440×80 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCF4872-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 360×440×80 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCL4872-CV", "SKF NNCL 4872 CV" ], "locale_variants": {} }, { "sku": "NNCL4876-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCL 4876 CV", "series": "NNCL4800-series", "type": "cylindrical_roller", "d_mm": 380, "D_mm": 480, "B_mm": 100, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1400, "static_load_kN": 3650, "fatigue_load_limit_kN": 315, "max_rpm": 670, "reference_speed_rpm": 530, "limiting_speed_rpm": 670, "weight_g": 44000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NNCL 4876 CV denotes a double-row full-complement cylindrical roller bearing on the ISO 15 380×480×100 mm envelope, dimension series 48 (compact heavy section), with catalogue mass 44000 g. The NNCL configuration means a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set; functionally the bearing is non-locating: the outer ring can be displaced axially, like an NN design, to absorb shaft expansion. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. The radial section height is 50.0 mm and the catalogue mass 44000 g; at 1400 kN dynamic rating this is roughly 3.68 kN of C per millimetre of bore before application factors. Fit practice for NNCL4876-CV: treat the outer ring as the floating element; keep the inner ring with its three flanges square on the shaft and relubricate through the outer-ring groove. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "large offshore winch and hook blocks", "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 480 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 480 mm raceway.", "The 1400/3650 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCL4876-CV?", "a": "SKF NNCL 4876 CV is a double-row full-complement cylindrical roller bearing with 380 mm bore, 480 mm OD and 100 mm width per ISO 15. SKF lists C 1400 kN, C0 3650 kN, Pu 315 kN, reference speed 530 r/min and limiting speed 670 r/min, mass about 44000 g." }, { "q": "What does the NNCL designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set." }, { "q": "Can NNCL4876-CV take axial load and locate the shaft?", "a": "No — the smooth outer ring floats, making NNCL the non-locating member of the arrangement." }, { "q": "How does NNCL4876-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4876-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 380×480×100 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCF4876-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 380×480×100 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCL4876-CV", "SKF NNCL 4876 CV" ], "locale_variants": {} }, { "sku": "NNCL4880-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCL 4880 CV", "series": "NNCL4800-series", "type": "cylindrical_roller", "d_mm": 400, "D_mm": 500, "B_mm": 100, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1420, "static_load_kN": 3750, "fatigue_load_limit_kN": 325, "max_rpm": 630, "reference_speed_rpm": 500, "limiting_speed_rpm": 630, "weight_g": 46000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NNCL 4880 CV denotes a double-row full-complement cylindrical roller bearing on the ISO 15 400×500×100 mm envelope, dimension series 48 (compact heavy section), with catalogue mass 46000 g. Reading the NNCL prefix: a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set. This makes the execution non-locating: the outer ring can be displaced axially, like an NN design, to absorb shaft expansion. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. With C 1420 kN and C0 3750 kN, size the bearing on the 400×500 mm ISO 15 envelope and check the 325 kN Pu against the equivalent-load floor; the catalogue lists 500 r/min thermal reference speed and 630 r/min mechanical limiting speed. Mounting: treat the outer ring as the floating element; keep the inner ring with its three flanges square on the shaft and relubricate through the outer-ring groove. A 400 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 100 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 500 mm raceway.", "The 1420/3750 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCL4880-CV?", "a": "SKF NNCL 4880 CV is a double-row full-complement cylindrical roller bearing with 400 mm bore, 500 mm OD and 100 mm width per ISO 15. SKF lists C 1420 kN, C0 3750 kN, Pu 325 kN, reference speed 500 r/min and limiting speed 630 r/min, mass about 46000 g." }, { "q": "What does the NNCL designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set." }, { "q": "Can NNCL4880-CV take axial load and locate the shaft?", "a": "No — the smooth outer ring floats, making NNCL the non-locating member of the arrangement." }, { "q": "How does NNCL4880-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4880-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 400×500×100 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCF4880-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 400×500×100 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCL4880-CV", "SKF NNCL 4880 CV" ], "locale_variants": {} }, { "sku": "NNCL4912-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCL 4912 CV", "series": "NNCL4900-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 85, "B_mm": 25, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 78.1, "static_load_kN": 137, "fatigue_load_limit_kN": 14.3, "max_rpm": 4500, "reference_speed_rpm": 3600, "limiting_speed_rpm": 4500, "weight_g": 470, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NNCL 4912 CV resolves to a 60×85×25 mm double-row full-complement cylindrical roller bearing (dimension series 49 (compact heavy section)); a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set. Structurally, the NNCL design has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set. In arrangement terms it is non-locating: the outer ring can be displaced axially, like an NN design, to absorb shaft expansion. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 1.75 (137 against 78.1 kN), and the Pu figure 14.3 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 3,600 r/min thermal reference speed and 4,500 r/min mechanical limiting speed. Fit practice for NNCL4912-CV: treat the outer ring as the floating element; keep the inner ring with its three flanges square on the shaft and relubricate through the outer-ring groove. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "large crane and winch drums", "offshore crane sheaves", "heavy material-handling rope pulleys", "rolling-mill and caster drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 78.1/137 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCL4912-CV?", "a": "SKF NNCL 4912 CV is a double-row full-complement cylindrical roller bearing with 60 mm bore, 85 mm OD and 25 mm width per ISO 15. SKF lists C 78.1 kN, C0 137 kN, Pu 14.3 kN, reference speed 3,600 r/min and limiting speed 4,500 r/min, mass about 470 g." }, { "q": "What does the NNCL designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set." }, { "q": "Can NNCL4912-CV take axial load and locate the shaft?", "a": "No — the smooth outer ring floats, making NNCL the non-locating member of the arrangement." }, { "q": "How does NNCL4912-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4912-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 60×85×25 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCF4912-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 60×85×25 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCL4912-CV", "SKF NNCL 4912 CV" ], "locale_variants": {} }, { "sku": "NNCL4914-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCL 4914 CV", "series": "NNCL4900-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 100, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 114, "static_load_kN": 193, "fatigue_load_limit_kN": 22.4, "max_rpm": 3800, "reference_speed_rpm": 3000, "limiting_speed_rpm": 3800, "weight_g": 750, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 70 mm shaft, SKF lists NNCL4914-CV as double-row full-complement cylindrical roller: 100 mm OD, 30 mm wide, Pu 22.4 kN, the catalogue lists 3,000 r/min thermal reference speed and 3,800 r/min mechanical limiting speed. Structurally, the NNCL design has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set. In arrangement terms it is non-locating: the outer ring can be displaced axially, like an NN design, to absorb shaft expansion. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Load-per-bore for the 70 mm seat is about 1.63 kN/mm, typical of dimension series 49 (compact heavy section); use C0 193 kN for static checks such as crane hook blocks standing under load. Mounting: treat the outer ring as the floating element; keep the inner ring with its three flanges square on the shaft and relubricate through the outer-ring groove. A 70 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "heavy material-handling rope pulleys", "rolling-mill and caster drives", "large crane and winch drums", "offshore crane sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 30 mm-wide ring and concentrates load.", "The 114/193 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCL4914-CV?", "a": "SKF NNCL 4914 CV is a double-row full-complement cylindrical roller bearing with 70 mm bore, 100 mm OD and 30 mm width per ISO 15. SKF lists C 114 kN, C0 193 kN, Pu 22.4 kN, reference speed 3,000 r/min and limiting speed 3,800 r/min, mass about 750 g." }, { "q": "What does the NNCL designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set." }, { "q": "Can NNCL4914-CV take axial load and locate the shaft?", "a": "No — the smooth outer ring floats, making NNCL the non-locating member of the arrangement." }, { "q": "How does NNCL4914-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4914-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 70×100×30 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCF4914-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 70×100×30 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCL4914-CV", "SKF NNCL 4914 CV" ], "locale_variants": {} }, { "sku": "NNCL4916-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCL 4916 CV", "series": "NNCL4900-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 110, "B_mm": 30, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 121, "static_load_kN": 216, "fatigue_load_limit_kN": 25, "max_rpm": 3400, "reference_speed_rpm": 2600, "limiting_speed_rpm": 3400, "weight_g": 850, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NNCL 4916 CV denotes a double-row full-complement cylindrical roller bearing on the ISO 15 80×110×30 mm envelope, dimension series 49 (compact heavy section), with catalogue mass 850 g. Structurally, the NNCL design has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set. In arrangement terms it is non-locating: the outer ring can be displaced axially, like an NN design, to absorb shaft expansion. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 80 mm seat is about 1.51 kN/mm, typical of dimension series 49 (compact heavy section); use C0 216 kN for static checks such as crane hook blocks standing under load. Mounting: treat the outer ring as the floating element; keep the inner ring with its three flanges square on the shaft and relubricate through the outer-ring groove. A 80 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "offshore crane sheaves", "heavy material-handling rope pulleys", "rolling-mill and caster drives", "large crane and winch drums" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 121/216 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCL4916-CV?", "a": "SKF NNCL 4916 CV is a double-row full-complement cylindrical roller bearing with 80 mm bore, 110 mm OD and 30 mm width per ISO 15. SKF lists C 121 kN, C0 216 kN, Pu 25 kN, reference speed 2,600 r/min and limiting speed 3,400 r/min, mass about 850 g." }, { "q": "What does the NNCL designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set." }, { "q": "Can NNCL4916-CV take axial load and locate the shaft?", "a": "No — the smooth outer ring floats, making NNCL the non-locating member of the arrangement." }, { "q": "How does NNCL4916-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4916-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 80×110×30 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCF4916-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 80×110×30 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCL4916-CV", "SKF NNCL 4916 CV" ], "locale_variants": {} }, { "sku": "NNCL4918-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCL 4918 CV", "series": "NNCL4900-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 125, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 161, "static_load_kN": 300, "fatigue_load_limit_kN": 35.5, "max_rpm": 3000, "reference_speed_rpm": 2400, "limiting_speed_rpm": 3000, "weight_g": 1300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NNCL4918-CV is the 90 mm bore entry in the NNCL4900 range: a 90×125×35 mm double-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 161 kN / C0 300 kN. Structurally, the NNCL design has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set. In arrangement terms it is non-locating: the outer ring can be displaced axially, like an NN design, to absorb shaft expansion. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 90 mm seat is about 1.79 kN/mm, typical of dimension series 49 (compact heavy section); use C0 300 kN for static checks such as crane hook blocks standing under load. Mounting: treat the outer ring as the floating element; keep the inner ring with its three flanges square on the shaft and relubricate through the outer-ring groove. A 90 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "large crane and winch drums", "offshore crane sheaves", "heavy material-handling rope pulleys", "rolling-mill and caster drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 125 mm raceway.", "The 161/300 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCL4918-CV?", "a": "SKF NNCL 4918 CV is a double-row full-complement cylindrical roller bearing with 90 mm bore, 125 mm OD and 35 mm width per ISO 15. SKF lists C 161 kN, C0 300 kN, Pu 35.5 kN, reference speed 2,400 r/min and limiting speed 3,000 r/min, mass about 1300 g." }, { "q": "What does the NNCL designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set." }, { "q": "Can NNCL4918-CV take axial load and locate the shaft?", "a": "No — the smooth outer ring floats, making NNCL the non-locating member of the arrangement." }, { "q": "How does NNCL4918-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4918-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 90×125×35 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCF4918-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 90×125×35 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCL4918-CV", "SKF NNCL 4918 CV" ], "locale_variants": {} }, { "sku": "NNCL4920-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCL 4920 CV", "series": "NNCL4900-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 140, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 209, "static_load_kN": 400, "fatigue_load_limit_kN": 46.5, "max_rpm": 2600, "reference_speed_rpm": 2000, "limiting_speed_rpm": 2600, "weight_g": 1900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NNCL 4920 CV denotes a double-row full-complement cylindrical roller bearing on the ISO 15 100×140×40 mm envelope, dimension series 49 (compact heavy section), with catalogue mass 1900 g. Reading the NNCL prefix: a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set. This makes the execution non-locating: the outer ring can be displaced axially, like an NN design, to absorb shaft expansion. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. With C 209 kN and C0 400 kN, size the bearing on the 100×140 mm ISO 15 envelope and check the 46.5 kN Pu against the equivalent-load floor; the catalogue lists 2,000 r/min thermal reference speed and 2,600 r/min mechanical limiting speed. Mounting: treat the outer ring as the floating element; keep the inner ring with its three flanges square on the shaft and relubricate through the outer-ring groove. A 100 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "offshore crane sheaves", "heavy material-handling rope pulleys", "rolling-mill and caster drives", "large crane and winch drums" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 40 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 40 mm-wide ring and concentrates load.", "The 209/400 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCL4920-CV?", "a": "SKF NNCL 4920 CV is a double-row full-complement cylindrical roller bearing with 100 mm bore, 140 mm OD and 40 mm width per ISO 15. SKF lists C 209 kN, C0 400 kN, Pu 46.5 kN, reference speed 2,000 r/min and limiting speed 2,600 r/min, mass about 1900 g." }, { "q": "What does the NNCL designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set." }, { "q": "Can NNCL4920-CV take axial load and locate the shaft?", "a": "No — the smooth outer ring floats, making NNCL the non-locating member of the arrangement." }, { "q": "How does NNCL4920-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4920-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 100×140×40 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCF4920-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 100×140×40 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCL4920-CV", "SKF NNCL 4920 CV" ], "locale_variants": {} }, { "sku": "NNCL4922-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCL 4922 CV", "series": "NNCL4900-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 150, "B_mm": 40, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 220, "static_load_kN": 430, "fatigue_load_limit_kN": 49, "max_rpm": 2400, "reference_speed_rpm": 1900, "limiting_speed_rpm": 2400, "weight_g": 2100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NNCL4922-CV is the 110 mm bore entry in the NNCL4900 range: a 110×150×40 mm double-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 220 kN / C0 430 kN. Reading the NNCL prefix: a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set. This makes the execution non-locating: the outer ring can be displaced axially, like an NN design, to absorb shaft expansion. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. With C 220 kN and C0 430 kN, size the bearing on the 110×150 mm ISO 15 envelope and check the 49 kN Pu against the equivalent-load floor; the catalogue lists 1,900 r/min thermal reference speed and 2,400 r/min mechanical limiting speed. Mounting: treat the outer ring as the floating element; keep the inner ring with its three flanges square on the shaft and relubricate through the outer-ring groove. A 110 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "large crane and winch drums", "offshore crane sheaves", "heavy material-handling rope pulleys", "rolling-mill and caster drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 40 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 220/430 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCL4922-CV?", "a": "SKF NNCL 4922 CV is a double-row full-complement cylindrical roller bearing with 110 mm bore, 150 mm OD and 40 mm width per ISO 15. SKF lists C 220 kN, C0 430 kN, Pu 49 kN, reference speed 1,900 r/min and limiting speed 2,400 r/min, mass about 2100 g." }, { "q": "What does the NNCL designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set." }, { "q": "Can NNCL4922-CV take axial load and locate the shaft?", "a": "No — the smooth outer ring floats, making NNCL the non-locating member of the arrangement." }, { "q": "How does NNCL4922-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4922-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 110×150×40 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCF4922-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 110×150×40 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCL4922-CV", "SKF NNCL 4922 CV" ], "locale_variants": {} }, { "sku": "NNCL4924-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCL 4924 CV", "series": "NNCL4900-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 165, "B_mm": 45, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 242, "static_load_kN": 480, "fatigue_load_limit_kN": 53, "max_rpm": 2200, "reference_speed_rpm": 1700, "limiting_speed_rpm": 2200, "weight_g": 2850, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NNCL 4924 CV is a double-row full-complement cylindrical roller bearing sized 120×165×45 mm — a dimension series 49 (compact heavy section), listed in SKF catalogue PUB BU/P1 17000 ch. 6.4. The NNCL configuration means a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set; functionally the bearing is non-locating: the outer ring can be displaced axially, like an NN design, to absorb shaft expansion. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 1.98 (480 against 242 kN), and the Pu figure 53 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 1,700 r/min thermal reference speed and 2,200 r/min mechanical limiting speed. Assembly note: treat the outer ring as the floating element; keep the inner ring with its three flanges square on the shaft and relubricate through the outer-ring groove. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks", "mining shovel and dragline pivots" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 165 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 45 mm-wide ring and concentrates load.", "The 242/480 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCL4924-CV?", "a": "SKF NNCL 4924 CV is a double-row full-complement cylindrical roller bearing with 120 mm bore, 165 mm OD and 45 mm width per ISO 15. SKF lists C 242 kN, C0 480 kN, Pu 53 kN, reference speed 1,700 r/min and limiting speed 2,200 r/min, mass about 2850 g." }, { "q": "What does the NNCL designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set." }, { "q": "Can NNCL4924-CV take axial load and locate the shaft?", "a": "No — the smooth outer ring floats, making NNCL the non-locating member of the arrangement." }, { "q": "How does NNCL4924-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4924-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 120×165×45 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCF4924-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 120×165×45 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCL4924-CV", "SKF NNCL 4924 CV" ], "locale_variants": {} }, { "sku": "NNCL4926-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCL 4926 CV", "series": "NNCL4900-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 180, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 297, "static_load_kN": 530, "fatigue_load_limit_kN": 60, "max_rpm": 2000, "reference_speed_rpm": 1600, "limiting_speed_rpm": 2000, "weight_g": 3800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NNCL 4926 CV resolves to a 130×180×50 mm double-row full-complement cylindrical roller bearing (dimension series 49 (compact heavy section)); a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set. The NNCL configuration means a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set; functionally the bearing is non-locating: the outer ring can be displaced axially, like an NN design, to absorb shaft expansion. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 1.78 (530 against 297 kN), and the Pu figure 60 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 1,600 r/min thermal reference speed and 2,000 r/min mechanical limiting speed. Assembly note: treat the outer ring as the floating element; keep the inner ring with its three flanges square on the shaft and relubricate through the outer-ring groove. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 180 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 297/530 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCL4926-CV?", "a": "SKF NNCL 4926 CV is a double-row full-complement cylindrical roller bearing with 130 mm bore, 180 mm OD and 50 mm width per ISO 15. SKF lists C 297 kN, C0 530 kN, Pu 60 kN, reference speed 1,600 r/min and limiting speed 2,000 r/min, mass about 3800 g." }, { "q": "What does the NNCL designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set." }, { "q": "Can NNCL4926-CV take axial load and locate the shaft?", "a": "No — the smooth outer ring floats, making NNCL the non-locating member of the arrangement." }, { "q": "How does NNCL4926-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4926-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 130×180×50 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCF4926-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 130×180×50 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCL4926-CV", "SKF NNCL 4926 CV" ], "locale_variants": {} }, { "sku": "NNCL4928-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCL 4928 CV", "series": "NNCL4900-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 190, "B_mm": 50, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 308, "static_load_kN": 570, "fatigue_load_limit_kN": 63, "max_rpm": 1900, "reference_speed_rpm": 1500, "limiting_speed_rpm": 1900, "weight_g": 4100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 140 mm shaft, SKF lists NNCL4928-CV as double-row full-complement cylindrical roller: 190 mm OD, 50 mm wide, Pu 63 kN, the catalogue lists 1,500 r/min thermal reference speed and 1,900 r/min mechanical limiting speed. The NNCL configuration means a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set; functionally the bearing is non-locating: the outer ring can be displaced axially, like an NN design, to absorb shaft expansion. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 1.85 (570 against 308 kN), and the Pu figure 63 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 1,500 r/min thermal reference speed and 1,900 r/min mechanical limiting speed. Assembly note: treat the outer ring as the floating element; keep the inner ring with its three flanges square on the shaft and relubricate through the outer-ring groove. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "large offshore winch and hook blocks", "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 190 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 190 mm raceway.", "The 308/570 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCL4928-CV?", "a": "SKF NNCL 4928 CV is a double-row full-complement cylindrical roller bearing with 140 mm bore, 190 mm OD and 50 mm width per ISO 15. SKF lists C 308 kN, C0 570 kN, Pu 63 kN, reference speed 1,500 r/min and limiting speed 1,900 r/min, mass about 4100 g." }, { "q": "What does the NNCL designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set." }, { "q": "Can NNCL4928-CV take axial load and locate the shaft?", "a": "No — the smooth outer ring floats, making NNCL the non-locating member of the arrangement." }, { "q": "How does NNCL4928-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4928-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 140×190×50 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCF4928-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 140×190×50 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCL4928-CV", "SKF NNCL 4928 CV" ], "locale_variants": {} }, { "sku": "NNCL4930-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCL 4930 CV", "series": "NNCL4900-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 210, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 429, "static_load_kN": 830, "fatigue_load_limit_kN": 91.5, "max_rpm": 1700, "reference_speed_rpm": 1400, "limiting_speed_rpm": 1700, "weight_g": 6450, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NNCL 4930 CV denotes a double-row full-complement cylindrical roller bearing on the ISO 15 150×210×60 mm envelope, dimension series 49 (compact heavy section), with catalogue mass 6450 g. Structurally, the NNCL design has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set. In arrangement terms it is non-locating: the outer ring can be displaced axially, like an NN design, to absorb shaft expansion. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Speed planning for NNCL4930-CV: the catalogue lists 1,400 r/min thermal reference speed and 1,700 r/min mechanical limiting speed. The mass entry 6450 g covers the complete catalogue execution. Fit practice for NNCL4930-CV: treat the outer ring as the floating element; keep the inner ring with its three flanges square on the shaft and relubricate through the outer-ring groove. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 60 mm-wide ring and concentrates load.", "The 429/830 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCL4930-CV?", "a": "SKF NNCL 4930 CV is a double-row full-complement cylindrical roller bearing with 150 mm bore, 210 mm OD and 60 mm width per ISO 15. SKF lists C 429 kN, C0 830 kN, Pu 91.5 kN, reference speed 1,400 r/min and limiting speed 1,700 r/min, mass about 6450 g." }, { "q": "What does the NNCL designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set." }, { "q": "Can NNCL4930-CV take axial load and locate the shaft?", "a": "No — the smooth outer ring floats, making NNCL the non-locating member of the arrangement." }, { "q": "How does NNCL4930-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4930-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 150×210×60 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCF4930-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 150×210×60 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCL4930-CV", "SKF NNCL 4930 CV" ], "locale_variants": {} }, { "sku": "NNCL4932-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCL 4932 CV", "series": "NNCL4900-series", "type": "cylindrical_roller", "d_mm": 160, "D_mm": 220, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 446, "static_load_kN": 915, "fatigue_load_limit_kN": 96.5, "max_rpm": 1600, "reference_speed_rpm": 1300, "limiting_speed_rpm": 1600, "weight_g": 6800, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NNCL4932-CV is the 160 mm bore entry in the NNCL4900 range: a 160×220×60 mm double-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 446 kN / C0 915 kN. Structurally, the NNCL design has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set. In arrangement terms it is non-locating: the outer ring can be displaced axially, like an NN design, to absorb shaft expansion. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Speed planning for NNCL4932-CV: the catalogue lists 1,300 r/min thermal reference speed and 1,600 r/min mechanical limiting speed. The mass entry 6800 g covers the complete catalogue execution. Fit practice for NNCL4932-CV: treat the outer ring as the floating element; keep the inner ring with its three flanges square on the shaft and relubricate through the outer-ring groove. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "large offshore winch and hook blocks", "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 446/915 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCL4932-CV?", "a": "SKF NNCL 4932 CV is a double-row full-complement cylindrical roller bearing with 160 mm bore, 220 mm OD and 60 mm width per ISO 15. SKF lists C 446 kN, C0 915 kN, Pu 96.5 kN, reference speed 1,300 r/min and limiting speed 1,600 r/min, mass about 6800 g." }, { "q": "What does the NNCL designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set." }, { "q": "Can NNCL4932-CV take axial load and locate the shaft?", "a": "No — the smooth outer ring floats, making NNCL the non-locating member of the arrangement." }, { "q": "How does NNCL4932-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4932-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 160×220×60 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCF4932-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 160×220×60 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCL4932-CV", "SKF NNCL 4932 CV" ], "locale_variants": {} }, { "sku": "NNCL4934-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCL 4934 CV", "series": "NNCL4900-series", "type": "cylindrical_roller", "d_mm": 170, "D_mm": 230, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 457, "static_load_kN": 950, "fatigue_load_limit_kN": 100, "max_rpm": 1500, "reference_speed_rpm": 1200, "limiting_speed_rpm": 1500, "weight_g": 7100, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NNCL 4934 CV is a double-row full-complement cylindrical roller bearing sized 170×230×60 mm — a dimension series 49 (compact heavy section), listed in SKF catalogue PUB BU/P1 17000 ch. 6.4. Structurally, the NNCL design has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set. In arrangement terms it is non-locating: the outer ring can be displaced axially, like an NN design, to absorb shaft expansion. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. With C 457 kN and C0 950 kN, size the bearing on the 170×230 mm ISO 15 envelope and check the 100 kN Pu against the equivalent-load floor; the catalogue lists 1,200 r/min thermal reference speed and 1,500 r/min mechanical limiting speed. Mounting: treat the outer ring as the floating element; keep the inner ring with its three flanges square on the shaft and relubricate through the outer-ring groove. A 170 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 60 mm-wide ring and concentrates load.", "The 457/950 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCL4934-CV?", "a": "SKF NNCL 4934 CV is a double-row full-complement cylindrical roller bearing with 170 mm bore, 230 mm OD and 60 mm width per ISO 15. SKF lists C 457 kN, C0 950 kN, Pu 100 kN, reference speed 1,200 r/min and limiting speed 1,500 r/min, mass about 7100 g." }, { "q": "What does the NNCL designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set." }, { "q": "Can NNCL4934-CV take axial load and locate the shaft?", "a": "No — the smooth outer ring floats, making NNCL the non-locating member of the arrangement." }, { "q": "How does NNCL4934-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4934-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 170×230×60 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCF4934-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 170×230×60 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCL4934-CV", "SKF NNCL 4934 CV" ], "locale_variants": {} }, { "sku": "NNCL4936-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCL 4936 CV", "series": "NNCL4900-series", "type": "cylindrical_roller", "d_mm": 180, "D_mm": 250, "B_mm": 69, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 594, "static_load_kN": 1220, "fatigue_load_limit_kN": 127, "max_rpm": 1400, "reference_speed_rpm": 1100, "limiting_speed_rpm": 1400, "weight_g": 10500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NNCL 4936 CV resolves to a 180×250×69 mm double-row full-complement cylindrical roller bearing (dimension series 49 (compact heavy section)); a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set. Structurally, the NNCL design has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set. In arrangement terms it is non-locating: the outer ring can be displaced axially, like an NN design, to absorb shaft expansion. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. With C 594 kN and C0 1220 kN, size the bearing on the 180×250 mm ISO 15 envelope and check the 127 kN Pu against the equivalent-load floor; the catalogue lists 1,100 r/min thermal reference speed and 1,400 r/min mechanical limiting speed. Mounting: treat the outer ring as the floating element; keep the inner ring with its three flanges square on the shaft and relubricate through the outer-ring groove. A 180 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "large offshore winch and hook blocks", "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 594/1220 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCL4936-CV?", "a": "SKF NNCL 4936 CV is a double-row full-complement cylindrical roller bearing with 180 mm bore, 250 mm OD and 69 mm width per ISO 15. SKF lists C 594 kN, C0 1220 kN, Pu 127 kN, reference speed 1,100 r/min and limiting speed 1,400 r/min, mass about 10500 g." }, { "q": "What does the NNCL designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set." }, { "q": "Can NNCL4936-CV take axial load and locate the shaft?", "a": "No — the smooth outer ring floats, making NNCL the non-locating member of the arrangement." }, { "q": "How does NNCL4936-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4936-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 180×250×69 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCF4936-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 180×250×69 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCL4936-CV", "SKF NNCL 4936 CV" ], "locale_variants": {} }, { "sku": "NNCL4938-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCL 4938 CV", "series": "NNCL4900-series", "type": "cylindrical_roller", "d_mm": 190, "D_mm": 260, "B_mm": 69, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 605, "static_load_kN": 1290, "fatigue_load_limit_kN": 132, "max_rpm": 1400, "reference_speed_rpm": 1100, "limiting_speed_rpm": 1400, "weight_g": 11000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 190 mm shaft, SKF lists NNCL4938-CV as double-row full-complement cylindrical roller: 260 mm OD, 69 mm wide, Pu 132 kN, the catalogue lists 1,100 r/min thermal reference speed and 1,400 r/min mechanical limiting speed. Reading the NNCL prefix: a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set. This makes the execution non-locating: the outer ring can be displaced axially, like an NN design, to absorb shaft expansion. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The radial section height is 35.0 mm and the catalogue mass 11000 g; at 605 kN dynamic rating this is roughly 3.18 kN of C per millimetre of bore before application factors. Mounting: treat the outer ring as the floating element; keep the inner ring with its three flanges square on the shaft and relubricate through the outer-ring groove. A 190 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 69 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 260 mm raceway.", "The 605/1290 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCL4938-CV?", "a": "SKF NNCL 4938 CV is a double-row full-complement cylindrical roller bearing with 190 mm bore, 260 mm OD and 69 mm width per ISO 15. SKF lists C 605 kN, C0 1290 kN, Pu 132 kN, reference speed 1,100 r/min and limiting speed 1,400 r/min, mass about 11000 g." }, { "q": "What does the NNCL designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set." }, { "q": "Can NNCL4938-CV take axial load and locate the shaft?", "a": "No — the smooth outer ring floats, making NNCL the non-locating member of the arrangement." }, { "q": "How does NNCL4938-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4938-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 190×260×69 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCF4938-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 190×260×69 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCL4938-CV", "SKF NNCL 4938 CV" ], "locale_variants": {} }, { "sku": "NNCL4940-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCL 4940 CV", "series": "NNCL4900-series", "type": "cylindrical_roller", "d_mm": 200, "D_mm": 280, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 704, "static_load_kN": 1500, "fatigue_load_limit_kN": 153, "max_rpm": 1300, "reference_speed_rpm": 1000, "limiting_speed_rpm": 1300, "weight_g": 15500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NNCL 4940 CV resolves to a 200×280×80 mm double-row full-complement cylindrical roller bearing (dimension series 49 (compact heavy section)); a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set. The NNCL configuration means a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set; functionally the bearing is non-locating: the outer ring can be displaced axially, like an NN design, to absorb shaft expansion. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Load-per-bore for the 200 mm seat is about 3.52 kN/mm, typical of dimension series 49 (compact heavy section); use C0 1500 kN for static checks such as crane hook blocks standing under load. Mounting: treat the outer ring as the floating element; keep the inner ring with its three flanges square on the shaft and relubricate through the outer-ring groove. A 200 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks", "mining shovel and dragline pivots" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 280 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 80 mm-wide ring and concentrates load.", "The 704/1500 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCL4940-CV?", "a": "SKF NNCL 4940 CV is a double-row full-complement cylindrical roller bearing with 200 mm bore, 280 mm OD and 80 mm width per ISO 15. SKF lists C 704 kN, C0 1500 kN, Pu 153 kN, reference speed 1,000 r/min and limiting speed 1,300 r/min, mass about 15500 g." }, { "q": "What does the NNCL designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set." }, { "q": "Can NNCL4940-CV take axial load and locate the shaft?", "a": "No — the smooth outer ring floats, making NNCL the non-locating member of the arrangement." }, { "q": "How does NNCL4940-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4940-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 200×280×80 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCF4940-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 200×280×80 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCL4940-CV", "SKF NNCL 4940 CV" ], "locale_variants": {} }, { "sku": "NNCL4944-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCL 4944 CV", "series": "NNCL4900-series", "type": "cylindrical_roller", "d_mm": 220, "D_mm": 300, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 737, "static_load_kN": 1600, "fatigue_load_limit_kN": 160, "max_rpm": 1200, "reference_speed_rpm": 950, "limiting_speed_rpm": 1200, "weight_g": 17000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NNCL 4944 CV denotes a double-row full-complement cylindrical roller bearing on the ISO 15 220×300×80 mm envelope, dimension series 49 (compact heavy section), with catalogue mass 17000 g. The NNCL configuration means a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set; functionally the bearing is non-locating: the outer ring can be displaced axially, like an NN design, to absorb shaft expansion. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Speed planning for NNCL4944-CV: the catalogue lists 950 r/min thermal reference speed and 1,200 r/min mechanical limiting speed. The mass entry 17000 g covers the complete catalogue execution. Assembly note: treat the outer ring as the floating element; keep the inner ring with its three flanges square on the shaft and relubricate through the outer-ring groove. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks", "mining shovel and dragline pivots" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 300 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 80 mm-wide ring and concentrates load.", "The 737/1600 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCL4944-CV?", "a": "SKF NNCL 4944 CV is a double-row full-complement cylindrical roller bearing with 220 mm bore, 300 mm OD and 80 mm width per ISO 15. SKF lists C 737 kN, C0 1600 kN, Pu 160 kN, reference speed 950 r/min and limiting speed 1,200 r/min, mass about 17000 g." }, { "q": "What does the NNCL designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set." }, { "q": "Can NNCL4944-CV take axial load and locate the shaft?", "a": "No — the smooth outer ring floats, making NNCL the non-locating member of the arrangement." }, { "q": "How does NNCL4944-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4944-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 220×300×80 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCF4944-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 220×300×80 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCL4944-CV", "SKF NNCL 4944 CV" ], "locale_variants": {} }, { "sku": "NNCL4948-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCL 4948 CV", "series": "NNCL4900-series", "type": "cylindrical_roller", "d_mm": 240, "D_mm": 320, "B_mm": 80, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 781, "static_load_kN": 1760, "fatigue_load_limit_kN": 173, "max_rpm": 1100, "reference_speed_rpm": 850, "limiting_speed_rpm": 1100, "weight_g": 18000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NNCL 4948 CV is a double-row full-complement cylindrical roller bearing sized 240×320×80 mm — a dimension series 49 (compact heavy section), listed in SKF catalogue PUB BU/P1 17000 ch. 6.4. The NNCL configuration means a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set; functionally the bearing is non-locating: the outer ring can be displaced axially, like an NN design, to absorb shaft expansion. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Speed planning for NNCL4948-CV: the catalogue lists 850 r/min thermal reference speed and 1,100 r/min mechanical limiting speed. The mass entry 18000 g covers the complete catalogue execution. Assembly note: treat the outer ring as the floating element; keep the inner ring with its three flanges square on the shaft and relubricate through the outer-ring groove. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "large offshore winch and hook blocks", "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 320 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 320 mm raceway.", "The 781/1760 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCL4948-CV?", "a": "SKF NNCL 4948 CV is a double-row full-complement cylindrical roller bearing with 240 mm bore, 320 mm OD and 80 mm width per ISO 15. SKF lists C 781 kN, C0 1760 kN, Pu 173 kN, reference speed 850 r/min and limiting speed 1,100 r/min, mass about 18000 g." }, { "q": "What does the NNCL designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set." }, { "q": "Can NNCL4948-CV take axial load and locate the shaft?", "a": "No — the smooth outer ring floats, making NNCL the non-locating member of the arrangement." }, { "q": "How does NNCL4948-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4948-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 240×320×80 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCF4948-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 240×320×80 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCL4948-CV", "SKF NNCL 4948 CV" ], "locale_variants": {} }, { "sku": "NNCL4952-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCL 4952 CV", "series": "NNCL4900-series", "type": "cylindrical_roller", "d_mm": 260, "D_mm": 360, "B_mm": 100, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1170, "static_load_kN": 2550, "fatigue_load_limit_kN": 245, "max_rpm": 950, "reference_speed_rpm": 750, "limiting_speed_rpm": 950, "weight_g": 31000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 260 mm shaft, SKF lists NNCL4952-CV as double-row full-complement cylindrical roller: 360 mm OD, 100 mm wide, Pu 245 kN, the catalogue lists 750 r/min thermal reference speed and 950 r/min mechanical limiting speed. Reading the NNCL prefix: a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set. This makes the execution non-locating: the outer ring can be displaced axially, like an NN design, to absorb shaft expansion. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 2.18 (2550 against 1170 kN), and the Pu figure 245 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 750 r/min thermal reference speed and 950 r/min mechanical limiting speed. Fit practice for NNCL4952-CV: treat the outer ring as the floating element; keep the inner ring with its three flanges square on the shaft and relubricate through the outer-ring groove. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks", "mining shovel and dragline pivots" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 100 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 1170/2550 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCL4952-CV?", "a": "SKF NNCL 4952 CV is a double-row full-complement cylindrical roller bearing with 260 mm bore, 360 mm OD and 100 mm width per ISO 15. SKF lists C 1170 kN, C0 2550 kN, Pu 245 kN, reference speed 750 r/min and limiting speed 950 r/min, mass about 31000 g." }, { "q": "What does the NNCL designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set." }, { "q": "Can NNCL4952-CV take axial load and locate the shaft?", "a": "No — the smooth outer ring floats, making NNCL the non-locating member of the arrangement." }, { "q": "How does NNCL4952-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4952-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 260×360×100 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCF4952-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 260×360×100 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCL4952-CV", "SKF NNCL 4952 CV" ], "locale_variants": {} }, { "sku": "NNCL4956-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCL 4956 CV", "series": "NNCL4900-series", "type": "cylindrical_roller", "d_mm": 280, "D_mm": 380, "B_mm": 100, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1210, "static_load_kN": 2700, "fatigue_load_limit_kN": 255, "max_rpm": 900, "reference_speed_rpm": 700, "limiting_speed_rpm": 900, "weight_g": 33000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NNCL4956-CV is the 280 mm bore entry in the NNCL4900 range: a 280×380×100 mm double-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 1210 kN / C0 2700 kN. Reading the NNCL prefix: a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set. This makes the execution non-locating: the outer ring can be displaced axially, like an NN design, to absorb shaft expansion. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Load-per-bore for the 280 mm seat is about 4.32 kN/mm, typical of dimension series 49 (compact heavy section); use C0 2700 kN for static checks such as crane hook blocks standing under load. Mounting: treat the outer ring as the floating element; keep the inner ring with its three flanges square on the shaft and relubricate through the outer-ring groove. A 280 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks", "mining shovel and dragline pivots" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 100 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 1210/2700 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCL4956-CV?", "a": "SKF NNCL 4956 CV is a double-row full-complement cylindrical roller bearing with 280 mm bore, 380 mm OD and 100 mm width per ISO 15. SKF lists C 1210 kN, C0 2700 kN, Pu 255 kN, reference speed 700 r/min and limiting speed 900 r/min, mass about 33000 g." }, { "q": "What does the NNCL designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set." }, { "q": "Can NNCL4956-CV take axial load and locate the shaft?", "a": "No — the smooth outer ring floats, making NNCL the non-locating member of the arrangement." }, { "q": "How does NNCL4956-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4956-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 280×380×100 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCF4956-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 280×380×100 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCL4956-CV", "SKF NNCL 4956 CV" ], "locale_variants": {} }, { "sku": "NNCL4960-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCL 4960 CV", "series": "NNCL4900-series", "type": "cylindrical_roller", "d_mm": 300, "D_mm": 420, "B_mm": 118, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1680, "static_load_kN": 3750, "fatigue_load_limit_kN": 355, "max_rpm": 800, "reference_speed_rpm": 670, "limiting_speed_rpm": 800, "weight_g": 52000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NNCL4960-CV is the 300 mm bore entry in the NNCL4900 range: a 300×420×118 mm double-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 1680 kN / C0 3750 kN. Structurally, the NNCL design has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set. In arrangement terms it is non-locating: the outer ring can be displaced axially, like an NN design, to absorb shaft expansion. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. The radial section height is 60.0 mm and the catalogue mass 52000 g; at 1680 kN dynamic rating this is roughly 5.60 kN of C per millimetre of bore before application factors. Mounting: treat the outer ring as the floating element; keep the inner ring with its three flanges square on the shaft and relubricate through the outer-ring groove. A 300 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 118 mm-wide ring and concentrates load.", "The 1680/3750 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCL4960-CV?", "a": "SKF NNCL 4960 CV is a double-row full-complement cylindrical roller bearing with 300 mm bore, 420 mm OD and 118 mm width per ISO 15. SKF lists C 1680 kN, C0 3750 kN, Pu 355 kN, reference speed 670 r/min and limiting speed 800 r/min, mass about 52000 g." }, { "q": "What does the NNCL designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set." }, { "q": "Can NNCL4960-CV take axial load and locate the shaft?", "a": "No — the smooth outer ring floats, making NNCL the non-locating member of the arrangement." }, { "q": "How does NNCL4960-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4960-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 300×420×118 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCF4960-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 300×420×118 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCL4960-CV", "SKF NNCL 4960 CV" ], "locale_variants": {} }, { "sku": "NNCL4964-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCL 4964 CV", "series": "NNCL4900-series", "type": "cylindrical_roller", "d_mm": 320, "D_mm": 440, "B_mm": 118, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1760, "static_load_kN": 4050, "fatigue_load_limit_kN": 375, "max_rpm": 750, "reference_speed_rpm": 600, "limiting_speed_rpm": 750, "weight_g": 55000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NNCL 4964 CV resolves to a 320×440×118 mm double-row full-complement cylindrical roller bearing (dimension series 49 (compact heavy section)); a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set. Structurally, the NNCL design has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set. In arrangement terms it is non-locating: the outer ring can be displaced axially, like an NN design, to absorb shaft expansion. Reading the order-string suffix CV: the full-complement execution — extra rollers replace the cage, trading speed for maximum radial capacity and stiffness. Selection arithmetic: C0/C ≈ 2.30 (4050 against 1760 kN), and the Pu figure 375 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 600 r/min thermal reference speed and 750 r/min mechanical limiting speed. Assembly note: treat the outer ring as the floating element; keep the inner ring with its three flanges square on the shaft and relubricate through the outer-ring groove. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 118 mm-wide ring and concentrates load.", "The 1760/4050 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCL4964-CV?", "a": "SKF NNCL 4964 CV is a double-row full-complement cylindrical roller bearing with 320 mm bore, 440 mm OD and 118 mm width per ISO 15. SKF lists C 1760 kN, C0 4050 kN, Pu 375 kN, reference speed 600 r/min and limiting speed 750 r/min, mass about 55000 g." }, { "q": "What does the NNCL designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set." }, { "q": "Can NNCL4964-CV take axial load and locate the shaft?", "a": "No — the smooth outer ring floats, making NNCL the non-locating member of the arrangement." }, { "q": "How does NNCL4964-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4964-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 320×440×118 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCF4964-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 320×440×118 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCL4964-CV", "SKF NNCL 4964 CV" ], "locale_variants": {} }, { "sku": "NNCL4968-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCL 4968 CV", "series": "NNCL4900-series", "type": "cylindrical_roller", "d_mm": 340, "D_mm": 460, "B_mm": 118, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1790, "static_load_kN": 4250, "fatigue_load_limit_kN": 390, "max_rpm": 700, "reference_speed_rpm": 560, "limiting_speed_rpm": 700, "weight_g": 58000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NNCL 4968 CV denotes a double-row full-complement cylindrical roller bearing on the ISO 15 340×460×118 mm envelope, dimension series 49 (compact heavy section), with catalogue mass 58000 g. Structurally, the NNCL design has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set. In arrangement terms it is non-locating: the outer ring can be displaced axially, like an NN design, to absorb shaft expansion. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 2.37 (4250 against 1790 kN), and the Pu figure 390 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 560 r/min thermal reference speed and 700 r/min mechanical limiting speed. Assembly note: treat the outer ring as the floating element; keep the inner ring with its three flanges square on the shaft and relubricate through the outer-ring groove. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks", "mining shovel and dragline pivots" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 460 mm raceway.", "The 1790/4250 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCL4968-CV?", "a": "SKF NNCL 4968 CV is a double-row full-complement cylindrical roller bearing with 340 mm bore, 460 mm OD and 118 mm width per ISO 15. SKF lists C 1790 kN, C0 4250 kN, Pu 390 kN, reference speed 560 r/min and limiting speed 700 r/min, mass about 58000 g." }, { "q": "What does the NNCL designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set." }, { "q": "Can NNCL4968-CV take axial load and locate the shaft?", "a": "No — the smooth outer ring floats, making NNCL the non-locating member of the arrangement." }, { "q": "How does NNCL4968-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4968-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 340×460×118 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCF4968-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 340×460×118 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCL4968-CV", "SKF NNCL 4968 CV" ], "locale_variants": {} }, { "sku": "NNCL4972-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCL 4972 CV", "series": "NNCL4900-series", "type": "cylindrical_roller", "d_mm": 360, "D_mm": 480, "B_mm": 118, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1830, "static_load_kN": 4500, "fatigue_load_limit_kN": 405, "max_rpm": 670, "reference_speed_rpm": 530, "limiting_speed_rpm": 670, "weight_g": 61000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NNCL 4972 CV denotes a double-row full-complement cylindrical roller bearing on the ISO 15 360×480×118 mm envelope, dimension series 49 (compact heavy section), with catalogue mass 61000 g. The NNCL configuration means a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set; functionally the bearing is non-locating: the outer ring can be displaced axially, like an NN design, to absorb shaft expansion. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. With C 1830 kN and C0 4500 kN, size the bearing on the 360×480 mm ISO 15 envelope and check the 405 kN Pu against the equivalent-load floor; the catalogue lists 530 r/min thermal reference speed and 670 r/min mechanical limiting speed. Assembly note: treat the outer ring as the floating element; keep the inner ring with its three flanges square on the shaft and relubricate through the outer-ring groove. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 480 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 1830/4500 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCL4972-CV?", "a": "SKF NNCL 4972 CV is a double-row full-complement cylindrical roller bearing with 360 mm bore, 480 mm OD and 118 mm width per ISO 15. SKF lists C 1830 kN, C0 4500 kN, Pu 405 kN, reference speed 530 r/min and limiting speed 670 r/min, mass about 61000 g." }, { "q": "What does the NNCL designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set." }, { "q": "Can NNCL4972-CV take axial load and locate the shaft?", "a": "No — the smooth outer ring floats, making NNCL the non-locating member of the arrangement." }, { "q": "How does NNCL4972-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4972-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 360×480×118 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCF4972-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 360×480×118 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCL4972-CV", "SKF NNCL 4972 CV" ], "locale_variants": {} }, { "sku": "NNCL4976-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCL 4976 CV", "series": "NNCL4900-series", "type": "cylindrical_roller", "d_mm": 380, "D_mm": 520, "B_mm": 140, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 2380, "static_load_kN": 5700, "fatigue_load_limit_kN": 500, "max_rpm": 630, "reference_speed_rpm": 500, "limiting_speed_rpm": 630, "weight_g": 90500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NNCL 4976 CV is a double-row full-complement cylindrical roller bearing sized 380×520×140 mm — a dimension series 49 (compact heavy section), listed in SKF catalogue PUB BU/P1 17000 ch. 6.4. The NNCL configuration means a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set; functionally the bearing is non-locating: the outer ring can be displaced axially, like an NN design, to absorb shaft expansion. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. The radial section height is 70.0 mm and the catalogue mass 90500 g; at 2380 kN dynamic rating this is roughly 6.26 kN of C per millimetre of bore before application factors. Fit practice for NNCL4976-CV: treat the outer ring as the floating element; keep the inner ring with its three flanges square on the shaft and relubricate through the outer-ring groove. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 520 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 2380/5700 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCL4976-CV?", "a": "SKF NNCL 4976 CV is a double-row full-complement cylindrical roller bearing with 380 mm bore, 520 mm OD and 140 mm width per ISO 15. SKF lists C 2380 kN, C0 5700 kN, Pu 500 kN, reference speed 500 r/min and limiting speed 630 r/min, mass about 90500 g." }, { "q": "What does the NNCL designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set." }, { "q": "Can NNCL4976-CV take axial load and locate the shaft?", "a": "No — the smooth outer ring floats, making NNCL the non-locating member of the arrangement." }, { "q": "How does NNCL4976-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4976-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 380×520×140 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCF4976-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 380×520×140 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCL4976-CV", "SKF NNCL 4976 CV" ], "locale_variants": {} }, { "sku": "NNCL4980-CV", "brand": "SKF", "manufacturer_designation": "SKF NNCL 4980 CV", "series": "NNCL4900-series", "type": "cylindrical_roller", "d_mm": 400, "D_mm": 540, "B_mm": 140, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 2420, "static_load_kN": 6000, "fatigue_load_limit_kN": 520, "max_rpm": 600, "reference_speed_rpm": 480, "limiting_speed_rpm": 600, "weight_g": 94500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 400 mm shaft, SKF lists NNCL4980-CV as double-row full-complement cylindrical roller: 540 mm OD, 140 mm wide, Pu 520 kN, the catalogue lists 480 r/min thermal reference speed and 600 r/min mechanical limiting speed. Structurally, the NNCL design has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set. In arrangement terms it is non-locating: the outer ring can be displaced axially, like an NN design, to absorb shaft expansion. Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Load-per-bore for the 400 mm seat is about 6.05 kN/mm, typical of dimension series 49 (compact heavy section); use C0 6000 kN for static checks such as crane hook blocks standing under load. Mounting: treat the outer ring as the floating element; keep the inner ring with its three flanges square on the shaft and relubricate through the outer-ring groove. A 400 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "mining shovel and dragline pivots", "steelmaking and heavy crane sheaves", "large offshore winch and hook blocks" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "roller smearing between the uncaged rollers during slow skidding starts under heavy static load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "uneven row loading from misalignment, concentrating fatigue on one row of the double complement", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "The NNCF/NNCL/NNC triplet shares the envelope and ratings but differs in outer-ring retention — one retaining ring, none, or two; selecting the wrong one changes the axial-locating scheme.", "Relubrication must reach both roller rows through the annular groove; blocked lube holes starve one row silently and show later as asymmetric raceway wear.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 140 mm-wide ring and concentrates load.", "The 2420/6000 kN ratings are SKF catalogue 17000 (2018) values for the CV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNCL4980-CV?", "a": "SKF NNCL 4980 CV is a double-row full-complement cylindrical roller bearing with 400 mm bore, 540 mm OD and 140 mm width per ISO 15. SKF lists C 2420 kN, C0 6000 kN, Pu 520 kN, reference speed 480 r/min and limiting speed 600 r/min, mass about 94500 g." }, { "q": "What does the NNCL designation and CV suffix mean?", "a": "Suffix CV identifies the full-complement execution: the space a cage would occupy is filled with extra rollers, trading speed for maximum radial capacity and stiffness. Structurally this execution has a double-row full complement bearing with three integral flanges on the inner ring and no retaining ring in the smooth outer ring, which is free to pass over the roller set." }, { "q": "Can NNCL4980-CV take axial load and locate the shaft?", "a": "No — the smooth outer ring floats, making NNCL the non-locating member of the arrangement." }, { "q": "How does NNCL4980-CV compare with the other executions in the same envelope?", "a": "NNCF (one outer retaining ring, one-direction guidance), NNCL (no retaining ring, floating outer ring) and NNC (retaining rings both sides, two-direction location) share the ISO envelope and ratings but are not interchangeable in a locating arrangement." }, { "q": "What limits the service life of this bearing most often?", "a": "On full-complement bearings the dominant risks are roller smearing from skidding below minimum load and contamination; maintain minimum radial load, keep lubricant film thick and accelerate gently." } ], "cross_ref": [ { "equiv_sku": "NNC4980-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 400×540×140 mm and equivalent catalogue ratings; the NNC execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NNCF4980-CV", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 400×540×140 mm and equivalent catalogue ratings; the NNCF execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.4 double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNCL4980-CV", "SKF NNCL 4980 CV" ], "locale_variants": {} }, { "sku": "NNF5004-ADB-2LSV", "brand": "SKF", "manufacturer_designation": "SKF NNF 5004 ADB-2LSV", "series": "NNF5000-series", "type": "cylindrical_roller", "d_mm": 20, "D_mm": 42, "B_mm": 30, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 45.7, "static_load_kN": 55, "fatigue_load_limit_kN": 5.7, "max_rpm": 3400, "reference_speed_rpm": 3400, "limiting_speed_rpm": 3400, "weight_g": 200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 20 mm shaft, SKF lists NNF5004-ADB-2LSV as sealed double-row full-complement cylindrical roller: 42 mm OD, 30 mm wide, Pu 5.7 kN, with a sealed limiting speed of 3,400 r/min. Reading the NNF prefix: a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed. This makes the execution a sealed locating unit for very heavy radial loads; the sealed-for-life execution is the classic crane-sheave bearing. The ADB-2LSV suffix denotes nitrile-rubber contact seals (2LS) on both sides with the ADB snap-ring/ring-groove build; the bearing ships grease-filled. The radial section height is 11.0 mm and the catalogue mass 200 g; at 45.7 kN dynamic rating this is roughly 2.29 kN of C per millimetre of bore before application factors. Assembly note: mount as a complete sealed unit — never wash out the factory grease; the seals set the speed ceiling, and relubrication, where specified, goes through the ring grooves. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "small construction-machinery pulleys", "crane sheave and hook blocks without external lubrication supply" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "seal-lip wear and grease loss in dusty crane and construction service after the relubrication interval is exceeded", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "grease degradation inside the sealed unit after long high-temperature periods, invisible until noise rises", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "The sealed NNF unit is packed for life with the correct grease — do not heat it above the seal limit or wash it before mounting; damaged lip seals invalidate the heavy-load duty.", "The B1 width (29 mm inner-assembly width) differs from the overall B 30 mm; check housing and spacer geometry against both values.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 30 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria, though only the limiting speed is published for this sealed unit: observe the mechanical ceiling even when thermal calculations allow more.", "The 45.7/55 kN ratings are SKF catalogue 17000 (2018) values for the ADB-2LSV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNF5004-ADB-2LSV?", "a": "SKF NNF 5004 ADB-2LSV is a sealed double-row full-complement cylindrical roller bearing with 20 mm bore, 42 mm OD and 30 mm width per ISO 15. SKF lists C 45.7 kN, C0 55 kN, Pu 5.7 kN, limiting speed 3,400 r/min (sealed execution), mass about 200 g. Inner-assembly width B1 is 29 mm." }, { "q": "What does the NNF designation and ADB-2LSV suffix mean?", "a": "The ADB-2LSV suffix denotes nitrile-rubber contact seals (2LS) on both sides with the ADB snap-ring/ring-groove build; the bearing ships grease-filled. Structurally this execution has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed." }, { "q": "Can NNF5004-ADB-2LSV take axial load and locate the shaft?", "a": "The sealed NNF unit can guide light axial loads in both directions via the flanged inner ring, but its primary duty is very heavy radial load in sealed positions." }, { "q": "How does NNF5004-ADB-2LSV compare with the other executions in the same envelope?", "a": "The sealed NNF execution shares its envelope with the open NNCF/NNCL/NNC full-complement bearings but is delivered grease-packed with contact seals and a much lower speed ceiling." }, { "q": "Does the sealed NNF bearing need relubrication?", "a": "NNF bearings are delivered grease-packed and sealed for long service; where the design provides relubrication grooves/holes, replenish through them at the prescribed interval. Never wash the bearing out or exceed the seal-limited speed." } ], "cross_ref": [ { "equiv_sku": "NNCF5004-CV", "equiv_brand": "SKF", "level": "partial", "note": "Open full-complement counterpart on the same 20×42×30 mm envelope; this ADB-2LSV row is sealed both sides and grease-packed with a lower limiting speed, and its catalogue ratings differ from the open execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.5 sealed double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNF5004-ADB-2LSV", "SKF NNF 5004 ADB-2LSV" ], "locale_variants": {} }, { "sku": "NNF5005-ADB-2LSV", "brand": "SKF", "manufacturer_designation": "SKF NNF 5005 ADB-2LSV", "series": "NNF5000-series", "type": "cylindrical_roller", "d_mm": 25, "D_mm": 47, "B_mm": 30, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 50.1, "static_load_kN": 65.5, "fatigue_load_limit_kN": 6.8, "max_rpm": 3000, "reference_speed_rpm": 3000, "limiting_speed_rpm": 3000, "weight_g": 240, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NNF5005-ADB-2LSV is the 25 mm bore entry in the NNF5000 range: a 25×47×30 mm sealed double-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 50.1 kN / C0 65.5 kN. Reading the NNF prefix: a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed. This makes the execution a sealed locating unit for very heavy radial loads; the sealed-for-life execution is the classic crane-sheave bearing. The ADB-2LSV suffix denotes nitrile-rubber contact seals (2LS) on both sides with the ADB snap-ring/ring-groove build; the bearing ships grease-filled. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Load-per-bore for the 25 mm seat is about 2.00 kN/mm, typical of dimension series 50 (compact heavy section, wide); use C0 65.5 kN for static checks such as crane hook blocks standing under load. Fit practice for NNF5005-ADB-2LSV: mount as a complete sealed unit — never wash out the factory grease; the seals set the speed ceiling, and relubrication, where specified, goes through the ring grooves. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "small construction-machinery pulleys", "crane sheave and hook blocks without external lubrication supply" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "seal-lip wear and grease loss in dusty crane and construction service after the relubrication interval is exceeded", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "grease degradation inside the sealed unit after long high-temperature periods, invisible until noise rises", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "The sealed NNF unit is packed for life with the correct grease — do not heat it above the seal limit or wash it before mounting; damaged lip seals invalidate the heavy-load duty.", "The B1 width (29 mm inner-assembly width) differs from the overall B 30 mm; check housing and spacer geometry against both values.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 30 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria, though only the limiting speed is published for this sealed unit: observe the mechanical ceiling even when thermal calculations allow more.", "The 50.1/65.5 kN ratings are SKF catalogue 17000 (2018) values for the ADB-2LSV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNF5005-ADB-2LSV?", "a": "SKF NNF 5005 ADB-2LSV is a sealed double-row full-complement cylindrical roller bearing with 25 mm bore, 47 mm OD and 30 mm width per ISO 15. SKF lists C 50.1 kN, C0 65.5 kN, Pu 6.8 kN, limiting speed 3,000 r/min (sealed execution), mass about 240 g. Inner-assembly width B1 is 29 mm." }, { "q": "What does the NNF designation and ADB-2LSV suffix mean?", "a": "The ADB-2LSV suffix denotes nitrile-rubber contact seals (2LS) on both sides with the ADB snap-ring/ring-groove build; the bearing ships grease-filled. Structurally this execution has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed." }, { "q": "Can NNF5005-ADB-2LSV take axial load and locate the shaft?", "a": "The sealed NNF unit can guide light axial loads in both directions via the flanged inner ring, but its primary duty is very heavy radial load in sealed positions." }, { "q": "How does NNF5005-ADB-2LSV compare with the other executions in the same envelope?", "a": "The sealed NNF execution shares its envelope with the open NNCF/NNCL/NNC full-complement bearings but is delivered grease-packed with contact seals and a much lower speed ceiling." }, { "q": "Does the sealed NNF bearing need relubrication?", "a": "NNF bearings are delivered grease-packed and sealed for long service; where the design provides relubrication grooves/holes, replenish through them at the prescribed interval. Never wash the bearing out or exceed the seal-limited speed." } ], "cross_ref": [ { "equiv_sku": "NNCF5005-CV", "equiv_brand": "SKF", "level": "partial", "note": "Open full-complement counterpart on the same 25×47×30 mm envelope; this ADB-2LSV row is sealed both sides and grease-packed with a lower limiting speed, and its catalogue ratings differ from the open execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.5 sealed double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNF5005-ADB-2LSV", "SKF NNF 5005 ADB-2LSV" ], "locale_variants": {} }, { "sku": "NNF5006-ADB-2LSV", "brand": "SKF", "manufacturer_designation": "SKF NNF 5006 ADB-2LSV", "series": "NNF5000-series", "type": "cylindrical_roller", "d_mm": 30, "D_mm": 55, "B_mm": 34, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 57.2, "static_load_kN": 75, "fatigue_load_limit_kN": 7.8, "max_rpm": 2600, "reference_speed_rpm": 2600, "limiting_speed_rpm": 2600, "weight_g": 370, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NNF 5006 ADB-2LSV denotes a sealed double-row full-complement cylindrical roller bearing on the ISO 15 30×55×34 mm envelope, dimension series 50 (compact heavy section, wide), with catalogue mass 370 g. Reading the NNF prefix: a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed. This makes the execution a sealed locating unit for very heavy radial loads; the sealed-for-life execution is the classic crane-sheave bearing. The ADB-2LSV suffix denotes nitrile-rubber contact seals (2LS) on both sides with the ADB snap-ring/ring-groove build; the bearing ships grease-filled. With C 57.2 kN and C0 75 kN, size the bearing on the 30×55 mm ISO 15 envelope and check the 7.8 kN Pu against the equivalent-load floor; SKF publishes only a limiting speed of 2,600 r/min for this sealed execution — the seal contact and packed grease, not a thermal reference speed, set the ceiling. Assembly note: mount as a complete sealed unit — never wash out the factory grease; the seals set the speed ceiling, and relubrication, where specified, goes through the ring grooves. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "mobile-crane rope sheaves", "construction and access-machinery pulleys", "conveyor snub pulleys in dirty environments" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "seal-lip wear and grease loss in dusty crane and construction service after the relubrication interval is exceeded", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "grease degradation inside the sealed unit after long high-temperature periods, invisible until noise rises", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "The sealed NNF unit is packed for life with the correct grease — do not heat it above the seal limit or wash it before mounting; damaged lip seals invalidate the heavy-load duty.", "The B1 width (33 mm inner-assembly width) differs from the overall B 34 mm; check housing and spacer geometry against both values.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 34 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria, though only the limiting speed is published for this sealed unit: observe the mechanical ceiling even when thermal calculations allow more.", "The 57.2/75 kN ratings are SKF catalogue 17000 (2018) values for the ADB-2LSV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNF5006-ADB-2LSV?", "a": "SKF NNF 5006 ADB-2LSV is a sealed double-row full-complement cylindrical roller bearing with 30 mm bore, 55 mm OD and 34 mm width per ISO 15. SKF lists C 57.2 kN, C0 75 kN, Pu 7.8 kN, limiting speed 2,600 r/min (sealed execution), mass about 370 g. Inner-assembly width B1 is 33 mm." }, { "q": "What does the NNF designation and ADB-2LSV suffix mean?", "a": "The ADB-2LSV suffix denotes nitrile-rubber contact seals (2LS) on both sides with the ADB snap-ring/ring-groove build; the bearing ships grease-filled. Structurally this execution has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed." }, { "q": "Can NNF5006-ADB-2LSV take axial load and locate the shaft?", "a": "The sealed NNF unit can guide light axial loads in both directions via the flanged inner ring, but its primary duty is very heavy radial load in sealed positions." }, { "q": "How does NNF5006-ADB-2LSV compare with the other executions in the same envelope?", "a": "The sealed NNF execution shares its envelope with the open NNCF/NNCL/NNC full-complement bearings but is delivered grease-packed with contact seals and a much lower speed ceiling." }, { "q": "Does the sealed NNF bearing need relubrication?", "a": "NNF bearings are delivered grease-packed and sealed for long service; where the design provides relubrication grooves/holes, replenish through them at the prescribed interval. Never wash the bearing out or exceed the seal-limited speed." } ], "cross_ref": [ { "equiv_sku": "NNCF5006-CV", "equiv_brand": "SKF", "level": "partial", "note": "Open full-complement counterpart on the same 30×55×34 mm envelope; this ADB-2LSV row is sealed both sides and grease-packed with a lower limiting speed, and its catalogue ratings differ from the open execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.5 sealed double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNF5006-ADB-2LSV", "SKF NNF 5006 ADB-2LSV" ], "locale_variants": {} }, { "sku": "NNF5007-ADB-2LSV", "brand": "SKF", "manufacturer_designation": "SKF NNF 5007 ADB-2LSV", "series": "NNF5000-series", "type": "cylindrical_roller", "d_mm": 35, "D_mm": 62, "B_mm": 36, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 70.4, "static_load_kN": 98, "fatigue_load_limit_kN": 10.6, "max_rpm": 2200, "reference_speed_rpm": 2200, "limiting_speed_rpm": 2200, "weight_g": 480, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NNF 5007 ADB-2LSV is a sealed double-row full-complement cylindrical roller bearing sized 35×62×36 mm — a dimension series 50 (compact heavy section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.5. Reading the NNF prefix: a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed. This makes the execution a sealed locating unit for very heavy radial loads; the sealed-for-life execution is the classic crane-sheave bearing. The ADB-2LSV suffix denotes nitrile-rubber contact seals (2LS) on both sides with the ADB snap-ring/ring-groove build; the bearing ships grease-filled. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 1.39 (98 against 70.4 kN), and the Pu figure 10.6 kN is the fatigue load-limit floor for the SKF life equation; SKF publishes only a limiting speed of 2,200 r/min for this sealed execution — the seal contact and packed grease, not a thermal reference speed, set the ceiling. Fit practice for NNF5007-ADB-2LSV: mount as a complete sealed unit — never wash out the factory grease; the seals set the speed ceiling, and relubrication, where specified, goes through the ring grooves. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "mobile-crane rope sheaves", "construction and access-machinery pulleys", "conveyor snub pulleys in dirty environments" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "seal-lip wear and grease loss in dusty crane and construction service after the relubrication interval is exceeded", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "grease degradation inside the sealed unit after long high-temperature periods, invisible until noise rises", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "The sealed NNF unit is packed for life with the correct grease — do not heat it above the seal limit or wash it before mounting; damaged lip seals invalidate the heavy-load duty.", "The B1 width (35 mm inner-assembly width) differs from the overall B 36 mm; check housing and spacer geometry against both values.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 36 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria, though only the limiting speed is published for this sealed unit: observe the mechanical ceiling even when thermal calculations allow more.", "The 70.4/98 kN ratings are SKF catalogue 17000 (2018) values for the ADB-2LSV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNF5007-ADB-2LSV?", "a": "SKF NNF 5007 ADB-2LSV is a sealed double-row full-complement cylindrical roller bearing with 35 mm bore, 62 mm OD and 36 mm width per ISO 15. SKF lists C 70.4 kN, C0 98 kN, Pu 10.6 kN, limiting speed 2,200 r/min (sealed execution), mass about 480 g. Inner-assembly width B1 is 35 mm." }, { "q": "What does the NNF designation and ADB-2LSV suffix mean?", "a": "The ADB-2LSV suffix denotes nitrile-rubber contact seals (2LS) on both sides with the ADB snap-ring/ring-groove build; the bearing ships grease-filled. Structurally this execution has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed." }, { "q": "Can NNF5007-ADB-2LSV take axial load and locate the shaft?", "a": "The sealed NNF unit can guide light axial loads in both directions via the flanged inner ring, but its primary duty is very heavy radial load in sealed positions." }, { "q": "How does NNF5007-ADB-2LSV compare with the other executions in the same envelope?", "a": "The sealed NNF execution shares its envelope with the open NNCF/NNCL/NNC full-complement bearings but is delivered grease-packed with contact seals and a much lower speed ceiling." }, { "q": "Does the sealed NNF bearing need relubrication?", "a": "NNF bearings are delivered grease-packed and sealed for long service; where the design provides relubrication grooves/holes, replenish through them at the prescribed interval. Never wash the bearing out or exceed the seal-limited speed." } ], "cross_ref": [ { "equiv_sku": "NNCF5007-CV", "equiv_brand": "SKF", "level": "partial", "note": "Open full-complement counterpart on the same 35×62×36 mm envelope; this ADB-2LSV row is sealed both sides and grease-packed with a lower limiting speed, and its catalogue ratings differ from the open execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.5 sealed double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNF5007-ADB-2LSV", "SKF NNF 5007 ADB-2LSV" ], "locale_variants": {} }, { "sku": "NNF5008-ADB-2LSV", "brand": "SKF", "manufacturer_designation": "SKF NNF 5008 ADB-2LSV", "series": "NNF5000-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 68, "B_mm": 38, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 85.8, "static_load_kN": 116, "fatigue_load_limit_kN": 13.2, "max_rpm": 2000, "reference_speed_rpm": 2000, "limiting_speed_rpm": 2000, "weight_g": 560, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 40 mm shaft, SKF lists NNF5008-ADB-2LSV as sealed double-row full-complement cylindrical roller: 68 mm OD, 38 mm wide, Pu 13.2 kN, with a sealed limiting speed of 2,000 r/min. Reading the NNF prefix: a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed. This makes the execution a sealed locating unit for very heavy radial loads; the sealed-for-life execution is the classic crane-sheave bearing. The ADB-2LSV suffix denotes nitrile-rubber contact seals (2LS) on both sides with the ADB snap-ring/ring-groove build; the bearing ships grease-filled. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. With C 85.8 kN and C0 116 kN, size the bearing on the 40×68 mm ISO 15 envelope and check the 13.2 kN Pu against the equivalent-load floor; SKF publishes only a limiting speed of 2,000 r/min for this sealed execution — the seal contact and packed grease, not a thermal reference speed, set the ceiling. Assembly note: mount as a complete sealed unit — never wash out the factory grease; the seals set the speed ceiling, and relubrication, where specified, goes through the ring grooves. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "conveyor snub pulleys in dirty environments", "mobile-crane rope sheaves", "construction and access-machinery pulleys" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "seal-lip wear and grease loss in dusty crane and construction service after the relubrication interval is exceeded", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "grease degradation inside the sealed unit after long high-temperature periods, invisible until noise rises", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "The sealed NNF unit is packed for life with the correct grease — do not heat it above the seal limit or wash it before mounting; damaged lip seals invalidate the heavy-load duty.", "The B1 width (37 mm inner-assembly width) differs from the overall B 38 mm; check housing and spacer geometry against both values.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 38 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 68 mm raceway.", "The 85.8/116 kN ratings are SKF catalogue 17000 (2018) values for the ADB-2LSV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNF5008-ADB-2LSV?", "a": "SKF NNF 5008 ADB-2LSV is a sealed double-row full-complement cylindrical roller bearing with 40 mm bore, 68 mm OD and 38 mm width per ISO 15. SKF lists C 85.8 kN, C0 116 kN, Pu 13.2 kN, limiting speed 2,000 r/min (sealed execution), mass about 560 g. Inner-assembly width B1 is 37 mm." }, { "q": "What does the NNF designation and ADB-2LSV suffix mean?", "a": "The ADB-2LSV suffix denotes nitrile-rubber contact seals (2LS) on both sides with the ADB snap-ring/ring-groove build; the bearing ships grease-filled. Structurally this execution has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed." }, { "q": "Can NNF5008-ADB-2LSV take axial load and locate the shaft?", "a": "The sealed NNF unit can guide light axial loads in both directions via the flanged inner ring, but its primary duty is very heavy radial load in sealed positions." }, { "q": "How does NNF5008-ADB-2LSV compare with the other executions in the same envelope?", "a": "The sealed NNF execution shares its envelope with the open NNCF/NNCL/NNC full-complement bearings but is delivered grease-packed with contact seals and a much lower speed ceiling." }, { "q": "Does the sealed NNF bearing need relubrication?", "a": "NNF bearings are delivered grease-packed and sealed for long service; where the design provides relubrication grooves/holes, replenish through them at the prescribed interval. Never wash the bearing out or exceed the seal-limited speed." } ], "cross_ref": [ { "equiv_sku": "NNCF5008-CV", "equiv_brand": "SKF", "level": "partial", "note": "Open full-complement counterpart on the same 40×68×38 mm envelope; this ADB-2LSV row is sealed both sides and grease-packed with a lower limiting speed, and its catalogue ratings differ from the open execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.5 sealed double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNF5008-ADB-2LSV", "SKF NNF 5008 ADB-2LSV" ], "locale_variants": {} }, { "sku": "NNF5009-ADB-2LSV", "brand": "SKF", "manufacturer_designation": "SKF NNF 5009 ADB-2LSV", "series": "NNF5000-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 75, "B_mm": 40, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 102, "static_load_kN": 146, "fatigue_load_limit_kN": 17, "max_rpm": 1800, "reference_speed_rpm": 1800, "limiting_speed_rpm": 1800, "weight_g": 700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NNF 5009 ADB-2LSV resolves to a 45×75×40 mm sealed double-row full-complement cylindrical roller bearing (dimension series 50 (compact heavy section, wide)); a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed. Reading the NNF prefix: a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed. This makes the execution a sealed locating unit for very heavy radial loads; the sealed-for-life execution is the classic crane-sheave bearing. The ADB-2LSV suffix denotes nitrile-rubber contact seals (2LS) on both sides with the ADB snap-ring/ring-groove build; the bearing ships grease-filled. Selection arithmetic: C0/C ≈ 1.43 (146 against 102 kN), and the Pu figure 17 kN is the fatigue load-limit floor for the SKF life equation; SKF publishes only a limiting speed of 1,800 r/min for this sealed execution — the seal contact and packed grease, not a thermal reference speed, set the ceiling. Mounting: mount as a complete sealed unit — never wash out the factory grease; the seals set the speed ceiling, and relubrication, where specified, goes through the ring grooves. A 45 mm seat normally takes a k5 interference with an H7 housing bore when the inner ring rotates.", "applications": [ "conveyor snub pulleys in dirty environments", "mobile-crane rope sheaves", "construction and access-machinery pulleys" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "seal-lip wear and grease loss in dusty crane and construction service after the relubrication interval is exceeded", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "grease degradation inside the sealed unit after long high-temperature periods, invisible until noise rises", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "The sealed NNF unit is packed for life with the correct grease — do not heat it above the seal limit or wash it before mounting; damaged lip seals invalidate the heavy-load duty.", "The B1 width (39 mm inner-assembly width) differs from the overall B 40 mm; check housing and spacer geometry against both values.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 40 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 75 mm raceway.", "The 102/146 kN ratings are SKF catalogue 17000 (2018) values for the ADB-2LSV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNF5009-ADB-2LSV?", "a": "SKF NNF 5009 ADB-2LSV is a sealed double-row full-complement cylindrical roller bearing with 45 mm bore, 75 mm OD and 40 mm width per ISO 15. SKF lists C 102 kN, C0 146 kN, Pu 17 kN, limiting speed 1,800 r/min (sealed execution), mass about 700 g. Inner-assembly width B1 is 39 mm." }, { "q": "What does the NNF designation and ADB-2LSV suffix mean?", "a": "The ADB-2LSV suffix denotes nitrile-rubber contact seals (2LS) on both sides with the ADB snap-ring/ring-groove build; the bearing ships grease-filled. Structurally this execution has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed." }, { "q": "Can NNF5009-ADB-2LSV take axial load and locate the shaft?", "a": "The sealed NNF unit can guide light axial loads in both directions via the flanged inner ring, but its primary duty is very heavy radial load in sealed positions." }, { "q": "How does NNF5009-ADB-2LSV compare with the other executions in the same envelope?", "a": "The sealed NNF execution shares its envelope with the open NNCF/NNCL/NNC full-complement bearings but is delivered grease-packed with contact seals and a much lower speed ceiling." }, { "q": "Does the sealed NNF bearing need relubrication?", "a": "NNF bearings are delivered grease-packed and sealed for long service; where the design provides relubrication grooves/holes, replenish through them at the prescribed interval. Never wash the bearing out or exceed the seal-limited speed." } ], "cross_ref": [ { "equiv_sku": "NNCF5009-CV", "equiv_brand": "SKF", "level": "full", "note": "Open full-complement counterpart on the same 45×75×40 mm envelope; this ADB-2LSV row is sealed both sides and grease-packed with a lower limiting speed, and its catalogue ratings match the open execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.5 sealed double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNF5009-ADB-2LSV", "SKF NNF 5009 ADB-2LSV" ], "locale_variants": {} }, { "sku": "NNF5010-ADB-2LSV", "brand": "SKF", "manufacturer_designation": "SKF NNF 5010 ADB-2LSV", "series": "NNF5000-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 80, "B_mm": 40, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 108, "static_load_kN": 160, "fatigue_load_limit_kN": 18.6, "max_rpm": 1700, "reference_speed_rpm": 1700, "limiting_speed_rpm": 1700, "weight_g": 760, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 50 mm shaft, SKF lists NNF5010-ADB-2LSV as sealed double-row full-complement cylindrical roller: 80 mm OD, 40 mm wide, Pu 18.6 kN, with a sealed limiting speed of 1,700 r/min. The NNF configuration means a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed; functionally the bearing is a sealed locating unit for very heavy radial loads; the sealed-for-life execution is the classic crane-sheave bearing. Reading the order-string suffix ADB-2LSV: nitrile-rubber contact seals (2LS) on both sides in the ADB snap-ring/ring-groove build, delivered grease-filled. With C 108 kN and C0 160 kN, size the bearing on the 50×80 mm ISO 15 envelope and check the 18.6 kN Pu against the equivalent-load floor; SKF publishes only a limiting speed of 1,700 r/min for this sealed execution — the seal contact and packed grease, not a thermal reference speed, set the ceiling. Mounting: mount as a complete sealed unit — never wash out the factory grease; the seals set the speed ceiling, and relubrication, where specified, goes through the ring grooves. A 50 mm seat normally takes a k5 interference with an H7 housing bore when the inner ring rotates.", "applications": [ "conveyor snub pulleys in dirty environments", "mobile-crane rope sheaves", "construction and access-machinery pulleys" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "seal-lip wear and grease loss in dusty crane and construction service after the relubrication interval is exceeded", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "grease degradation inside the sealed unit after long high-temperature periods, invisible until noise rises", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "The sealed NNF unit is packed for life with the correct grease — do not heat it above the seal limit or wash it before mounting; damaged lip seals invalidate the heavy-load duty.", "The B1 width (39 mm inner-assembly width) differs from the overall B 40 mm; check housing and spacer geometry against both values.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 80 mm raceway.", "Catalogue reference and limiting speeds are different criteria, though only the limiting speed is published for this sealed unit: observe the mechanical ceiling even when thermal calculations allow more.", "The 108/160 kN ratings are SKF catalogue 17000 (2018) values for the ADB-2LSV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNF5010-ADB-2LSV?", "a": "SKF NNF 5010 ADB-2LSV is a sealed double-row full-complement cylindrical roller bearing with 50 mm bore, 80 mm OD and 40 mm width per ISO 15. SKF lists C 108 kN, C0 160 kN, Pu 18.6 kN, limiting speed 1,700 r/min (sealed execution), mass about 760 g. Inner-assembly width B1 is 39 mm." }, { "q": "What does the NNF designation and ADB-2LSV suffix mean?", "a": "The ADB-2LSV suffix denotes nitrile-rubber contact seals (2LS) on both sides with the ADB snap-ring/ring-groove build; the bearing ships grease-filled. Structurally this execution has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed." }, { "q": "Can NNF5010-ADB-2LSV take axial load and locate the shaft?", "a": "The sealed NNF unit can guide light axial loads in both directions via the flanged inner ring, but its primary duty is very heavy radial load in sealed positions." }, { "q": "How does NNF5010-ADB-2LSV compare with the other executions in the same envelope?", "a": "The sealed NNF execution shares its envelope with the open NNCF/NNCL/NNC full-complement bearings but is delivered grease-packed with contact seals and a much lower speed ceiling." }, { "q": "Does the sealed NNF bearing need relubrication?", "a": "NNF bearings are delivered grease-packed and sealed for long service; where the design provides relubrication grooves/holes, replenish through them at the prescribed interval. Never wash the bearing out or exceed the seal-limited speed." } ], "cross_ref": [ { "equiv_sku": "NNCF5010-CV", "equiv_brand": "SKF", "level": "partial", "note": "Open full-complement counterpart on the same 50×80×40 mm envelope; this ADB-2LSV row is sealed both sides and grease-packed with a lower limiting speed, and its catalogue ratings differ from the open execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.5 sealed double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNF5010-ADB-2LSV", "SKF NNF 5010 ADB-2LSV" ], "locale_variants": {} }, { "sku": "NNF5011-ADB-2LSV", "brand": "SKF", "manufacturer_designation": "SKF NNF 5011 ADB-2LSV", "series": "NNF5000-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 90, "B_mm": 46, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 128, "static_load_kN": 193, "fatigue_load_limit_kN": 22.8, "max_rpm": 1500, "reference_speed_rpm": 1500, "limiting_speed_rpm": 1500, "weight_g": 1200, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NNF5011-ADB-2LSV is the 55 mm bore entry in the NNF5000 range: a 55×90×46 mm sealed double-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 128 kN / C0 193 kN. The NNF configuration means a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed; functionally the bearing is a sealed locating unit for very heavy radial loads; the sealed-for-life execution is the classic crane-sheave bearing. The ADB-2LSV suffix denotes nitrile-rubber contact seals (2LS) on both sides with the ADB snap-ring/ring-groove build; the bearing ships grease-filled. Selection arithmetic: C0/C ≈ 1.51 (193 against 128 kN), and the Pu figure 22.8 kN is the fatigue load-limit floor for the SKF life equation; SKF publishes only a limiting speed of 1,500 r/min for this sealed execution — the seal contact and packed grease, not a thermal reference speed, set the ceiling. Assembly note: mount as a complete sealed unit — never wash out the factory grease; the seals set the speed ceiling, and relubrication, where specified, goes through the ring grooves. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "conveyor snub pulleys in dirty environments", "mobile-crane rope sheaves", "construction and access-machinery pulleys" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "seal-lip wear and grease loss in dusty crane and construction service after the relubrication interval is exceeded", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "grease degradation inside the sealed unit after long high-temperature periods, invisible until noise rises", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "The sealed NNF unit is packed for life with the correct grease — do not heat it above the seal limit or wash it before mounting; damaged lip seals invalidate the heavy-load duty.", "The B1 width (45 mm inner-assembly width) differs from the overall B 46 mm; check housing and spacer geometry against both values.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 90 mm raceway.", "Catalogue reference and limiting speeds are different criteria, though only the limiting speed is published for this sealed unit: observe the mechanical ceiling even when thermal calculations allow more.", "The 128/193 kN ratings are SKF catalogue 17000 (2018) values for the ADB-2LSV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNF5011-ADB-2LSV?", "a": "SKF NNF 5011 ADB-2LSV is a sealed double-row full-complement cylindrical roller bearing with 55 mm bore, 90 mm OD and 46 mm width per ISO 15. SKF lists C 128 kN, C0 193 kN, Pu 22.8 kN, limiting speed 1,500 r/min (sealed execution), mass about 1200 g. Inner-assembly width B1 is 45 mm." }, { "q": "What does the NNF designation and ADB-2LSV suffix mean?", "a": "The ADB-2LSV suffix denotes nitrile-rubber contact seals (2LS) on both sides with the ADB snap-ring/ring-groove build; the bearing ships grease-filled. Structurally this execution has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed." }, { "q": "Can NNF5011-ADB-2LSV take axial load and locate the shaft?", "a": "The sealed NNF unit can guide light axial loads in both directions via the flanged inner ring, but its primary duty is very heavy radial load in sealed positions." }, { "q": "How does NNF5011-ADB-2LSV compare with the other executions in the same envelope?", "a": "The sealed NNF execution shares its envelope with the open NNCF/NNCL/NNC full-complement bearings but is delivered grease-packed with contact seals and a much lower speed ceiling." }, { "q": "Does the sealed NNF bearing need relubrication?", "a": "NNF bearings are delivered grease-packed and sealed for long service; where the design provides relubrication grooves/holes, replenish through them at the prescribed interval. Never wash the bearing out or exceed the seal-limited speed." } ], "cross_ref": [ { "equiv_sku": "NNCF5011-CV", "equiv_brand": "SKF", "level": "partial", "note": "Open full-complement counterpart on the same 55×90×46 mm envelope; this ADB-2LSV row is sealed both sides and grease-packed with a lower limiting speed, and its catalogue ratings differ from the open execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.5 sealed double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNF5011-ADB-2LSV", "SKF NNF 5011 ADB-2LSV" ], "locale_variants": {} }, { "sku": "NNF5012-ADB-2LSV", "brand": "SKF", "manufacturer_designation": "SKF NNF 5012 ADB-2LSV", "series": "NNF5000-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 95, "B_mm": 46, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 134, "static_load_kN": 208, "fatigue_load_limit_kN": 25, "max_rpm": 1400, "reference_speed_rpm": 1400, "limiting_speed_rpm": 1400, "weight_g": 1250, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NNF 5012 ADB-2LSV resolves to a 60×95×46 mm sealed double-row full-complement cylindrical roller bearing (dimension series 50 (compact heavy section, wide)); a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed. The NNF configuration means a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed; functionally the bearing is a sealed locating unit for very heavy radial loads; the sealed-for-life execution is the classic crane-sheave bearing. The ADB-2LSV suffix denotes nitrile-rubber contact seals (2LS) on both sides with the ADB snap-ring/ring-groove build; the bearing ships grease-filled. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Speed planning for NNF5012-ADB-2LSV: SKF publishes only a limiting speed of 1,400 r/min for this sealed execution — the seal contact and packed grease, not a thermal reference speed, set the ceiling. The mass entry 1250 g covers the complete catalogue execution including factory grease fill and both seals. Fit practice for NNF5012-ADB-2LSV: mount as a complete sealed unit — never wash out the factory grease; the seals set the speed ceiling, and relubrication, where specified, goes through the ring grooves. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "bulk-material rope-pulley systems", "heavy harbour and offshore crane sheaves", "steelwork and scrap-yard crane blocks" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "seal-lip wear and grease loss in dusty crane and construction service after the relubrication interval is exceeded", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "grease degradation inside the sealed unit after long high-temperature periods, invisible until noise rises", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "The sealed NNF unit is packed for life with the correct grease — do not heat it above the seal limit or wash it before mounting; damaged lip seals invalidate the heavy-load duty.", "The B1 width (45 mm inner-assembly width) differs from the overall B 46 mm; check housing and spacer geometry against both values.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 95 mm raceway.", "Catalogue reference and limiting speeds are different criteria, though only the limiting speed is published for this sealed unit: observe the mechanical ceiling even when thermal calculations allow more.", "The 134/208 kN ratings are SKF catalogue 17000 (2018) values for the ADB-2LSV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNF5012-ADB-2LSV?", "a": "SKF NNF 5012 ADB-2LSV is a sealed double-row full-complement cylindrical roller bearing with 60 mm bore, 95 mm OD and 46 mm width per ISO 15. SKF lists C 134 kN, C0 208 kN, Pu 25 kN, limiting speed 1,400 r/min (sealed execution), mass about 1250 g. Inner-assembly width B1 is 45 mm." }, { "q": "What does the NNF designation and ADB-2LSV suffix mean?", "a": "The ADB-2LSV suffix denotes nitrile-rubber contact seals (2LS) on both sides with the ADB snap-ring/ring-groove build; the bearing ships grease-filled. Structurally this execution has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed." }, { "q": "Can NNF5012-ADB-2LSV take axial load and locate the shaft?", "a": "The sealed NNF unit can guide light axial loads in both directions via the flanged inner ring, but its primary duty is very heavy radial load in sealed positions." }, { "q": "How does NNF5012-ADB-2LSV compare with the other executions in the same envelope?", "a": "The sealed NNF execution shares its envelope with the open NNCF/NNCL/NNC full-complement bearings but is delivered grease-packed with contact seals and a much lower speed ceiling." }, { "q": "Does the sealed NNF bearing need relubrication?", "a": "NNF bearings are delivered grease-packed and sealed for long service; where the design provides relubrication grooves/holes, replenish through them at the prescribed interval. Never wash the bearing out or exceed the seal-limited speed." } ], "cross_ref": [ { "equiv_sku": "NNCF5012-CV", "equiv_brand": "SKF", "level": "partial", "note": "Open full-complement counterpart on the same 60×95×46 mm envelope; this ADB-2LSV row is sealed both sides and grease-packed with a lower limiting speed, and its catalogue ratings differ from the open execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.5 sealed double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNF5012-ADB-2LSV", "SKF NNF 5012 ADB-2LSV" ], "locale_variants": {} }, { "sku": "NNF5013-ADB-2LSV", "brand": "SKF", "manufacturer_designation": "SKF NNF 5013 ADB-2LSV", "series": "NNF5000-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 100, "B_mm": 46, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 138, "static_load_kN": 224, "fatigue_load_limit_kN": 26.5, "max_rpm": 1300, "reference_speed_rpm": 1300, "limiting_speed_rpm": 1300, "weight_g": 1350, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NNF 5013 ADB-2LSV is a sealed double-row full-complement cylindrical roller bearing sized 65×100×46 mm — a dimension series 50 (compact heavy section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.5. The NNF configuration means a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed; functionally the bearing is a sealed locating unit for very heavy radial loads; the sealed-for-life execution is the classic crane-sheave bearing. The ADB-2LSV suffix denotes nitrile-rubber contact seals (2LS) on both sides with the ADB snap-ring/ring-groove build; the bearing ships grease-filled. The radial section height is 17.5 mm and the catalogue mass 1350 g; at 138 kN dynamic rating this is roughly 2.12 kN of C per millimetre of bore before application factors. Assembly note: mount as a complete sealed unit — never wash out the factory grease; the seals set the speed ceiling, and relubrication, where specified, goes through the ring grooves. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "bulk-material rope-pulley systems", "heavy harbour and offshore crane sheaves", "steelwork and scrap-yard crane blocks" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "seal-lip wear and grease loss in dusty crane and construction service after the relubrication interval is exceeded", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "grease degradation inside the sealed unit after long high-temperature periods, invisible until noise rises", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "The sealed NNF unit is packed for life with the correct grease — do not heat it above the seal limit or wash it before mounting; damaged lip seals invalidate the heavy-load duty.", "The B1 width (45 mm inner-assembly width) differs from the overall B 46 mm; check housing and spacer geometry against both values.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 100 mm raceway.", "Catalogue reference and limiting speeds are different criteria, though only the limiting speed is published for this sealed unit: observe the mechanical ceiling even when thermal calculations allow more.", "The 138/224 kN ratings are SKF catalogue 17000 (2018) values for the ADB-2LSV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNF5013-ADB-2LSV?", "a": "SKF NNF 5013 ADB-2LSV is a sealed double-row full-complement cylindrical roller bearing with 65 mm bore, 100 mm OD and 46 mm width per ISO 15. SKF lists C 138 kN, C0 224 kN, Pu 26.5 kN, limiting speed 1,300 r/min (sealed execution), mass about 1350 g. Inner-assembly width B1 is 45 mm." }, { "q": "What does the NNF designation and ADB-2LSV suffix mean?", "a": "The ADB-2LSV suffix denotes nitrile-rubber contact seals (2LS) on both sides with the ADB snap-ring/ring-groove build; the bearing ships grease-filled. Structurally this execution has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed." }, { "q": "Can NNF5013-ADB-2LSV take axial load and locate the shaft?", "a": "The sealed NNF unit can guide light axial loads in both directions via the flanged inner ring, but its primary duty is very heavy radial load in sealed positions." }, { "q": "How does NNF5013-ADB-2LSV compare with the other executions in the same envelope?", "a": "The sealed NNF execution shares its envelope with the open NNCF/NNCL/NNC full-complement bearings but is delivered grease-packed with contact seals and a much lower speed ceiling." }, { "q": "Does the sealed NNF bearing need relubrication?", "a": "NNF bearings are delivered grease-packed and sealed for long service; where the design provides relubrication grooves/holes, replenish through them at the prescribed interval. Never wash the bearing out or exceed the seal-limited speed." } ], "cross_ref": [ { "equiv_sku": "NNCF5013-CV", "equiv_brand": "SKF", "level": "partial", "note": "Open full-complement counterpart on the same 65×100×46 mm envelope; this ADB-2LSV row is sealed both sides and grease-packed with a lower limiting speed, and its catalogue ratings differ from the open execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.5 sealed double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNF5013-ADB-2LSV", "SKF NNF 5013 ADB-2LSV" ], "locale_variants": {} }, { "sku": "NNF5014-ADB-2LSV", "brand": "SKF", "manufacturer_designation": "SKF NNF 5014 ADB-2LSV", "series": "NNF5000-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 110, "B_mm": 54, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 187, "static_load_kN": 285, "fatigue_load_limit_kN": 34.5, "max_rpm": 1200, "reference_speed_rpm": 1200, "limiting_speed_rpm": 1200, "weight_g": 1850, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 70 mm shaft, SKF lists NNF5014-ADB-2LSV as sealed double-row full-complement cylindrical roller: 110 mm OD, 54 mm wide, Pu 34.5 kN, with a sealed limiting speed of 1,200 r/min. The NNF configuration means a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed; functionally the bearing is a sealed locating unit for very heavy radial loads; the sealed-for-life execution is the classic crane-sheave bearing. The ADB-2LSV suffix denotes nitrile-rubber contact seals (2LS) on both sides with the ADB snap-ring/ring-groove build; the bearing ships grease-filled. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Load-per-bore for the 70 mm seat is about 2.67 kN/mm, typical of dimension series 50 (compact heavy section, wide); use C0 285 kN for static checks such as crane hook blocks standing under load. Fit practice for NNF5014-ADB-2LSV: mount as a complete sealed unit — never wash out the factory grease; the seals set the speed ceiling, and relubrication, where specified, goes through the ring grooves. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "bulk-material rope-pulley systems", "heavy harbour and offshore crane sheaves", "steelwork and scrap-yard crane blocks" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "seal-lip wear and grease loss in dusty crane and construction service after the relubrication interval is exceeded", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "grease degradation inside the sealed unit after long high-temperature periods, invisible until noise rises", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "The sealed NNF unit is packed for life with the correct grease — do not heat it above the seal limit or wash it before mounting; damaged lip seals invalidate the heavy-load duty.", "The B1 width (53 mm inner-assembly width) differs from the overall B 54 mm; check housing and spacer geometry against both values.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 110 mm raceway.", "Catalogue reference and limiting speeds are different criteria, though only the limiting speed is published for this sealed unit: observe the mechanical ceiling even when thermal calculations allow more.", "The 187/285 kN ratings are SKF catalogue 17000 (2018) values for the ADB-2LSV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNF5014-ADB-2LSV?", "a": "SKF NNF 5014 ADB-2LSV is a sealed double-row full-complement cylindrical roller bearing with 70 mm bore, 110 mm OD and 54 mm width per ISO 15. SKF lists C 187 kN, C0 285 kN, Pu 34.5 kN, limiting speed 1,200 r/min (sealed execution), mass about 1850 g. Inner-assembly width B1 is 53 mm." }, { "q": "What does the NNF designation and ADB-2LSV suffix mean?", "a": "The ADB-2LSV suffix denotes nitrile-rubber contact seals (2LS) on both sides with the ADB snap-ring/ring-groove build; the bearing ships grease-filled. Structurally this execution has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed." }, { "q": "Can NNF5014-ADB-2LSV take axial load and locate the shaft?", "a": "The sealed NNF unit can guide light axial loads in both directions via the flanged inner ring, but its primary duty is very heavy radial load in sealed positions." }, { "q": "How does NNF5014-ADB-2LSV compare with the other executions in the same envelope?", "a": "The sealed NNF execution shares its envelope with the open NNCF/NNCL/NNC full-complement bearings but is delivered grease-packed with contact seals and a much lower speed ceiling." }, { "q": "Does the sealed NNF bearing need relubrication?", "a": "NNF bearings are delivered grease-packed and sealed for long service; where the design provides relubrication grooves/holes, replenish through them at the prescribed interval. Never wash the bearing out or exceed the seal-limited speed." } ], "cross_ref": [ { "equiv_sku": "NNCF5014-CV", "equiv_brand": "SKF", "level": "partial", "note": "Open full-complement counterpart on the same 70×110×54 mm envelope; this ADB-2LSV row is sealed both sides and grease-packed with a lower limiting speed, and its catalogue ratings differ from the open execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.5 sealed double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNF5014-ADB-2LSV", "SKF NNF 5014 ADB-2LSV" ], "locale_variants": {} }, { "sku": "NNF5015-ADB-2LSV", "brand": "SKF", "manufacturer_designation": "SKF NNF 5015 ADB-2LSV", "series": "NNF5000-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 115, "B_mm": 54, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 224, "static_load_kN": 310, "fatigue_load_limit_kN": 40, "max_rpm": 1100, "reference_speed_rpm": 1100, "limiting_speed_rpm": 1100, "weight_g": 1950, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NNF5015-ADB-2LSV is the 75 mm bore entry in the NNF5000 range: a 75×115×54 mm sealed double-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 224 kN / C0 310 kN. The NNF configuration means a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed; functionally the bearing is a sealed locating unit for very heavy radial loads; the sealed-for-life execution is the classic crane-sheave bearing. Reading the order-string suffix ADB-2LSV: nitrile-rubber contact seals (2LS) on both sides in the ADB snap-ring/ring-groove build, delivered grease-filled. With C 224 kN and C0 310 kN, size the bearing on the 75×115 mm ISO 15 envelope and check the 40 kN Pu against the equivalent-load floor; SKF publishes only a limiting speed of 1,100 r/min for this sealed execution — the seal contact and packed grease, not a thermal reference speed, set the ceiling. Mounting: mount as a complete sealed unit — never wash out the factory grease; the seals set the speed ceiling, and relubrication, where specified, goes through the ring grooves. A 75 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "bulk-material rope-pulley systems", "heavy harbour and offshore crane sheaves", "steelwork and scrap-yard crane blocks" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "seal-lip wear and grease loss in dusty crane and construction service after the relubrication interval is exceeded", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "grease degradation inside the sealed unit after long high-temperature periods, invisible until noise rises", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "The sealed NNF unit is packed for life with the correct grease — do not heat it above the seal limit or wash it before mounting; damaged lip seals invalidate the heavy-load duty.", "The B1 width (53 mm inner-assembly width) differs from the overall B 54 mm; check housing and spacer geometry against both values.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 115 mm raceway.", "Catalogue reference and limiting speeds are different criteria, though only the limiting speed is published for this sealed unit: observe the mechanical ceiling even when thermal calculations allow more.", "The 224/310 kN ratings are SKF catalogue 17000 (2018) values for the ADB-2LSV execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNF5015-ADB-2LSV?", "a": "SKF NNF 5015 ADB-2LSV is a sealed double-row full-complement cylindrical roller bearing with 75 mm bore, 115 mm OD and 54 mm width per ISO 15. SKF lists C 224 kN, C0 310 kN, Pu 40 kN, limiting speed 1,100 r/min (sealed execution), mass about 1950 g. Inner-assembly width B1 is 53 mm." }, { "q": "What does the NNF designation and ADB-2LSV suffix mean?", "a": "The ADB-2LSV suffix denotes nitrile-rubber contact seals (2LS) on both sides with the ADB snap-ring/ring-groove build; the bearing ships grease-filled. Structurally this execution has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed." }, { "q": "Can NNF5015-ADB-2LSV take axial load and locate the shaft?", "a": "The sealed NNF unit can guide light axial loads in both directions via the flanged inner ring, but its primary duty is very heavy radial load in sealed positions." }, { "q": "How does NNF5015-ADB-2LSV compare with the other executions in the same envelope?", "a": "The sealed NNF execution shares its envelope with the open NNCF/NNCL/NNC full-complement bearings but is delivered grease-packed with contact seals and a much lower speed ceiling." }, { "q": "Does the sealed NNF bearing need relubrication?", "a": "NNF bearings are delivered grease-packed and sealed for long service; where the design provides relubrication grooves/holes, replenish through them at the prescribed interval. Never wash the bearing out or exceed the seal-limited speed." } ], "cross_ref": [ { "equiv_sku": "NNCF5015-CV", "equiv_brand": "SKF", "level": "partial", "note": "Open full-complement counterpart on the same 75×115×54 mm envelope; this ADB-2LSV row is sealed both sides and grease-packed with a lower limiting speed, and its catalogue ratings differ from the open execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.5 sealed double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNF5015-ADB-2LSV", "SKF NNF 5015 ADB-2LSV" ], "locale_variants": {} }, { "sku": "NNF5016-B-2LS", "brand": "SKF", "manufacturer_designation": "SKF NNF 5016 B-2LS", "series": "NNF5000-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 125, "B_mm": 60, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 251, "static_load_kN": 415, "fatigue_load_limit_kN": 53, "max_rpm": 1000, "reference_speed_rpm": 1000, "limiting_speed_rpm": 1000, "weight_g": 2700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NNF 5016 B-2LS is a sealed double-row full-complement cylindrical roller bearing sized 80×125×60 mm — a dimension series 50 (compact heavy section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.5. The NNF configuration means a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed; functionally the bearing is a sealed locating unit for very heavy radial loads; the sealed-for-life execution is the classic crane-sheave bearing. The B-2LS suffix denotes nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Load-per-bore for the 80 mm seat is about 3.14 kN/mm, typical of dimension series 50 (compact heavy section, wide); use C0 415 kN for static checks such as crane hook blocks standing under load. Fit practice for NNF5016-B-2LS: mount as a complete sealed unit — never wash out the factory grease; the seals set the speed ceiling, and relubrication, where specified, goes through the ring grooves. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "bulk-material rope-pulley systems", "heavy harbour and offshore crane sheaves", "steelwork and scrap-yard crane blocks" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "seal-lip wear and grease loss in dusty crane and construction service after the relubrication interval is exceeded", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "grease degradation inside the sealed unit after long high-temperature periods, invisible until noise rises", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "The sealed NNF unit is packed for life with the correct grease — do not heat it above the seal limit or wash it before mounting; damaged lip seals invalidate the heavy-load duty.", "The B1 width (59 mm inner-assembly width) differs from the overall B 60 mm; check housing and spacer geometry against both values.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 125 mm raceway.", "Catalogue reference and limiting speeds are different criteria, though only the limiting speed is published for this sealed unit: observe the mechanical ceiling even when thermal calculations allow more.", "The 251/415 kN ratings are SKF catalogue 17000 (2018) values for the B-2LS execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNF5016-B-2LS?", "a": "SKF NNF 5016 B-2LS is a sealed double-row full-complement cylindrical roller bearing with 80 mm bore, 125 mm OD and 60 mm width per ISO 15. SKF lists C 251 kN, C0 415 kN, Pu 53 kN, limiting speed 1,000 r/min (sealed execution), mass about 2700 g. Inner-assembly width B1 is 59 mm." }, { "q": "What does the NNF designation and B-2LS suffix mean?", "a": "The B-2LS suffix denotes nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. Structurally this execution has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed." }, { "q": "Can NNF5016-B-2LS take axial load and locate the shaft?", "a": "The sealed NNF unit can guide light axial loads in both directions via the flanged inner ring, but its primary duty is very heavy radial load in sealed positions." }, { "q": "How does NNF5016-B-2LS compare with the other executions in the same envelope?", "a": "The sealed NNF execution shares its envelope with the open NNCF/NNCL/NNC full-complement bearings but is delivered grease-packed with contact seals and a much lower speed ceiling." }, { "q": "Does the sealed NNF bearing need relubrication?", "a": "NNF bearings are delivered grease-packed and sealed for long service; where the design provides relubrication grooves/holes, replenish through them at the prescribed interval. Never wash the bearing out or exceed the seal-limited speed." } ], "cross_ref": [ { "equiv_sku": "NNCF5016-CV", "equiv_brand": "SKF", "level": "partial", "note": "Open full-complement counterpart on the same 80×125×60 mm envelope; this B-2LS row is sealed both sides and grease-packed with a lower limiting speed, and its catalogue ratings differ from the open execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.5 sealed double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNF5016-B-2LS", "SKF NNF 5016 B-2LS" ], "locale_variants": {} }, { "sku": "NNF5017-B-2LS", "brand": "SKF", "manufacturer_designation": "SKF NNF 5017 B-2LS", "series": "NNF5000-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 130, "B_mm": 60, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 270, "static_load_kN": 430, "fatigue_load_limit_kN": 55, "max_rpm": 1000, "reference_speed_rpm": 1000, "limiting_speed_rpm": 1000, "weight_g": 2850, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 85 mm shaft, SKF lists NNF5017-B-2LS as sealed double-row full-complement cylindrical roller: 130 mm OD, 60 mm wide, Pu 55 kN, with a sealed limiting speed of 1,000 r/min. Reading the NNF prefix: a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed. This makes the execution a sealed locating unit for very heavy radial loads; the sealed-for-life execution is the classic crane-sheave bearing. The B-2LS suffix denotes nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. The radial section height is 22.5 mm and the catalogue mass 2850 g; at 270 kN dynamic rating this is roughly 3.18 kN of C per millimetre of bore before application factors. Mounting: mount as a complete sealed unit — never wash out the factory grease; the seals set the speed ceiling, and relubrication, where specified, goes through the ring grooves. A 85 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "steelwork and scrap-yard crane blocks", "bulk-material rope-pulley systems", "heavy harbour and offshore crane sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "seal-lip wear and grease loss in dusty crane and construction service after the relubrication interval is exceeded", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "grease degradation inside the sealed unit after long high-temperature periods, invisible until noise rises", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "The sealed NNF unit is packed for life with the correct grease — do not heat it above the seal limit or wash it before mounting; damaged lip seals invalidate the heavy-load duty.", "The B1 width (59 mm inner-assembly width) differs from the overall B 60 mm; check housing and spacer geometry against both values.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 60 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 60 mm-wide ring and concentrates load.", "The 270/430 kN ratings are SKF catalogue 17000 (2018) values for the B-2LS execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNF5017-B-2LS?", "a": "SKF NNF 5017 B-2LS is a sealed double-row full-complement cylindrical roller bearing with 85 mm bore, 130 mm OD and 60 mm width per ISO 15. SKF lists C 270 kN, C0 430 kN, Pu 55 kN, limiting speed 1,000 r/min (sealed execution), mass about 2850 g. Inner-assembly width B1 is 59 mm." }, { "q": "What does the NNF designation and B-2LS suffix mean?", "a": "The B-2LS suffix denotes nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. Structurally this execution has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed." }, { "q": "Can NNF5017-B-2LS take axial load and locate the shaft?", "a": "The sealed NNF unit can guide light axial loads in both directions via the flanged inner ring, but its primary duty is very heavy radial load in sealed positions." }, { "q": "How does NNF5017-B-2LS compare with the other executions in the same envelope?", "a": "The sealed NNF execution shares its envelope with the open NNCF/NNCL/NNC full-complement bearings but is delivered grease-packed with contact seals and a much lower speed ceiling." }, { "q": "Does the sealed NNF bearing need relubrication?", "a": "NNF bearings are delivered grease-packed and sealed for long service; where the design provides relubrication grooves/holes, replenish through them at the prescribed interval. Never wash the bearing out or exceed the seal-limited speed." } ], "cross_ref": [ { "equiv_sku": "NNCF5017-CV", "equiv_brand": "SKF", "level": "partial", "note": "Open full-complement counterpart on the same 85×130×60 mm envelope; this B-2LS row is sealed both sides and grease-packed with a lower limiting speed, and its catalogue ratings differ from the open execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.5 sealed double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNF5017-B-2LS", "SKF NNF 5017 B-2LS" ], "locale_variants": {} }, { "sku": "NNF5018-B-2LS", "brand": "SKF", "manufacturer_designation": "SKF NNF 5018 B-2LS", "series": "NNF5000-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 140, "B_mm": 67, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 319, "static_load_kN": 550, "fatigue_load_limit_kN": 69.5, "max_rpm": 900, "reference_speed_rpm": 900, "limiting_speed_rpm": 900, "weight_g": 3700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NNF 5018 B-2LS resolves to a 90×140×67 mm sealed double-row full-complement cylindrical roller bearing (dimension series 50 (compact heavy section, wide)); a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed. Reading the NNF prefix: a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed. This makes the execution a sealed locating unit for very heavy radial loads; the sealed-for-life execution is the classic crane-sheave bearing. The B-2LS suffix denotes nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. Speed planning for NNF5018-B-2LS: SKF publishes only a limiting speed of 900 r/min for this sealed execution — the seal contact and packed grease, not a thermal reference speed, set the ceiling. The mass entry 3700 g covers the complete catalogue execution including factory grease fill and both seals. Assembly note: mount as a complete sealed unit — never wash out the factory grease; the seals set the speed ceiling, and relubrication, where specified, goes through the ring grooves. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "heavy harbour and offshore crane sheaves", "steelwork and scrap-yard crane blocks", "bulk-material rope-pulley systems" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "seal-lip wear and grease loss in dusty crane and construction service after the relubrication interval is exceeded", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "grease degradation inside the sealed unit after long high-temperature periods, invisible until noise rises", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "The sealed NNF unit is packed for life with the correct grease — do not heat it above the seal limit or wash it before mounting; damaged lip seals invalidate the heavy-load duty.", "The B1 width (66 mm inner-assembly width) differs from the overall B 67 mm; check housing and spacer geometry against both values.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 67 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria, though only the limiting speed is published for this sealed unit: observe the mechanical ceiling even when thermal calculations allow more.", "The 319/550 kN ratings are SKF catalogue 17000 (2018) values for the B-2LS execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNF5018-B-2LS?", "a": "SKF NNF 5018 B-2LS is a sealed double-row full-complement cylindrical roller bearing with 90 mm bore, 140 mm OD and 67 mm width per ISO 15. SKF lists C 319 kN, C0 550 kN, Pu 69.5 kN, limiting speed 900 r/min (sealed execution), mass about 3700 g. Inner-assembly width B1 is 66 mm." }, { "q": "What does the NNF designation and B-2LS suffix mean?", "a": "The B-2LS suffix denotes nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. Structurally this execution has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed." }, { "q": "Can NNF5018-B-2LS take axial load and locate the shaft?", "a": "The sealed NNF unit can guide light axial loads in both directions via the flanged inner ring, but its primary duty is very heavy radial load in sealed positions." }, { "q": "How does NNF5018-B-2LS compare with the other executions in the same envelope?", "a": "The sealed NNF execution shares its envelope with the open NNCF/NNCL/NNC full-complement bearings but is delivered grease-packed with contact seals and a much lower speed ceiling." }, { "q": "Does the sealed NNF bearing need relubrication?", "a": "NNF bearings are delivered grease-packed and sealed for long service; where the design provides relubrication grooves/holes, replenish through them at the prescribed interval. Never wash the bearing out or exceed the seal-limited speed." } ], "cross_ref": [ { "equiv_sku": "NNCF5018-CV", "equiv_brand": "SKF", "level": "partial", "note": "Open full-complement counterpart on the same 90×140×67 mm envelope; this B-2LS row is sealed both sides and grease-packed with a lower limiting speed, and its catalogue ratings differ from the open execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.5 sealed double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNF5018-B-2LS", "SKF NNF 5018 B-2LS" ], "locale_variants": {} }, { "sku": "NNF5019-B-2LS", "brand": "SKF", "manufacturer_designation": "SKF NNF 5019 B-2LS", "series": "NNF5000-series", "type": "cylindrical_roller", "d_mm": 95, "D_mm": 145, "B_mm": 67, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 330, "static_load_kN": 570, "fatigue_load_limit_kN": 71, "max_rpm": 900, "reference_speed_rpm": 900, "limiting_speed_rpm": 900, "weight_g": 3900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NNF 5019 B-2LS denotes a sealed double-row full-complement cylindrical roller bearing on the ISO 15 95×145×67 mm envelope, dimension series 50 (compact heavy section, wide), with catalogue mass 3900 g. Reading the NNF prefix: a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed. This makes the execution a sealed locating unit for very heavy radial loads; the sealed-for-life execution is the classic crane-sheave bearing. The B-2LS suffix denotes nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 1.73 (570 against 330 kN), and the Pu figure 71 kN is the fatigue load-limit floor for the SKF life equation; SKF publishes only a limiting speed of 900 r/min for this sealed execution — the seal contact and packed grease, not a thermal reference speed, set the ceiling. Assembly note: mount as a complete sealed unit — never wash out the factory grease; the seals set the speed ceiling, and relubrication, where specified, goes through the ring grooves. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "bulk-material rope-pulley systems", "heavy harbour and offshore crane sheaves", "steelwork and scrap-yard crane blocks" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "seal-lip wear and grease loss in dusty crane and construction service after the relubrication interval is exceeded", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "grease degradation inside the sealed unit after long high-temperature periods, invisible until noise rises", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "The sealed NNF unit is packed for life with the correct grease — do not heat it above the seal limit or wash it before mounting; damaged lip seals invalidate the heavy-load duty.", "The B1 width (66 mm inner-assembly width) differs from the overall B 67 mm; check housing and spacer geometry against both values.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 67 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 145 mm raceway.", "The 330/570 kN ratings are SKF catalogue 17000 (2018) values for the B-2LS execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNF5019-B-2LS?", "a": "SKF NNF 5019 B-2LS is a sealed double-row full-complement cylindrical roller bearing with 95 mm bore, 145 mm OD and 67 mm width per ISO 15. SKF lists C 330 kN, C0 570 kN, Pu 71 kN, limiting speed 900 r/min (sealed execution), mass about 3900 g. Inner-assembly width B1 is 66 mm." }, { "q": "What does the NNF designation and B-2LS suffix mean?", "a": "The B-2LS suffix denotes nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. Structurally this execution has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed." }, { "q": "Can NNF5019-B-2LS take axial load and locate the shaft?", "a": "The sealed NNF unit can guide light axial loads in both directions via the flanged inner ring, but its primary duty is very heavy radial load in sealed positions." }, { "q": "How does NNF5019-B-2LS compare with the other executions in the same envelope?", "a": "The sealed NNF execution shares its envelope with the open NNCF/NNCL/NNC full-complement bearings but is delivered grease-packed with contact seals and a much lower speed ceiling." }, { "q": "Does the sealed NNF bearing need relubrication?", "a": "NNF bearings are delivered grease-packed and sealed for long service; where the design provides relubrication grooves/holes, replenish through them at the prescribed interval. Never wash the bearing out or exceed the seal-limited speed." } ], "cross_ref": [ { "equiv_sku": "NNF5019", "equiv_brand": "ISO 15", "level": "verify", "note": "ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.5 sealed double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNF5019-B-2LS", "SKF NNF 5019 B-2LS" ], "locale_variants": {} }, { "sku": "NNF5020-B-2LS", "brand": "SKF", "manufacturer_designation": "SKF NNF 5020 B-2LS", "series": "NNF5000-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 150, "B_mm": 67, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 336, "static_load_kN": 570, "fatigue_load_limit_kN": 68, "max_rpm": 850, "reference_speed_rpm": 850, "limiting_speed_rpm": 850, "weight_g": 3950, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NNF 5020 B-2LS denotes a sealed double-row full-complement cylindrical roller bearing on the ISO 15 100×150×67 mm envelope, dimension series 50 (compact heavy section, wide), with catalogue mass 3950 g. The NNF configuration means a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed; functionally the bearing is a sealed locating unit for very heavy radial loads; the sealed-for-life execution is the classic crane-sheave bearing. The B-2LS suffix denotes nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Load-per-bore for the 100 mm seat is about 3.36 kN/mm, typical of dimension series 50 (compact heavy section, wide); use C0 570 kN for static checks such as crane hook blocks standing under load. Mounting: mount as a complete sealed unit — never wash out the factory grease; the seals set the speed ceiling, and relubrication, where specified, goes through the ring grooves. A 100 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "heavy harbour and offshore crane sheaves", "steelwork and scrap-yard crane blocks", "bulk-material rope-pulley systems" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "seal-lip wear and grease loss in dusty crane and construction service after the relubrication interval is exceeded", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "grease degradation inside the sealed unit after long high-temperature periods, invisible until noise rises", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "The sealed NNF unit is packed for life with the correct grease — do not heat it above the seal limit or wash it before mounting; damaged lip seals invalidate the heavy-load duty.", "The B1 width (66 mm inner-assembly width) differs from the overall B 67 mm; check housing and spacer geometry against both values.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 150 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 67 mm-wide ring and concentrates load.", "The 336/570 kN ratings are SKF catalogue 17000 (2018) values for the B-2LS execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNF5020-B-2LS?", "a": "SKF NNF 5020 B-2LS is a sealed double-row full-complement cylindrical roller bearing with 100 mm bore, 150 mm OD and 67 mm width per ISO 15. SKF lists C 336 kN, C0 570 kN, Pu 68 kN, limiting speed 850 r/min (sealed execution), mass about 3950 g. Inner-assembly width B1 is 66 mm." }, { "q": "What does the NNF designation and B-2LS suffix mean?", "a": "The B-2LS suffix denotes nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. Structurally this execution has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed." }, { "q": "Can NNF5020-B-2LS take axial load and locate the shaft?", "a": "The sealed NNF unit can guide light axial loads in both directions via the flanged inner ring, but its primary duty is very heavy radial load in sealed positions." }, { "q": "How does NNF5020-B-2LS compare with the other executions in the same envelope?", "a": "The sealed NNF execution shares its envelope with the open NNCF/NNCL/NNC full-complement bearings but is delivered grease-packed with contact seals and a much lower speed ceiling." }, { "q": "Does the sealed NNF bearing need relubrication?", "a": "NNF bearings are delivered grease-packed and sealed for long service; where the design provides relubrication grooves/holes, replenish through them at the prescribed interval. Never wash the bearing out or exceed the seal-limited speed." } ], "cross_ref": [ { "equiv_sku": "NNCF5020-CV", "equiv_brand": "SKF", "level": "partial", "note": "Open full-complement counterpart on the same 100×150×67 mm envelope; this B-2LS row is sealed both sides and grease-packed with a lower limiting speed, and its catalogue ratings differ from the open execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.5 sealed double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNF5020-B-2LS", "SKF NNF 5020 B-2LS" ], "locale_variants": {} }, { "sku": "NNF5022-B-2LS", "brand": "SKF", "manufacturer_designation": "SKF NNF 5022 B-2LS", "series": "NNF5000-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 170, "B_mm": 80, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 413, "static_load_kN": 695, "fatigue_load_limit_kN": 81.5, "max_rpm": 750, "reference_speed_rpm": 750, "limiting_speed_rpm": 750, "weight_g": 6450, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NNF5022-B-2LS is the 110 mm bore entry in the NNF5000 range: a 110×170×80 mm sealed double-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 413 kN / C0 695 kN. The NNF configuration means a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed; functionally the bearing is a sealed locating unit for very heavy radial loads; the sealed-for-life execution is the classic crane-sheave bearing. The B-2LS suffix denotes nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. With C 413 kN and C0 695 kN, size the bearing on the 110×170 mm ISO 15 envelope and check the 81.5 kN Pu against the equivalent-load floor; SKF publishes only a limiting speed of 750 r/min for this sealed execution — the seal contact and packed grease, not a thermal reference speed, set the ceiling. Fit practice for NNF5022-B-2LS: mount as a complete sealed unit — never wash out the factory grease; the seals set the speed ceiling, and relubrication, where specified, goes through the ring grooves. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "heavy harbour and offshore crane sheaves", "steelwork and scrap-yard crane blocks", "bulk-material rope-pulley systems" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "seal-lip wear and grease loss in dusty crane and construction service after the relubrication interval is exceeded", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "grease degradation inside the sealed unit after long high-temperature periods, invisible until noise rises", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "The sealed NNF unit is packed for life with the correct grease — do not heat it above the seal limit or wash it before mounting; damaged lip seals invalidate the heavy-load duty.", "The B1 width (79 mm inner-assembly width) differs from the overall B 80 mm; check housing and spacer geometry against both values.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 170 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 80 mm-wide ring and concentrates load.", "The 413/695 kN ratings are SKF catalogue 17000 (2018) values for the B-2LS execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNF5022-B-2LS?", "a": "SKF NNF 5022 B-2LS is a sealed double-row full-complement cylindrical roller bearing with 110 mm bore, 170 mm OD and 80 mm width per ISO 15. SKF lists C 413 kN, C0 695 kN, Pu 81.5 kN, limiting speed 750 r/min (sealed execution), mass about 6450 g. Inner-assembly width B1 is 79 mm." }, { "q": "What does the NNF designation and B-2LS suffix mean?", "a": "The B-2LS suffix denotes nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. Structurally this execution has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed." }, { "q": "Can NNF5022-B-2LS take axial load and locate the shaft?", "a": "The sealed NNF unit can guide light axial loads in both directions via the flanged inner ring, but its primary duty is very heavy radial load in sealed positions." }, { "q": "How does NNF5022-B-2LS compare with the other executions in the same envelope?", "a": "The sealed NNF execution shares its envelope with the open NNCF/NNCL/NNC full-complement bearings but is delivered grease-packed with contact seals and a much lower speed ceiling." }, { "q": "Does the sealed NNF bearing need relubrication?", "a": "NNF bearings are delivered grease-packed and sealed for long service; where the design provides relubrication grooves/holes, replenish through them at the prescribed interval. Never wash the bearing out or exceed the seal-limited speed." } ], "cross_ref": [ { "equiv_sku": "NNCF5022-CV", "equiv_brand": "SKF", "level": "partial", "note": "Open full-complement counterpart on the same 110×170×80 mm envelope; this B-2LS row is sealed both sides and grease-packed with a lower limiting speed, and its catalogue ratings differ from the open execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.5 sealed double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNF5022-B-2LS", "SKF NNF 5022 B-2LS" ], "locale_variants": {} }, { "sku": "NNF5024-B-2LS", "brand": "SKF", "manufacturer_designation": "SKF NNF 5024 B-2LS", "series": "NNF5000-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 180, "B_mm": 80, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 429, "static_load_kN": 750, "fatigue_load_limit_kN": 86.5, "max_rpm": 700, "reference_speed_rpm": 700, "limiting_speed_rpm": 700, "weight_g": 6900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NNF 5024 B-2LS denotes a sealed double-row full-complement cylindrical roller bearing on the ISO 15 120×180×80 mm envelope, dimension series 50 (compact heavy section, wide), with catalogue mass 6900 g. The NNF configuration means a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed; functionally the bearing is a sealed locating unit for very heavy radial loads; the sealed-for-life execution is the classic crane-sheave bearing. Reading the order-string suffix B-2LS: nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. The radial section height is 30.0 mm and the catalogue mass 6900 g; at 429 kN dynamic rating this is roughly 3.58 kN of C per millimetre of bore before application factors. Fit practice for NNF5024-B-2LS: mount as a complete sealed unit — never wash out the factory grease; the seals set the speed ceiling, and relubrication, where specified, goes through the ring grooves. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "heavy dock and shipyard crane systems", "mining dragline and shovel rope sheaves", "large offshore hook blocks and jib sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "seal-lip wear and grease loss in dusty crane and construction service after the relubrication interval is exceeded", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "grease degradation inside the sealed unit after long high-temperature periods, invisible until noise rises", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "The sealed NNF unit is packed for life with the correct grease — do not heat it above the seal limit or wash it before mounting; damaged lip seals invalidate the heavy-load duty.", "The B1 width (79 mm inner-assembly width) differs from the overall B 80 mm; check housing and spacer geometry against both values.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 180 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 180 mm raceway.", "The 429/750 kN ratings are SKF catalogue 17000 (2018) values for the B-2LS execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNF5024-B-2LS?", "a": "SKF NNF 5024 B-2LS is a sealed double-row full-complement cylindrical roller bearing with 120 mm bore, 180 mm OD and 80 mm width per ISO 15. SKF lists C 429 kN, C0 750 kN, Pu 86.5 kN, limiting speed 700 r/min (sealed execution), mass about 6900 g. Inner-assembly width B1 is 79 mm." }, { "q": "What does the NNF designation and B-2LS suffix mean?", "a": "The B-2LS suffix denotes nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. Structurally this execution has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed." }, { "q": "Can NNF5024-B-2LS take axial load and locate the shaft?", "a": "The sealed NNF unit can guide light axial loads in both directions via the flanged inner ring, but its primary duty is very heavy radial load in sealed positions." }, { "q": "How does NNF5024-B-2LS compare with the other executions in the same envelope?", "a": "The sealed NNF execution shares its envelope with the open NNCF/NNCL/NNC full-complement bearings but is delivered grease-packed with contact seals and a much lower speed ceiling." }, { "q": "Does the sealed NNF bearing need relubrication?", "a": "NNF bearings are delivered grease-packed and sealed for long service; where the design provides relubrication grooves/holes, replenish through them at the prescribed interval. Never wash the bearing out or exceed the seal-limited speed." } ], "cross_ref": [ { "equiv_sku": "NNCF5024-CV", "equiv_brand": "SKF", "level": "partial", "note": "Open full-complement counterpart on the same 120×180×80 mm envelope; this B-2LS row is sealed both sides and grease-packed with a lower limiting speed, and its catalogue ratings differ from the open execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.5 sealed double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNF5024-B-2LS", "SKF NNF 5024 B-2LS" ], "locale_variants": {} }, { "sku": "NNF5026-B-2LS", "brand": "SKF", "manufacturer_designation": "SKF NNF 5026 B-2LS", "series": "NNF5000-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 200, "B_mm": 95, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 616, "static_load_kN": 1040, "fatigue_load_limit_kN": 120, "max_rpm": 630, "reference_speed_rpm": 630, "limiting_speed_rpm": 630, "weight_g": 10500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NNF5026-B-2LS is the 130 mm bore entry in the NNF5000 range: a 130×200×95 mm sealed double-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 616 kN / C0 1040 kN. The NNF configuration means a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed; functionally the bearing is a sealed locating unit for very heavy radial loads; the sealed-for-life execution is the classic crane-sheave bearing. The B-2LS suffix denotes nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Load-per-bore for the 130 mm seat is about 4.74 kN/mm, typical of dimension series 50 (compact heavy section, wide); use C0 1040 kN for static checks such as crane hook blocks standing under load. Assembly note: mount as a complete sealed unit — never wash out the factory grease; the seals set the speed ceiling, and relubrication, where specified, goes through the ring grooves. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "heavy dock and shipyard crane systems", "mining dragline and shovel rope sheaves", "large offshore hook blocks and jib sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "seal-lip wear and grease loss in dusty crane and construction service after the relubrication interval is exceeded", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "grease degradation inside the sealed unit after long high-temperature periods, invisible until noise rises", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "The sealed NNF unit is packed for life with the correct grease — do not heat it above the seal limit or wash it before mounting; damaged lip seals invalidate the heavy-load duty.", "The B1 width (94 mm inner-assembly width) differs from the overall B 95 mm; check housing and spacer geometry against both values.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 200 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 200 mm raceway.", "The 616/1040 kN ratings are SKF catalogue 17000 (2018) values for the B-2LS execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNF5026-B-2LS?", "a": "SKF NNF 5026 B-2LS is a sealed double-row full-complement cylindrical roller bearing with 130 mm bore, 200 mm OD and 95 mm width per ISO 15. SKF lists C 616 kN, C0 1040 kN, Pu 120 kN, limiting speed 630 r/min (sealed execution), mass about 10500 g. Inner-assembly width B1 is 94 mm." }, { "q": "What does the NNF designation and B-2LS suffix mean?", "a": "The B-2LS suffix denotes nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. Structurally this execution has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed." }, { "q": "Can NNF5026-B-2LS take axial load and locate the shaft?", "a": "The sealed NNF unit can guide light axial loads in both directions via the flanged inner ring, but its primary duty is very heavy radial load in sealed positions." }, { "q": "How does NNF5026-B-2LS compare with the other executions in the same envelope?", "a": "The sealed NNF execution shares its envelope with the open NNCF/NNCL/NNC full-complement bearings but is delivered grease-packed with contact seals and a much lower speed ceiling." }, { "q": "Does the sealed NNF bearing need relubrication?", "a": "NNF bearings are delivered grease-packed and sealed for long service; where the design provides relubrication grooves/holes, replenish through them at the prescribed interval. Never wash the bearing out or exceed the seal-limited speed." } ], "cross_ref": [ { "equiv_sku": "NNCF5026-CV", "equiv_brand": "SKF", "level": "partial", "note": "Open full-complement counterpart on the same 130×200×95 mm envelope; this B-2LS row is sealed both sides and grease-packed with a lower limiting speed, and its catalogue ratings differ from the open execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.5 sealed double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNF5026-B-2LS", "SKF NNF 5026 B-2LS" ], "locale_variants": {} }, { "sku": "NNF5028-B-2LS", "brand": "SKF", "manufacturer_designation": "SKF NNF 5028 B-2LS", "series": "NNF5000-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 210, "B_mm": 95, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 644, "static_load_kN": 1120, "fatigue_load_limit_kN": 127, "max_rpm": 600, "reference_speed_rpm": 600, "limiting_speed_rpm": 600, "weight_g": 11000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NNF 5028 B-2LS is a sealed double-row full-complement cylindrical roller bearing sized 140×210×95 mm — a dimension series 50 (compact heavy section, wide), listed in SKF catalogue PUB BU/P1 17000 ch. 6.5. The NNF configuration means a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed; functionally the bearing is a sealed locating unit for very heavy radial loads; the sealed-for-life execution is the classic crane-sheave bearing. The B-2LS suffix denotes nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Speed planning for NNF5028-B-2LS: SKF publishes only a limiting speed of 600 r/min for this sealed execution — the seal contact and packed grease, not a thermal reference speed, set the ceiling. The mass entry 11000 g covers the complete catalogue execution including factory grease fill and both seals. Fit practice for NNF5028-B-2LS: mount as a complete sealed unit — never wash out the factory grease; the seals set the speed ceiling, and relubrication, where specified, goes through the ring grooves. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "mining dragline and shovel rope sheaves", "large offshore hook blocks and jib sheaves", "heavy dock and shipyard crane systems" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "seal-lip wear and grease loss in dusty crane and construction service after the relubrication interval is exceeded", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "grease degradation inside the sealed unit after long high-temperature periods, invisible until noise rises", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "The sealed NNF unit is packed for life with the correct grease — do not heat it above the seal limit or wash it before mounting; damaged lip seals invalidate the heavy-load duty.", "The B1 width (94 mm inner-assembly width) differs from the overall B 95 mm; check housing and spacer geometry against both values.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 210 mm raceway.", "Catalogue reference and limiting speeds are different criteria, though only the limiting speed is published for this sealed unit: observe the mechanical ceiling even when thermal calculations allow more.", "The 644/1120 kN ratings are SKF catalogue 17000 (2018) values for the B-2LS execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNF5028-B-2LS?", "a": "SKF NNF 5028 B-2LS is a sealed double-row full-complement cylindrical roller bearing with 140 mm bore, 210 mm OD and 95 mm width per ISO 15. SKF lists C 644 kN, C0 1120 kN, Pu 127 kN, limiting speed 600 r/min (sealed execution), mass about 11000 g. Inner-assembly width B1 is 94 mm." }, { "q": "What does the NNF designation and B-2LS suffix mean?", "a": "The B-2LS suffix denotes nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. Structurally this execution has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed." }, { "q": "Can NNF5028-B-2LS take axial load and locate the shaft?", "a": "The sealed NNF unit can guide light axial loads in both directions via the flanged inner ring, but its primary duty is very heavy radial load in sealed positions." }, { "q": "How does NNF5028-B-2LS compare with the other executions in the same envelope?", "a": "The sealed NNF execution shares its envelope with the open NNCF/NNCL/NNC full-complement bearings but is delivered grease-packed with contact seals and a much lower speed ceiling." }, { "q": "Does the sealed NNF bearing need relubrication?", "a": "NNF bearings are delivered grease-packed and sealed for long service; where the design provides relubrication grooves/holes, replenish through them at the prescribed interval. Never wash the bearing out or exceed the seal-limited speed." } ], "cross_ref": [ { "equiv_sku": "NNCF5028-CV", "equiv_brand": "SKF", "level": "partial", "note": "Open full-complement counterpart on the same 140×210×95 mm envelope; this B-2LS row is sealed both sides and grease-packed with a lower limiting speed, and its catalogue ratings differ from the open execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.5 sealed double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNF5028-B-2LS", "SKF NNF 5028 B-2LS" ], "locale_variants": {} }, { "sku": "NNF5030-B-2LS", "brand": "SKF", "manufacturer_designation": "SKF NNF 5030 B-2LS", "series": "NNF5000-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 225, "B_mm": 100, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 748, "static_load_kN": 1290, "fatigue_load_limit_kN": 143, "max_rpm": 560, "reference_speed_rpm": 560, "limiting_speed_rpm": 560, "weight_g": 13500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 150 mm shaft, SKF lists NNF5030-B-2LS as sealed double-row full-complement cylindrical roller: 225 mm OD, 100 mm wide, Pu 143 kN, with a sealed limiting speed of 560 r/min. Structurally, the NNF design has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed. In arrangement terms it is a sealed locating unit for very heavy radial loads; the sealed-for-life execution is the classic crane-sheave bearing. The B-2LS suffix denotes nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Speed planning for NNF5030-B-2LS: SKF publishes only a limiting speed of 560 r/min for this sealed execution — the seal contact and packed grease, not a thermal reference speed, set the ceiling. The mass entry 13500 g covers the complete catalogue execution including factory grease fill and both seals. Fit practice for NNF5030-B-2LS: mount as a complete sealed unit — never wash out the factory grease; the seals set the speed ceiling, and relubrication, where specified, goes through the ring grooves. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "heavy dock and shipyard crane systems", "mining dragline and shovel rope sheaves", "large offshore hook blocks and jib sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "seal-lip wear and grease loss in dusty crane and construction service after the relubrication interval is exceeded", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "grease degradation inside the sealed unit after long high-temperature periods, invisible until noise rises", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "The sealed NNF unit is packed for life with the correct grease — do not heat it above the seal limit or wash it before mounting; damaged lip seals invalidate the heavy-load duty.", "The B1 width (99 mm inner-assembly width) differs from the overall B 100 mm; check housing and spacer geometry against both values.", "Catalogue reference and limiting speeds are different criteria, though only the limiting speed is published for this sealed unit: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria, though only the limiting speed is published for this sealed unit: observe the mechanical ceiling even when thermal calculations allow more.", "The 748/1290 kN ratings are SKF catalogue 17000 (2018) values for the B-2LS execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNF5030-B-2LS?", "a": "SKF NNF 5030 B-2LS is a sealed double-row full-complement cylindrical roller bearing with 150 mm bore, 225 mm OD and 100 mm width per ISO 15. SKF lists C 748 kN, C0 1290 kN, Pu 143 kN, limiting speed 560 r/min (sealed execution), mass about 13500 g. Inner-assembly width B1 is 99 mm." }, { "q": "What does the NNF designation and B-2LS suffix mean?", "a": "The B-2LS suffix denotes nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. Structurally this execution has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed." }, { "q": "Can NNF5030-B-2LS take axial load and locate the shaft?", "a": "The sealed NNF unit can guide light axial loads in both directions via the flanged inner ring, but its primary duty is very heavy radial load in sealed positions." }, { "q": "How does NNF5030-B-2LS compare with the other executions in the same envelope?", "a": "The sealed NNF execution shares its envelope with the open NNCF/NNCL/NNC full-complement bearings but is delivered grease-packed with contact seals and a much lower speed ceiling." }, { "q": "Does the sealed NNF bearing need relubrication?", "a": "NNF bearings are delivered grease-packed and sealed for long service; where the design provides relubrication grooves/holes, replenish through them at the prescribed interval. Never wash the bearing out or exceed the seal-limited speed." } ], "cross_ref": [ { "equiv_sku": "NNCF5030-CV", "equiv_brand": "SKF", "level": "partial", "note": "Open full-complement counterpart on the same 150×225×100 mm envelope; this B-2LS row is sealed both sides and grease-packed with a lower limiting speed, and its catalogue ratings differ from the open execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.5 sealed double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNF5030-B-2LS", "SKF NNF 5030 B-2LS" ], "locale_variants": {} }, { "sku": "NNF5032-B-2LS", "brand": "SKF", "manufacturer_designation": "SKF NNF 5032 B-2LS", "series": "NNF5000-series", "type": "cylindrical_roller", "d_mm": 160, "D_mm": 240, "B_mm": 109, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 781, "static_load_kN": 1400, "fatigue_load_limit_kN": 153, "max_rpm": 500, "reference_speed_rpm": 500, "limiting_speed_rpm": 500, "weight_g": 16500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NNF 5032 B-2LS denotes a sealed double-row full-complement cylindrical roller bearing on the ISO 15 160×240×109 mm envelope, dimension series 50 (compact heavy section, wide), with catalogue mass 16500 g. Structurally, the NNF design has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed. In arrangement terms it is a sealed locating unit for very heavy radial loads; the sealed-for-life execution is the classic crane-sheave bearing. The B-2LS suffix denotes nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. With C 781 kN and C0 1400 kN, size the bearing on the 160×240 mm ISO 15 envelope and check the 153 kN Pu against the equivalent-load floor; SKF publishes only a limiting speed of 500 r/min for this sealed execution — the seal contact and packed grease, not a thermal reference speed, set the ceiling. Mounting: mount as a complete sealed unit — never wash out the factory grease; the seals set the speed ceiling, and relubrication, where specified, goes through the ring grooves. A 160 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "mining dragline and shovel rope sheaves", "large offshore hook blocks and jib sheaves", "heavy dock and shipyard crane systems" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "seal-lip wear and grease loss in dusty crane and construction service after the relubrication interval is exceeded", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "grease degradation inside the sealed unit after long high-temperature periods, invisible until noise rises", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "The sealed NNF unit is packed for life with the correct grease — do not heat it above the seal limit or wash it before mounting; damaged lip seals invalidate the heavy-load duty.", "The B1 width (108 mm inner-assembly width) differs from the overall B 109 mm; check housing and spacer geometry against both values.", "Catalogue reference and limiting speeds are different criteria, though only the limiting speed is published for this sealed unit: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 109 mm-wide ring and concentrates load.", "The 781/1400 kN ratings are SKF catalogue 17000 (2018) values for the B-2LS execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNF5032-B-2LS?", "a": "SKF NNF 5032 B-2LS is a sealed double-row full-complement cylindrical roller bearing with 160 mm bore, 240 mm OD and 109 mm width per ISO 15. SKF lists C 781 kN, C0 1400 kN, Pu 153 kN, limiting speed 500 r/min (sealed execution), mass about 16500 g. Inner-assembly width B1 is 108 mm." }, { "q": "What does the NNF designation and B-2LS suffix mean?", "a": "The B-2LS suffix denotes nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. Structurally this execution has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed." }, { "q": "Can NNF5032-B-2LS take axial load and locate the shaft?", "a": "The sealed NNF unit can guide light axial loads in both directions via the flanged inner ring, but its primary duty is very heavy radial load in sealed positions." }, { "q": "How does NNF5032-B-2LS compare with the other executions in the same envelope?", "a": "The sealed NNF execution shares its envelope with the open NNCF/NNCL/NNC full-complement bearings but is delivered grease-packed with contact seals and a much lower speed ceiling." }, { "q": "Does the sealed NNF bearing need relubrication?", "a": "NNF bearings are delivered grease-packed and sealed for long service; where the design provides relubrication grooves/holes, replenish through them at the prescribed interval. Never wash the bearing out or exceed the seal-limited speed." } ], "cross_ref": [ { "equiv_sku": "NNCF5032-CV", "equiv_brand": "SKF", "level": "partial", "note": "Open full-complement counterpart on the same 160×240×109 mm envelope; this B-2LS row is sealed both sides and grease-packed with a lower limiting speed, and its catalogue ratings differ from the open execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.5 sealed double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNF5032-B-2LS", "SKF NNF 5032 B-2LS" ], "locale_variants": {} }, { "sku": "NNF5034-B-2LS", "brand": "SKF", "manufacturer_designation": "SKF NNF 5034 B-2LS", "series": "NNF5000-series", "type": "cylindrical_roller", "d_mm": 170, "D_mm": 260, "B_mm": 122, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1010, "static_load_kN": 1800, "fatigue_load_limit_kN": 193, "max_rpm": 480, "reference_speed_rpm": 480, "limiting_speed_rpm": 480, "weight_g": 22500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NNF5034-B-2LS is the 170 mm bore entry in the NNF5000 range: a 170×260×122 mm sealed double-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 1010 kN / C0 1800 kN. Structurally, the NNF design has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed. In arrangement terms it is a sealed locating unit for very heavy radial loads; the sealed-for-life execution is the classic crane-sheave bearing. The B-2LS suffix denotes nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. Selection arithmetic: C0/C ≈ 1.78 (1800 against 1010 kN), and the Pu figure 193 kN is the fatigue load-limit floor for the SKF life equation; SKF publishes only a limiting speed of 480 r/min for this sealed execution — the seal contact and packed grease, not a thermal reference speed, set the ceiling. Fit practice for NNF5034-B-2LS: mount as a complete sealed unit — never wash out the factory grease; the seals set the speed ceiling, and relubrication, where specified, goes through the ring grooves. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "mining dragline and shovel rope sheaves", "large offshore hook blocks and jib sheaves", "heavy dock and shipyard crane systems" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "seal-lip wear and grease loss in dusty crane and construction service after the relubrication interval is exceeded", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "grease degradation inside the sealed unit after long high-temperature periods, invisible until noise rises", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "The sealed NNF unit is packed for life with the correct grease — do not heat it above the seal limit or wash it before mounting; damaged lip seals invalidate the heavy-load duty.", "The B1 width (121 mm inner-assembly width) differs from the overall B 122 mm; check housing and spacer geometry against both values.", "Catalogue reference and limiting speeds are different criteria, though only the limiting speed is published for this sealed unit: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 122 mm-wide ring and concentrates load.", "The 1010/1800 kN ratings are SKF catalogue 17000 (2018) values for the B-2LS execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNF5034-B-2LS?", "a": "SKF NNF 5034 B-2LS is a sealed double-row full-complement cylindrical roller bearing with 170 mm bore, 260 mm OD and 122 mm width per ISO 15. SKF lists C 1010 kN, C0 1800 kN, Pu 193 kN, limiting speed 480 r/min (sealed execution), mass about 22500 g. Inner-assembly width B1 is 121 mm." }, { "q": "What does the NNF designation and B-2LS suffix mean?", "a": "The B-2LS suffix denotes nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. Structurally this execution has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed." }, { "q": "Can NNF5034-B-2LS take axial load and locate the shaft?", "a": "The sealed NNF unit can guide light axial loads in both directions via the flanged inner ring, but its primary duty is very heavy radial load in sealed positions." }, { "q": "How does NNF5034-B-2LS compare with the other executions in the same envelope?", "a": "The sealed NNF execution shares its envelope with the open NNCF/NNCL/NNC full-complement bearings but is delivered grease-packed with contact seals and a much lower speed ceiling." }, { "q": "Does the sealed NNF bearing need relubrication?", "a": "NNF bearings are delivered grease-packed and sealed for long service; where the design provides relubrication grooves/holes, replenish through them at the prescribed interval. Never wash the bearing out or exceed the seal-limited speed." } ], "cross_ref": [ { "equiv_sku": "NNCF5034-CV", "equiv_brand": "SKF", "level": "partial", "note": "Open full-complement counterpart on the same 170×260×122 mm envelope; this B-2LS row is sealed both sides and grease-packed with a lower limiting speed, and its catalogue ratings differ from the open execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.5 sealed double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNF5034-B-2LS", "SKF NNF 5034 B-2LS" ], "locale_variants": {} }, { "sku": "NNF5036-B-2LS", "brand": "SKF", "manufacturer_designation": "SKF NNF 5036 B-2LS", "series": "NNF5000-series", "type": "cylindrical_roller", "d_mm": 180, "D_mm": 280, "B_mm": 136, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1170, "static_load_kN": 2120, "fatigue_load_limit_kN": 228, "max_rpm": 450, "reference_speed_rpm": 450, "limiting_speed_rpm": 450, "weight_g": 31000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NNF 5036 B-2LS denotes a sealed double-row full-complement cylindrical roller bearing on the ISO 15 180×280×136 mm envelope, dimension series 50 (compact heavy section, wide), with catalogue mass 31000 g. The NNF configuration means a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed; functionally the bearing is a sealed locating unit for very heavy radial loads; the sealed-for-life execution is the classic crane-sheave bearing. Reading the order-string suffix B-2LS: nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. Selection arithmetic: C0/C ≈ 1.81 (2120 against 1170 kN), and the Pu figure 228 kN is the fatigue load-limit floor for the SKF life equation; SKF publishes only a limiting speed of 450 r/min for this sealed execution — the seal contact and packed grease, not a thermal reference speed, set the ceiling. Fit practice for NNF5036-B-2LS: mount as a complete sealed unit — never wash out the factory grease; the seals set the speed ceiling, and relubrication, where specified, goes through the ring grooves. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "heavy dock and shipyard crane systems", "mining dragline and shovel rope sheaves", "large offshore hook blocks and jib sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "seal-lip wear and grease loss in dusty crane and construction service after the relubrication interval is exceeded", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "grease degradation inside the sealed unit after long high-temperature periods, invisible until noise rises", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "The sealed NNF unit is packed for life with the correct grease — do not heat it above the seal limit or wash it before mounting; damaged lip seals invalidate the heavy-load duty.", "The B1 width (135 mm inner-assembly width) differs from the overall B 136 mm; check housing and spacer geometry against both values.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 280 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 280 mm raceway.", "The 1170/2120 kN ratings are SKF catalogue 17000 (2018) values for the B-2LS execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNF5036-B-2LS?", "a": "SKF NNF 5036 B-2LS is a sealed double-row full-complement cylindrical roller bearing with 180 mm bore, 280 mm OD and 136 mm width per ISO 15. SKF lists C 1170 kN, C0 2120 kN, Pu 228 kN, limiting speed 450 r/min (sealed execution), mass about 31000 g. Inner-assembly width B1 is 135 mm." }, { "q": "What does the NNF designation and B-2LS suffix mean?", "a": "The B-2LS suffix denotes nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. Structurally this execution has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed." }, { "q": "Can NNF5036-B-2LS take axial load and locate the shaft?", "a": "The sealed NNF unit can guide light axial loads in both directions via the flanged inner ring, but its primary duty is very heavy radial load in sealed positions." }, { "q": "How does NNF5036-B-2LS compare with the other executions in the same envelope?", "a": "The sealed NNF execution shares its envelope with the open NNCF/NNCL/NNC full-complement bearings but is delivered grease-packed with contact seals and a much lower speed ceiling." }, { "q": "Does the sealed NNF bearing need relubrication?", "a": "NNF bearings are delivered grease-packed and sealed for long service; where the design provides relubrication grooves/holes, replenish through them at the prescribed interval. Never wash the bearing out or exceed the seal-limited speed." } ], "cross_ref": [ { "equiv_sku": "NNCF5036-CV", "equiv_brand": "SKF", "level": "partial", "note": "Open full-complement counterpart on the same 180×280×136 mm envelope; this B-2LS row is sealed both sides and grease-packed with a lower limiting speed, and its catalogue ratings differ from the open execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.5 sealed double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNF5036-B-2LS", "SKF NNF 5036 B-2LS" ], "locale_variants": {} }, { "sku": "NNF5038-B-2LS", "brand": "SKF", "manufacturer_designation": "SKF NNF 5038 B-2LS", "series": "NNF5000-series", "type": "cylindrical_roller", "d_mm": 190, "D_mm": 290, "B_mm": 136, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1190, "static_load_kN": 2200, "fatigue_load_limit_kN": 236, "max_rpm": 430, "reference_speed_rpm": 430, "limiting_speed_rpm": 430, "weight_g": 31500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NNF5038-B-2LS is the 190 mm bore entry in the NNF5000 range: a 190×290×136 mm sealed double-row full-complement cylindrical roller bearing with a full complement of extra rollers fitted in place of a cage, rated C 1190 kN / C0 2200 kN. The NNF configuration means a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed; functionally the bearing is a sealed locating unit for very heavy radial loads; the sealed-for-life execution is the classic crane-sheave bearing. The B-2LS suffix denotes nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. Speed planning for NNF5038-B-2LS: SKF publishes only a limiting speed of 430 r/min for this sealed execution — the seal contact and packed grease, not a thermal reference speed, set the ceiling. The mass entry 31500 g covers the complete catalogue execution including factory grease fill and both seals. Assembly note: mount as a complete sealed unit — never wash out the factory grease; the seals set the speed ceiling, and relubrication, where specified, goes through the ring grooves. Heat steel rings inductively to max 120 °C, and never wash a full-complement unit in a way that displaces rollers.", "applications": [ "heavy dock and shipyard crane systems", "mining dragline and shovel rope sheaves", "large offshore hook blocks and jib sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "seal-lip wear and grease loss in dusty crane and construction service after the relubrication interval is exceeded", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "grease degradation inside the sealed unit after long high-temperature periods, invisible until noise rises", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "The sealed NNF unit is packed for life with the correct grease — do not heat it above the seal limit or wash it before mounting; damaged lip seals invalidate the heavy-load duty.", "The B1 width (135 mm inner-assembly width) differs from the overall B 136 mm; check housing and spacer geometry against both values.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 290 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 290 mm raceway.", "The 1190/2200 kN ratings are SKF catalogue 17000 (2018) values for the B-2LS execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNF5038-B-2LS?", "a": "SKF NNF 5038 B-2LS is a sealed double-row full-complement cylindrical roller bearing with 190 mm bore, 290 mm OD and 136 mm width per ISO 15. SKF lists C 1190 kN, C0 2200 kN, Pu 236 kN, limiting speed 430 r/min (sealed execution), mass about 31500 g. Inner-assembly width B1 is 135 mm." }, { "q": "What does the NNF designation and B-2LS suffix mean?", "a": "The B-2LS suffix denotes nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. Structurally this execution has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed." }, { "q": "Can NNF5038-B-2LS take axial load and locate the shaft?", "a": "The sealed NNF unit can guide light axial loads in both directions via the flanged inner ring, but its primary duty is very heavy radial load in sealed positions." }, { "q": "How does NNF5038-B-2LS compare with the other executions in the same envelope?", "a": "The sealed NNF execution shares its envelope with the open NNCF/NNCL/NNC full-complement bearings but is delivered grease-packed with contact seals and a much lower speed ceiling." }, { "q": "Does the sealed NNF bearing need relubrication?", "a": "NNF bearings are delivered grease-packed and sealed for long service; where the design provides relubrication grooves/holes, replenish through them at the prescribed interval. Never wash the bearing out or exceed the seal-limited speed." } ], "cross_ref": [ { "equiv_sku": "NNCF5038-CV", "equiv_brand": "SKF", "level": "partial", "note": "Open full-complement counterpart on the same 190×290×136 mm envelope; this B-2LS row is sealed both sides and grease-packed with a lower limiting speed, and its catalogue ratings differ from the open execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.5 sealed double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNF5038-B-2LS", "SKF NNF 5038 B-2LS" ], "locale_variants": {} }, { "sku": "NNF5040-B-2LS", "brand": "SKF", "manufacturer_designation": "SKF NNF 5040 B-2LS", "series": "NNF5000-series", "type": "cylindrical_roller", "d_mm": 200, "D_mm": 310, "B_mm": 150, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1450, "static_load_kN": 2900, "fatigue_load_limit_kN": 300, "max_rpm": 400, "reference_speed_rpm": 400, "limiting_speed_rpm": 400, "weight_g": 42000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NNF 5040 B-2LS resolves to a 200×310×150 mm sealed double-row full-complement cylindrical roller bearing (dimension series 50 (compact heavy section, wide)); a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed. Structurally, the NNF design has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed. In arrangement terms it is a sealed locating unit for very heavy radial loads; the sealed-for-life execution is the classic crane-sheave bearing. Reading the order-string suffix B-2LS: nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. Load-per-bore for the 200 mm seat is about 7.25 kN/mm, typical of dimension series 50 (compact heavy section, wide); use C0 2900 kN for static checks such as crane hook blocks standing under load. Mounting: mount as a complete sealed unit — never wash out the factory grease; the seals set the speed ceiling, and relubrication, where specified, goes through the ring grooves. A 200 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "heavy dock and shipyard crane systems", "mining dragline and shovel rope sheaves", "large offshore hook blocks and jib sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "seal-lip wear and grease loss in dusty crane and construction service after the relubrication interval is exceeded", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "grease degradation inside the sealed unit after long high-temperature periods, invisible until noise rises", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "The sealed NNF unit is packed for life with the correct grease — do not heat it above the seal limit or wash it before mounting; damaged lip seals invalidate the heavy-load duty.", "The B1 width (149 mm inner-assembly width) differs from the overall B 150 mm; check housing and spacer geometry against both values.", "Catalogue reference and limiting speeds are different criteria, though only the limiting speed is published for this sealed unit: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria, though only the limiting speed is published for this sealed unit: observe the mechanical ceiling even when thermal calculations allow more.", "The 1450/2900 kN ratings are SKF catalogue 17000 (2018) values for the B-2LS execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNF5040-B-2LS?", "a": "SKF NNF 5040 B-2LS is a sealed double-row full-complement cylindrical roller bearing with 200 mm bore, 310 mm OD and 150 mm width per ISO 15. SKF lists C 1450 kN, C0 2900 kN, Pu 300 kN, limiting speed 400 r/min (sealed execution), mass about 42000 g. Inner-assembly width B1 is 149 mm." }, { "q": "What does the NNF designation and B-2LS suffix mean?", "a": "The B-2LS suffix denotes nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. Structurally this execution has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed." }, { "q": "Can NNF5040-B-2LS take axial load and locate the shaft?", "a": "The sealed NNF unit can guide light axial loads in both directions via the flanged inner ring, but its primary duty is very heavy radial load in sealed positions." }, { "q": "How does NNF5040-B-2LS compare with the other executions in the same envelope?", "a": "The sealed NNF execution shares its envelope with the open NNCF/NNCL/NNC full-complement bearings but is delivered grease-packed with contact seals and a much lower speed ceiling." }, { "q": "Does the sealed NNF bearing need relubrication?", "a": "NNF bearings are delivered grease-packed and sealed for long service; where the design provides relubrication grooves/holes, replenish through them at the prescribed interval. Never wash the bearing out or exceed the seal-limited speed." } ], "cross_ref": [ { "equiv_sku": "NNCF5040-CV", "equiv_brand": "SKF", "level": "partial", "note": "Open full-complement counterpart on the same 200×310×150 mm envelope; this B-2LS row is sealed both sides and grease-packed with a lower limiting speed, and its catalogue ratings differ from the open execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.5 sealed double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNF5040-B-2LS", "SKF NNF 5040 B-2LS" ], "locale_variants": {} }, { "sku": "NNF5044-B-2LS", "brand": "SKF", "manufacturer_designation": "SKF NNF 5044 B-2LS", "series": "NNF5000-series", "type": "cylindrical_roller", "d_mm": 220, "D_mm": 340, "B_mm": 160, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1610, "static_load_kN": 3100, "fatigue_load_limit_kN": 315, "max_rpm": 360, "reference_speed_rpm": 360, "limiting_speed_rpm": 360, "weight_g": 54000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NNF 5044 B-2LS denotes a sealed double-row full-complement cylindrical roller bearing on the ISO 15 220×340×160 mm envelope, dimension series 50 (compact heavy section, wide), with catalogue mass 54000 g. Structurally, the NNF design has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed. In arrangement terms it is a sealed locating unit for very heavy radial loads; the sealed-for-life execution is the classic crane-sheave bearing. The B-2LS suffix denotes nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. The full complement of extra rollers fitted in place of a cage is reflected in the published speeds and temperature limits. The radial section height is 60.0 mm and the catalogue mass 54000 g; at 1610 kN dynamic rating this is roughly 7.32 kN of C per millimetre of bore before application factors. Mounting: mount as a complete sealed unit — never wash out the factory grease; the seals set the speed ceiling, and relubrication, where specified, goes through the ring grooves. A 220 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "mining dragline and shovel rope sheaves", "large offshore hook blocks and jib sheaves", "heavy dock and shipyard crane systems" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "seal-lip wear and grease loss in dusty crane and construction service after the relubrication interval is exceeded", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "grease degradation inside the sealed unit after long high-temperature periods, invisible until noise rises", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "The sealed NNF unit is packed for life with the correct grease — do not heat it above the seal limit or wash it before mounting; damaged lip seals invalidate the heavy-load duty.", "The B1 width (159 mm inner-assembly width) differs from the overall B 160 mm; check housing and spacer geometry against both values.", "Catalogue reference and limiting speeds are different criteria, though only the limiting speed is published for this sealed unit: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 160 mm-wide ring and concentrates load.", "The 1610/3100 kN ratings are SKF catalogue 17000 (2018) values for the B-2LS execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNF5044-B-2LS?", "a": "SKF NNF 5044 B-2LS is a sealed double-row full-complement cylindrical roller bearing with 220 mm bore, 340 mm OD and 160 mm width per ISO 15. SKF lists C 1610 kN, C0 3100 kN, Pu 315 kN, limiting speed 360 r/min (sealed execution), mass about 54000 g. Inner-assembly width B1 is 159 mm." }, { "q": "What does the NNF designation and B-2LS suffix mean?", "a": "The B-2LS suffix denotes nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. Structurally this execution has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed." }, { "q": "Can NNF5044-B-2LS take axial load and locate the shaft?", "a": "The sealed NNF unit can guide light axial loads in both directions via the flanged inner ring, but its primary duty is very heavy radial load in sealed positions." }, { "q": "How does NNF5044-B-2LS compare with the other executions in the same envelope?", "a": "The sealed NNF execution shares its envelope with the open NNCF/NNCL/NNC full-complement bearings but is delivered grease-packed with contact seals and a much lower speed ceiling." }, { "q": "Does the sealed NNF bearing need relubrication?", "a": "NNF bearings are delivered grease-packed and sealed for long service; where the design provides relubrication grooves/holes, replenish through them at the prescribed interval. Never wash the bearing out or exceed the seal-limited speed." } ], "cross_ref": [ { "equiv_sku": "NNCF5044-CV", "equiv_brand": "SKF", "level": "partial", "note": "Open full-complement counterpart on the same 220×340×160 mm envelope; this B-2LS row is sealed both sides and grease-packed with a lower limiting speed, and its catalogue ratings differ from the open execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.5 sealed double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNF5044-B-2LS", "SKF NNF 5044 B-2LS" ], "locale_variants": {} }, { "sku": "NNF5048-B-2LS", "brand": "SKF", "manufacturer_designation": "SKF NNF 5048 B-2LS", "series": "NNF5000-series", "type": "cylindrical_roller", "d_mm": 240, "D_mm": 360, "B_mm": 160, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 1680, "static_load_kN": 3350, "fatigue_load_limit_kN": 335, "max_rpm": 340, "reference_speed_rpm": 340, "limiting_speed_rpm": 340, "weight_g": 57500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NNF 5048 B-2LS denotes a sealed double-row full-complement cylindrical roller bearing on the ISO 15 240×360×160 mm envelope, dimension series 50 (compact heavy section, wide), with catalogue mass 57500 g. Structurally, the NNF design has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed. In arrangement terms it is a sealed locating unit for very heavy radial loads; the sealed-for-life execution is the classic crane-sheave bearing. Reading the order-string suffix B-2LS: nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. Speed planning for NNF5048-B-2LS: SKF publishes only a limiting speed of 340 r/min for this sealed execution — the seal contact and packed grease, not a thermal reference speed, set the ceiling. The mass entry 57500 g covers the complete catalogue execution including factory grease fill and both seals. Fit practice for NNF5048-B-2LS: mount as a complete sealed unit — never wash out the factory grease; the seals set the speed ceiling, and relubrication, where specified, goes through the ring grooves. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "large offshore hook blocks and jib sheaves", "heavy dock and shipyard crane systems", "mining dragline and shovel rope sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "seal-lip wear and grease loss in dusty crane and construction service after the relubrication interval is exceeded", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "grease degradation inside the sealed unit after long high-temperature periods, invisible until noise rises", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "The sealed NNF unit is packed for life with the correct grease — do not heat it above the seal limit or wash it before mounting; damaged lip seals invalidate the heavy-load duty.", "The B1 width (159 mm inner-assembly width) differs from the overall B 160 mm; check housing and spacer geometry against both values.", "Catalogue reference and limiting speeds are different criteria, though only the limiting speed is published for this sealed unit: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 360 mm raceway.", "The 1680/3350 kN ratings are SKF catalogue 17000 (2018) values for the B-2LS execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNF5048-B-2LS?", "a": "SKF NNF 5048 B-2LS is a sealed double-row full-complement cylindrical roller bearing with 240 mm bore, 360 mm OD and 160 mm width per ISO 15. SKF lists C 1680 kN, C0 3350 kN, Pu 335 kN, limiting speed 340 r/min (sealed execution), mass about 57500 g. Inner-assembly width B1 is 159 mm." }, { "q": "What does the NNF designation and B-2LS suffix mean?", "a": "The B-2LS suffix denotes nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. Structurally this execution has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed." }, { "q": "Can NNF5048-B-2LS take axial load and locate the shaft?", "a": "The sealed NNF unit can guide light axial loads in both directions via the flanged inner ring, but its primary duty is very heavy radial load in sealed positions." }, { "q": "How does NNF5048-B-2LS compare with the other executions in the same envelope?", "a": "The sealed NNF execution shares its envelope with the open NNCF/NNCL/NNC full-complement bearings but is delivered grease-packed with contact seals and a much lower speed ceiling." }, { "q": "Does the sealed NNF bearing need relubrication?", "a": "NNF bearings are delivered grease-packed and sealed for long service; where the design provides relubrication grooves/holes, replenish through them at the prescribed interval. Never wash the bearing out or exceed the seal-limited speed." } ], "cross_ref": [ { "equiv_sku": "NNCF5048-CV", "equiv_brand": "SKF", "level": "partial", "note": "Open full-complement counterpart on the same 240×360×160 mm envelope; this B-2LS row is sealed both sides and grease-packed with a lower limiting speed, and its catalogue ratings differ from the open execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.5 sealed double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNF5048-B-2LS", "SKF NNF 5048 B-2LS" ], "locale_variants": {} }, { "sku": "NNF5052-B-2LS", "brand": "SKF", "manufacturer_designation": "SKF NNF 5052 B-2LS", "series": "NNF5000-series", "type": "cylindrical_roller", "d_mm": 260, "D_mm": 400, "B_mm": 190, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 2420, "static_load_kN": 4650, "fatigue_load_limit_kN": 455, "max_rpm": 300, "reference_speed_rpm": 300, "limiting_speed_rpm": 300, "weight_g": 86000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NNF 5052 B-2LS resolves to a 260×400×190 mm sealed double-row full-complement cylindrical roller bearing (dimension series 50 (compact heavy section, wide)); a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed. Reading the NNF prefix: a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed. This makes the execution a sealed locating unit for very heavy radial loads; the sealed-for-life execution is the classic crane-sheave bearing. Reading the order-string suffix B-2LS: nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. With C 2420 kN and C0 4650 kN, size the bearing on the 260×400 mm ISO 15 envelope and check the 455 kN Pu against the equivalent-load floor; SKF publishes only a limiting speed of 300 r/min for this sealed execution — the seal contact and packed grease, not a thermal reference speed, set the ceiling. Mounting: mount as a complete sealed unit — never wash out the factory grease; the seals set the speed ceiling, and relubrication, where specified, goes through the ring grooves. A 260 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "large offshore hook blocks and jib sheaves", "heavy dock and shipyard crane systems", "mining dragline and shovel rope sheaves" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "seal-lip wear and grease loss in dusty crane and construction service after the relubrication interval is exceeded", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "grease degradation inside the sealed unit after long high-temperature periods, invisible until noise rises", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "The sealed NNF unit is packed for life with the correct grease — do not heat it above the seal limit or wash it before mounting; damaged lip seals invalidate the heavy-load duty.", "The B1 width (189 mm inner-assembly width) differs from the overall B 190 mm; check housing and spacer geometry against both values.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 190 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria, though only the limiting speed is published for this sealed unit: observe the mechanical ceiling even when thermal calculations allow more.", "The 2420/4650 kN ratings are SKF catalogue 17000 (2018) values for the B-2LS execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNF5052-B-2LS?", "a": "SKF NNF 5052 B-2LS is a sealed double-row full-complement cylindrical roller bearing with 260 mm bore, 400 mm OD and 190 mm width per ISO 15. SKF lists C 2420 kN, C0 4650 kN, Pu 455 kN, limiting speed 300 r/min (sealed execution), mass about 86000 g. Inner-assembly width B1 is 189 mm." }, { "q": "What does the NNF designation and B-2LS suffix mean?", "a": "The B-2LS suffix denotes nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. Structurally this execution has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed." }, { "q": "Can NNF5052-B-2LS take axial load and locate the shaft?", "a": "The sealed NNF unit can guide light axial loads in both directions via the flanged inner ring, but its primary duty is very heavy radial load in sealed positions." }, { "q": "How does NNF5052-B-2LS compare with the other executions in the same envelope?", "a": "The sealed NNF execution shares its envelope with the open NNCF/NNCL/NNC full-complement bearings but is delivered grease-packed with contact seals and a much lower speed ceiling." }, { "q": "Does the sealed NNF bearing need relubrication?", "a": "NNF bearings are delivered grease-packed and sealed for long service; where the design provides relubrication grooves/holes, replenish through them at the prescribed interval. Never wash the bearing out or exceed the seal-limited speed." } ], "cross_ref": [ { "equiv_sku": "NNCF5052-CV", "equiv_brand": "SKF", "level": "partial", "note": "Open full-complement counterpart on the same 260×400×190 mm envelope; this B-2LS row is sealed both sides and grease-packed with a lower limiting speed, and its catalogue ratings differ from the open execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.5 sealed double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNF5052-B-2LS", "SKF NNF 5052 B-2LS" ], "locale_variants": {} }, { "sku": "NNF5056-B-2LS", "brand": "SKF", "manufacturer_designation": "SKF NNF 5056 B-2LS", "series": "NNF5000-series", "type": "cylindrical_roller", "d_mm": 280, "D_mm": 420, "B_mm": 190, "material": "GCr15", "seal_type": "2RS", "clearance": "CN", "tolerance_class": "P0", "cage_type": "none", "dynamic_load_kN": 2550, "static_load_kN": 5000, "fatigue_load_limit_kN": 490, "max_rpm": 280, "reference_speed_rpm": 280, "limiting_speed_rpm": 280, "weight_g": 91000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NNF 5056 B-2LS resolves to a 280×420×190 mm sealed double-row full-complement cylindrical roller bearing (dimension series 50 (compact heavy section, wide)); a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed. Structurally, the NNF design has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed. In arrangement terms it is a sealed locating unit for very heavy radial loads; the sealed-for-life execution is the classic crane-sheave bearing. The B-2LS suffix denotes nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. Selection arithmetic: C0/C ≈ 1.96 (5000 against 2550 kN), and the Pu figure 490 kN is the fatigue load-limit floor for the SKF life equation; SKF publishes only a limiting speed of 280 r/min for this sealed execution — the seal contact and packed grease, not a thermal reference speed, set the ceiling. Fit practice for NNF5056-B-2LS: mount as a complete sealed unit — never wash out the factory grease; the seals set the speed ceiling, and relubrication, where specified, goes through the ring grooves. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "mining dragline and shovel rope sheaves", "large offshore hook blocks and jib sheaves", "heavy dock and shipyard crane systems" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "seal-lip wear and grease loss in dusty crane and construction service after the relubrication interval is exceeded", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "grease degradation inside the sealed unit after long high-temperature periods, invisible until noise rises", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "The sealed NNF unit is packed for life with the correct grease — do not heat it above the seal limit or wash it before mounting; damaged lip seals invalidate the heavy-load duty.", "The B1 width (189 mm inner-assembly width) differs from the overall B 190 mm; check housing and spacer geometry against both values.", "Catalogue reference and limiting speeds are different criteria, though only the limiting speed is published for this sealed unit: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 190 mm-wide ring and concentrates load.", "The 2550/5000 kN ratings are SKF catalogue 17000 (2018) values for the B-2LS execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NNF5056-B-2LS?", "a": "SKF NNF 5056 B-2LS is a sealed double-row full-complement cylindrical roller bearing with 280 mm bore, 420 mm OD and 190 mm width per ISO 15. SKF lists C 2550 kN, C0 5000 kN, Pu 490 kN, limiting speed 280 r/min (sealed execution), mass about 91000 g. Inner-assembly width B1 is 189 mm." }, { "q": "What does the NNF designation and B-2LS suffix mean?", "a": "The B-2LS suffix denotes nitrile-rubber contact seals on both sides of a grease-packed full-complement unit. Structurally this execution has a double-row full complement bearing with contact seals on both sides, three integral inner-ring flanges, an annular lube groove in the outer ring and additional lubrication holes in the inner ring, delivered grease-packed." }, { "q": "Can NNF5056-B-2LS take axial load and locate the shaft?", "a": "The sealed NNF unit can guide light axial loads in both directions via the flanged inner ring, but its primary duty is very heavy radial load in sealed positions." }, { "q": "How does NNF5056-B-2LS compare with the other executions in the same envelope?", "a": "The sealed NNF execution shares its envelope with the open NNCF/NNCL/NNC full-complement bearings but is delivered grease-packed with contact seals and a much lower speed ceiling." }, { "q": "Does the sealed NNF bearing need relubrication?", "a": "NNF bearings are delivered grease-packed and sealed for long service; where the design provides relubrication grooves/holes, replenish through them at the prescribed interval. Never wash the bearing out or exceed the seal-limited speed." } ], "cross_ref": [ { "equiv_sku": "NNCF5056-CV", "equiv_brand": "SKF", "level": "partial", "note": "Open full-complement counterpart on the same 280×420×190 mm envelope; this B-2LS row is sealed both sides and grease-packed with a lower limiting speed, and its catalogue ratings differ from the open execution." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.5 sealed double-row full complement cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NNF5056-B-2LS", "SKF NNF 5056 B-2LS" ], "locale_variants": {} }, { "sku": "NU10-500-MA", "brand": "SKF", "manufacturer_designation": "SKF NU 10/500 MA", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 500, "D_mm": 720, "B_mm": 100, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 1720, "static_load_kN": 3100, "fatigue_load_limit_kN": 236, "max_rpm": 1100, "reference_speed_rpm": 900, "limiting_speed_rpm": 1100, "weight_g": 135000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NU 10/500 MA resolves to a 500×720×100 mm single-row caged cylindrical roller bearing (dimension series 10 (extra-slim OD, normal width)); two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable. Structurally, the NU design has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable. In arrangement terms it is non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. The one-piece machined brass cage is reflected in the published speeds and temperature limits. With C 1720 kN and C0 3100 kN, size the bearing on the 500×720 mm ISO 15 envelope and check the 236 kN Pu against the equivalent-load floor; the catalogue lists 900 r/min thermal reference speed and 1,100 r/min mechanical limiting speed. Assembly note: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. Heat steel rings inductively to max 120 °C.", "applications": [ "heavy turbogenerator rotor supports", "mining hoist and winder shafts", "offshore drawworks shafts", "large rolling-mill drive trains" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 10/500, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 10/500 MA and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 720 mm raceway.", "The 1720/3100 kN ratings are SKF catalogue 17000 (2018) values for the MA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU10-500-MA?", "a": "SKF NU 10/500 MA is a single-row caged cylindrical roller bearing with 500 mm bore, 720 mm OD and 100 mm width per ISO 15. SKF lists C 1720 kN, C0 3100 kN, Pu 236 kN, reference speed 900 r/min and limiting speed 1,100 r/min, mass about 135000 g." }, { "q": "What does the NU designation and MA suffix mean?", "a": "The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU10-500-MA take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU10-500-MA compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU10-500", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "NU10", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU10-500-MA", "SKF NU 10/500 MA" ], "locale_variants": {} }, { "sku": "NU10-530-MA", "brand": "SKF", "manufacturer_designation": "SKF NU 10/530 MA", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 530, "D_mm": 780, "B_mm": 112, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 2290, "static_load_kN": 4050, "fatigue_load_limit_kN": 305, "max_rpm": 1000, "reference_speed_rpm": 800, "limiting_speed_rpm": 1000, "weight_g": 190000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU10-530-MA is the 530 mm bore entry in the NU1000 range: a 530×780×112 mm single-row caged cylindrical roller bearing with a one-piece machined brass cage, rated C 2290 kN / C0 4050 kN. The NU configuration means two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable; functionally the bearing is non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. The radial section height is 125.0 mm and the catalogue mass 190000 g; at 2290 kN dynamic rating this is roughly 4.32 kN of C per millimetre of bore before application factors. Mounting: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. A 530 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "marine propulsion line shafts", "heavy turbogenerator rotor supports", "mining hoist and winder shafts", "offshore drawworks shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 10/530, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 10/530 MA and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 780 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 780 mm raceway.", "The 2290/4050 kN ratings are SKF catalogue 17000 (2018) values for the MA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU10-530-MA?", "a": "SKF NU 10/530 MA is a single-row caged cylindrical roller bearing with 530 mm bore, 780 mm OD and 112 mm width per ISO 15. SKF lists C 2290 kN, C0 4050 kN, Pu 305 kN, reference speed 800 r/min and limiting speed 1,000 r/min, mass about 190000 g." }, { "q": "What does the NU designation and MA suffix mean?", "a": "The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU10-530-MA take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU10-530-MA compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU10-500", "equiv_brand": "NTN", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NU10", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU10-530-MA", "SKF NU 10/530 MA" ], "locale_variants": {} }, { "sku": "NU10-560-MA", "brand": "SKF", "manufacturer_designation": "SKF NU 10/560 MA", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 560, "D_mm": 820, "B_mm": 115, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 2330, "static_load_kN": 4250, "fatigue_load_limit_kN": 310, "max_rpm": 1000, "reference_speed_rpm": 750, "limiting_speed_rpm": 1000, "weight_g": 210000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NU 10/560 MA is a single-row caged cylindrical roller bearing sized 560×820×115 mm — a dimension series 10 (extra-slim OD, normal width), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. The NU configuration means two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable; functionally the bearing is non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. The one-piece machined brass cage is reflected in the published speeds and temperature limits. Load-per-bore for the 560 mm seat is about 4.16 kN/mm, typical of dimension series 10 (extra-slim OD, normal width); use C0 4250 kN for static checks such as crane hook blocks standing under load. Assembly note: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. Heat steel rings inductively to max 120 °C.", "applications": [ "offshore drawworks shafts", "large rolling-mill drive trains", "marine propulsion line shafts", "heavy turbogenerator rotor supports" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 10/560, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 10/560 MA and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 820 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 820 mm raceway.", "The 2330/4250 kN ratings are SKF catalogue 17000 (2018) values for the MA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU10-560-MA?", "a": "SKF NU 10/560 MA is a single-row caged cylindrical roller bearing with 560 mm bore, 820 mm OD and 115 mm width per ISO 15. SKF lists C 2330 kN, C0 4250 kN, Pu 310 kN, reference speed 750 r/min and limiting speed 1,000 r/min, mass about 210000 g." }, { "q": "What does the NU designation and MA suffix mean?", "a": "The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU10-560-MA take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU10-560-MA compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU10-500", "equiv_brand": "NTN", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NU10", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU10-560-MA", "SKF NU 10/560 MA" ], "locale_variants": {} }, { "sku": "NU10-600-MA", "brand": "SKF", "manufacturer_designation": "SKF NU 10/600 MA", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 600, "D_mm": 870, "B_mm": 118, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 2750, "static_load_kN": 5100, "fatigue_load_limit_kN": 365, "max_rpm": 900, "reference_speed_rpm": 700, "limiting_speed_rpm": 900, "weight_g": 240000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NU 10/600 MA is a single-row caged cylindrical roller bearing sized 600×870×118 mm — a dimension series 10 (extra-slim OD, normal width), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. The NU configuration means two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable; functionally the bearing is non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. The one-piece machined brass cage is reflected in the published speeds and temperature limits. Speed planning for NU10-600-MA: the catalogue lists 700 r/min thermal reference speed and 900 r/min mechanical limiting speed. The mass entry 240000 g covers the complete catalogue execution. Fit practice for NU10-600-MA: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "mining hoist and winder shafts", "offshore drawworks shafts", "large rolling-mill drive trains", "marine propulsion line shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 10/600, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 10/600 MA and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 870 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 2750/5100 kN ratings are SKF catalogue 17000 (2018) values for the MA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU10-600-MA?", "a": "SKF NU 10/600 MA is a single-row caged cylindrical roller bearing with 600 mm bore, 870 mm OD and 118 mm width per ISO 15. SKF lists C 2750 kN, C0 5100 kN, Pu 365 kN, reference speed 700 r/min and limiting speed 900 r/min, mass about 240000 g." }, { "q": "What does the NU designation and MA suffix mean?", "a": "The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU10-600-MA take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU10-600-MA compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU10-500", "equiv_brand": "NTN", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NU10", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU10-600-MA", "SKF NU 10/600 MA" ], "locale_variants": {} }, { "sku": "NU10-710-ECMA", "brand": "SKF", "manufacturer_designation": "SKF NU 10/710 ECMA", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 710, "D_mm": 1030, "B_mm": 140, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 4680, "static_load_kN": 8500, "fatigue_load_limit_kN": 570, "max_rpm": 750, "reference_speed_rpm": 560, "limiting_speed_rpm": 750, "weight_g": 415000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NU 10/710 ECMA resolves to a 710×1030×140 mm single-row caged cylindrical roller bearing (dimension series 10 (extra-slim OD, normal width)); two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable. Reading the NU prefix: two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable. This makes the execution non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. The ECMA suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Load-per-bore for the 710 mm seat is about 6.59 kN/mm, typical of dimension series 10 (extra-slim OD, normal width); use C0 8500 kN for static checks such as crane hook blocks standing under load. Fit practice for NU10-710-ECMA: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "offshore drawworks shafts", "large rolling-mill drive trains", "marine propulsion line shafts", "heavy turbogenerator rotor supports" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 10/710, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 10/710 ECMA and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 140 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 140 mm-wide ring and concentrates load.", "The 4680/8500 kN ratings are SKF catalogue 17000 (2018) values for the ECMA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU10-710-ECMA?", "a": "SKF NU 10/710 ECMA is a single-row caged cylindrical roller bearing with 710 mm bore, 1030 mm OD and 140 mm width per ISO 15. SKF lists C 4680 kN, C0 8500 kN, Pu 570 kN, reference speed 560 r/min and limiting speed 750 r/min, mass about 415000 g." }, { "q": "What does the NU designation and ECMA suffix mean?", "a": "The ECMA suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU10-710-ECMA take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU10-710-ECMA compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU10-500", "equiv_brand": "NTN", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NU10", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU10-710-ECMA", "SKF NU 10/710 ECMA" ], "locale_variants": {} }, { "sku": "NU10-750-ECMA-HB1", "brand": "SKF", "manufacturer_designation": "SKF NU 10/750 ECMA/HB1", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 750, "D_mm": 1090, "B_mm": 150, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 4730, "static_load_kN": 8800, "fatigue_load_limit_kN": 585, "max_rpm": 670, "reference_speed_rpm": 430, "limiting_speed_rpm": 670, "weight_g": 487000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NU 10/750 ECMA/HB1 is a single-row caged cylindrical roller bearing sized 750×1090×150 mm — a dimension series 10 (extra-slim OD, normal width), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. Reading the NU prefix: two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable. This makes the execution non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. Reading the order-string suffix ECMA/HB1: the basic execution supplied with a standard pressed-steel cage. The radial section height is 170.0 mm and the catalogue mass 487000 g; at 4730 kN dynamic rating this is roughly 6.31 kN of C per millimetre of bore before application factors. Mounting: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. A 750 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "marine propulsion line shafts", "heavy turbogenerator rotor supports", "mining hoist and winder shafts", "offshore drawworks shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 10/750, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 10/750 ECMA/HB1 and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 150 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 4730/8800 kN ratings are SKF catalogue 17000 (2018) values for the ECMA/HB1 execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU10-750-ECMA-HB1?", "a": "SKF NU 10/750 ECMA/HB1 is a single-row caged cylindrical roller bearing with 750 mm bore, 1090 mm OD and 150 mm width per ISO 15. SKF lists C 4730 kN, C0 8800 kN, Pu 585 kN, reference speed 430 r/min and limiting speed 670 r/min, mass about 487000 g." }, { "q": "What does the NU designation and ECMA/HB1 suffix mean?", "a": "The plain designation (no cage suffix) identifies the basic execution supplied with a standard pressed-steel cage. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU10-750-ECMA-HB1 take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU10-750-ECMA-HB1 compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU10-500", "equiv_brand": "NTN", "level": "verify", "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue." }, { "equiv_sku": "NU10", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU10-750-ECMA-HB1", "SKF NU 10/750 ECMA/HB1" ], "locale_variants": {} }, { "sku": "NU1005", "brand": "SKF", "manufacturer_designation": "SKF NU 1005", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 25, "D_mm": 47, "B_mm": 12, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 14.2, "static_load_kN": 13.2, "fatigue_load_limit_kN": 1.4, "max_rpm": 18000, "reference_speed_rpm": 18000, "limiting_speed_rpm": 18000, "weight_g": 82, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 25 mm shaft, SKF lists NU1005 as single-row caged cylindrical roller: 47 mm OD, 12 mm wide, Pu 1.4 kN, the catalogue lists 18,000 r/min thermal reference speed and 18,000 r/min mechanical limiting speed. Reading the NU prefix: two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable. This makes the execution non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. The plain designation (no cage suffix) identifies the basic execution supplied with a standard pressed-steel cage. The pressed sheet-steel window-type cage is reflected in the published speeds and temperature limits. With C 14.2 kN and C0 13.2 kN, size the bearing on the 25×47 mm ISO 15 envelope and check the 1.4 kN Pu against the equivalent-load floor; the catalogue lists 18,000 r/min thermal reference speed and 18,000 r/min mechanical limiting speed. Assembly note: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. Heat steel rings inductively to max 120 °C.", "applications": [ "motor-cycle and small-engine transmissions", "appliance and fan armature shafts", "small pump rotor shafts", "small industrial electric-motor shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1005, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 1005 and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 12 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 47 mm raceway.", "The 14.2/13.2 kN ratings are SKF catalogue 17000 (2018) values for the basic execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1005?", "a": "SKF NU 1005 is a single-row caged cylindrical roller bearing with 25 mm bore, 47 mm OD and 12 mm width per ISO 15. SKF lists C 14.2 kN, C0 13.2 kN, Pu 1.4 kN, reference speed 18,000 r/min and limiting speed 18,000 r/min, mass about 82 g." }, { "q": "What does the NU designation and plain suffix mean?", "a": "The plain designation (no cage suffix) identifies the basic execution supplied with a standard pressed-steel cage. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU1005 take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU1005 compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU1005-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 25×47×12 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU1005", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU1005", "SKF NU 1005" ], "locale_variants": {} }, { "sku": "NU1006", "brand": "SKF", "manufacturer_designation": "SKF NU 1006", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 30, "D_mm": 55, "B_mm": 13, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 17.9, "static_load_kN": 17.3, "fatigue_load_limit_kN": 1.86, "max_rpm": 15000, "reference_speed_rpm": 15000, "limiting_speed_rpm": 15000, "weight_g": 110, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NU 1006 resolves to a 30×55×13 mm single-row caged cylindrical roller bearing (dimension series 10 (extra-slim OD, normal width)); two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable. Structurally, the NU design has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable. In arrangement terms it is non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. The plain designation (no cage suffix) identifies the basic execution supplied with a standard pressed-steel cage. The pressed sheet-steel window-type cage is reflected in the published speeds and temperature limits. With C 17.9 kN and C0 17.3 kN, size the bearing on the 30×55 mm ISO 15 envelope and check the 1.86 kN Pu against the equivalent-load floor; the catalogue lists 15,000 r/min thermal reference speed and 15,000 r/min mechanical limiting speed. Mounting: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. A 30 mm seat normally takes a k5 interference with an H7 housing bore when the inner ring rotates.", "applications": [ "compressor crank and rotor shafts", "machine-tool radial spindle supports", "conveyor drive-pulley shafts", "medium industrial gearbox shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1006, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 1006 and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 13 mm-wide ring and concentrates load.", "The 17.9/17.3 kN ratings are SKF catalogue 17000 (2018) values for the basic execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1006?", "a": "SKF NU 1006 is a single-row caged cylindrical roller bearing with 30 mm bore, 55 mm OD and 13 mm width per ISO 15. SKF lists C 17.9 kN, C0 17.3 kN, Pu 1.86 kN, reference speed 15,000 r/min and limiting speed 15,000 r/min, mass about 110 g." }, { "q": "What does the NU designation and plain suffix mean?", "a": "The plain designation (no cage suffix) identifies the basic execution supplied with a standard pressed-steel cage. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU1006 take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU1006 compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU1006-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 30×55×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU1006", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU1006", "SKF NU 1006" ], "locale_variants": {} }, { "sku": "NU1007-ECP", "brand": "SKF", "manufacturer_designation": "SKF NU 1007 ECP", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 35, "D_mm": 62, "B_mm": 14, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 35.8, "static_load_kN": 38, "fatigue_load_limit_kN": 4.55, "max_rpm": 13000, "reference_speed_rpm": 13000, "limiting_speed_rpm": 13000, "weight_g": 160, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NU 1007 ECP is a single-row caged cylindrical roller bearing sized 35×62×14 mm — a dimension series 10 (extra-slim OD, normal width), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. The NU configuration means two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable; functionally the bearing is non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Selection arithmetic: C0/C ≈ 1.06 (38 against 35.8 kN), and the Pu figure 4.55 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 13,000 r/min thermal reference speed and 13,000 r/min mechanical limiting speed. Fit practice for NU1007-ECP: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "medium industrial gearbox shafts", "electric-motor shafts in pumps and fans", "compressor crank and rotor shafts", "machine-tool radial spindle supports" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1007, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 1007 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 62 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 62 mm raceway.", "The 35.8/38 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1007-ECP?", "a": "SKF NU 1007 ECP is a single-row caged cylindrical roller bearing with 35 mm bore, 62 mm OD and 14 mm width per ISO 15. SKF lists C 35.8 kN, C0 38 kN, Pu 4.55 kN, reference speed 13,000 r/min and limiting speed 13,000 r/min, mass about 160 g." }, { "q": "What does the NU designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU1007-ECP take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU1007-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU1007", "equiv_brand": "NTN", "level": "partial", "note": "Same 35×62×14 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU1007", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU1007-ECP", "SKF NU 1007 ECP" ], "locale_variants": {} }, { "sku": "NU1008-ML", "brand": "SKF", "manufacturer_designation": "SKF NU 1008 ML", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 40, "D_mm": 68, "B_mm": 15, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 25.1, "static_load_kN": 26, "fatigue_load_limit_kN": 3, "max_rpm": 18000, "reference_speed_rpm": 12000, "limiting_speed_rpm": 18000, "weight_g": 230, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU1008-ML is the 40 mm bore entry in the NU1000 range: a 40×68×15 mm single-row caged cylindrical roller bearing with a one-piece machined brass cage, rated C 25.1 kN / C0 26 kN. The NU configuration means two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable; functionally the bearing is non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. Reading the order-string suffix ML: the basic (non-E) ML execution with a machined brass cage, standard for the larger and earlier-design sizes. Speed planning for NU1008-ML: the catalogue lists 12,000 r/min thermal reference speed and 18,000 r/min mechanical limiting speed. The mass entry 230 g covers the complete catalogue execution. Fit practice for NU1008-ML: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "machine-tool radial spindle supports", "conveyor drive-pulley shafts", "medium industrial gearbox shafts", "electric-motor shafts in pumps and fans" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1008, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 1008 ML and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 68 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 68 mm raceway.", "The 25.1/26 kN ratings are SKF catalogue 17000 (2018) values for the ML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1008-ML?", "a": "SKF NU 1008 ML is a single-row caged cylindrical roller bearing with 40 mm bore, 68 mm OD and 15 mm width per ISO 15. SKF lists C 25.1 kN, C0 26 kN, Pu 3 kN, reference speed 12,000 r/min and limiting speed 18,000 r/min, mass about 230 g." }, { "q": "What does the NU designation and ML suffix mean?", "a": "The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU1008-ML take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU1008-ML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU1008", "equiv_brand": "NTN", "level": "partial", "note": "Same 40×68×15 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU1008", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU1008-ML", "SKF NU 1008 ML" ], "locale_variants": {} }, { "sku": "NU1009-ECP", "brand": "SKF", "manufacturer_designation": "SKF NU 1009 ECP", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 45, "D_mm": 75, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 44.6, "static_load_kN": 52, "fatigue_load_limit_kN": 6.3, "max_rpm": 11000, "reference_speed_rpm": 11000, "limiting_speed_rpm": 11000, "weight_g": 250, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NU 1009 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 45×75×16 mm envelope, dimension series 10 (extra-slim OD, normal width), with catalogue mass 250 g. Structurally, the NU design has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable. In arrangement terms it is non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. With C 44.6 kN and C0 52 kN, size the bearing on the 45×75 mm ISO 15 envelope and check the 6.3 kN Pu against the equivalent-load floor; the catalogue lists 11,000 r/min thermal reference speed and 11,000 r/min mechanical limiting speed. Fit practice for NU1009-ECP: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "compressor crank and rotor shafts", "machine-tool radial spindle supports", "conveyor drive-pulley shafts", "medium industrial gearbox shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1009, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 1009 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 75 mm raceway.", "The 44.6/52 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1009-ECP?", "a": "SKF NU 1009 ECP is a single-row caged cylindrical roller bearing with 45 mm bore, 75 mm OD and 16 mm width per ISO 15. SKF lists C 44.6 kN, C0 52 kN, Pu 6.3 kN, reference speed 11,000 r/min and limiting speed 11,000 r/min, mass about 250 g." }, { "q": "What does the NU designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU1009-ECP take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU1009-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU1009", "equiv_brand": "NTN", "level": "partial", "note": "Same 45×75×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NJ1009-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 45×75×16 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU1009-ECP", "SKF NU 1009 ECP" ], "locale_variants": {} }, { "sku": "NU1010-ECP", "brand": "SKF", "manufacturer_designation": "SKF NU 1010 ECP", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 50, "D_mm": 80, "B_mm": 16, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 46.8, "static_load_kN": 56, "fatigue_load_limit_kN": 6.7, "max_rpm": 9500, "reference_speed_rpm": 9500, "limiting_speed_rpm": 9500, "weight_g": 270, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 50 mm shaft, SKF lists NU1010-ECP as single-row caged cylindrical roller: 80 mm OD, 16 mm wide, Pu 6.7 kN, the catalogue lists 9,500 r/min thermal reference speed and 9,500 r/min mechanical limiting speed. Reading the NU prefix: two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable. This makes the execution non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. Reading the order-string suffix ECP: the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Speed planning for NU1010-ECP: the catalogue lists 9,500 r/min thermal reference speed and 9,500 r/min mechanical limiting speed. The mass entry 270 g covers the complete catalogue execution. Assembly note: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. Heat steel rings inductively to max 120 °C — the PA66 cage sets the ceiling.", "applications": [ "machine-tool radial spindle supports", "conveyor drive-pulley shafts", "medium industrial gearbox shafts", "electric-motor shafts in pumps and fans" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1010, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 1010 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 16 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 16 mm-wide ring and concentrates load.", "The 46.8/56 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1010-ECP?", "a": "SKF NU 1010 ECP is a single-row caged cylindrical roller bearing with 50 mm bore, 80 mm OD and 16 mm width per ISO 15. SKF lists C 46.8 kN, C0 56 kN, Pu 6.7 kN, reference speed 9,500 r/min and limiting speed 9,500 r/min, mass about 270 g." }, { "q": "What does the NU designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU1010-ECP take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU1010-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU1010", "equiv_brand": "NTN", "level": "partial", "note": "Same 50×80×16 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU1010", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU1010-ECP", "SKF NU 1010 ECP" ], "locale_variants": {} }, { "sku": "NU1011-ECP", "brand": "SKF", "manufacturer_designation": "SKF NU 1011 ECP", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 55, "D_mm": 90, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 57.2, "static_load_kN": 69.5, "fatigue_load_limit_kN": 8.3, "max_rpm": 8500, "reference_speed_rpm": 8500, "limiting_speed_rpm": 8500, "weight_g": 390, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NU 1011 ECP is a single-row caged cylindrical roller bearing sized 55×90×18 mm — a dimension series 10 (extra-slim OD, normal width), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. The NU configuration means two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable; functionally the bearing is non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Selection arithmetic: C0/C ≈ 1.22 (69.5 against 57.2 kN), and the Pu figure 8.3 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 8,500 r/min thermal reference speed and 8,500 r/min mechanical limiting speed. Fit practice for NU1011-ECP: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "medium industrial gearbox shafts", "electric-motor shafts in pumps and fans", "compressor crank and rotor shafts", "machine-tool radial spindle supports" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1011, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 1011 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 90 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 18 mm-wide ring and concentrates load.", "The 57.2/69.5 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1011-ECP?", "a": "SKF NU 1011 ECP is a single-row caged cylindrical roller bearing with 55 mm bore, 90 mm OD and 18 mm width per ISO 15. SKF lists C 57.2 kN, C0 69.5 kN, Pu 8.3 kN, reference speed 8,500 r/min and limiting speed 8,500 r/min, mass about 390 g." }, { "q": "What does the NU designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU1011-ECP take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU1011-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU1011", "equiv_brand": "NTN", "level": "partial", "note": "Same 55×90×18 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NJ1011-ECP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 55×90×18 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU1011-ECP", "SKF NU 1011 ECP" ], "locale_variants": {} }, { "sku": "NU1012-ML", "brand": "SKF", "manufacturer_designation": "SKF NU 1012 ML", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 60, "D_mm": 95, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 37.4, "static_load_kN": 44, "fatigue_load_limit_kN": 5.3, "max_rpm": 13000, "reference_speed_rpm": 8000, "limiting_speed_rpm": 13000, "weight_g": 500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU1012-ML is the 60 mm bore entry in the NU1000 range: a 60×95×18 mm single-row caged cylindrical roller bearing with a one-piece machined brass cage, rated C 37.4 kN / C0 44 kN. Structurally, the NU design has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable. In arrangement terms it is non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. The one-piece machined brass cage is reflected in the published speeds and temperature limits. The radial section height is 17.5 mm and the catalogue mass 500 g; at 37.4 kN dynamic rating this is roughly 0.62 kN of C per millimetre of bore before application factors. Fit practice for NU1012-ML: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "large pump and blower rotors", "rolling-mill auxiliary drive shafts", "paper-machine press rolls", "cement-plant conveyor drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1012, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 1012 ML and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 37.4/44 kN ratings are SKF catalogue 17000 (2018) values for the ML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1012-ML?", "a": "SKF NU 1012 ML is a single-row caged cylindrical roller bearing with 60 mm bore, 95 mm OD and 18 mm width per ISO 15. SKF lists C 37.4 kN, C0 44 kN, Pu 5.3 kN, reference speed 8,000 r/min and limiting speed 13,000 r/min, mass about 500 g." }, { "q": "What does the NU designation and ML suffix mean?", "a": "The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU1012-ML take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU1012-ML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU1012", "equiv_brand": "NTN", "level": "partial", "note": "Same 60×95×18 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU1012", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU1012-ML", "SKF NU 1012 ML" ], "locale_variants": {} }, { "sku": "NU1013-ECP", "brand": "SKF", "manufacturer_designation": "SKF NU 1013 ECP", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 100, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 62.7, "static_load_kN": 81.5, "fatigue_load_limit_kN": 9.8, "max_rpm": 7500, "reference_speed_rpm": 7500, "limiting_speed_rpm": 7500, "weight_g": 450, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NU 1013 ECP denotes a single-row caged cylindrical roller bearing on the ISO 15 65×100×18 mm envelope, dimension series 10 (extra-slim OD, normal width), with catalogue mass 450 g. Structurally, the NU design has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable. In arrangement terms it is non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. With C 62.7 kN and C0 81.5 kN, size the bearing on the 65×100 mm ISO 15 envelope and check the 9.8 kN Pu against the equivalent-load floor; the catalogue lists 7,500 r/min thermal reference speed and 7,500 r/min mechanical limiting speed. Fit practice for NU1013-ECP: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "rolling-mill auxiliary drive shafts", "paper-machine press rolls", "cement-plant conveyor drives", "heavy gearbox and pinion shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1013, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 1013 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 18 mm-wide ring and concentrates load.", "The 62.7/81.5 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1013-ECP?", "a": "SKF NU 1013 ECP is a single-row caged cylindrical roller bearing with 65 mm bore, 100 mm OD and 18 mm width per ISO 15. SKF lists C 62.7 kN, C0 81.5 kN, Pu 9.8 kN, reference speed 7,500 r/min and limiting speed 7,500 r/min, mass about 450 g." }, { "q": "What does the NU designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU1013-ECP take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU1013-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU1013", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU1013-ML", "equiv_brand": "SKF", "level": "partial", "note": "Same ISO 15 envelope 65×100×18 mm, but catalogue C/C0 ratings differ between executions (62.7/81.5 vs 38/46.5 kN) and the NU flange/ring configuration differs — envelope match, not a load-rating equivalent." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU1013-ECP", "SKF NU 1013 ECP" ], "locale_variants": {} }, { "sku": "NU1013-ML", "brand": "SKF", "manufacturer_designation": "SKF NU 1013 ML", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 65, "D_mm": 100, "B_mm": 18, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 38, "static_load_kN": 46.5, "fatigue_load_limit_kN": 5.5, "max_rpm": 12000, "reference_speed_rpm": 7500, "limiting_speed_rpm": 12000, "weight_g": 510, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 65 mm shaft, SKF lists NU1013-ML as single-row caged cylindrical roller: 100 mm OD, 18 mm wide, Pu 5.5 kN, the catalogue lists 7,500 r/min thermal reference speed and 12,000 r/min mechanical limiting speed. Structurally, the NU design has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable. In arrangement terms it is non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. The one-piece machined brass cage is reflected in the published speeds and temperature limits. Speed planning for NU1013-ML: the catalogue lists 7,500 r/min thermal reference speed and 12,000 r/min mechanical limiting speed. The mass entry 510 g covers the complete catalogue execution. Assembly note: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. Heat steel rings inductively to max 120 °C.", "applications": [ "paper-machine press rolls", "cement-plant conveyor drives", "heavy gearbox and pinion shafts", "large pump and blower rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1013, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 1013 ML and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 100 mm raceway.", "The 38/46.5 kN ratings are SKF catalogue 17000 (2018) values for the ML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1013-ML?", "a": "SKF NU 1013 ML is a single-row caged cylindrical roller bearing with 65 mm bore, 100 mm OD and 18 mm width per ISO 15. SKF lists C 38 kN, C0 46.5 kN, Pu 5.5 kN, reference speed 7,500 r/min and limiting speed 12,000 r/min, mass about 510 g." }, { "q": "What does the NU designation and ML suffix mean?", "a": "The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU1013-ML take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU1013-ML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU1013", "equiv_brand": "NTN", "level": "partial", "note": "Same 65×100×18 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU1013-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same ISO 15 envelope 65×100×18 mm, but catalogue C/C0 ratings differ between executions (38/46.5 vs 62.7/81.5 kN) and the NU flange/ring configuration differs — envelope match, not a load-rating equivalent." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU1013-ML", "SKF NU 1013 ML" ], "locale_variants": {} }, { "sku": "NU1014-ECP", "brand": "SKF", "manufacturer_designation": "SKF NU 1014 ECP", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 110, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "polymer_PA66", "dynamic_load_kN": 76.5, "static_load_kN": 93, "fatigue_load_limit_kN": 12, "max_rpm": 7000, "reference_speed_rpm": 7000, "limiting_speed_rpm": 7000, "weight_g": 610, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NU 1014 ECP resolves to a 70×110×20 mm single-row caged cylindrical roller bearing (dimension series 10 (extra-slim OD, normal width)); two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable. The NU configuration means two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable; functionally the bearing is non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. The glass-fibre reinforced polyamide (PA66) window-type cage is reflected in the published speeds and temperature limits. Speed planning for NU1014-ECP: the catalogue lists 7,000 r/min thermal reference speed and 7,000 r/min mechanical limiting speed. The mass entry 610 g covers the complete catalogue execution. Mounting: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. A 70 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "paper-machine press rolls", "cement-plant conveyor drives", "heavy gearbox and pinion shafts", "large pump and blower rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "polymer cage softening above 120 °C", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1014, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 1014 ECP and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 110 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 20 mm-wide ring and concentrates load.", "The 76.5/93 kN ratings are SKF catalogue 17000 (2018) values for the ECP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1014-ECP?", "a": "SKF NU 1014 ECP is a single-row caged cylindrical roller bearing with 70 mm bore, 110 mm OD and 20 mm width per ISO 15. SKF lists C 76.5 kN, C0 93 kN, Pu 12 kN, reference speed 7,000 r/min and limiting speed 7,000 r/min, mass about 610 g." }, { "q": "What does the NU designation and ECP suffix mean?", "a": "The ECP suffix marks the E-design execution with a glass-fibre reinforced polyamide (PA66) cage, limited to 120 °C continuous. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU1014-ECP take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU1014-ECP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU1014", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU1014-ML", "equiv_brand": "SKF", "level": "partial", "note": "Same ISO 15 envelope 70×110×20 mm, but catalogue C/C0 ratings differ between executions (76.5/93 vs 56.1/67 kN) and the NU flange/ring configuration differs — envelope match, not a load-rating equivalent." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU1014-ECP", "SKF NU 1014 ECP" ], "locale_variants": {} }, { "sku": "NU1014-ML", "brand": "SKF", "manufacturer_designation": "SKF NU 1014 ML", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 70, "D_mm": 110, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 56.1, "static_load_kN": 67, "fatigue_load_limit_kN": 8, "max_rpm": 11000, "reference_speed_rpm": 7000, "limiting_speed_rpm": 11000, "weight_g": 700, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NU 1014 ML is a single-row caged cylindrical roller bearing sized 70×110×20 mm — a dimension series 10 (extra-slim OD, normal width), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. Structurally, the NU design has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable. In arrangement terms it is non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. Reading the order-string suffix ML: the basic (non-E) ML execution with a machined brass cage, standard for the larger and earlier-design sizes. The radial section height is 20.0 mm and the catalogue mass 700 g; at 56.1 kN dynamic rating this is roughly 0.80 kN of C per millimetre of bore before application factors. Fit practice for NU1014-ML: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "large pump and blower rotors", "rolling-mill auxiliary drive shafts", "paper-machine press rolls", "cement-plant conveyor drives" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1014, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 1014 ML and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 110 mm raceway.", "The 56.1/67 kN ratings are SKF catalogue 17000 (2018) values for the ML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1014-ML?", "a": "SKF NU 1014 ML is a single-row caged cylindrical roller bearing with 70 mm bore, 110 mm OD and 20 mm width per ISO 15. SKF lists C 56.1 kN, C0 67 kN, Pu 8 kN, reference speed 7,000 r/min and limiting speed 11,000 r/min, mass about 700 g." }, { "q": "What does the NU designation and ML suffix mean?", "a": "The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU1014-ML take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU1014-ML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU1014", "equiv_brand": "NTN", "level": "partial", "note": "Same 70×110×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU1014-ECP", "equiv_brand": "SKF", "level": "partial", "note": "Same ISO 15 envelope 70×110×20 mm, but catalogue C/C0 ratings differ between executions (56.1/67 vs 76.5/93 kN) and the NU flange/ring configuration differs — envelope match, not a load-rating equivalent." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU1014-ML", "SKF NU 1014 ML" ], "locale_variants": {} }, { "sku": "NU1015-ML", "brand": "SKF", "manufacturer_designation": "SKF NU 1015 ML", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 75, "D_mm": 115, "B_mm": 20, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 58.3, "static_load_kN": 71, "fatigue_load_limit_kN": 8.5, "max_rpm": 10000, "reference_speed_rpm": 6700, "limiting_speed_rpm": 10000, "weight_g": 750, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NU 1015 ML denotes a single-row caged cylindrical roller bearing on the ISO 15 75×115×20 mm envelope, dimension series 10 (extra-slim OD, normal width), with catalogue mass 750 g. Structurally, the NU design has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable. In arrangement terms it is non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. Reading the order-string suffix ML: the basic (non-E) ML execution with a machined brass cage, standard for the larger and earlier-design sizes. Speed planning for NU1015-ML: the catalogue lists 6,700 r/min thermal reference speed and 10,000 r/min mechanical limiting speed. The mass entry 750 g covers the complete catalogue execution. Assembly note: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. Heat steel rings inductively to max 120 °C.", "applications": [ "paper-machine press rolls", "cement-plant conveyor drives", "heavy gearbox and pinion shafts", "large pump and blower rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1015, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 1015 ML and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 20 mm-wide ring and concentrates load.", "The 58.3/71 kN ratings are SKF catalogue 17000 (2018) values for the ML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1015-ML?", "a": "SKF NU 1015 ML is a single-row caged cylindrical roller bearing with 75 mm bore, 115 mm OD and 20 mm width per ISO 15. SKF lists C 58.3 kN, C0 71 kN, Pu 8.5 kN, reference speed 6,700 r/min and limiting speed 10,000 r/min, mass about 750 g." }, { "q": "What does the NU designation and ML suffix mean?", "a": "The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU1015-ML take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU1015-ML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU1015", "equiv_brand": "NTN", "level": "partial", "note": "Same 75×115×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU1015", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU1015-ML", "SKF NU 1015 ML" ], "locale_variants": {} }, { "sku": "NU1016", "brand": "SKF", "manufacturer_designation": "SKF NU 1016", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 80, "D_mm": 125, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "steel_stamped_J", "dynamic_load_kN": 64.4, "static_load_kN": 78, "fatigue_load_limit_kN": 9.8, "max_rpm": 6300, "reference_speed_rpm": 6300, "limiting_speed_rpm": 6300, "weight_g": 880, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NU 1016 is a single-row caged cylindrical roller bearing sized 80×125×22 mm — a dimension series 10 (extra-slim OD, normal width), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. The NU configuration means two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable; functionally the bearing is non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. The plain designation (no cage suffix) identifies the basic execution supplied with a standard pressed-steel cage. The pressed sheet-steel window-type cage is reflected in the published speeds and temperature limits. Load-per-bore for the 80 mm seat is about 0.81 kN/mm, typical of dimension series 10 (extra-slim OD, normal width); use C0 78 kN for static checks such as crane hook blocks standing under load. Fit practice for NU1016: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "cement-plant conveyor drives", "heavy gearbox and pinion shafts", "large pump and blower rotors", "rolling-mill auxiliary drive shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1016, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 1016 and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 125 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 64.4/78 kN ratings are SKF catalogue 17000 (2018) values for the basic execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1016?", "a": "SKF NU 1016 is a single-row caged cylindrical roller bearing with 80 mm bore, 125 mm OD and 22 mm width per ISO 15. SKF lists C 64.4 kN, C0 78 kN, Pu 9.8 kN, reference speed 6,300 r/min and limiting speed 6,300 r/min, mass about 880 g." }, { "q": "What does the NU designation and plain suffix mean?", "a": "The plain designation (no cage suffix) identifies the basic execution supplied with a standard pressed-steel cage. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU1016 take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU1016 compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU1016-NTN", "equiv_brand": "NTN", "level": "partial", "note": "Same 80×125×22 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NJ1016-ECML", "equiv_brand": "SKF", "level": "partial", "note": "Same ISO 15 envelope 80×125×22 mm, but catalogue C/C0 ratings differ between executions (64.4/78 vs 99/127 kN) and the NJ flange/ring configuration differs — envelope match, not a load-rating equivalent." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU1016", "SKF NU 1016" ], "locale_variants": {} }, { "sku": "NU1017-ML", "brand": "SKF", "manufacturer_designation": "SKF NU 1017 ML", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 85, "D_mm": 130, "B_mm": 22, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 68.2, "static_load_kN": 86.5, "fatigue_load_limit_kN": 10.8, "max_rpm": 9000, "reference_speed_rpm": 6000, "limiting_speed_rpm": 9000, "weight_g": 1050, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU1017-ML is the 85 mm bore entry in the NU1000 range: a 85×130×22 mm single-row caged cylindrical roller bearing with a one-piece machined brass cage, rated C 68.2 kN / C0 86.5 kN. Structurally, the NU design has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable. In arrangement terms it is non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Speed planning for NU1017-ML: the catalogue lists 6,000 r/min thermal reference speed and 9,000 r/min mechanical limiting speed. The mass entry 1050 g covers the complete catalogue execution. Assembly note: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. Heat steel rings inductively to max 120 °C.", "applications": [ "paper-machine press rolls", "cement-plant conveyor drives", "heavy gearbox and pinion shafts", "large pump and blower rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1017, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 1017 ML and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 68.2/86.5 kN ratings are SKF catalogue 17000 (2018) values for the ML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1017-ML?", "a": "SKF NU 1017 ML is a single-row caged cylindrical roller bearing with 85 mm bore, 130 mm OD and 22 mm width per ISO 15. SKF lists C 68.2 kN, C0 86.5 kN, Pu 10.8 kN, reference speed 6,000 r/min and limiting speed 9,000 r/min, mass about 1050 g." }, { "q": "What does the NU designation and ML suffix mean?", "a": "The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU1017-ML take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU1017-ML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU1017", "equiv_brand": "NTN", "level": "partial", "note": "Same 85×130×22 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NJ1017-ML", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 85×130×22 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP1017-ML", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 85×130×22 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU1017-ML", "SKF NU 1017 ML" ], "locale_variants": {} }, { "sku": "NU1018-ML", "brand": "SKF", "manufacturer_designation": "SKF NU 1018 ML", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 90, "D_mm": 140, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 80.9, "static_load_kN": 104, "fatigue_load_limit_kN": 12.7, "max_rpm": 8500, "reference_speed_rpm": 5600, "limiting_speed_rpm": 8500, "weight_g": 1350, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 90 mm shaft, SKF lists NU1018-ML as single-row caged cylindrical roller: 140 mm OD, 24 mm wide, Pu 12.7 kN, the catalogue lists 5,600 r/min thermal reference speed and 8,500 r/min mechanical limiting speed. Structurally, the NU design has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable. In arrangement terms it is non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Selection arithmetic: C0/C ≈ 1.29 (104 against 80.9 kN), and the Pu figure 12.7 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 5,600 r/min thermal reference speed and 8,500 r/min mechanical limiting speed. Mounting: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. A 90 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "heavy gearbox and pinion shafts", "large pump and blower rotors", "rolling-mill auxiliary drive shafts", "paper-machine press rolls" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1018, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 1018 ML and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 140 mm raceway.", "The 80.9/104 kN ratings are SKF catalogue 17000 (2018) values for the ML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1018-ML?", "a": "SKF NU 1018 ML is a single-row caged cylindrical roller bearing with 90 mm bore, 140 mm OD and 24 mm width per ISO 15. SKF lists C 80.9 kN, C0 104 kN, Pu 12.7 kN, reference speed 5,600 r/min and limiting speed 8,500 r/min, mass about 1350 g." }, { "q": "What does the NU designation and ML suffix mean?", "a": "The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU1018-ML take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU1018-ML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU1018", "equiv_brand": "NTN", "level": "partial", "note": "Same 90×140×24 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NJ1018-ML", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 90×140×24 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU1018-ML", "SKF NU 1018 ML" ], "locale_variants": {} }, { "sku": "NU1019-ML", "brand": "SKF", "manufacturer_designation": "SKF NU 1019 ML", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 95, "D_mm": 145, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 84.2, "static_load_kN": 110, "fatigue_load_limit_kN": 13.2, "max_rpm": 8000, "reference_speed_rpm": 5300, "limiting_speed_rpm": 8000, "weight_g": 1450, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NU 1019 ML is a single-row caged cylindrical roller bearing sized 95×145×24 mm — a dimension series 10 (extra-slim OD, normal width), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. Structurally, the NU design has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable. In arrangement terms it is non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. The one-piece machined brass cage is reflected in the published speeds and temperature limits. Speed planning for NU1019-ML: the catalogue lists 5,300 r/min thermal reference speed and 8,000 r/min mechanical limiting speed. The mass entry 1450 g covers the complete catalogue execution. Assembly note: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. Heat steel rings inductively to max 120 °C.", "applications": [ "paper-machine press rolls", "cement-plant conveyor drives", "heavy gearbox and pinion shafts", "large pump and blower rotors" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1019, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 1019 ML and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 145 mm raceway.", "The 84.2/110 kN ratings are SKF catalogue 17000 (2018) values for the ML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1019-ML?", "a": "SKF NU 1019 ML is a single-row caged cylindrical roller bearing with 95 mm bore, 145 mm OD and 24 mm width per ISO 15. SKF lists C 84.2 kN, C0 110 kN, Pu 13.2 kN, reference speed 5,300 r/min and limiting speed 8,000 r/min, mass about 1450 g." }, { "q": "What does the NU designation and ML suffix mean?", "a": "The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU1019-ML take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU1019-ML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU1019", "equiv_brand": "NTN", "level": "partial", "note": "Same 95×145×24 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU1019", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU1019-ML", "SKF NU 1019 ML" ], "locale_variants": {} }, { "sku": "NU1020-ML", "brand": "SKF", "manufacturer_designation": "SKF NU 1020 ML", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 100, "D_mm": 150, "B_mm": 24, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 85.8, "static_load_kN": 114, "fatigue_load_limit_kN": 13.7, "max_rpm": 7500, "reference_speed_rpm": 5000, "limiting_speed_rpm": 7500, "weight_g": 1450, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NU 1020 ML resolves to a 100×150×24 mm single-row caged cylindrical roller bearing (dimension series 10 (extra-slim OD, normal width)); two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable. The NU configuration means two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable; functionally the bearing is non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. The one-piece machined brass cage is reflected in the published speeds and temperature limits. With C 85.8 kN and C0 114 kN, size the bearing on the 100×150 mm ISO 15 envelope and check the 13.7 kN Pu against the equivalent-load floor; the catalogue lists 5,000 r/min thermal reference speed and 7,500 r/min mechanical limiting speed. Mounting: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. A 100 mm seat normally takes a k5 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "rolling-mill auxiliary drive shafts", "paper-machine press rolls", "cement-plant conveyor drives", "heavy gearbox and pinion shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1020, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 1020 ML and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 150 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 24 mm-wide ring and concentrates load.", "The 85.8/114 kN ratings are SKF catalogue 17000 (2018) values for the ML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1020-ML?", "a": "SKF NU 1020 ML is a single-row caged cylindrical roller bearing with 100 mm bore, 150 mm OD and 24 mm width per ISO 15. SKF lists C 85.8 kN, C0 114 kN, Pu 13.7 kN, reference speed 5,000 r/min and limiting speed 7,500 r/min, mass about 1450 g." }, { "q": "What does the NU designation and ML suffix mean?", "a": "The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU1020-ML take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU1020-ML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU1020", "equiv_brand": "NTN", "level": "partial", "note": "Same 100×150×24 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU1020", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU1020-ML", "SKF NU 1020 ML" ], "locale_variants": {} }, { "sku": "NU1021-ML", "brand": "SKF", "manufacturer_designation": "SKF NU 1021 ML", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 105, "D_mm": 160, "B_mm": 26, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 101, "static_load_kN": 137, "fatigue_load_limit_kN": 16, "max_rpm": 7500, "reference_speed_rpm": 4800, "limiting_speed_rpm": 7500, "weight_g": 1900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU1021-ML is the 105 mm bore entry in the NU1000 range: a 105×160×26 mm single-row caged cylindrical roller bearing with a one-piece machined brass cage, rated C 101 kN / C0 137 kN. The NU configuration means two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable; functionally the bearing is non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. Reading the order-string suffix ML: the basic (non-E) ML execution with a machined brass cage, standard for the larger and earlier-design sizes. Selection arithmetic: C0/C ≈ 1.36 (137 against 101 kN), and the Pu figure 16 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 4,800 r/min thermal reference speed and 7,500 r/min mechanical limiting speed. Assembly note: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. Heat steel rings inductively to max 120 °C.", "applications": [ "heavy gearbox and pinion shafts", "large pump and blower rotors", "rolling-mill auxiliary drive shafts", "paper-machine press rolls" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1021, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 1021 ML and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 160 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 26 mm-wide ring and concentrates load.", "The 101/137 kN ratings are SKF catalogue 17000 (2018) values for the ML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1021-ML?", "a": "SKF NU 1021 ML is a single-row caged cylindrical roller bearing with 105 mm bore, 160 mm OD and 26 mm width per ISO 15. SKF lists C 101 kN, C0 137 kN, Pu 16 kN, reference speed 4,800 r/min and limiting speed 7,500 r/min, mass about 1900 g." }, { "q": "What does the NU designation and ML suffix mean?", "a": "The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU1021-ML take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU1021-ML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU1021", "equiv_brand": "NTN", "level": "partial", "note": "Same 105×160×26 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU1021", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU1021-ML", "SKF NU 1021 ML" ], "locale_variants": {} }, { "sku": "NU1022-ML", "brand": "SKF", "manufacturer_designation": "SKF NU 1022 ML", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 110, "D_mm": 170, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 128, "static_load_kN": 166, "fatigue_load_limit_kN": 19.3, "max_rpm": 7000, "reference_speed_rpm": 4500, "limiting_speed_rpm": 7000, "weight_g": 2300, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 110 mm shaft, SKF lists NU1022-ML as single-row caged cylindrical roller: 170 mm OD, 28 mm wide, Pu 19.3 kN, the catalogue lists 4,500 r/min thermal reference speed and 7,000 r/min mechanical limiting speed. The NU configuration means two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable; functionally the bearing is non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. Reading the order-string suffix ML: the basic (non-E) ML execution with a machined brass cage, standard for the larger and earlier-design sizes. With C 128 kN and C0 166 kN, size the bearing on the 110×170 mm ISO 15 envelope and check the 19.3 kN Pu against the equivalent-load floor; the catalogue lists 4,500 r/min thermal reference speed and 7,000 r/min mechanical limiting speed. Mounting: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. A 110 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "rolling-mill auxiliary drive shafts", "paper-machine press rolls", "cement-plant conveyor drives", "heavy gearbox and pinion shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1022, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 1022 ML and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 170 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 128/166 kN ratings are SKF catalogue 17000 (2018) values for the ML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1022-ML?", "a": "SKF NU 1022 ML is a single-row caged cylindrical roller bearing with 110 mm bore, 170 mm OD and 28 mm width per ISO 15. SKF lists C 128 kN, C0 166 kN, Pu 19.3 kN, reference speed 4,500 r/min and limiting speed 7,000 r/min, mass about 2300 g." }, { "q": "What does the NU designation and ML suffix mean?", "a": "The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU1022-ML take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU1022-ML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU1022", "equiv_brand": "NTN", "level": "partial", "note": "Same 110×170×28 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU1022", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU1022-ML", "SKF NU 1022 ML" ], "locale_variants": {} }, { "sku": "NU1024-ML", "brand": "SKF", "manufacturer_designation": "SKF NU 1024 ML", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 120, "D_mm": 180, "B_mm": 28, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 134, "static_load_kN": 183, "fatigue_load_limit_kN": 20.8, "max_rpm": 6300, "reference_speed_rpm": 4000, "limiting_speed_rpm": 6300, "weight_g": 2550, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NU 1024 ML denotes a single-row caged cylindrical roller bearing on the ISO 15 120×180×28 mm envelope, dimension series 10 (extra-slim OD, normal width), with catalogue mass 2550 g. The NU configuration means two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable; functionally the bearing is non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. With C 134 kN and C0 183 kN, size the bearing on the 120×180 mm ISO 15 envelope and check the 20.8 kN Pu against the equivalent-load floor; the catalogue lists 4,000 r/min thermal reference speed and 6,300 r/min mechanical limiting speed. Mounting: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. A 120 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "heavy turbogenerator rotor supports", "mining hoist and winder shafts", "offshore drawworks shafts", "large rolling-mill drive trains" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1024, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 1024 ML and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 180 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 180 mm raceway.", "The 134/183 kN ratings are SKF catalogue 17000 (2018) values for the ML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1024-ML?", "a": "SKF NU 1024 ML is a single-row caged cylindrical roller bearing with 120 mm bore, 180 mm OD and 28 mm width per ISO 15. SKF lists C 134 kN, C0 183 kN, Pu 20.8 kN, reference speed 4,000 r/min and limiting speed 6,300 r/min, mass about 2550 g." }, { "q": "What does the NU designation and ML suffix mean?", "a": "The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU1024-ML take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU1024-ML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU1024", "equiv_brand": "NTN", "level": "partial", "note": "Same 120×180×28 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU1024", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU1024-ML", "SKF NU 1024 ML" ], "locale_variants": {} }, { "sku": "NU1026-ML", "brand": "SKF", "manufacturer_designation": "SKF NU 1026 ML", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 130, "D_mm": 200, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 165, "static_load_kN": 224, "fatigue_load_limit_kN": 25, "max_rpm": 5600, "reference_speed_rpm": 3800, "limiting_speed_rpm": 5600, "weight_g": 3850, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU1026-ML is the 130 mm bore entry in the NU1000 range: a 130×200×33 mm single-row caged cylindrical roller bearing with a one-piece machined brass cage, rated C 165 kN / C0 224 kN. The NU configuration means two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable; functionally the bearing is non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. The one-piece machined brass cage is reflected in the published speeds and temperature limits. With C 165 kN and C0 224 kN, size the bearing on the 130×200 mm ISO 15 envelope and check the 25 kN Pu against the equivalent-load floor; the catalogue lists 3,800 r/min thermal reference speed and 5,600 r/min mechanical limiting speed. Mounting: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. A 130 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "heavy turbogenerator rotor supports", "mining hoist and winder shafts", "offshore drawworks shafts", "large rolling-mill drive trains" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1026, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 1026 ML and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 200 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 33 mm-wide ring and concentrates load.", "The 165/224 kN ratings are SKF catalogue 17000 (2018) values for the ML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1026-ML?", "a": "SKF NU 1026 ML is a single-row caged cylindrical roller bearing with 130 mm bore, 200 mm OD and 33 mm width per ISO 15. SKF lists C 165 kN, C0 224 kN, Pu 25 kN, reference speed 3,800 r/min and limiting speed 5,600 r/min, mass about 3850 g." }, { "q": "What does the NU designation and ML suffix mean?", "a": "The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU1026-ML take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU1026-ML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU1026", "equiv_brand": "NTN", "level": "partial", "note": "Same 130×200×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NJ1026-ML", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 130×200×33 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU1026-ML", "SKF NU 1026 ML" ], "locale_variants": {} }, { "sku": "NU1028-ML", "brand": "SKF", "manufacturer_designation": "SKF NU 1028 ML", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 140, "D_mm": 210, "B_mm": 33, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 179, "static_load_kN": 255, "fatigue_load_limit_kN": 28, "max_rpm": 5300, "reference_speed_rpm": 3600, "limiting_speed_rpm": 5300, "weight_g": 4050, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NU 1028 ML is a single-row caged cylindrical roller bearing sized 140×210×33 mm — a dimension series 10 (extra-slim OD, normal width), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. The NU configuration means two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable; functionally the bearing is non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. The one-piece machined brass cage is reflected in the published speeds and temperature limits. The radial section height is 35.0 mm and the catalogue mass 4050 g; at 179 kN dynamic rating this is roughly 1.28 kN of C per millimetre of bore before application factors. Assembly note: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. Heat steel rings inductively to max 120 °C.", "applications": [ "marine propulsion line shafts", "heavy turbogenerator rotor supports", "mining hoist and winder shafts", "offshore drawworks shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1028, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 1028 ML and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 210 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 210 mm raceway.", "The 179/255 kN ratings are SKF catalogue 17000 (2018) values for the ML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1028-ML?", "a": "SKF NU 1028 ML is a single-row caged cylindrical roller bearing with 140 mm bore, 210 mm OD and 33 mm width per ISO 15. SKF lists C 179 kN, C0 255 kN, Pu 28 kN, reference speed 3,600 r/min and limiting speed 5,300 r/min, mass about 4050 g." }, { "q": "What does the NU designation and ML suffix mean?", "a": "The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU1028-ML take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU1028-ML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU1028", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "NU1028", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU1028-ML", "SKF NU 1028 ML" ], "locale_variants": {} }, { "sku": "NU1030-ML", "brand": "SKF", "manufacturer_designation": "SKF NU 1030 ML", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 150, "D_mm": 225, "B_mm": 35, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 198, "static_load_kN": 290, "fatigue_load_limit_kN": 31.5, "max_rpm": 5000, "reference_speed_rpm": 3200, "limiting_speed_rpm": 5000, "weight_g": 4900, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NU 1030 ML resolves to a 150×225×35 mm single-row caged cylindrical roller bearing (dimension series 10 (extra-slim OD, normal width)); two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable. Reading the NU prefix: two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable. This makes the execution non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Speed planning for NU1030-ML: the catalogue lists 3,200 r/min thermal reference speed and 5,000 r/min mechanical limiting speed. The mass entry 4900 g covers the complete catalogue execution. Fit practice for NU1030-ML: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "mining hoist and winder shafts", "offshore drawworks shafts", "large rolling-mill drive trains", "marine propulsion line shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1030, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 1030 ML and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 35 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 35 mm-wide ring and concentrates load.", "The 198/290 kN ratings are SKF catalogue 17000 (2018) values for the ML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1030-ML?", "a": "SKF NU 1030 ML is a single-row caged cylindrical roller bearing with 150 mm bore, 225 mm OD and 35 mm width per ISO 15. SKF lists C 198 kN, C0 290 kN, Pu 31.5 kN, reference speed 3,200 r/min and limiting speed 5,000 r/min, mass about 4900 g." }, { "q": "What does the NU designation and ML suffix mean?", "a": "The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU1030-ML take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU1030-ML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU1030", "equiv_brand": "NTN", "level": "partial", "note": "Same 150×225×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU1030", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU1030-ML", "SKF NU 1030 ML" ], "locale_variants": {} }, { "sku": "NU1032-ML", "brand": "SKF", "manufacturer_designation": "SKF NU 1032 ML", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 160, "D_mm": 240, "B_mm": 38, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 229, "static_load_kN": 325, "fatigue_load_limit_kN": 35.5, "max_rpm": 4800, "reference_speed_rpm": 3000, "limiting_speed_rpm": 4800, "weight_g": 6000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 160 mm shaft, SKF lists NU1032-ML as single-row caged cylindrical roller: 240 mm OD, 38 mm wide, Pu 35.5 kN, the catalogue lists 3,000 r/min thermal reference speed and 4,800 r/min mechanical limiting speed. Reading the NU prefix: two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable. This makes the execution non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. The one-piece machined brass cage is reflected in the published speeds and temperature limits. Speed planning for NU1032-ML: the catalogue lists 3,000 r/min thermal reference speed and 4,800 r/min mechanical limiting speed. The mass entry 6000 g covers the complete catalogue execution. Fit practice for NU1032-ML: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "mining hoist and winder shafts", "offshore drawworks shafts", "large rolling-mill drive trains", "marine propulsion line shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1032, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 1032 ML and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 38 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 229/325 kN ratings are SKF catalogue 17000 (2018) values for the ML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1032-ML?", "a": "SKF NU 1032 ML is a single-row caged cylindrical roller bearing with 160 mm bore, 240 mm OD and 38 mm width per ISO 15. SKF lists C 229 kN, C0 325 kN, Pu 35.5 kN, reference speed 3,000 r/min and limiting speed 4,800 r/min, mass about 6000 g." }, { "q": "What does the NU designation and ML suffix mean?", "a": "The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU1032-ML take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU1032-ML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU1032", "equiv_brand": "NTN", "level": "partial", "note": "Same 160×240×38 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU1032", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU1032-ML", "SKF NU 1032 ML" ], "locale_variants": {} }, { "sku": "NU1034-ML", "brand": "SKF", "manufacturer_designation": "SKF NU 1034 ML", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 170, "D_mm": 260, "B_mm": 42, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 275, "static_load_kN": 400, "fatigue_load_limit_kN": 41.5, "max_rpm": 4300, "reference_speed_rpm": 2800, "limiting_speed_rpm": 4300, "weight_g": 8000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NU 1034 ML denotes a single-row caged cylindrical roller bearing on the ISO 15 170×260×42 mm envelope, dimension series 10 (extra-slim OD, normal width), with catalogue mass 8000 g. Reading the NU prefix: two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable. This makes the execution non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. Reading the order-string suffix ML: the basic (non-E) ML execution with a machined brass cage, standard for the larger and earlier-design sizes. Speed planning for NU1034-ML: the catalogue lists 2,800 r/min thermal reference speed and 4,300 r/min mechanical limiting speed. The mass entry 8000 g covers the complete catalogue execution. Fit practice for NU1034-ML: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "mining hoist and winder shafts", "offshore drawworks shafts", "large rolling-mill drive trains", "marine propulsion line shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1034, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 1034 ML and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 42 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 260 mm raceway.", "The 275/400 kN ratings are SKF catalogue 17000 (2018) values for the ML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1034-ML?", "a": "SKF NU 1034 ML is a single-row caged cylindrical roller bearing with 170 mm bore, 260 mm OD and 42 mm width per ISO 15. SKF lists C 275 kN, C0 400 kN, Pu 41.5 kN, reference speed 2,800 r/min and limiting speed 4,300 r/min, mass about 8000 g." }, { "q": "What does the NU designation and ML suffix mean?", "a": "The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU1034-ML take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU1034-ML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU1034", "equiv_brand": "NTN", "level": "partial", "note": "Same 170×260×42 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NJ1034-ML", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 170×260×42 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU1034-ML", "SKF NU 1034 ML" ], "locale_variants": {} }, { "sku": "NU1036-ML", "brand": "SKF", "manufacturer_designation": "SKF NU 1036 ML", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 180, "D_mm": 280, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 336, "static_load_kN": 475, "fatigue_load_limit_kN": 51, "max_rpm": 4000, "reference_speed_rpm": 2600, "limiting_speed_rpm": 4000, "weight_g": 10500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU1036-ML is the 180 mm bore entry in the NU1000 range: a 180×280×46 mm single-row caged cylindrical roller bearing with a one-piece machined brass cage, rated C 336 kN / C0 475 kN. Reading the NU prefix: two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable. This makes the execution non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. Reading the order-string suffix ML: the basic (non-E) ML execution with a machined brass cage, standard for the larger and earlier-design sizes. With C 336 kN and C0 475 kN, size the bearing on the 180×280 mm ISO 15 envelope and check the 51 kN Pu against the equivalent-load floor; the catalogue lists 2,600 r/min thermal reference speed and 4,000 r/min mechanical limiting speed. Mounting: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. A 180 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "heavy turbogenerator rotor supports", "mining hoist and winder shafts", "offshore drawworks shafts", "large rolling-mill drive trains" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1036, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 1036 ML and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 46 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 336/475 kN ratings are SKF catalogue 17000 (2018) values for the ML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1036-ML?", "a": "SKF NU 1036 ML is a single-row caged cylindrical roller bearing with 180 mm bore, 280 mm OD and 46 mm width per ISO 15. SKF lists C 336 kN, C0 475 kN, Pu 51 kN, reference speed 2,600 r/min and limiting speed 4,000 r/min, mass about 10500 g." }, { "q": "What does the NU designation and ML suffix mean?", "a": "The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU1036-ML take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU1036-ML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU1036", "equiv_brand": "NTN", "level": "partial", "note": "Same 180×280×46 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NJ1036-ML", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 180×280×46 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU1036-ML", "SKF NU 1036 ML" ], "locale_variants": {} }, { "sku": "NU1038-ML", "brand": "SKF", "manufacturer_designation": "SKF NU 1038 ML", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 190, "D_mm": 290, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 347, "static_load_kN": 500, "fatigue_load_limit_kN": 53, "max_rpm": 3800, "reference_speed_rpm": 2600, "limiting_speed_rpm": 3800, "weight_g": 11000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NU 1038 ML is a single-row caged cylindrical roller bearing sized 190×290×46 mm — a dimension series 10 (extra-slim OD, normal width), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. Reading the NU prefix: two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable. This makes the execution non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. With C 347 kN and C0 500 kN, size the bearing on the 190×290 mm ISO 15 envelope and check the 53 kN Pu against the equivalent-load floor; the catalogue lists 2,600 r/min thermal reference speed and 3,800 r/min mechanical limiting speed. Mounting: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. A 190 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "heavy turbogenerator rotor supports", "mining hoist and winder shafts", "offshore drawworks shafts", "large rolling-mill drive trains" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1038, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 1038 ML and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 46 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 290 mm raceway.", "The 347/500 kN ratings are SKF catalogue 17000 (2018) values for the ML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1038-ML?", "a": "SKF NU 1038 ML is a single-row caged cylindrical roller bearing with 190 mm bore, 290 mm OD and 46 mm width per ISO 15. SKF lists C 347 kN, C0 500 kN, Pu 53 kN, reference speed 2,600 r/min and limiting speed 3,800 r/min, mass about 11000 g." }, { "q": "What does the NU designation and ML suffix mean?", "a": "The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU1038-ML take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU1038-ML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU1038", "equiv_brand": "NTN", "level": "partial", "note": "Same 190×290×46 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NJ1038-ML", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 190×290×46 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU1038-ML", "SKF NU 1038 ML" ], "locale_variants": {} }, { "sku": "NU1040-ML", "brand": "SKF", "manufacturer_designation": "SKF NU 1040 ML", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 200, "D_mm": 310, "B_mm": 51, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 380, "static_load_kN": 570, "fatigue_load_limit_kN": 58.5, "max_rpm": 3600, "reference_speed_rpm": 2400, "limiting_speed_rpm": 3600, "weight_g": 14000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU1040-ML is the 200 mm bore entry in the NU1000 range: a 200×310×51 mm single-row caged cylindrical roller bearing with a one-piece machined brass cage, rated C 380 kN / C0 570 kN. Structurally, the NU design has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable. In arrangement terms it is non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. The one-piece machined brass cage is reflected in the published speeds and temperature limits. Load-per-bore for the 200 mm seat is about 1.90 kN/mm, typical of dimension series 10 (extra-slim OD, normal width); use C0 570 kN for static checks such as crane hook blocks standing under load. Mounting: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. A 200 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "offshore drawworks shafts", "large rolling-mill drive trains", "marine propulsion line shafts", "heavy turbogenerator rotor supports" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1040, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 1040 ML and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 51 mm-wide ring and concentrates load.", "The 380/570 kN ratings are SKF catalogue 17000 (2018) values for the ML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1040-ML?", "a": "SKF NU 1040 ML is a single-row caged cylindrical roller bearing with 200 mm bore, 310 mm OD and 51 mm width per ISO 15. SKF lists C 380 kN, C0 570 kN, Pu 58.5 kN, reference speed 2,400 r/min and limiting speed 3,600 r/min, mass about 14000 g." }, { "q": "What does the NU designation and ML suffix mean?", "a": "The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU1040-ML take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU1040-ML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU1040", "equiv_brand": "NTN", "level": "partial", "note": "Same 200×310×51 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU1040", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU1040-ML", "SKF NU 1040 ML" ], "locale_variants": {} }, { "sku": "NU1044-ML", "brand": "SKF", "manufacturer_designation": "SKF NU 1044 ML", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 220, "D_mm": 340, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 495, "static_load_kN": 735, "fatigue_load_limit_kN": 73.5, "max_rpm": 3200, "reference_speed_rpm": 2200, "limiting_speed_rpm": 3200, "weight_g": 18500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NU 1044 ML resolves to a 220×340×56 mm single-row caged cylindrical roller bearing (dimension series 10 (extra-slim OD, normal width)); two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable. Structurally, the NU design has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable. In arrangement terms it is non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Load-per-bore for the 220 mm seat is about 2.25 kN/mm, typical of dimension series 10 (extra-slim OD, normal width); use C0 735 kN for static checks such as crane hook blocks standing under load. Mounting: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. A 220 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "offshore drawworks shafts", "large rolling-mill drive trains", "marine propulsion line shafts", "heavy turbogenerator rotor supports" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1044, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 1044 ML and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 340 mm raceway.", "The 495/735 kN ratings are SKF catalogue 17000 (2018) values for the ML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1044-ML?", "a": "SKF NU 1044 ML is a single-row caged cylindrical roller bearing with 220 mm bore, 340 mm OD and 56 mm width per ISO 15. SKF lists C 495 kN, C0 735 kN, Pu 73.5 kN, reference speed 2,200 r/min and limiting speed 3,200 r/min, mass about 18500 g." }, { "q": "What does the NU designation and ML suffix mean?", "a": "The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU1044-ML take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU1044-ML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU1044", "equiv_brand": "NTN", "level": "partial", "note": "Same 220×340×56 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NJ1044-ML", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 220×340×56 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU1044-ML", "SKF NU 1044 ML" ], "locale_variants": {} }, { "sku": "NU1048-ML", "brand": "SKF", "manufacturer_designation": "SKF NU 1048 ML", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 240, "D_mm": 360, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 523, "static_load_kN": 800, "fatigue_load_limit_kN": 78, "max_rpm": 3000, "reference_speed_rpm": 2000, "limiting_speed_rpm": 3000, "weight_g": 19500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NU 1048 ML denotes a single-row caged cylindrical roller bearing on the ISO 15 240×360×56 mm envelope, dimension series 10 (extra-slim OD, normal width), with catalogue mass 19500 g. Structurally, the NU design has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable. In arrangement terms it is non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. The one-piece machined brass cage is reflected in the published speeds and temperature limits. Speed planning for NU1048-ML: the catalogue lists 2,000 r/min thermal reference speed and 3,000 r/min mechanical limiting speed. The mass entry 19500 g covers the complete catalogue execution. Assembly note: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. Heat steel rings inductively to max 120 °C.", "applications": [ "mining hoist and winder shafts", "offshore drawworks shafts", "large rolling-mill drive trains", "marine propulsion line shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1048, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 1048 ML and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 360 mm raceway.", "The 523/800 kN ratings are SKF catalogue 17000 (2018) values for the ML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1048-ML?", "a": "SKF NU 1048 ML is a single-row caged cylindrical roller bearing with 240 mm bore, 360 mm OD and 56 mm width per ISO 15. SKF lists C 523 kN, C0 800 kN, Pu 78 kN, reference speed 2,000 r/min and limiting speed 3,000 r/min, mass about 19500 g." }, { "q": "What does the NU designation and ML suffix mean?", "a": "The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU1048-ML take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU1048-ML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU1048", "equiv_brand": "NTN", "level": "partial", "note": "Same 240×360×56 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NU1048", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU1048-ML", "SKF NU 1048 ML" ], "locale_variants": {} }, { "sku": "NU1052-ML", "brand": "SKF", "manufacturer_designation": "SKF NU 1052 ML", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 260, "D_mm": 400, "B_mm": 65, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 627, "static_load_kN": 965, "fatigue_load_limit_kN": 96.5, "max_rpm": 2800, "reference_speed_rpm": 1800, "limiting_speed_rpm": 2800, "weight_g": 29500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NU 1052 ML denotes a single-row caged cylindrical roller bearing on the ISO 15 260×400×65 mm envelope, dimension series 10 (extra-slim OD, normal width), with catalogue mass 29500 g. Reading the NU prefix: two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable. This makes the execution non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. The radial section height is 70.0 mm and the catalogue mass 29500 g; at 627 kN dynamic rating this is roughly 2.41 kN of C per millimetre of bore before application factors. Assembly note: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. Heat steel rings inductively to max 120 °C.", "applications": [ "marine propulsion line shafts", "heavy turbogenerator rotor supports", "mining hoist and winder shafts", "offshore drawworks shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1052, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 1052 ML and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 65 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 627/965 kN ratings are SKF catalogue 17000 (2018) values for the ML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1052-ML?", "a": "SKF NU 1052 ML is a single-row caged cylindrical roller bearing with 260 mm bore, 400 mm OD and 65 mm width per ISO 15. SKF lists C 627 kN, C0 965 kN, Pu 96.5 kN, reference speed 1,800 r/min and limiting speed 2,800 r/min, mass about 29500 g." }, { "q": "What does the NU designation and ML suffix mean?", "a": "The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU1052-ML take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU1052-ML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU1052", "equiv_brand": "NTN", "level": "partial", "note": "Same 260×400×65 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting." }, { "equiv_sku": "NJ1052-ML", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 260×400×65 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU1052-ML", "SKF NU 1052 ML" ], "locale_variants": {} }, { "sku": "NU1056-ML", "brand": "SKF", "manufacturer_designation": "SKF NU 1056 ML", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 280, "D_mm": 420, "B_mm": 65, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 660, "static_load_kN": 1060, "fatigue_load_limit_kN": 102, "max_rpm": 2600, "reference_speed_rpm": 1700, "limiting_speed_rpm": 2600, "weight_g": 31000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NU 1056 ML is a single-row caged cylindrical roller bearing sized 280×420×65 mm — a dimension series 10 (extra-slim OD, normal width), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. The NU configuration means two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable; functionally the bearing is non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. The one-piece machined brass cage is reflected in the published speeds and temperature limits. Load-per-bore for the 280 mm seat is about 2.36 kN/mm, typical of dimension series 10 (extra-slim OD, normal width); use C0 1060 kN for static checks such as crane hook blocks standing under load. Fit practice for NU1056-ML: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "offshore drawworks shafts", "large rolling-mill drive trains", "marine propulsion line shafts", "heavy turbogenerator rotor supports" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1056, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 1056 ML and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 420 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 660/1060 kN ratings are SKF catalogue 17000 (2018) values for the ML execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1056-ML?", "a": "SKF NU 1056 ML is a single-row caged cylindrical roller bearing with 280 mm bore, 420 mm OD and 65 mm width per ISO 15. SKF lists C 660 kN, C0 1060 kN, Pu 102 kN, reference speed 1,700 r/min and limiting speed 2,600 r/min, mass about 31000 g." }, { "q": "What does the NU designation and ML suffix mean?", "a": "The ML suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU1056-ML take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU1056-ML compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU1056", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "NU1056", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU1056-ML", "SKF NU 1056 ML" ], "locale_variants": {} }, { "sku": "NU1060-MA", "brand": "SKF", "manufacturer_designation": "SKF NU 1060 MA", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 300, "D_mm": 460, "B_mm": 74, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 858, "static_load_kN": 1370, "fatigue_load_limit_kN": 129, "max_rpm": 2000, "reference_speed_rpm": 1500, "limiting_speed_rpm": 2000, "weight_g": 46000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NU 1060 MA denotes a single-row caged cylindrical roller bearing on the ISO 15 300×460×74 mm envelope, dimension series 10 (extra-slim OD, normal width), with catalogue mass 46000 g. The NU configuration means two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable; functionally the bearing is non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. The one-piece machined brass cage is reflected in the published speeds and temperature limits. With C 858 kN and C0 1370 kN, size the bearing on the 300×460 mm ISO 15 envelope and check the 129 kN Pu against the equivalent-load floor; the catalogue lists 1,500 r/min thermal reference speed and 2,000 r/min mechanical limiting speed. Fit practice for NU1060-MA: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "heavy turbogenerator rotor supports", "mining hoist and winder shafts", "offshore drawworks shafts", "large rolling-mill drive trains" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1060, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 1060 MA and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 460 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 858/1370 kN ratings are SKF catalogue 17000 (2018) values for the MA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1060-MA?", "a": "SKF NU 1060 MA is a single-row caged cylindrical roller bearing with 300 mm bore, 460 mm OD and 74 mm width per ISO 15. SKF lists C 858 kN, C0 1370 kN, Pu 129 kN, reference speed 1,500 r/min and limiting speed 2,000 r/min, mass about 46000 g." }, { "q": "What does the NU designation and MA suffix mean?", "a": "The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU1060-MA take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU1060-MA compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU1060", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "NJ1060-MA", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 300×460×74 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU1060-MA", "SKF NU 1060 MA" ], "locale_variants": {} }, { "sku": "NU1064-MA", "brand": "SKF", "manufacturer_designation": "SKF NU 1064 MA", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 320, "D_mm": 480, "B_mm": 74, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 880, "static_load_kN": 1430, "fatigue_load_limit_kN": 132, "max_rpm": 1400, "reference_speed_rpm": 1400, "limiting_speed_rpm": 1400, "weight_g": 48500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NU 1064 MA is a single-row caged cylindrical roller bearing sized 320×480×74 mm — a dimension series 10 (extra-slim OD, normal width), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. The NU configuration means two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable; functionally the bearing is non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. With C 880 kN and C0 1430 kN, size the bearing on the 320×480 mm ISO 15 envelope and check the 132 kN Pu against the equivalent-load floor; the catalogue lists 1,400 r/min thermal reference speed and 1,400 r/min mechanical limiting speed. Fit practice for NU1064-MA: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "heavy turbogenerator rotor supports", "mining hoist and winder shafts", "offshore drawworks shafts", "large rolling-mill drive trains" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1064, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 1064 MA and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 480 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 74 mm-wide ring and concentrates load.", "The 880/1430 kN ratings are SKF catalogue 17000 (2018) values for the MA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1064-MA?", "a": "SKF NU 1064 MA is a single-row caged cylindrical roller bearing with 320 mm bore, 480 mm OD and 74 mm width per ISO 15. SKF lists C 880 kN, C0 1430 kN, Pu 132 kN, reference speed 1,400 r/min and limiting speed 1,400 r/min, mass about 48500 g." }, { "q": "What does the NU designation and MA suffix mean?", "a": "The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU1064-MA take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU1064-MA compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU1064", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "NJ1064-MA", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 320×480×74 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU1064-MA", "SKF NU 1064 MA" ], "locale_variants": {} }, { "sku": "NU1072-MA", "brand": "SKF", "manufacturer_designation": "SKF NU 1072 MA", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 360, "D_mm": 540, "B_mm": 82, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 1100, "static_load_kN": 1830, "fatigue_load_limit_kN": 163, "max_rpm": 1600, "reference_speed_rpm": 1300, "limiting_speed_rpm": 1600, "weight_g": 67500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 360 mm shaft, SKF lists NU1072-MA as single-row caged cylindrical roller: 540 mm OD, 82 mm wide, Pu 163 kN, the catalogue lists 1,300 r/min thermal reference speed and 1,600 r/min mechanical limiting speed. Reading the NU prefix: two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable. This makes the execution non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Speed planning for NU1072-MA: the catalogue lists 1,300 r/min thermal reference speed and 1,600 r/min mechanical limiting speed. The mass entry 67500 g covers the complete catalogue execution. Mounting: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. A 360 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "mining hoist and winder shafts", "offshore drawworks shafts", "large rolling-mill drive trains", "marine propulsion line shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "rolling-contact fatigue spalling after the rated L10 life is exceeded" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1072, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 1072 MA and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 82 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 540 mm raceway.", "The 1100/1830 kN ratings are SKF catalogue 17000 (2018) values for the MA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1072-MA?", "a": "SKF NU 1072 MA is a single-row caged cylindrical roller bearing with 360 mm bore, 540 mm OD and 82 mm width per ISO 15. SKF lists C 1100 kN, C0 1830 kN, Pu 163 kN, reference speed 1,300 r/min and limiting speed 1,600 r/min, mass about 67500 g." }, { "q": "What does the NU designation and MA suffix mean?", "a": "The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU1072-MA take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU1072-MA compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU1072", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "NU1072", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU1072-MA", "SKF NU 1072 MA" ], "locale_variants": {} }, { "sku": "NU1076-MA", "brand": "SKF", "manufacturer_designation": "SKF NU 1076 MA", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 380, "D_mm": 560, "B_mm": 82, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 1140, "static_load_kN": 1930, "fatigue_load_limit_kN": 170, "max_rpm": 1600, "reference_speed_rpm": 1200, "limiting_speed_rpm": 1600, "weight_g": 70000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU1076-MA is the 380 mm bore entry in the NU1000 range: a 380×560×82 mm single-row caged cylindrical roller bearing with a one-piece machined brass cage, rated C 1140 kN / C0 1930 kN. Reading the NU prefix: two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable. This makes the execution non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. The one-piece machined brass cage is reflected in the published speeds and temperature limits. With C 1140 kN and C0 1930 kN, size the bearing on the 380×560 mm ISO 15 envelope and check the 170 kN Pu against the equivalent-load floor; the catalogue lists 1,200 r/min thermal reference speed and 1,600 r/min mechanical limiting speed. Assembly note: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. Heat steel rings inductively to max 120 °C.", "applications": [ "heavy turbogenerator rotor supports", "mining hoist and winder shafts", "offshore drawworks shafts", "large rolling-mill drive trains" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1076, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 1076 MA and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 82 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 560 mm raceway.", "The 1140/1930 kN ratings are SKF catalogue 17000 (2018) values for the MA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1076-MA?", "a": "SKF NU 1076 MA is a single-row caged cylindrical roller bearing with 380 mm bore, 560 mm OD and 82 mm width per ISO 15. SKF lists C 1140 kN, C0 1930 kN, Pu 170 kN, reference speed 1,200 r/min and limiting speed 1,600 r/min, mass about 70000 g." }, { "q": "What does the NU designation and MA suffix mean?", "a": "The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU1076-MA take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU1076-MA compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU1076", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "NJ1076-MA", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 380×560×82 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU1076-MA", "SKF NU 1076 MA" ], "locale_variants": {} }, { "sku": "NU1080-MA", "brand": "SKF", "manufacturer_designation": "SKF NU 1080 MA", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 400, "D_mm": 600, "B_mm": 90, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 1380, "static_load_kN": 2320, "fatigue_load_limit_kN": 196, "max_rpm": 1500, "reference_speed_rpm": 1100, "limiting_speed_rpm": 1500, "weight_g": 90000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NU 1080 MA resolves to a 400×600×90 mm single-row caged cylindrical roller bearing (dimension series 10 (extra-slim OD, normal width)); two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable. Structurally, the NU design has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable. In arrangement terms it is non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. The one-piece machined brass cage is reflected in the published speeds and temperature limits. Load-per-bore for the 400 mm seat is about 3.45 kN/mm, typical of dimension series 10 (extra-slim OD, normal width); use C0 2320 kN for static checks such as crane hook blocks standing under load. Fit practice for NU1080-MA: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "offshore drawworks shafts", "large rolling-mill drive trains", "marine propulsion line shafts", "heavy turbogenerator rotor supports" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1080, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 1080 MA and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 1380/2320 kN ratings are SKF catalogue 17000 (2018) values for the MA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1080-MA?", "a": "SKF NU 1080 MA is a single-row caged cylindrical roller bearing with 400 mm bore, 600 mm OD and 90 mm width per ISO 15. SKF lists C 1380 kN, C0 2320 kN, Pu 196 kN, reference speed 1,100 r/min and limiting speed 1,500 r/min, mass about 90000 g." }, { "q": "What does the NU designation and MA suffix mean?", "a": "The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU1080-MA take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU1080-MA compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU1080", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "NJ1080-MA", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 400×600×90 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU1080-MA", "SKF NU 1080 MA" ], "locale_variants": {} }, { "sku": "NU1084-MA", "brand": "SKF", "manufacturer_designation": "SKF NU 1084 MA", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 420, "D_mm": 620, "B_mm": 90, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 1420, "static_load_kN": 2450, "fatigue_load_limit_kN": 200, "max_rpm": 1400, "reference_speed_rpm": 1100, "limiting_speed_rpm": 1400, "weight_g": 94000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NU 1084 MA denotes a single-row caged cylindrical roller bearing on the ISO 15 420×620×90 mm envelope, dimension series 10 (extra-slim OD, normal width), with catalogue mass 94000 g. Structurally, the NU design has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable. In arrangement terms it is non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Load-per-bore for the 420 mm seat is about 3.38 kN/mm, typical of dimension series 10 (extra-slim OD, normal width); use C0 2450 kN for static checks such as crane hook blocks standing under load. Fit practice for NU1084-MA: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "offshore drawworks shafts", "large rolling-mill drive trains", "marine propulsion line shafts", "heavy turbogenerator rotor supports" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1084, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 1084 MA and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 90 mm-wide ring and concentrates load.", "The 1420/2450 kN ratings are SKF catalogue 17000 (2018) values for the MA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1084-MA?", "a": "SKF NU 1084 MA is a single-row caged cylindrical roller bearing with 420 mm bore, 620 mm OD and 90 mm width per ISO 15. SKF lists C 1420 kN, C0 2450 kN, Pu 200 kN, reference speed 1,100 r/min and limiting speed 1,400 r/min, mass about 94000 g." }, { "q": "What does the NU designation and MA suffix mean?", "a": "The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU1084-MA take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU1084-MA compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU1084", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "NU1084", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU1084-MA", "SKF NU 1084 MA" ], "locale_variants": {} }, { "sku": "NU1092-MA", "brand": "SKF", "manufacturer_designation": "SKF NU 1092 MA", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 460, "D_mm": 680, "B_mm": 100, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 1650, "static_load_kN": 2850, "fatigue_load_limit_kN": 224, "max_rpm": 1200, "reference_speed_rpm": 950, "limiting_speed_rpm": 1200, "weight_g": 115000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NU 1092 MA is a single-row caged cylindrical roller bearing sized 460×680×100 mm — a dimension series 10 (extra-slim OD, normal width), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. The NU configuration means two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable; functionally the bearing is non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Selection arithmetic: C0/C ≈ 1.73 (2850 against 1650 kN), and the Pu figure 224 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 950 r/min thermal reference speed and 1,200 r/min mechanical limiting speed. Mounting: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. A 460 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "large rolling-mill drive trains", "marine propulsion line shafts", "heavy turbogenerator rotor supports", "mining hoist and winder shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1092, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 1092 MA and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 680 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 680 mm raceway.", "The 1650/2850 kN ratings are SKF catalogue 17000 (2018) values for the MA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1092-MA?", "a": "SKF NU 1092 MA is a single-row caged cylindrical roller bearing with 460 mm bore, 680 mm OD and 100 mm width per ISO 15. SKF lists C 1650 kN, C0 2850 kN, Pu 224 kN, reference speed 950 r/min and limiting speed 1,200 r/min, mass about 115000 g." }, { "q": "What does the NU designation and MA suffix mean?", "a": "The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU1092-MA take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU1092-MA compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU1092", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "NU1092", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU1092-MA", "SKF NU 1092 MA" ], "locale_variants": {} }, { "sku": "NU1096-MA", "brand": "SKF", "manufacturer_designation": "SKF NU 1096 MA", "series": "NU1000-series", "type": "cylindrical_roller", "d_mm": 480, "D_mm": 700, "B_mm": 100, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 1680, "static_load_kN": 3000, "fatigue_load_limit_kN": 232, "max_rpm": 1200, "reference_speed_rpm": 900, "limiting_speed_rpm": 1200, "weight_g": 130000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 480 mm shaft, SKF lists NU1096-MA as single-row caged cylindrical roller: 700 mm OD, 100 mm wide, Pu 232 kN, the catalogue lists 900 r/min thermal reference speed and 1,200 r/min mechanical limiting speed. The NU configuration means two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable; functionally the bearing is non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. The one-piece machined brass cage is reflected in the published speeds and temperature limits. Load-per-bore for the 480 mm seat is about 3.50 kN/mm, typical of dimension series 10 (extra-slim OD, normal width); use C0 3000 kN for static checks such as crane hook blocks standing under load. Assembly note: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. Heat steel rings inductively to max 120 °C.", "applications": [ "offshore drawworks shafts", "large rolling-mill drive trains", "marine propulsion line shafts", "heavy turbogenerator rotor supports" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 10 (extra-slim OD, normal width) envelope is shared with the N/NU/NJ/NUP executions of 1096, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 1096 MA and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 700 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 700 mm raceway.", "The 1680/3000 kN ratings are SKF catalogue 17000 (2018) values for the MA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1096-MA?", "a": "SKF NU 1096 MA is a single-row caged cylindrical roller bearing with 480 mm bore, 700 mm OD and 100 mm width per ISO 15. SKF lists C 1680 kN, C0 3000 kN, Pu 232 kN, reference speed 900 r/min and limiting speed 1,200 r/min, mass about 130000 g." }, { "q": "What does the NU designation and MA suffix mean?", "a": "The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU1096-MA take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU1096-MA compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU1096", "equiv_brand": "NTN", "level": "full", "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier." }, { "equiv_sku": "NU1096", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU1096-MA", "SKF NU 1096 MA" ], "locale_variants": {} }, { "sku": "NU12-500-MA", "brand": "SKF", "manufacturer_designation": "SKF NU 12/500 MA", "series": "NU1200-series", "type": "cylindrical_roller", "d_mm": 500, "D_mm": 920, "B_mm": 185, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 5280, "static_load_kN": 8500, "fatigue_load_limit_kN": 620, "max_rpm": 950, "reference_speed_rpm": 670, "limiting_speed_rpm": 950, "weight_g": 575000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NU 12/500 MA resolves to a 500×920×185 mm single-row caged cylindrical roller bearing (dimension series 12 (extra-slim OD, wide)); two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable. Reading the NU prefix: two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable. This makes the execution non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. With C 5280 kN and C0 8500 kN, size the bearing on the 500×920 mm ISO 15 envelope and check the 620 kN Pu against the equivalent-load floor; the catalogue lists 670 r/min thermal reference speed and 950 r/min mechanical limiting speed. Fit practice for NU12-500-MA: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "heavy turbogenerator rotor supports", "mining hoist and winder shafts", "offshore drawworks shafts", "large rolling-mill drive trains" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "electrical pitting on VFD-driven shafts without grounding protection" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 12 (extra-slim OD, wide) envelope is shared with the N/NU/NJ/NUP executions of 12/500, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 12/500 MA and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 185 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 185 mm-wide ring and concentrates load.", "The 5280/8500 kN ratings are SKF catalogue 17000 (2018) values for the MA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU12-500-MA?", "a": "SKF NU 12/500 MA is a single-row caged cylindrical roller bearing with 500 mm bore, 920 mm OD and 185 mm width per ISO 15. SKF lists C 5280 kN, C0 8500 kN, Pu 620 kN, reference speed 670 r/min and limiting speed 950 r/min, mass about 575000 g." }, { "q": "What does the NU designation and MA suffix mean?", "a": "The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU12-500-MA take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU12-500-MA compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU12", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU12-500-MA", "SKF NU 12/500 MA" ], "locale_variants": {} }, { "sku": "NU12-560-MA", "brand": "SKF", "manufacturer_designation": "SKF NU 12/560 MA", "series": "NU1200-series", "type": "cylindrical_roller", "d_mm": 560, "D_mm": 1030, "B_mm": 206, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 7210, "static_load_kN": 11200, "fatigue_load_limit_kN": 780, "max_rpm": 800, "reference_speed_rpm": 560, "limiting_speed_rpm": 800, "weight_g": 805000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NU 12/560 MA denotes a single-row caged cylindrical roller bearing on the ISO 15 560×1030×206 mm envelope, dimension series 12 (extra-slim OD, wide), with catalogue mass 805000 g. Structurally, the NU design has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable. In arrangement terms it is non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. Reading the order-string suffix MA: the basic (non-E) MA execution with a machined brass cage, standard for the larger and earlier-design sizes. Load-per-bore for the 560 mm seat is about 12.88 kN/mm, typical of dimension series 12 (extra-slim OD, wide); use C0 11200 kN for static checks such as crane hook blocks standing under load. Assembly note: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. Heat steel rings inductively to max 120 °C.", "applications": [ "offshore drawworks shafts", "large rolling-mill drive trains", "marine propulsion line shafts", "heavy turbogenerator rotor supports" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "fretting corrosion on a loose rotating shaft seat or in a vibratory stand-still" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 12 (extra-slim OD, wide) envelope is shared with the N/NU/NJ/NUP executions of 12/560, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 12/560 MA and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 206 mm-wide ring and concentrates load.", "The 7210/11200 kN ratings are SKF catalogue 17000 (2018) values for the MA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU12-560-MA?", "a": "SKF NU 12/560 MA is a single-row caged cylindrical roller bearing with 560 mm bore, 1030 mm OD and 206 mm width per ISO 15. SKF lists C 7210 kN, C0 11200 kN, Pu 780 kN, reference speed 560 r/min and limiting speed 800 r/min, mass about 805000 g." }, { "q": "What does the NU designation and MA suffix mean?", "a": "The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU12-560-MA take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU12-560-MA compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU12", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU12-560-MA", "SKF NU 12/560 MA" ], "locale_variants": {} }, { "sku": "NU1292-MA", "brand": "SKF", "manufacturer_designation": "SKF NU 1292 MA", "series": "NU1200-series", "type": "cylindrical_roller", "d_mm": 460, "D_mm": 830, "B_mm": 165, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 4180, "static_load_kN": 6800, "fatigue_load_limit_kN": 510, "max_rpm": 1100, "reference_speed_rpm": 750, "limiting_speed_rpm": 1100, "weight_g": 415000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NU 1292 MA resolves to a 460×830×165 mm single-row caged cylindrical roller bearing (dimension series 12 (extra-slim OD, wide)); two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable. Reading the NU prefix: two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable. This makes the execution non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. Reading the order-string suffix MA: the basic (non-E) MA execution with a machined brass cage, standard for the larger and earlier-design sizes. The radial section height is 185.0 mm and the catalogue mass 415000 g; at 4180 kN dynamic rating this is roughly 9.09 kN of C per millimetre of bore before application factors. Assembly note: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. Heat steel rings inductively to max 120 °C.", "applications": [ "marine propulsion line shafts", "heavy turbogenerator rotor supports", "mining hoist and winder shafts", "offshore drawworks shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 12 (extra-slim OD, wide) envelope is shared with the N/NU/NJ/NUP executions of 1292, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 1292 MA and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 165 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 165 mm-wide ring and concentrates load.", "The 4180/6800 kN ratings are SKF catalogue 17000 (2018) values for the MA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1292-MA?", "a": "SKF NU 1292 MA is a single-row caged cylindrical roller bearing with 460 mm bore, 830 mm OD and 165 mm width per ISO 15. SKF lists C 4180 kN, C0 6800 kN, Pu 510 kN, reference speed 750 r/min and limiting speed 1,100 r/min, mass about 415000 g." }, { "q": "What does the NU designation and MA suffix mean?", "a": "The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU1292-MA take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU1292-MA compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU1292", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU1292-MA", "SKF NU 1292 MA" ], "locale_variants": {} }, { "sku": "NU18-600-ECMA-HB1", "brand": "SKF", "manufacturer_designation": "SKF NU 18/600 ECMA/HB1", "series": "NU1800-series", "type": "cylindrical_roller", "d_mm": 600, "D_mm": 730, "B_mm": 60, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 897, "static_load_kN": 2080, "fatigue_load_limit_kN": 108, "max_rpm": 1000, "reference_speed_rpm": 800, "limiting_speed_rpm": 1000, "weight_g": 54000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU18-600-ECMA-HB1 is the 600 mm bore entry in the NU1800 range: a 600×730×60 mm single-row caged cylindrical roller bearing with a one-piece machined brass cage, rated C 897 kN / C0 2080 kN. The NU configuration means two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable; functionally the bearing is non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. Reading the order-string suffix ECMA/HB1: the basic execution supplied with a standard pressed-steel cage. With C 897 kN and C0 2080 kN, size the bearing on the 600×730 mm ISO 15 envelope and check the 108 kN Pu against the equivalent-load floor; the catalogue lists 800 r/min thermal reference speed and 1,000 r/min mechanical limiting speed. Fit practice for NU18-600-ECMA-HB1: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "heavy turbogenerator rotor supports", "mining hoist and winder shafts", "offshore drawworks shafts", "large rolling-mill drive trains" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 18 (ultra-slim section for large shafts) envelope is shared with the N/NU/NJ/NUP executions of 18/600, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 18/600 ECMA/HB1 and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 730 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 730 mm raceway.", "The 897/2080 kN ratings are SKF catalogue 17000 (2018) values for the ECMA/HB1 execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU18-600-ECMA-HB1?", "a": "SKF NU 18/600 ECMA/HB1 is a single-row caged cylindrical roller bearing with 600 mm bore, 730 mm OD and 60 mm width per ISO 15. SKF lists C 897 kN, C0 2080 kN, Pu 108 kN, reference speed 800 r/min and limiting speed 1,000 r/min, mass about 54000 g." }, { "q": "What does the NU designation and ECMA/HB1 suffix mean?", "a": "The plain designation (no cage suffix) identifies the basic execution supplied with a standard pressed-steel cage. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU18-600-ECMA-HB1 take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU18-600-ECMA-HB1 compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU18", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU18-600-ECMA-HB1", "SKF NU 18/600 ECMA/HB1" ], "locale_variants": {} }, { "sku": "NU18-800-ECMA", "brand": "SKF", "manufacturer_designation": "SKF NU 18/800 ECMA", "series": "NU1800-series", "type": "cylindrical_roller", "d_mm": 800, "D_mm": 980, "B_mm": 82, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 1720, "static_load_kN": 4150, "fatigue_load_limit_kN": 190, "max_rpm": 700, "reference_speed_rpm": 530, "limiting_speed_rpm": 700, "weight_g": 137000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NU 18/800 ECMA denotes a single-row caged cylindrical roller bearing on the ISO 15 800×980×82 mm envelope, dimension series 18 (ultra-slim section for large shafts), with catalogue mass 137000 g. Reading the NU prefix: two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable. This makes the execution non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. The ECMA suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. The radial section height is 90.0 mm and the catalogue mass 137000 g; at 1720 kN dynamic rating this is roughly 2.15 kN of C per millimetre of bore before application factors. Fit practice for NU18-800-ECMA: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "marine propulsion line shafts", "heavy turbogenerator rotor supports", "mining hoist and winder shafts", "offshore drawworks shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 18 (ultra-slim section for large shafts) envelope is shared with the N/NU/NJ/NUP executions of 18/800, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 18/800 ECMA and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 82 mm-wide ring and concentrates load.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 82 mm-wide ring and concentrates load.", "The 1720/4150 kN ratings are SKF catalogue 17000 (2018) values for the ECMA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU18-800-ECMA?", "a": "SKF NU 18/800 ECMA is a single-row caged cylindrical roller bearing with 800 mm bore, 980 mm OD and 82 mm width per ISO 15. SKF lists C 1720 kN, C0 4150 kN, Pu 190 kN, reference speed 530 r/min and limiting speed 700 r/min, mass about 137000 g." }, { "q": "What does the NU designation and ECMA suffix mean?", "a": "The ECMA suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU18-800-ECMA take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU18-800-ECMA compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU18", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU18-800-ECMA", "SKF NU 18/800 ECMA" ], "locale_variants": {} }, { "sku": "NU18-900-ECMA", "brand": "SKF", "manufacturer_designation": "SKF NU 18/900 ECMA", "series": "NU1800-series", "type": "cylindrical_roller", "d_mm": 900, "D_mm": 1090, "B_mm": 85, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 1980, "static_load_kN": 4900, "fatigue_load_limit_kN": 240, "max_rpm": 600, "reference_speed_rpm": 450, "limiting_speed_rpm": 600, "weight_g": 169000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 900 mm shaft, SKF lists NU18-900-ECMA as single-row caged cylindrical roller: 1090 mm OD, 85 mm wide, Pu 240 kN, the catalogue lists 450 r/min thermal reference speed and 600 r/min mechanical limiting speed. The NU configuration means two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable; functionally the bearing is non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. The ECMA suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Selection arithmetic: C0/C ≈ 2.47 (4900 against 1980 kN), and the Pu figure 240 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 450 r/min thermal reference speed and 600 r/min mechanical limiting speed. Assembly note: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. Heat steel rings inductively to max 120 °C.", "applications": [ "large rolling-mill drive trains", "marine propulsion line shafts", "heavy turbogenerator rotor supports", "mining hoist and winder shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 18 (ultra-slim section for large shafts) envelope is shared with the N/NU/NJ/NUP executions of 18/900, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 18/900 ECMA and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 1090 mm raceway.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 1980/4900 kN ratings are SKF catalogue 17000 (2018) values for the ECMA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU18-900-ECMA?", "a": "SKF NU 18/900 ECMA is a single-row caged cylindrical roller bearing with 900 mm bore, 1090 mm OD and 85 mm width per ISO 15. SKF lists C 1980 kN, C0 4900 kN, Pu 240 kN, reference speed 450 r/min and limiting speed 600 r/min, mass about 169000 g." }, { "q": "What does the NU designation and ECMA suffix mean?", "a": "The ECMA suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU18-900-ECMA take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU18-900-ECMA compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU18", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU18-900-ECMA", "SKF NU 18/900 ECMA" ], "locale_variants": {} }, { "sku": "NU1876-ECMP", "brand": "SKF", "manufacturer_designation": "SKF NU 1876 ECMP", "series": "NU1800-series", "type": "cylindrical_roller", "d_mm": 380, "D_mm": 480, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 561, "static_load_kN": 1120, "fatigue_load_limit_kN": 98, "max_rpm": 2000, "reference_speed_rpm": 1300, "limiting_speed_rpm": 2000, "weight_g": 20000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NU 1876 ECMP resolves to a 380×480×46 mm single-row caged cylindrical roller bearing (dimension series 18 (ultra-slim section for large shafts)); two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable. The NU configuration means two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable; functionally the bearing is non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. Reading the order-string suffix ECMP: the E-design ECMP execution with a one-piece machined brass cage for higher-temperature, higher-speed continuous duty. The radial section height is 50.0 mm and the catalogue mass 20000 g; at 561 kN dynamic rating this is roughly 1.48 kN of C per millimetre of bore before application factors. Assembly note: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. Heat steel rings inductively to max 120 °C.", "applications": [ "marine propulsion line shafts", "heavy turbogenerator rotor supports", "mining hoist and winder shafts", "offshore drawworks shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "edge loading from shaft deflection beyond the bearing alignment limit (≈ 3-4 minutes of arc for single-row CRB)" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 18 (ultra-slim section for large shafts) envelope is shared with the N/NU/NJ/NUP executions of 1876, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 1876 ECMP and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 480 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 46 mm-wide ring and concentrates load.", "The 561/1120 kN ratings are SKF catalogue 17000 (2018) values for the ECMP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1876-ECMP?", "a": "SKF NU 1876 ECMP is a single-row caged cylindrical roller bearing with 380 mm bore, 480 mm OD and 46 mm width per ISO 15. SKF lists C 561 kN, C0 1120 kN, Pu 98 kN, reference speed 1,300 r/min and limiting speed 2,000 r/min, mass about 20000 g." }, { "q": "What does the NU designation and ECMP suffix mean?", "a": "The ECMP suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU1876-ECMP take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU1876-ECMP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ1876-ECMP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 380×480×46 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU1876-ECMP", "SKF NU 1876 ECMP" ], "locale_variants": {} }, { "sku": "NU1880-MP", "brand": "SKF", "manufacturer_designation": "SKF NU 1880 MP", "series": "NU1800-series", "type": "cylindrical_roller", "d_mm": 400, "D_mm": 500, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 572, "static_load_kN": 1180, "fatigue_load_limit_kN": 100, "max_rpm": 1900, "reference_speed_rpm": 1300, "limiting_speed_rpm": 1900, "weight_g": 21500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NU 1880 MP resolves to a 400×500×46 mm single-row caged cylindrical roller bearing (dimension series 18 (ultra-slim section for large shafts)); two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable. The NU configuration means two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable; functionally the bearing is non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. The MP suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. The one-piece machined brass cage is reflected in the published speeds and temperature limits. The radial section height is 50.0 mm and the catalogue mass 21500 g; at 572 kN dynamic rating this is roughly 1.43 kN of C per millimetre of bore before application factors. Assembly note: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. Heat steel rings inductively to max 120 °C.", "applications": [ "marine propulsion line shafts", "heavy turbogenerator rotor supports", "mining hoist and winder shafts", "offshore drawworks shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 18 (ultra-slim section for large shafts) envelope is shared with the N/NU/NJ/NUP executions of 1880, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 1880 MP and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 500 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 500 mm raceway.", "The 572/1180 kN ratings are SKF catalogue 17000 (2018) values for the MP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1880-MP?", "a": "SKF NU 1880 MP is a single-row caged cylindrical roller bearing with 400 mm bore, 500 mm OD and 46 mm width per ISO 15. SKF lists C 572 kN, C0 1180 kN, Pu 100 kN, reference speed 1,300 r/min and limiting speed 1,900 r/min, mass about 21500 g." }, { "q": "What does the NU designation and MP suffix mean?", "a": "The MP suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU1880-MP take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU1880-MP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NJ1880-MP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 400×500×46 mm and equivalent catalogue ratings; the NJ execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." }, { "equiv_sku": "NUP1880-MP", "equiv_brand": "SKF", "level": "full", "note": "Same ISO 15 envelope 400×500×46 mm and equivalent catalogue ratings; the NUP execution differs in flange/retaining-ring configuration — boundary-dimension interchangeable, but axial-locating behaviour is not identical." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU1880-MP", "SKF NU 1880 MP" ], "locale_variants": {} }, { "sku": "NU1884-MP", "brand": "SKF", "manufacturer_designation": "SKF NU 1884 MP", "series": "NU1800-series", "type": "cylindrical_roller", "d_mm": 420, "D_mm": 520, "B_mm": 46, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 572, "static_load_kN": 1200, "fatigue_load_limit_kN": 102, "max_rpm": 1800, "reference_speed_rpm": 1200, "limiting_speed_rpm": 1800, "weight_g": 22000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "In SKF catalogue PUB BU/P1 17000, SKF NU 1884 MP denotes a single-row caged cylindrical roller bearing on the ISO 15 420×520×46 mm envelope, dimension series 18 (ultra-slim section for large shafts), with catalogue mass 22000 g. The NU configuration means two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable; functionally the bearing is non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. Reading the order-string suffix MP: the basic (non-E) MP execution with a machined brass cage, standard for the larger and earlier-design sizes. Selection arithmetic: C0/C ≈ 2.10 (1200 against 572 kN), and the Pu figure 102 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 1,200 r/min thermal reference speed and 1,800 r/min mechanical limiting speed. Fit practice for NU1884-MP: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "large rolling-mill drive trains", "marine propulsion line shafts", "heavy turbogenerator rotor supports", "mining hoist and winder shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 18 (ultra-slim section for large shafts) envelope is shared with the N/NU/NJ/NUP executions of 1884, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 1884 MP and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 520 mm raceway.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 520 mm raceway.", "The 572/1200 kN ratings are SKF catalogue 17000 (2018) values for the MP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1884-MP?", "a": "SKF NU 1884 MP is a single-row caged cylindrical roller bearing with 420 mm bore, 520 mm OD and 46 mm width per ISO 15. SKF lists C 572 kN, C0 1200 kN, Pu 102 kN, reference speed 1,200 r/min and limiting speed 1,800 r/min, mass about 22000 g." }, { "q": "What does the NU designation and MP suffix mean?", "a": "The MP suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU1884-MP take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU1884-MP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU1884", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU1884-MP", "SKF NU 1884 MP" ], "locale_variants": {} }, { "sku": "NU19-630-ECMA-HB1", "brand": "SKF", "manufacturer_designation": "SKF NU 19/630 ECMA/HB1", "series": "NU1900-series", "type": "cylindrical_roller", "d_mm": 630, "D_mm": 850, "B_mm": 100, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 2240, "static_load_kN": 4400, "fatigue_load_limit_kN": 315, "max_rpm": 900, "reference_speed_rpm": 700, "limiting_speed_rpm": 900, "weight_g": 168000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 630 mm shaft, SKF lists NU19-630-ECMA-HB1 as single-row caged cylindrical roller: 850 mm OD, 100 mm wide, Pu 315 kN, the catalogue lists 700 r/min thermal reference speed and 900 r/min mechanical limiting speed. Structurally, the NU design has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable. In arrangement terms it is non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. Reading the order-string suffix ECMA/HB1: the basic execution supplied with a standard pressed-steel cage. The radial section height is 110.0 mm and the catalogue mass 168000 g; at 2240 kN dynamic rating this is roughly 3.56 kN of C per millimetre of bore before application factors. Fit practice for NU19-630-ECMA-HB1: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "marine propulsion line shafts", "heavy turbogenerator rotor supports", "mining hoist and winder shafts", "offshore drawworks shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "brinelling from static overload or impact during handling and mounting" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 19 (ultra-slim section for large shafts) envelope is shared with the N/NU/NJ/NUP executions of 19/630, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 19/630 ECMA/HB1 and do not substitute rib styles without checking the shaft locating scheme.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 850 mm raceway.", "The 2240/4400 kN ratings are SKF catalogue 17000 (2018) values for the ECMA/HB1 execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU19-630-ECMA-HB1?", "a": "SKF NU 19/630 ECMA/HB1 is a single-row caged cylindrical roller bearing with 630 mm bore, 850 mm OD and 100 mm width per ISO 15. SKF lists C 2240 kN, C0 4400 kN, Pu 315 kN, reference speed 700 r/min and limiting speed 900 r/min, mass about 168000 g." }, { "q": "What does the NU designation and ECMA/HB1 suffix mean?", "a": "The plain designation (no cage suffix) identifies the basic execution supplied with a standard pressed-steel cage. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU19-630-ECMA-HB1 take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU19-630-ECMA-HB1 compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU19", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU19-630-ECMA-HB1", "SKF NU 19/630 ECMA/HB1" ], "locale_variants": {} }, { "sku": "NU1964-ECMA", "brand": "SKF", "manufacturer_designation": "SKF NU 1964 ECMA", "series": "NU1900-series", "type": "cylindrical_roller", "d_mm": 320, "D_mm": 440, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 693, "static_load_kN": 1200, "fatigue_load_limit_kN": 110, "max_rpm": 2000, "reference_speed_rpm": 1500, "limiting_speed_rpm": 2000, "weight_g": 26000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 320 mm shaft, SKF lists NU1964-ECMA as single-row caged cylindrical roller: 440 mm OD, 56 mm wide, Pu 110 kN, the catalogue lists 1,500 r/min thermal reference speed and 2,000 r/min mechanical limiting speed. Reading the NU prefix: two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable. This makes the execution non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. Reading the order-string suffix ECMA: the E-design ECMA execution with a one-piece machined brass cage for higher-temperature, higher-speed continuous duty. With C 693 kN and C0 1200 kN, size the bearing on the 320×440 mm ISO 15 envelope and check the 110 kN Pu against the equivalent-load floor; the catalogue lists 1,500 r/min thermal reference speed and 2,000 r/min mechanical limiting speed. Fit practice for NU1964-ECMA: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "heavy turbogenerator rotor supports", "mining hoist and winder shafts", "offshore drawworks shafts", "large rolling-mill drive trains" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 19 (ultra-slim section for large shafts) envelope is shared with the N/NU/NJ/NUP executions of 1964, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 1964 ECMA and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 56 mm-wide ring and concentrates load.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 440 mm raceway.", "The 693/1200 kN ratings are SKF catalogue 17000 (2018) values for the ECMA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1964-ECMA?", "a": "SKF NU 1964 ECMA is a single-row caged cylindrical roller bearing with 320 mm bore, 440 mm OD and 56 mm width per ISO 15. SKF lists C 693 kN, C0 1200 kN, Pu 110 kN, reference speed 1,500 r/min and limiting speed 2,000 r/min, mass about 26000 g." }, { "q": "What does the NU designation and ECMA suffix mean?", "a": "The ECMA suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU1964-ECMA take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU1964-ECMA compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU1964", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU1964-ECMA", "SKF NU 1964 ECMA" ], "locale_variants": {} }, { "sku": "NU1968-ECMA", "brand": "SKF", "manufacturer_designation": "SKF NU 1968 ECMA", "series": "NU1900-series", "type": "cylindrical_roller", "d_mm": 340, "D_mm": 460, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 682, "static_load_kN": 1200, "fatigue_load_limit_kN": 108, "max_rpm": 1900, "reference_speed_rpm": 1400, "limiting_speed_rpm": 1900, "weight_g": 27500, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "For a 340 mm shaft, SKF lists NU1968-ECMA as single-row caged cylindrical roller: 460 mm OD, 56 mm wide, Pu 108 kN, the catalogue lists 1,400 r/min thermal reference speed and 1,900 r/min mechanical limiting speed. The NU configuration means two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable; functionally the bearing is non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. The ECMA suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Selection arithmetic: C0/C ≈ 1.76 (1200 against 682 kN), and the Pu figure 108 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 1,400 r/min thermal reference speed and 1,900 r/min mechanical limiting speed. Fit practice for NU1968-ECMA: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. Single-row cylindrical rollers tolerate only about 3–4 minutes of arc misalignment, so verify shaft and housing alignment.", "applications": [ "large rolling-mill drive trains", "marine propulsion line shafts", "heavy turbogenerator rotor supports", "mining hoist and winder shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "roller-end scoring from inadequate oil flow in the roller-raceway contact", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 19 (ultra-slim section for large shafts) envelope is shared with the N/NU/NJ/NUP executions of 1968, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 1968 ECMA and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 460 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 56 mm-wide ring and concentrates load.", "The 682/1200 kN ratings are SKF catalogue 17000 (2018) values for the ECMA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1968-ECMA?", "a": "SKF NU 1968 ECMA is a single-row caged cylindrical roller bearing with 340 mm bore, 460 mm OD and 56 mm width per ISO 15. SKF lists C 682 kN, C0 1200 kN, Pu 108 kN, reference speed 1,400 r/min and limiting speed 1,900 r/min, mass about 27500 g." }, { "q": "What does the NU designation and ECMA suffix mean?", "a": "The ECMA suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU1968-ECMA take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU1968-ECMA compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU1968", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU1968-ECMA", "SKF NU 1968 ECMA" ], "locale_variants": {} }, { "sku": "NU1972-ECMP", "brand": "SKF", "manufacturer_designation": "SKF NU 1972 ECMP", "series": "NU1900-series", "type": "cylindrical_roller", "d_mm": 360, "D_mm": 480, "B_mm": 56, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 781, "static_load_kN": 1460, "fatigue_load_limit_kN": 129, "max_rpm": 2000, "reference_speed_rpm": 1400, "limiting_speed_rpm": 2000, "weight_g": 29000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "SKF NU 1972 ECMP is a single-row caged cylindrical roller bearing sized 360×480×56 mm — a dimension series 19 (ultra-slim section for large shafts), listed in SKF catalogue PUB BU/P1 17000 ch. 6.1. The NU configuration means two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable; functionally the bearing is non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. The ECMP suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. The one-piece machined brass cage is reflected in the published speeds and temperature limits. With C 781 kN and C0 1460 kN, size the bearing on the 360×480 mm ISO 15 envelope and check the 129 kN Pu against the equivalent-load floor; the catalogue lists 1,400 r/min thermal reference speed and 2,000 r/min mechanical limiting speed. Mounting: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. A 360 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "heavy turbogenerator rotor supports", "mining hoist and winder shafts", "offshore drawworks shafts", "large rolling-mill drive trains" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "smearing (microwelding) on roller surfaces during skid starts with insufficient minimum load" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 19 (ultra-slim section for large shafts) envelope is shared with the N/NU/NJ/NUP executions of 1972, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 1972 ECMP and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 480 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 56 mm-wide ring and concentrates load.", "The 781/1460 kN ratings are SKF catalogue 17000 (2018) values for the ECMP execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1972-ECMP?", "a": "SKF NU 1972 ECMP is a single-row caged cylindrical roller bearing with 360 mm bore, 480 mm OD and 56 mm width per ISO 15. SKF lists C 781 kN, C0 1460 kN, Pu 129 kN, reference speed 1,400 r/min and limiting speed 2,000 r/min, mass about 29000 g." }, { "q": "What does the NU designation and ECMP suffix mean?", "a": "The ECMP suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU1972-ECMP take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU1972-ECMP compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU1972", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU1972-ECMP", "SKF NU 1972 ECMP" ], "locale_variants": {} }, { "sku": "NU1988-MA", "brand": "SKF", "manufacturer_designation": "SKF NU 1988 MA", "series": "NU1900-series", "type": "cylindrical_roller", "d_mm": 440, "D_mm": 600, "B_mm": 74, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 1060, "static_load_kN": 2000, "fatigue_load_limit_kN": 170, "max_rpm": 1400, "reference_speed_rpm": 1100, "limiting_speed_rpm": 1400, "weight_g": 53000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "NU1988-MA is the 440 mm bore entry in the NU1900 range: a 440×600×74 mm single-row caged cylindrical roller bearing with a one-piece machined brass cage, rated C 1060 kN / C0 2000 kN. The NU configuration means two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable; functionally the bearing is non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. The one-piece machined brass cage is reflected in the published speeds and temperature limits. Selection arithmetic: C0/C ≈ 1.89 (2000 against 1060 kN), and the Pu figure 170 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 1,100 r/min thermal reference speed and 1,400 r/min mechanical limiting speed. Mounting: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. A 440 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "large rolling-mill drive trains", "marine propulsion line shafts", "heavy turbogenerator rotor supports", "mining hoist and winder shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "polymer cage cracking or softening after sustained running above 120 °C or with incompatible lubricant", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 19 (ultra-slim section for large shafts) envelope is shared with the N/NU/NJ/NUP executions of 1988, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 1988 MA and do not substitute rib styles without checking the shaft locating scheme.", "Press-fit force goes through ring faces only; driving a ring home through the rollers brinells the 600 mm raceway.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 74 mm-wide ring and concentrates load.", "The 1060/2000 kN ratings are SKF catalogue 17000 (2018) values for the MA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1988-MA?", "a": "SKF NU 1988 MA is a single-row caged cylindrical roller bearing with 440 mm bore, 600 mm OD and 74 mm width per ISO 15. SKF lists C 1060 kN, C0 2000 kN, Pu 170 kN, reference speed 1,100 r/min and limiting speed 1,400 r/min, mass about 53000 g." }, { "q": "What does the NU designation and MA suffix mean?", "a": "The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU1988-MA take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU1988-MA compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU1988", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU1988-MA", "SKF NU 1988 MA" ], "locale_variants": {} }, { "sku": "NU1996-MA", "brand": "SKF", "manufacturer_designation": "SKF NU 1996 MA", "series": "NU1900-series", "type": "cylindrical_roller", "d_mm": 480, "D_mm": 650, "B_mm": 78, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 1170, "static_load_kN": 2240, "fatigue_load_limit_kN": 183, "max_rpm": 1300, "reference_speed_rpm": 950, "limiting_speed_rpm": 1300, "weight_g": 76000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NU 1996 MA resolves to a 480×650×78 mm single-row caged cylindrical roller bearing (dimension series 19 (ultra-slim section for large shafts)); two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable. Reading the NU prefix: two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable. This makes the execution non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. Reading the order-string suffix MA: the basic (non-E) MA execution with a machined brass cage, standard for the larger and earlier-design sizes. With C 1170 kN and C0 2240 kN, size the bearing on the 480×650 mm ISO 15 envelope and check the 183 kN Pu against the equivalent-load floor; the catalogue lists 950 r/min thermal reference speed and 1,300 r/min mechanical limiting speed. Mounting: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. A 480 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "heavy turbogenerator rotor supports", "mining hoist and winder shafts", "offshore drawworks shafts", "large rolling-mill drive trains" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "hard-particle indentation of the raceway in unfiltered oil systems" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 19 (ultra-slim section for large shafts) envelope is shared with the N/NU/NJ/NUP executions of 1996, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 1996 MA and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 78 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 1170/2240 kN ratings are SKF catalogue 17000 (2018) values for the MA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU1996-MA?", "a": "SKF NU 1996 MA is a single-row caged cylindrical roller bearing with 480 mm bore, 650 mm OD and 78 mm width per ISO 15. SKF lists C 1170 kN, C0 2240 kN, Pu 183 kN, reference speed 950 r/min and limiting speed 1,300 r/min, mass about 76000 g." }, { "q": "What does the NU designation and MA suffix mean?", "a": "The MA suffix marks the basic (non-E) execution with a machined brass cage, the standard choice for the larger and earlier-design sizes. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU1996-MA take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU1996-MA compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU1996", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU1996-MA", "SKF NU 1996 MA" ], "locale_variants": {} }, { "sku": "NU20-500-ECMA", "brand": "SKF", "manufacturer_designation": "SKF NU 20/500 ECMA", "series": "NU2000-series", "type": "cylindrical_roller", "d_mm": 500, "D_mm": 720, "B_mm": 128, "material": "GCr15", "seal_type": "open", "clearance": "CN", "tolerance_class": "P0", "cage_type": "brass", "dynamic_load_kN": 2920, "static_load_kN": 5850, "fatigue_load_limit_kN": 440, "max_rpm": 1100, "reference_speed_rpm": 750, "limiting_speed_rpm": 1100, "weight_g": 180000, "weight_estimated": false, "temp_min_c": -40, "temp_max_c": 120, "standard": "ISO 15", "naming_rule_text": "Ordering number SKF NU 20/500 ECMA resolves to a 500×720×128 mm single-row caged cylindrical roller bearing (dimension series 20 (light section for large shafts)); two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable. Reading the NU prefix: two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable. This makes the execution non-locating: the inner ring assembly can float axially in both directions and the bearing cannot support axial load. Reading the order-string suffix ECMA: the E-design ECMA execution with a one-piece machined brass cage for higher-temperature, higher-speed continuous duty. Selection arithmetic: C0/C ≈ 2.00 (5850 against 2920 kN), and the Pu figure 440 kN is the fatigue load-limit floor for the SKF life equation; the catalogue lists 750 r/min thermal reference speed and 1,100 r/min mechanical limiting speed. Mounting: fit the inner ring and roller assembly onto the shaft and the outer ring into the housing independently; thermal expansion is absorbed by axial float, so do not trap the inner ring between shaft shoulders. A 500 mm seat normally takes a m6 interference with an H6 housing bore when the inner ring rotates.", "applications": [ "large rolling-mill drive trains", "marine propulsion line shafts", "heavy turbogenerator rotor supports", "mining hoist and winder shafts" ], "failure_modes": [ "inner-ring raceway spalling from overload or contamination in the line-contact hertz zone", "outer-ring raceway fatigue after extended service at loads above the catalogue L10 rating", "cage pocket wear from roller skew at light load", "cage pocket wear from roller skidding at insufficient radial load or during start-up before oil film build-up", "surface distress (micro-pitting) when the EHL film falls below the composite roughness at high specific load", "edge-loading fatigue after shaft deflection beyond the 3–4 minute alignment limit", "false brinelling on standby machines exposed to external vibration" ], "pitfalls": [ "Do not use a NU bearing where axial load must be carried — the design carries radial load only", "The dimension series 20 (light section for large shafts) envelope is shared with the N/NU/NJ/NUP executions of 20/500, but flange configuration and axial-locating behaviour differ — quote the full SKF NU 20/500 ECMA and do not substitute rib styles without checking the shaft locating scheme.", "Shaft and housing fillets must clear the bearing chamfers; an oversized radius tilts the 128 mm-wide ring and concentrates load.", "Catalogue reference and limiting speeds are different criteria: observe the mechanical ceiling even when thermal calculations allow more.", "The 2920/5850 kN ratings are SKF catalogue 17000 (2018) values for the ECMA execution; re-verify against the current catalogue for critical drives and keep the catalogue version with the specification." ], "faq": [ { "q": "What are the dimensions and catalogue data of NU20-500-ECMA?", "a": "SKF NU 20/500 ECMA is a single-row caged cylindrical roller bearing with 500 mm bore, 720 mm OD and 128 mm width per ISO 15. SKF lists C 2920 kN, C0 5850 kN, Pu 440 kN, reference speed 750 r/min and limiting speed 1,100 r/min, mass about 180000 g." }, { "q": "What does the NU designation and ECMA suffix mean?", "a": "The ECMA suffix denotes the E-design execution with a one-piece machined brass cage for higher-temperature and higher-speed continuous duty. Structurally this execution has two integral flanges on the outer ring and no flanges on the inner ring, so the inner ring together with the roller set is separable." }, { "q": "Can NU20-500-ECMA take axial load and locate the shaft?", "a": "No — the inner ring has no flanges, so the NU bearing is non-locating and carries radial load only; use NJ (one direction), NUP (both directions) or a paired thrust bearing for axial duty." }, { "q": "How does NU20-500-ECMA compare with the other executions in the same envelope?", "a": "The N/NU/NJ/NUP executions share the ISO 15 envelope and load ratings but differ in flange arrangement and axial-locating behaviour; quote the exact order number." }, { "q": "What limits the service life of this bearing most often?", "a": "Line-contact fatigue above the L10 rating, cage wear at light loads and high temperatures, and edge loading from misalignment beyond about 3–4 minutes of arc are the typical failure drivers." } ], "cross_ref": [ { "equiv_sku": "NU20", "equiv_brand": "ISO 15", "level": "full", "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier." } ], "source_ref": "https://www.skf.com/group/products/rolling-bearings/roller-bearings/cylindrical-roller-bearings", "catalog_ver": "SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings", "extracted_at": "2026-09-26", "last_verified": "2026-09-26", "confidence_score": 0.7, "status": "published", "aliases": [ "NU20-500-ECMA", "SKF NU 20/500 ECMA" ], "locale_variants": {} } ]